Ios UILabel update performance

Question

in my application i have an UILabel showing a time updated every second. I have also draggable objects in the screen. When I hide the label or i stop the timer everything is perfect but when i start the timer the animation performance of dragging objects go down. I put the UILabel updating in a separate thread but no luck. I need help friends :)

Answer 1

This is my code:

self.timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(onTimer:) userInfo:nil repeats:YES];

-(void) onTimer:(NSTimer *)timer; {

timeInterval ++;
int hours = (int)timeInterval / 3600;   

int minutes = (timeInterval %3600)/ 60; 
int seconds = ((timeInterval%3600)%60);
NSString *timeDiff = [NSString stringWithFormat:@"%d:%02d:%02d", hours,minutes,seconds];

[NSThread detachNewThreadSelector:@selector(setText:) toTarget:self.time withObject:timeDiff];

}