How to change colour of all numbers in a string in swift

Question

I am trying to change colour for all numbers present in a string in swift code.Example:

var mystring = \"abc 3423 opqrs 474598 lmno 343543\"
         


        

Answer 1

I am not much familiar with swift but i have try to make demo in objective c and it's works fine as your requirement if it can help,

  NSString *str = @"abc 3423 opqrs 474598 lmno 343543";

NSMutableAttributedString *str1 = [[NSMutableAttributedString alloc]initWithString:@"abc 3423 opqrs 474598 lmno 343543"];

NSArray *arr = [str componentsSeparatedByString:@" "];

for (int i = 0; i < arr.count; i++) {


    NSString *temp = [arr objectAtIndex:i];

    NSCharacterSet* notDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
    if ([temp rangeOfCharacterFromSet:notDigits].location == NSNotFound)
    {
        NSDictionary *attrs = @{

                                NSForegroundColorAttributeName:[UIColor redColor]
                                };

        NSRange range = [str rangeOfString:[arr objectAtIndex:i]];

        [str1 addAttributes:attrs range:range];
    }


}

UILabel *temp = [[UILabel alloc]initWithFrame:CGRectMake(20, 20, 300, 50)];

[self.view addSubview:temp];

temp.attributedText = str1;

You can use logic and concept and can use in swift as your requirement.

Hope this will help :)