Convert string to timer, and add 1 minute to the string

Question

If I have a string from key and the string is a timer (12:00) how to add 1 minute to the timer, so the label will show 12:01:

NSString string = [subDict objectForKey:@"1"];

NSScanner timeScanner=[NSScanner scannerWithString:string];
int hours,minutes;
[timeScanner scanInt:&hours];
[timeScanner scanString:@":" intoString:nil]; 
[timeScanner scanInt:&minutes];

Thanks

Answer 1

Make sure to take care of the carry. As to a simple solution, you don't even need a scanner:

NSString *timeStr = @"23:59";

NSArray *comps = [timeStr componentsSeparatedByString:@":"];
int h = [comps[0] intValue];
int m = [comps[1] intValue];

h += (m + 1) / 60;
h %= 24;

m = (m + 1) % 60;

NSLog(@"The new time is: %02d:%02d", h, m);

Answer 2

try like this,

 self.mylabel.text= [NSString stringWithFormat:@"%02d:%02d",[[string substringToIndex:2] intValue],[[string substringFromIndex:3] intValue]+1];