How to prevent UIButton from flashing when updating the title

Question

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.

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Answer 1

I'm new to coding and Stackoverflow, so don't have enough reputation to comment directly to expand on https://stackoverflow.com/users/4673064/daniel-tseng excellent answer. So I have to write my own new answer, and it is this:

extension UIButton {
    func setTitleWithoutAnimation(_ title: String?, for controlState: UIControlState) {
        UIView.performWithoutAnimation {
            self.setTitle(title, for: controlState)
            self.layoutIfNeeded()
        }
    }
}

Works great, EXCEPT:

If all my calls later on in the code to "setTitleWithoutAnimation" do not specify a sender, then I get these weird messages related to CoreMedia or CoreData, e.g., "Failed to inherit CoreMedia permissions from 2526: (null)"

This is probably pretty basic to coding and iOS, but for me as a new coder, it sent me on a rabbit trail for a while, as in: Today Extension Failed to inherit CoreMedia permissions from, where people had interesting answers but that did NOT reach the root of my problem.

So I finally found that I had to go through and give my parameter-less functions parameters, i.e., I had to specify a sender. That sender could be UIButton, Any, or AnyObject. All of those worked, but ultimately there appears to be a conflict between adding a button extension with "self" and not specifically saying later on that a button is using it.

Again, probably basic, but new to me, so I figured it would be worth sharing.

Answer 2

See the responses from How to stop unwanted UIButton animation on title change? :

[UIView setAnimationsEnabled:NO];
[elapsed setTitle:[NSString stringWithFormat:@"%.2i:%.2i:%.2i:%.2i",days,hours,minutes,seconds] forState:UIControlStateNormal];
[UIView setAnimationsEnabled:YES];

Answer 3

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()
}