If you’re using a UIButton and it’s responding to UIControlEventTouchDown but nothing else, for example UIControlEventTouchUpInside, first check to make sure you don’t have a conflict with a gesture recognizer that is swallowing the touches. If that isn’t the case, you probably have some touchesBegan/Ended code somewhere that’s catching the UIControlEventTouchUpInside event and doing nothing with it. Look for that function.
An iOS programming gotcha I came across today…September 17th, 2012 by Richard Felix
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