How to prevent UIButton from flashing when updating the title
When I call setTitle on a UIButton, the button flashes in iOS 7. I tried setting myButton.highlighted = NO, but that didn't stop the button from flashing.
[myButton setTitle:[[NSUserDefaults standardUserDefaults] stringForKey:@"elapsedLabelKey"] forState:UIControlStateNormal];
myButton.highlighted = NO;
Here is how I set up the timer that updated the titles:
- (void)actionTimer {
if (myTimer == nil) {
myTimer = [NSTimer scheduledTimerWithTimeInterval: 1.0
target: self
selector: @selector(showActivity)
userInfo: nil
repeats: YES];
}
}
Here is the method that actually updates the titles:
- (void)showActivity {
NSString *sym = [[NSLocale currentLocale] objectForKey:NSLocaleCurrencySymbol];
if (pauseInterval == nil) {
// Update clock
seconds = [[NSDate date] timeIntervalSinceDate:startInterval] - breakTime;
// Update total earned
secRate = rate.value / 60 / 60;
total = secRate * seconds;
[totalLabel setTitle:[NSString stringWithFormat:@"%@%.4f",sym,total] forState:UIControlStateNormal];
days = seconds / (60 * 60 * 24);
seconds -= days * (60 * 60 * 24);
int hours = seconds / (60 * 60);
fhours = (float)seconds / (60.0 * 60.0);
seconds -= hours * (60 * 60);
int minutes = seconds / 60;
seconds -= minutes * 60;
// Update the timer clock
[elapsed setTitle:[NSString stringWithFormat:@"%.2i:%.2i:%.2i:%.2i",days,hours,minutes,seconds] forState:UIControlStateNormal];
}
}
Solution 1:
Set the button type to UIButtonTypeCustom and it'll stop flashing
Solution 2:
A better approach than [UIView setAnimationsEnabled:NO]
which may affect other animations is to only disable the specific title animation.
Objective-C:
[UIView performWithoutAnimation:^{
[myButton setTitle:text forState:UIControlStateNormal];
[myButton layoutIfNeeded];
}];
Swift:
UIView.performWithoutAnimation {
myButton.setTitle(text, for: .normal)
myButton.layoutIfNeeded()
}
Solution 3:
*Please note *
when "buttonType" of _button is "UIButtonTypeSystem", below code is invalid:
[UIView setAnimationsEnabled:NO];
[_button setTitle:@"title" forState:UIControlStateNormal];
[UIView setAnimationsEnabled:YES];
when "buttonType" of _button is "UIButtonTypeCustom", above code is valid.