UILabel updating stops during scrolling UIScrollView

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I had recently the same trouble and found the solution here: My custom UI elements….

In short: while your UIScrollView is scrolling, the NSTimer is not updated because the run loops run in a different mode (NSRunLoopCommonModes, mode used for tracking events).

The solution is adding your timer to the NSRunLoopModes just after creation:

NSTimer *elapsedTimeTimer = [NSTimer scheduledTimerWithTimeInterval:0.001 
                                                             target:self 
                                                           selector:@selector(updateElapsedTimeLabel) 
                                                           userInfo:nil 
                                                            repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:elapsedTimeTimer 
                             forMode:NSRunLoopCommonModes];

(The code comes from the post linked above).

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