How to convert string to NSNumber in objective C?
Use an NSNumberFormatter : NSNumberFormatter *f = [[NSNumberFormatter alloc] init]; f. numberStyle = NSNumberFormatterDecimalStyle; NSNumber *myNumber = [f numberFromString:@”42″]; If the string is not a valid number, then myNumber will be nil .
How to convert string into NSNumber in swift?
Swift 2.0. Use the Int() initialiser like this. This can be done in one line if you already know the string will convert perfectly or you just don’t care. let myNumber = Int(“42222222222”)!
What is NSNumber in objective C?
NSNumber is a subclass of NSValue that offers a value as any C scalar (numeric) type. It defines a set of methods specifically for setting and accessing the value as a signed or unsigned char , short int , int , long int , long long int , float , or double or as a BOOL .
What is NSString in objective C?
Like NSNumber, NSString is also immutable type. It’s used to represent text in Objective-C. NSString provides built-in support for Unicode, which means that we can include UTF-8 characters directly in string literals. stringWithFormat: class method is useful for generating strings that are composed of variable values.
What is NSMutableArray Objective-C?
NSArray is Objective-C’s general-purpose array type. It represents an ordered collection of objects. NSArray is immutable, so we cannot dynamically add or remove items.
How are NSNumber and NSString used in Objective C?
It’s used to represent text in Objective-C. NSString provides built-in support for Unicode, which means that we can include UTF-8 characters directly in string literals. stringWithFormat: class method is useful for generating strings that are composed of variable values.
Can a NSNumber be converted to a string?
The funny thing is that NSNumber converts to string automatically if it becomes a part of a string. I don’t think it is documented. Try these: We can get the number value in String.
What kind of string format does NSString use?
NSString uses a format string whose syntax is similar to that used by other formatter objects. It supports the format characters defined for the ANSI C function printf (), plus %@ for any object (see String Format Specifiers and the IEEE printf specification ).
How to convert NSNumber to NSString in Cocoa?
So you’ll need to extract the appropriate values from that before attempting to convert. Note that most Cocoa object types, including NSNumber, can be converted to strings by calling the description method (or using %@ in a format string). – walkytalky Oct 19 ’10 at 16:04