How to capture last 4 characters from NSString

Question

I am accepting an NSString of random size from a UITextField and passing it over to a method that I am creating that will capture only the last 4 characters entered in the string.

I have looked through NSString Class Reference library and the only real option I have found that looks like it will do what I want it to is

- (void)getCharacters:(unichar *)buffer range:(NSRange)aRange 

I have used this once before but with static parameters 'that do not change', But for this implementation I am wanting to use non static parameters that change depending on the size of the string coming in.

So far this is the method I have created which is being passed a NSString from an IBAction else where.

- (void)padString:(NSString *)funcString {      NSString *myFormattedString = [NSString stringWithFormat:@"%04d",[funcString intValue]]; // if less than 4 then pad string     //   NSLog(@"my formatedstring = %@", myFormattedString);      int stringLength = [myFormattedString length]; // captures length of string maybe I can use this on NSRange?       //NSRange MyOneRange = {0, 1}; //<<-------- should I use this? if so how?  } 

Answer 1

Use the substringFromIndex method,

OBJ-C:

NSString *trimmedString=[string substringFromIndex:MAX((int)[string length]-4, 0)]; //in case string is less than 4 characters long. 

SWIFT:

let trimmedString: String = (s as NSString).substringFromIndex(max(s.length-4,0)) 

Answer 2

Try This,

NSString *lastFourChar = [yourNewString substringFromIndex:[yourNewString length] - 4];