How to convert an NSString into an NSNumber

Question

How can I convert a NSString containing a number of any primitive data type  e g  int  float  char  unsigned int  etc    The problem is  I don t know which number type the string will contain at runtime   I have an idea how to do it  but I m not sure if this works with any type  also unsigned and floating point values   long long scannedNumber  NSScanner  scanner    NSScanner scannerWithString aString    scanner scanLongLong  amp scannedNumber    NSNumber  number    NSNumber numberWithLongLong  scannedNumber     Thanks for the help

User · Answer

NSDecimalNumber  myNumber    NSDecimalNumber decimalNumberWithString   123 45    NSLog   My Number       myNumber

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Here s a working sample of NSNumberFormatter reading localized number NSString  xCode 3 2 4  osX 10 6   to save others the hours I ve just spent messing around  Beware  while it can handle trailing blanks   8 765 4   works   this cannot handle leading white space and this cannot handle stray text characters   Bad input strings    8   and  8q  and  8 q     NSString  tempStr     8 765 4             localization allows other thousands separators  also  NSNumberFormatter   myNumFormatter     NSNumberFormatter alloc  init    myNumFormatter setLocale  NSLocale currentLocale       happen by default   myNumFormatter setFormatterBehavior NSNumberFormatterBehavior10 4           next line is very important   myNumFormatter setNumberStyle NSNumberFormatterDecimalStyle      crucial  NSNumber  tempNum    myNumFormatter numberFromString tempStr   NSLog   string      gives NSNumber      with intValue   i         tempStr  tempNum   tempNum intValue     myNumFormatter release       good citizen

User · Answer

Objective-C   Note  this method doesn t play nice with difference locales  but is slightly faster than a NSNumberFormatter   NSNumber  num1        42  intValue    NSNumber  num2        42 42  floatValue        Swift  Simple but dirty way     Swift 1 2 if let intValue    42  toInt         let number1   NSNumber integer intValue        Swift 2 0 let number2   Int  42       Swift 3 0 NSDecimalNumber string   42 42        Using NSNumber let number3   NSNumber float   42 42  as NSString  floatValue    The extension-way This is better  really  because it ll play nicely with locales and decimals    extension String        var numberValue NSNumber            let formatter   NSNumberFormatter           formatter numberStyle    DecimalStyle         return formatter number from  self            Now you can simply do   let someFloat    42 42  numberValue let someInt    42  numberValue

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Worked in Swift 3    NSDecimalNumber string   Your string

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I know this is very late but below code is working for me   Try this code  NSNumber  number      dictionary   keyValue   intValue      This may help you  Thanks

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You can just use  string intValue  or  string floatValue  or  string doubleValue  etc  You can also use NSNumberFormatter class

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Thanks All  I am combined feedback and finally manage to convert from text input   string   to Integer  Plus it could tell me whether the input is integer     NSNumberFormatter   f     NSNumberFormatter alloc  init    f setNumberStyle NSNumberFormatterDecimalStyle   NSNumber   myNumber    f numberFromString thresholdInput text    int minThreshold    myNumber intValue     NSLog   Setting for minThreshold  i   minThreshold    if   int minThreshold  lt  1         NSLog   Not a number      else       NSLog   Setting for integer minThreshold  i   minThreshold      f release

User · Answer

Use an NSNumberFormatter  NSNumberFormatter  f     NSNumberFormatter alloc  init   f numberStyle   NSNumberFormatterDecimalStyle  NSNumber  myNumber    f numberFromString   quot 42 quot     If the string is not a valid number  then myNumber will be nil   If it is a valid number  then you now have all of the NSNumber goodness to figure out what kind of number it actually is

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If you know that you receive integers  you could use   NSString  val     12    NSNumber numberWithInt  val intValue

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For strings starting with integers  e g     123     456 ft     7 89   etc   use - NSString integerValue    So       12 8 lbs  integerValue   is like doing  NSNumber numberWithInteger 12

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You can use - NSString integerValue   - NSString floatValue   etc  However  the correct  locale-sensitive  etc   way to do this is to use - NSNumberFormatter numberFromString   which will give you an NSNumber converted from the appropriate locale and given the settings of the NSNumberFormatter  including whether it will allow floating point values

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Try this   NSNumber  yourNumber    NSNumber numberWithLongLong  yourString longLongValue      Note - I have used longLongValue as per my requirement  You can also use integerValue  longValue  or any other format depending upon your requirement

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I think NSDecimalNumber will do it   Example   NSNumber  theNumber    NSDecimalNumber decimalNumberWithString  stringVariable text       NSDecimalNumber is a subclass of NSNumber  so implicit casting allowed

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you can also do like this code 8 3 3 ios 10 3 support   NSNumber numberWithInt    put your string here  intValue

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extension String        var numberValue NSNumber            let formatter   NumberFormatter           formatter numberStyle    decimal         return formatter number from  self           let someFloat    12 34  numberValue

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What about C s standard atoi   int num   atoi  scannedNumber cStringUsingEncoding NSUTF8StringEncoding      Do you think there are any caveats

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You can also do this   NSNumber  number      dictionary   id   intValue       Have fun

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I wanted to convert a string to a double  This above answer didn t quite work for me  But this did  How to do string conversions in Objective-C   All I pretty much did was   double myDouble    myString doubleValue

[objective-c] How to convert an NSString into an NSNumber

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