How to check iOS version

Question

I want to check if the iOS version of the device is greater than 3 1 3 I tried things like     UIDevice currentDevice  systemVersion floatValue    but it does not work  I just want a   if  version  gt  3 1 3        How can I achieve this

User · Answer

Preferred Approach  In Swift 2 0 Apple added availability checking using a far more convenient syntax  Read more here   Now you can check the OS version with a cleaner syntax   if  available iOS 9              Then we are on iOS 9   else          iOS 8 or earlier     This is the preferred over checking respondsToSelector etc  What s New In Swift   Now the compiler will always warn you if you aren t guarding your code properly     Pre Swift 2 0  New in iOS 8 is NSProcessInfo allowing for better semantic versioning checks   Deploying on iOS 8 and greater     For minimum deployment targets of iOS 8 0 or above  use NSProcessInfo   operatingSystemVersion or isOperatingSystemAtLeastVersion     This would yield the following   let minimumVersion   NSOperatingSystemVersion majorVersion  8  minorVersion  1  patchVersion  2  if NSProcessInfo   isOperatingSystemAtLeastVersion minimumVersion          current version is  gt    8 1 2    else         current version is  lt   8 1 2      Deploying on iOS 7     For minimum deployment targets of iOS 7 1 or below  use compare with   NSStringCompareOptions NumericSearch on UIDevice systemVersion    This would yield   let minimumVersionString    3 1 3  let versionComparison   UIDevice currentDevice   systemVersion compare minimumVersionString  options   NumericSearch  switch versionComparison       case  OrderedSame   OrderedDescending            current version is  gt    3 1 3          break     case  OrderedAscending            current version is  lt   3 1 3          fallthrough     default          break      More reading at NSHipster

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Starting Xcode 9  in Objective-C     if   available iOS 11               iOS 11  or newer  ObjC code   else          iOS 10 or older code     Starting Xcode 7  in Swift     if  available iOS 11              iOS 11  or newer  Swift code   else          iOS 10 or older code       For the version  you can specify the MAJOR  the MINOR or the PATCH  see http   semver org  for definitions   Examples    iOS 11 and iOS 11 0 are the same minimal version iOS 10  iOS 10 3  iOS 10 3 1 are different minimal versions   You can input values for any of those systems    iOS  macOS  watchOS  tvOS   Real case example taken from one of my pods   if  available iOS 10 0  tvOS 10 0              iOS 10  and tvOS 10  Swift code   else          iOS 9 and tvOS 9 older code       documentation

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There are version like 7 0 or 6 0 3  so we can simply convert version into numerics to compare  if version is like 7 0  simply append another   0  to it and then take its numeric value    int version   NSString  iosVersion   UIDevice currentDevice  systemVersion    NSArray  components  iosVersion componentsSeparatedByString         if   components count   2        iosVersion  NSString stringWithFormat      0  iosVersion        iosVersion  iosVersion stringByReplacingOccurrencesOfString      withString        version  iosVersion integerValue     For 6 0 0    if  version  600           Do something       for 7 0   if  version  700          Do something

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Try   NSComparisonResult order     UIDevice currentDevice  systemVersion compare    3 1 3  options  NSNumericSearch   if  order    NSOrderedSame    order    NSOrderedDescending           OS version  gt   3 1 3   else          OS version  lt  3 1 3

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BOOL doesSystemVersionMeetRequirement  NSString   minRequirement      eg  NSString  reqSysVer     4 0       NSString  currSysVer     UIDevice currentDevice  systemVersion      if   currSysVer compare minRequirement options NSNumericSearch     NSOrderedAscending          return YES     else      return NO

User · Answer

As suggested by the official Apple docs  you can use the NSFoundationVersionNumber  from the NSObjCRuntime h header file   if  floor NSFoundationVersionNumber   gt  NSFoundationVersionNumber iOS 6 1           here you go with iOS 7

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I know this is an old question  but someone should have mentioned the compile-time macros in Availability h  All of the other methods here are runtime solutions  and will not work in a header file  class category  or ivar definition    For these situations  use    if   IPHONE OS VERSION MAX ALLOWED  gt     IPHONE 6 0      iOS 6  code here  else      Pre iOS 6 code here  endif   h t this answer

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System Versioning Preprocessor Macros        define SYSTEM VERSION EQUAL TO v                       UIDevice currentDevice  systemVersion  compare v options NSNumericSearch     NSOrderedSame   define SYSTEM VERSION GREATER THAN v                   UIDevice currentDevice  systemVersion  compare v options NSNumericSearch     NSOrderedDescending   define SYSTEM VERSION GREATER THAN OR EQUAL TO v       UIDevice currentDevice  systemVersion  compare v options NSNumericSearch     NSOrderedAscending   define SYSTEM VERSION LESS THAN v                      UIDevice currentDevice  systemVersion  compare v options NSNumericSearch     NSOrderedAscending   define SYSTEM VERSION LESS THAN OR EQUAL TO v          UIDevice currentDevice  systemVersion  compare v options NSNumericSearch     NSOrderedDescending          Usage       if  SYSTEM VERSION LESS THAN   4 0                 if  SYSTEM VERSION GREATER THAN OR EQUAL TO   3 1 1

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This is used to check for compatible SDK version in Xcode  this is if you have a large team with different versions of Xcode or multiple projects supporting different SDKs that share the same code    if   IPHONE OS VERSION MAX ALLOWED  gt   80000     programming in iOS 8  SDK here  else     programming in lower than iOS 8 here     endif   What you really want is to check the iOS version on the device  You can do that with this   if     UIDevice currentDevice  systemVersion  floatValue   lt  8 0        older than iOS 8 code here   else       iOS 8 specific code here     Swift version   if let version   Float UIDevice current systemVersion   version  lt  9 3         add lower than 9 3 code here   else         add 9 3 and above code here     Current versions of swift should be using this   if  available iOS 12             iOS 12 specific code here   else         older than iOS 12 code here

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There are a few problems with the two popular answers    Comparing strings using NSNumericSearch sometimes has unintuitive results  the SYSTEM VERSION   macros all suffer from this       10 0  compare   10  options NSNumericSearch     returns NSOrderedDescending instead of NSOrderedSame   FIX  Normalize your strings first and then perform the comparisons  could be annoying trying to get both strings in identical formats  Using the foundation framework version symbols is not possible when checking future releases  NSFoundationVersionNumber iOS 6 1    does not exist in iOS 5 SDK   FIX  Perform two separate tests to ensure the symbol exists AND THEN compare symbols  However another here  The foundation framwork versions symbols are not unique to iOS versions  Multiple iOS releases can have the same framework version   9 2  amp  9 3 are both 1242 12 8 3  amp  8 4 are both 1144 17   FIX  I believe this issue is unresolvable     To resolve these issues  the following method treats version number strings as base-10000 numbers  each major minor patch component is an individual digit  and performs a base conversion to decimal for easy comparison using integer operators    Two other methods were added for conveniently comparing iOS version strings and for comparing strings with arbitrary number of components      SInt64 integerFromVersionString  NSString   versionString withComponentCount  NSUInteger componentCount                 performs base conversion from a version string to a decimal value  the version string is interpreted as        a base-10000 number  where each component is an individual digit  this makes it simple to use integer        operations for comparing versions  for example  with componentCount   4                   version  5 9 22 1    5 1000 3   9 1000 2   22 1000 1   1 1000 0   5000900220001           and          version  6 0 0 0    6 1000 3   0 1000 2   0 1000 1   0 1000 1   6000000000000           and          version  6    6 1000 3   0 1000 2   0 1000 1   0 1000 1   6000000000000               then the integer comparisons hold true as you would expect                   5 9 22 1   lt   6 0 0 0     true           6 0 0 0      6           true             static NSCharacterSet  nonDecimalDigitCharacter      static dispatch once t onceToken      dispatch once  amp onceToken                 don t allocate this charset every time the function is called             nonDecimalDigitCharacter     NSCharacterSet decimalDigitCharacterSet  invertedSet                    SInt64 base      10000     each component in the version string must be less than base     SInt64 result        0      SInt64 power         0          construct the decimal value left-to-right from the version string     for  NSString  component in  versionString componentsSeparatedByString                      if  NSNotFound     component rangeOfCharacterFromSet nonDecimalDigitCharacter  location                           one of the version components is not an integer  so bail out             result   -1              break                    result     component longLongValue     long long pow  double base   double  componentCount -   power               return result        SInt64 integerFromVersionString  NSString   versionString       return   self class  integerFromVersionString versionString                                withComponentCount   versionString componentsSeparatedByString       count          SInt64 integerFromiOSVersionString  NSString   versionString          iOS uses 3-component version string     return   self class  integerFromVersionString versionString                                withComponentCount 3       It s somewhat future-proof in that it supports many revision identifiers  through 4 digits  0-9999  change base to adjust this range  and can support an arbitrary number of components  Apple seems to use 3 components for now  e g  major minor patch   but this can be specified explicitly using the componentCount argument  Be sure your componentCount and base do not cause overflow  i e  ensure 2 63  gt   base componentCount   Usage example   NSString  currentVersion     UIDevice currentDevice  systemVersion   if   Util integerFromiOSVersionString currentVersion   gt    Util integerFromiOSVersionString   42          NSLog   we are in some horrible distant future where iOS still exists

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if  floor NSFoundationVersionNumber   gt  NSFoundationVersionNumber iOS 6 1               Your code here     Where of course  NSFoundationVersionNumber iOS 6 1 must be changed to by applicable for the iOS version you want to check  What I have now written will probably be used a lot when testing if a device is running iOS7 or a previous version

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As a variation of yasimturks solution  I defined one function and a few enum values instead of five macros  I find it more elegant  but that s a matter of taste   Usage   if  systemVersion LessThan    5 0           h file   typedef enum     LessThan    LessOrEqual    Equal    GreaterOrEqual    GreaterThan    NotEqual   Comparison   BOOL systemVersion Comparison test  NSString  version      m file   BOOL systemVersion Comparison test  NSString  version      NSComparisonResult result      UIDevice currentDevice  systemVersion  compare  version options  NSNumericSearch     switch  test        case LessThan        return result    NSOrderedAscending      case LessOrEqual     return result    NSOrderedDescending      case Equal           return result    NSOrderedSame      case GreaterOrEqual  return result    NSOrderedAscending      case GreaterThan     return result    NSOrderedDescending      case NotEqual        return result    NSOrderedSame          You should add your app s prefix to the names  especially to the Comparison type

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With Version class that is contained in nv-ios-version project  Apache License  Version 2 0   it is easy to get and compare iOS version  An example code below dumps the iOS version and checks whether the version is greater than or equal to 6 0      Get the system version of iOS at runtime  NSString  versionString     UIDevice currentDevice  systemVersion       Convert the version string to a Version instance  Version  version    Version versionWithString versionString       Dump the major  minor and micro version numbers  NSLog   version     d   d   d        version major  version minor  version micro       Check whether the version is greater than or equal to 6 0  if   version isGreaterThanOrEqualToMajor 6 minor 0            The iOS version is greater than or equal to 6 0        Another way to check whether iOS version is    greater than or equal to 6 0  if  6  lt   version major           The iOS version is greater than or equal to 6 0      Project Page  nv-ios-version TakahikoKawasaki nv-ios-version  Blog  Get and compare iOS version at runtime with Version class Get and compare iOS version at runtime with Version class

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define IsIOS8  NSFoundationVersionNumber  gt  NSFoundationVersionNumber iOS 7 1

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Here is a Swift version of yasirmturk macros  Hope it helps some peoples     MARK  System versionning  func SYSTEM VERSION EQUAL TO v  String  - gt  Bool       return UIDevice currentDevice   systemVersion compare v  options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedSame    func SYSTEM VERSION GREATER THAN v  String  - gt  Bool       return UIDevice currentDevice   systemVersion compare v  options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedDescending    func SYSTEM VERSION GREATER THAN OR EQUAL TO v  String  - gt  Bool       return UIDevice currentDevice   systemVersion compare v  options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedAscending    func SYSTEM VERSION LESS THAN v  String  - gt  Bool       return UIDevice currentDevice   systemVersion compare v  options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedAscending    func SYSTEM VERSION LESS THAN OR EQUAL TO v  String  - gt  Bool       return UIDevice currentDevice   systemVersion compare v  options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedDescending    let kIsIOS7  Bool   SYSTEM VERSION GREATER THAN OR EQUAL TO  7   let kIsIOS7 1  Bool   SYSTEM VERSION GREATER THAN OR EQUAL TO  7 1   let kIsIOS8  Bool   SYSTEM VERSION GREATER THAN OR EQUAL TO  8   let kIsIOS9  Bool   SYSTEM VERSION GREATER THAN OR EQUAL TO  9

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In general it s better to ask if an object can perform a given selector  rather than checking  a version number to decide if it must be present   When this is not an option  you do need to be a bit careful here because    5 0  compare   5  options NSNumericSearch  returns NSOrderedDescending which might well not be intended at all  I might expect NSOrderedSame here  This is at least a theoretical concern  one that is worth defending against in my opinion   Also worth considering is the possibility of a bad version input which can not reasonably be compared to  Apple supplies the three predefined constants NSOrderedAscending  NSOrderedSame and NSOrderedDescending but I can think of a use for some thing called NSOrderedUnordered in the event I can t compare two things and I want to return a value indicating this   What s more  it s not impossible that Apple will some day expand their three predefined constants to allow a variety of return values  making a comparison    NSOrderedAscending unwise   With this said  consider the following code   typedef enum  kSKOrderedNotOrdered   -2  kSKOrderedAscending   -1  kSKOrderedSame   0  kSKOrderedDescending   1  SKComparisonResult    interface SKComparator   NSObject    SKComparisonResult comparePointSeparatedVersionNumber  NSString   vOne withPointSeparatedVersionNumber  NSString   vTwo   end   implementation SKComparator    SKComparisonResult comparePointSeparatedVersionNumber  NSString   vOne withPointSeparatedVersionNumber  NSString   vTwo     if   vOne     vTwo     vOne length   lt  1     vTwo length   lt  1     vOne rangeOfString        location    NSNotFound         vTwo rangeOfString        location    NSNotFound        return SKOrderedNotOrdered        NSCharacterSet  numericalCharSet    NSCharacterSet characterSetWithCharactersInString    0123456789      NSString  vOneTrimmed    vOne stringByTrimmingCharactersInSet numericalCharSet     NSString  vTwoTrimmed    vTwo stringByTrimmingCharactersInSet numericalCharSet     if   vOneTrimmed length   gt  0     vTwoTrimmed length   gt  0        return SKOrderedNotOrdered        NSArray  vOneArray    vOne componentsSeparatedByString          NSArray  vTwoArray    vTwo componentsSeparatedByString          for  NSUInteger i   0  i  lt  MIN  vOneArray count    vTwoArray count    i          NSInteger vOneInt     vOneArray objectAtIndex i  intValue       NSInteger vTwoInt     vTwoArray objectAtIndex i  intValue       if  vOneInt  gt  vTwoInt          return kSKOrderedDescending        else if  vOneInt  lt  vTwoInt          return kSKOrderedAscending              if   vOneArray count   gt   vTwoArray count         for  NSUInteger i    vTwoArray count   i  lt   vOneArray count   i            if    vOneArray objectAtIndex i  intValue   gt  0            return kSKOrderedDescending                    else if   vOneArray count   lt   vTwoArray count         for  NSUInteger i    vOneArray count   i  lt   vTwoArray count   i            if    vTwoArray objectAtIndex i  intValue   gt  0            return kSKOrderedAscending                      return kSKOrderedSame     end

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Swift example that actually works   switch UIDevice currentDevice   systemVersion compare  8 0 0   options  NSStringCompareOptions NumericSearch    case  OrderedSame   OrderedDescending      println  iOS  gt   8 0   case  OrderedAscending      println  iOS  lt  8 0       Don t use NSProcessInfo cause it doesn t work under 8 0  so its pretty much useless until 2016

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define  kisiOS7     UIDevice currentDevice  systemVersion  floatValue   gt   7 0   if   kisiOS7                NSLog   iOS7 or greater      else              NSLog   Less than iOS7

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float deviceOSVersion      UIDevice currentDevice  systemVersion  floatValue   float versionToBeCompared   3 1 3     For Example in your case   if deviceOSVersion  lt  versionToBeCompared       Do whatever you need to do  Device version is lesser than 3 1 3 in your case  else       Device version should be either equal to the version you specified or above

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I always keep those in my Constants h file    define IS IPHONE5     UIScreen mainScreen  bounds  size height-568  NO YES    define IS OS 5 OR LATER        UIDevice currentDevice  systemVersion  floatValue   gt   5 0   define IS OS 6 OR LATER        UIDevice currentDevice  systemVersion  floatValue   gt   6 0   define IS OS 7 OR LATER        UIDevice currentDevice  systemVersion  floatValue   gt   7 0   define IS OS 8 OR LATER        UIDevice currentDevice  systemVersion  floatValue   gt   8 0

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New way to check the system version using the swift Forget   UIDevice currentDevice  systemVersion  and NSFoundationVersionNumber   We can use NSProcessInfo -isOperatingSystemAtLeastVersion       import Foundation       let yosemite   NSOperatingSystemVersion majorVersion  10  minorVersion  10  patchVersion  0       NSProcessInfo   isOperatingSystemAtLeastVersion yosemite     false

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My solution is add a utility method to your utilities class  hint hint  to parse the system version and manually compensate for float number ordering   Also  this code is rather simple  so I hope it helps some newbies  Simply pass in a target float  and get back a BOOL   Declare it in your shared class like this        BOOL  iOSMeetsOrExceedsVersion  float targetVersion    Call it like this    BOOL shouldBranch    SharedClass iOSMeetsOrExceedsVersion 5 0101         BOOL  iOSMeetsOrExceedsVersion  float targetVersion        Note  the incoming targetVersion should use 2 digits for each subVersion --   example 5 01 for v5 1  5 11 for v5 11  aka subversions above 9   5 0101 for v5 1 1  etc         Logic  as a string  system version may have more than 2 segments  example  5 1 1     so  a direct conversion to a float may return an invalid number    instead  parse each part directly  NSArray  sysVersion     UIDevice currentDevice  systemVersion componentsSeparatedByString        float floatVersion     sysVersion objectAtIndex 0  floatValue   if  sysVersion count  gt  1        NSString  subVersion    sysVersion objectAtIndex 1       if  subVersion length    1          floatVersion       sysVersion objectAtIndex 1  floatValue   0 01       else         floatVersion       sysVersion objectAtIndex 1  floatValue   0 10     if  sysVersion count  gt  2        NSString  subVersion    sysVersion objectAtIndex 2       if  subVersion length    1          floatVersion       sysVersion objectAtIndex 2  floatValue   0 0001       else         floatVersion       sysVersion objectAtIndex 2  floatValue   0 0010      if  floatVersion   gt   targetVersion       return TRUE      else return FALSE

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Try this  if     UIDevice currentDevice  systemVersion  floatValue   gt   7        do some work

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Add the Swift code below in your project and access information such as iOS version and device easily   class DeviceInfo  NSObject        struct ScreenSize               static let SCREEN WIDTH   UIScreen main bounds size width         static let SCREEN HEIGHT   UIScreen main bounds size height         static let SCREEN MAX LENGTH   max ScreenSize SCREEN WIDTH  ScreenSize SCREEN HEIGHT          static let SCREEN MIN LENGTH   min ScreenSize SCREEN WIDTH  ScreenSize SCREEN HEIGHT             struct DeviceType               static let IS IPHONE 4 OR LESS    UIDevice current userInterfaceIdiom     phone  amp  amp  ScreenSize SCREEN MAX LENGTH  lt  568 0         static let IS IPHONE 5   UIDevice current userInterfaceIdiom     phone  amp  amp  ScreenSize SCREEN MAX LENGTH    568 0         static let IS IPHONE 6   UIDevice current userInterfaceIdiom     phone  amp  amp  ScreenSize SCREEN MAX LENGTH  gt   667 0         static let IS IPHONE 6P   UIDevice current userInterfaceIdiom     phone  amp  amp  ScreenSize SCREEN MAX LENGTH    736 0         static let IS IPHONE X   UIDevice current userInterfaceIdiom     phone  amp  amp  ScreenSize SCREEN MAX LENGTH    812 0         static let IS IPAD        UIDevice current userInterfaceIdiom     pad  amp  amp  ScreenSize SCREEN MAX LENGTH    1024 0         static let IS IPAD PRO    UIDevice current userInterfaceIdiom     pad  amp  amp  ScreenSize SCREEN MAX LENGTH    1366 0            struct VersionType          static let SYS VERSION FLOAT    UIDevice current systemVersion as NSString  floatValue         static let iOS7    VersionType SYS VERSION FLOAT  lt  8 0  amp  amp  VersionType SYS VERSION FLOAT  gt   7 0          static let iOS8    VersionType SYS VERSION FLOAT  gt   8 0  amp  amp  VersionType SYS VERSION FLOAT  lt  9 0          static let iOS9    VersionType SYS VERSION FLOAT  gt   9 0  amp  amp  VersionType SYS VERSION FLOAT  lt  10 0          static let iOS10    VersionType SYS VERSION FLOAT  gt   9 0  amp  amp  VersionType SYS VERSION FLOAT  lt  11 0

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A more generic version in Obj-C   11  you could probably replace some of this stuff with the NSString C functions  but this is less verbose   This gives you two mechanisms   splitSystemVersion gives you an array of all the parts which is useful if you just want to switch on the major version  e g  switch  self splitSystemVersion  0    case 4  break  case 5  break        include  lt boost lexical cast hpp gt   -  std  vector lt int gt   splitSystemVersion       std  string version      UIDevice currentDevice  systemVersion  UTF8String       std  vector lt int gt  versions      auto i   version begin         while  i    version end              auto nextIllegalChar   std  find if i  version end        char c  - gt  bool   return  isdigit c                std  string versionPart i  nextIllegalChar           i   std  find if nextIllegalChar  version end    isdigit            versions push back boost  lexical cast lt int gt  versionPart               return versions         Losslessly parse system version into a number     return  lt 0 gt   the version as a number      return  lt 1 gt   how many numeric parts went into the composed number  e g     X Y Z   3   You need this to know how to compare again  lt 0 gt      -  std  tuple lt int  int gt   parseSystemVersion       std  string version      UIDevice currentDevice  systemVersion  UTF8String       int versionAsNumber   0      int nParts   0       auto i   version begin        while  i    version end              auto nextIllegalChar   std  find if i  version end        char c  - gt  bool   return  isdigit c                std  string versionPart i  nextIllegalChar           i   std  find if nextIllegalChar  version end    isdigit            int part    boost  lexical cast lt int gt  versionPart            versionAsNumber   versionAsNumber   100   part          nParts                return  versionAsNumber  nParts           Assume that the system version will not go beyond X Y Z W format      return The version string      -  int  parseSystemVersionAlt       std  string version      UIDevice currentDevice  systemVersion  UTF8String       int versionAsNumber   0      int nParts   0       auto i   version begin        while  i    version end    amp  amp  nParts  lt  4            auto nextIllegalChar   std  find if i  version end        char c  - gt  bool   return  isdigit c                std  string versionPart i  nextIllegalChar           i   std  find if nextIllegalChar  version end    isdigit            int part    boost  lexical cast lt int gt  versionPart            versionAsNumber   versionAsNumber   100   part          nParts                   don t forget to pad as systemVersion may have less parts  i e  X Y       for    nParts  lt  4  nParts              versionAsNumber    100             return versionAsNumber

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Using the refered recommended way    if there is no definition in the header files  you can always get the versi  n printing it on console with a device of the desired IOS versi  n   -  BOOL  isIOS8OrAbove      float version802   1140 109985      float version8  1139 100000     there is no def like NSFoundationVersionNumber iOS 7 1 for ios 8 yet      NSLog   la version actual es   f    NSFoundationVersionNumber       if  NSFoundationVersionNumber  gt   version8           return true            return false

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UIDevice IOSVersion h   interface UIDevice  IOSVersion      BOOL isCurrentIOSVersionEqualToVersion  NSString   iOSVersion     BOOL isCurrentIOSVersionGreaterThanVersion  NSString   iOSVersion     BOOL isCurrentIOSVersionGreaterThanOrEqualToVersion  NSString   iOSVersion     BOOL isCurrentIOSVersionLessThanVersion  NSString   iOSVersion     BOOL isCurrentIOSVersionLessThanOrEqualToVersion  NSString   iOSVersion   end   UIDevice IOSVersion m   import  UIDevice IOSVersion h    implementation UIDevice  IOSVersion      BOOL isCurrentIOSVersionEqualToVersion  NSString   iOSVersion       return    UIDevice currentDevice  systemVersion  compare iOSVersion options NSNumericSearch     NSOrderedSame        BOOL isCurrentIOSVersionGreaterThanVersion  NSString   iOSVersion       return    UIDevice currentDevice  systemVersion  compare iOSVersion options NSNumericSearch     NSOrderedDescending        BOOL isCurrentIOSVersionGreaterThanOrEqualToVersion  NSString   iOSVersion       return    UIDevice currentDevice  systemVersion  compare iOSVersion options NSNumericSearch     NSOrderedAscending        BOOL isCurrentIOSVersionLessThanVersion  NSString   iOSVersion       return    UIDevice currentDevice  systemVersion  compare iOSVersion options NSNumericSearch     NSOrderedAscending        BOOL isCurrentIOSVersionLessThanOrEqualToVersion  NSString   iOSVersion       return    UIDevice currentDevice  systemVersion  compare iOSVersion options NSNumericSearch     NSOrderedDescending      end

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define SYSTEM VERSION GREATER THAN OR EQUAL TO v       UIDevice currentDevice  systemVersion  compare v options NSNumericSearch     NSOrderedAscending    Then add a if condition as follows -  if SYSTEM VERSION GREATER THAN OR EQUAL TO   10 0           Your code

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Solution for checking iOS version in Swift  switch  UIDevice currentDevice   systemVersion compare  8 0 0   options  NSStringCompareOptions NumericSearch         case  OrderedAscending         println  iOS  lt  8 0        case  OrderedSame   OrderedDescending         println  iOS  gt   8 0       Con of this solution  it is simply bad practice to check against OS version numbers  whichever way you do it  One should never hard code dependencies in this way  always check for features  capabilities or the existence of a class  Consider this  Apple may release a backwards compatible version of a class  if they did then the code you suggest would never use it as your logic looks for an OS version number and NOT the existence of the class    Source of this information   Solution for checking the class existence in Swift  if  objc getClass  UIAlertController      nil          iOS 7   else         iOS 8      Do not use if  NSClassFromString  UIAlertController      nil  because it works correctly on the iOS simulator using iOS 7 1 and 8 2  but if you test on a real device using iOS 7 1  you will unfortunately notice that you will never pass through the else part of the code snippet

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Try the below code   NSString  versionString     UIDevice currentDevice  systemVersion

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Basically the same idea as this one https   stackoverflow com a 19903595 1937908 but more robust    ifndef func i system version field  define func i system version field  inline static int i system version field unsigned int fieldIndex      NSString  const versionString   UIDevice currentDevice systemVersion    NSArray lt NSString  gt   const versionFields    versionString componentsSeparatedByString          if  fieldIndex  lt  versionFields count        NSString  const field   versionFields fieldIndex       return field intValue        NSLog    WARNING  i system version  iu   field index not present in version string         fieldIndex  versionString     return -1     error indicator     endif   Simply place the above code in a header file   Usage   int major   i system version field 0   int minor   i system version field 1   int patch   i system version field 2

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From the the Home Screen  tap Settings   General   About  The software version of your device should appear on this screen  Check whether the version number is greater than 3 1 3

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Just for retrieving the OS version string value     UIDevice currentDevice  systemVersion

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Here is a swift version   struct iOSVersion       static let SYS VERSION FLOAT    UIDevice currentDevice   systemVersion as NSString  floatValue     static let iOS7    Version SYS VERSION FLOAT  lt  8 0  amp  amp  Version SYS VERSION FLOAT  gt   7 0      static let iOS8    Version SYS VERSION FLOAT  gt   8 0  amp  amp  Version SYS VERSION FLOAT  lt  9 0      static let iOS9    Version SYS VERSION FLOAT  gt   9 0  amp  amp  Version SYS VERSION FLOAT  lt  10 0      Usage   if iOSVersion iOS8         Do iOS8 code here

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The quick answer       As of Swift 2 0  you can use  available in an if or guard to protect code that should only be run on certain systems   if  available iOS 9           In Objective-C  you need to check the system version and perform a comparison     NSProcessInfo processInfo  operatingSystemVersion  in iOS 8 and above   As of Xcode 9   if   available iOS 9            The full answer      In Objective-C  and Swift in rare cases  it s better to avoid relying on the operating system version as an indication of device or OS capabilities   There is usually a more reliable method of checking whether a particular feature or class is available   Checking for the presence of APIs   For example  you can check if UIPopoverController is available on the current device using NSClassFromString   if  NSClassFromString   UIPopoverController             Do something     For weakly linked classes  it is safe to message the class  directly  Notably  this works for frameworks that aren t explicitly linked as  Required   For missing classes  the expression evaluates to nil  failing the condition   if   LAContext class            Do something     Some classes  like CLLocationManager and UIDevice  provide methods to check device capabilities   if   CLLocationManager headingAvailable            Do something     Checking for the presence of symbols   Very occasionally  you must check for the presence of a constant  This came up in iOS 8 with the introduction of UIApplicationOpenSettingsURLString  used to load Settings app via -openURL   The value didn t exist prior to iOS 8  Passing nil to this API will crash  so you must take care to verify the existence of the constant first   if   amp UIApplicationOpenSettingsURLString    NULL          UIApplication sharedApplication  openURL  NSURL URLWithString UIApplicationOpenSettingsURLString        Comparing against the operating system version   Let s assume you re faced with the relatively rare need to check the operating system version  For projects targeting iOS 8 and above  NSProcessInfo includes a method for performing version comparisons with less chance of error   -  BOOL isOperatingSystemAtLeastVersion  NSOperatingSystemVersion version   Projects targeting older systems can use systemVersion on UIDevice  Apple uses it in their GLSprite sample code      A system version of 3 1 or greater is required to use CADisplayLink  The NSTimer    class is used as fallback when it isn t available  NSString  reqSysVer     3 1   NSString  currSysVer     UIDevice currentDevice  systemVersion   if   currSysVer compare reqSysVer options NSNumericSearch     NSOrderedAscending        displayLinkSupported   TRUE      If for whatever reason you decide that systemVersion is what you want  make sure to treat it as an string or you risk truncating the patch revision number  eg  3 1 2 -  3 1

User · Answer

a bit late to the party but in light of iOS 8 0 out there this might be relevant   if you can avoid using     UIDevice currentDevice  systemVersion   Instead check for existence of of a method class whatever else   if   self yourClassInstance respondsToSelector  selector  lt yourMethod gt               do stuff      I found it to be useful for location manager where I have to call requestWhenInUseAuthorization for iOS 8 0 but the method is not available for iOS  lt  8

User · Answer

All answers look a bit to big  I just use   if  SYSTEM VERSION GREATER THAN   7 0       CODE      if  SYSTEM VERSION EQUAL TO   7 0       CODE      if  SYSTEM VERSION GREATER THAN OR EQUAL TO   7 0       CODE      if  SYSTEM VERSION LESS THAN   7 0       CODE      if  SYSTEM VERSION LESS THAN OR EQUAL TO   7 0       CODE        Of course replace the   7 0  with your required OS version

[ios] How to check iOS version?

Preferred Approach

Pre Swift 2.0

Deploying on iOS 8 and greater

Deploying on iOS 7

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