Check OS version in Swift

Question

I m trying to check system information in Swift  I figured out  that it could be achieved by code   var sysData CMutablePointer lt utsname gt    nil let retVal CInt   uname sysData    I have two problems with this code    What should be sysData s initial value  This example gives -1 in retVal probably because sysData is nil  How can I read information from sysData

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Mattt Thompson shares a very handy way   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

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Based on Matt Thompson s answer  here is a method with respective unit tests that works with Swift and Objective-c on iOS 7 and above  including iOS 9 which no longer let s you check the NSFoundationNumber       BOOL  isAtLeastOSVersion  NSString   osVersion       switch    UIDevice currentDevice  systemVersion compare osVersion options NSNumericSearch             case NSOrderedSame          case NSOrderedDescending              return YES          default              return NO                  interface ANFakeCurrDevice   NSObject  property  nonatomic  strong  NSString  systemVersion   end  implementation ANFakeCurrDevice  end    implementation MyHelperClassUnitTests  -  void setUp        super setUp      -  void tearDown        super tearDown      -  void test isAtLeastOSVersion       id deviceMock    OCMockObject niceMockForClass  UIDevice class        ANFakeCurrDevice  fakeCurrDevice    ANFakeCurrDevice new       fakeCurrDevice systemVersion     99 9 9          deviceMock stub  andReturn fakeCurrDevice  currentDevice       XCTAssertTrue   UIDevice currentDevice  systemVersion isEqualToString   99 9 9          fakeCurrDevice systemVersion     1 0 1       XCTAssertTrue  ANConstants isAtLeastOSVersion   1         XCTAssertTrue  ANConstants isAtLeastOSVersion   1 0         XCTAssertTrue  ANConstants isAtLeastOSVersion   1 0 1         XCTAssertFalse  ANConstants isAtLeastOSVersion   1 0 2         XCTAssertFalse  ANConstants isAtLeastOSVersion   1 1 0         XCTAssertFalse  ANConstants isAtLeastOSVersion   2         XCTAssertFalse  ANConstants isAtLeastOSVersion   2 0         XCTAssertFalse  ANConstants isAtLeastOSVersion   2 0 0         XCTAssertFalse  ANConstants isAtLeastOSVersion   2 0 1         XCTAssertFalse  ANConstants isAtLeastOSVersion   2 1 0           fakeCurrDevice systemVersion     8 4 0       XCTAssertTrue  ANConstants isAtLeastOSVersion   7 0 1         XCTAssertTrue  ANConstants isAtLeastOSVersion   8         XCTAssertTrue  ANConstants isAtLeastOSVersion   8 4         XCTAssertFalse  ANConstants isAtLeastOSVersion   8 4 1         XCTAssertFalse  ANConstants isAtLeastOSVersion   8 4 2         XCTAssertFalse  ANConstants isAtLeastOSVersion   9 0         XCTAssertFalse  ANConstants isAtLeastOSVersion   9 0 1         XCTAssertFalse  ANConstants isAtLeastOSVersion   9 0 2         XCTAssertTrue  ANConstants isAtLeastOSVersion   8 4    amp  amp    ANConstants isAtLeastOSVersion   9 0          fakeCurrDevice systemVersion     8 4 1       XCTAssertTrue  ANConstants isAtLeastOSVersion   8 4    amp  amp    ANConstants isAtLeastOSVersion   9 0          end

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For iOS  try   var systemVersion   UIDevice current systemVersion   For OS X  try        var systemVersion   NSProcessInfo processInfo   operatingSystemVersion   If you just want to check if the users is running at least a specific version  you can also use the following Swift 2 feature which works on iOS and OS X   if  available iOS 9 0              use the feature only available in iOS 9        for ex  UIStackView   else          or use some work around     BUT it is not recommended to check the OS version  It is better to check if the feature you want to use is available on the device than comparing version numbers  For iOS  as mentioned above  you should check if it responds to a selector   eg     if  self respondsToSelector Selector  showViewController           self showViewController vc  sender  self    else          some work around

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I made this Singleton for simple use  created an IOSVersion swift file and added this code     import UIKit  public class IOSVersion       class func SYSTEM VERSION EQUAL TO version  NSString  - gt  Bool           return UIDevice currentDevice   systemVersion compare version              options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedSame            class func SYSTEM VERSION GREATER THAN version  NSString  - gt  Bool           return UIDevice currentDevice   systemVersion compare version as String              options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedDescending            class func SYSTEM VERSION GREATER THAN OR EQUAL TO version  NSString  - gt  Bool           return UIDevice currentDevice   systemVersion compare version as String              options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedAscending            class func SYSTEM VERSION LESS THAN version  NSString  - gt  Bool           return UIDevice currentDevice   systemVersion compare version as String              options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedAscending            class func SYSTEM VERSION LESS THAN OR EQUAL TO version  NSString  - gt  Bool           return UIDevice currentDevice   systemVersion compare version as String              options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedDescending           USE      IOSVersion SYSTEM VERSION EQUAL TO  8 0   IOSVersion SYSTEM VERSION LESS THAN  8 0     Thanks  KVISH  Edit Swift 2     if  available iOS 9 0                  else

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I made helper functions that were transferred from the below link into swift   How can we programmatically detect which iOS version is device running on   func SYSTEM VERSION EQUAL TO version  String  - gt  Bool       return UIDevice currentDevice   systemVersion compare version          options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedSame    func SYSTEM VERSION GREATER THAN version  String  - gt  Bool       return UIDevice currentDevice   systemVersion compare version          options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedDescending    func SYSTEM VERSION GREATER THAN OR EQUAL TO version  String  - gt  Bool       return UIDevice currentDevice   systemVersion compare version          options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedAscending    func SYSTEM VERSION LESS THAN version  String  - gt  Bool       return UIDevice currentDevice   systemVersion compare version          options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedAscending    func SYSTEM VERSION LESS THAN OR EQUAL TO version  String  - gt  Bool       return UIDevice currentDevice   systemVersion compare version          options  NSStringCompareOptions NumericSearch     NSComparisonResult OrderedDescending     It can be used like so   SYSTEM VERSION LESS THAN OR EQUAL TO  7 0     Swift 4 2  func SYSTEM VERSION EQUAL TO version  String  - gt  Bool       return UIDevice current systemVersion compare version  options   numeric      orderedSame    func SYSTEM VERSION GREATER THAN version  String  - gt  Bool       return UIDevice current systemVersion compare version  options   numeric      orderedDescending    func SYSTEM VERSION GREATER THAN OR EQUAL TO version  String  - gt  Bool       return UIDevice current systemVersion compare version  options   numeric      orderedAscending    func SYSTEM VERSION LESS THAN version  String  - gt  Bool       return UIDevice current systemVersion compare version  options   numeric      orderedAscending    func SYSTEM VERSION LESS THAN OR EQUAL TO version  String  - gt  Bool       return UIDevice current systemVersion compare version  options   numeric      orderedDescending

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Get current version of system and split it   So you can get major and minor version      let sys version   UIDevice current systemVersion let all version   sys version components separatedBy       print  Major version     all version 0     print  Minor version     all version 1

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If you re using Swift 2 and you want to check the OS version to use a certain API  you can use new availability feature   if  available iOS 8             iOS 8  code here    else         Code for iOS 7 and older versions        An important note  if you use  availability  Xcode will also        check that you don t use anything that was introduced in iOS 8        inside this  else  block  So  if you try to use UIAlertController       here  for instance  it won t compile  And it s great      I wrote this answer because it is the first question in Google for the swift 2 check system version query

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The easiest and the simplest way to check system version  and a lot of other versions  in Swift 2 and higher is   if  available iOS 9 0          check for iOS 9 0 and later      Also  with  available you can check versions of these   iOS iOSApplicationExtension macOS macOSApplicationExtension watchOS watchOSApplicationExtension tvOS tvOSApplicationExtension swift

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Swift 4 x  func iOS VERSION EQUAL TO version  String  - gt  Bool       return UIDevice current systemVersion compare version  options  NSString CompareOptions numeric     ComparisonResult orderedSame    func iOS VERSION GREATER THAN version  String  - gt  Bool       return UIDevice current systemVersion compare version  options  NSString CompareOptions numeric     ComparisonResult orderedDescending    func iOS VERSION GREATER THAN OR EQUAL TO version  String  - gt  Bool       return UIDevice current systemVersion compare version  options  NSString CompareOptions numeric     ComparisonResult orderedAscending    func iOS VERSION LESS THAN version  String  - gt  Bool       return UIDevice current systemVersion compare version  options  NSString CompareOptions numeric     ComparisonResult orderedAscending    func iOS VERSION LESS THAN OR EQUAL TO version  String  - gt  Bool       return UIDevice current systemVersion compare version  options  NSString CompareOptions numeric     ComparisonResult orderedDescending     Usage   if iOS VERSION GREATER THAN OR EQUAL TO version   11 0           Do something      P S  KVISH answer translated to Swift 4 x with renaming the functions as I am specifically using this snippet for the iOS app

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Details   Xcode 10 2 1  10E1001   Swift 5   Links  OperatingSystemVersion  Solution  extension OperatingSystemVersion       func getFullVersion separator  String        - gt  String           return    majorVersion   separator   minorVersion   separator   patchVersion            let os   ProcessInfo   operatingSystemVersion print os majorVersion              12 print os minorVersion              2 print os patchVersion              0 print os getFullVersion            12 2 0

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Swift 5 We dont need to create extension since ProcessInfo gives us the version info  You can see sample code for iOS as below  let os   ProcessInfo   operatingSystemVersion  switch  os majorVersion  os minorVersion  os patchVersion    case  let x        where x  lt  8      print  quot iOS  lt  8 0 0 quot    case  8  0          print  quot iOS  gt   8 0 0   lt  8 1 0 quot    case  8             print  quot iOS  gt   8 1 0   lt  9 0 quot    case  9             print  quot iOS  gt   9 0 0 quot    default      print  quot iOS  gt   10 0 0 quot      Reference  http   nshipster com swift-system-version-checking

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Most of sample codes written here will get unexpected result with extra-zero versions  For example    func SYSTEM VERSION GREATER THAN OR EQUAL TO version  String  - gt  Bool   return UIDevice current systemVersion compare version  options   numeric     ComparisonResult orderedAscending     This method won t return true with passed version  10 3 0  in iOS  10 3   This kind of result does not make sense and they must be regarded as same version  To get accurate comparison result  we must consider comparing all of number components in version string  Plus  providing global methods in all capital letters is not a good way to go  As version type we use in our SDK is a String  it s make sense that extending comparing functionality in String   To compare system version  all of the following examples should work   XCTAssertTrue UIDevice current systemVersion isVersion lessThan   99 0 0    XCTAssertTrue UIDevice current systemVersion isVersion equalTo  UIDevice current systemVersion   XCTAssertTrue UIDevice current systemVersion isVersion greaterThan   3 5 99    XCTAssertTrue UIDevice current systemVersion isVersion lessThanOrEqualTo   10 3 0 0 0 0 0 0    XCTAssertTrue UIDevice current systemVersion isVersion greaterThanOrEqualTo   10 3      You can check it out in my repository here https   github com DragonCherry VersionCompare

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Swift 5  func run         let version   OperatingSystemVersion majorVersion  13  minorVersion  0  patchVersion  0      if ProcessInfo processInfo isOperatingSystemAtLeast version            runNewCode         else           runLegacyCode            func runNewCode         guard  available iOS 13 0     else           fatalError                do new stuff    func runLegacyCode            do old stuff

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Update for Swift 3 0   func SYSTEM VERSION EQUAL TO version  String  - gt  Bool       return UIDevice current systemVersion compare version  options   numeric     ComparisonResult orderedSame    func SYSTEM VERSION GREATER THAN version  String  - gt  Bool       return UIDevice current systemVersion compare version  options   numeric     ComparisonResult orderedDescending    func SYSTEM VERSION GREATER THAN OR EQUAL TO version  String  - gt  Bool       return UIDevice current systemVersion compare version  options   numeric     ComparisonResult orderedAscending    func SYSTEM VERSION LESS THAN version  String  - gt  Bool       return UIDevice current systemVersion compare version  options   numeric     ComparisonResult orderedAscending    func SYSTEM VERSION LESS THAN OR EQUAL TO version  String  - gt  Bool       return UIDevice current systemVersion compare version  options   numeric     ComparisonResult orderedDescending

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Update  Now you should use new availability checking introduced with Swift 2  e g  To check for iOS 9 0 or later at compile time use this   if  available iOS 9 0              use UIStackView   else          show sad face emoji     or can be used with whole method or class    available iOS 9 0     func useStackView            use UIStackView     For more info see this   Run time checks   if you don t want exact version but want to check iOS 9 10 or 11 using if   let floatVersion    UIDevice current systemVersion as NSString  floatValue   EDIT  Just found another way to achieve this   let iOS8   floor NSFoundationVersionNumber   gt  floor NSFoundationVersionNumber iOS 7 1  let iOS7   floor NSFoundationVersionNumber   lt   floor NSFoundationVersionNumber iOS 7 1

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Note  Available in iOS 8 0 and later  OS X v10 10 and later  var majorVersion  Int      return NSProcessInfo processInfo   operatingSystemVersion majorVersion   var minorVersion  Int      return NSProcessInfo processInfo   operatingSystemVersion minorVersion   var patchVersion  Int      return NSProcessInfo processInfo   operatingSystemVersion patchVersion   var myOSVersion   String   return NSProcessInfo processInfo   operatingSystemVersionString

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let Device   UIDevice currentDevice   let iosVersion   NSString string  Device systemVersion  doubleValue  let iOS8   iosVersion  gt   8 let iOS7   iosVersion  gt   7  amp  amp  iosVersion  lt  8   and check as  if iOS8       else

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let osVersion   NSProcessInfo processInfo   operatingSystemVersion let versionString   osVersion majorVersion description         osVersion minorVersion description         osVersion patchVersion description print versionString

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Also if you want to check WatchOS   Swift  let watchOSVersion   WKInterfaceDevice currentDevice   systemVersion print  WatchOS version    watchOSVersion      Objective-C  NSString  watchOSVersion     WKInterfaceDevice currentDevice  systemVersion   NSLog   WatchOS version       watchOSVersion

[ios] Check OS version in Swift?

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