objective c - iOS - UIButton requires two taps with UIControlEventTouchUpInside -

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for reason uibutton requires 2 taps trigger , don't understand why, not desired functionality , of other buttons work expected

here addtarget code:

[self.mybutton addtarget:self action:@selector(publishbuttontapped) forcontrolevents:uicontroleventtouchupinside];

my function publishbuttontapped not triggered until second tap in quick succession.

there must else overlooking, insight appreciated

my button , layout created programmatically, there no xib or storyboard.


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