xcode - UIButton Difficult to Press Near iPhone Edges -

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i'm having problem uibuttons responding tap near edge of iphone. after creating new xcode project, dragging button viewcontroller in storyboard near left-lower corner, , running simulator, button appears respond nicely tap on entire surface area of button.

however, if run program on iphone, uibutton takes 1 second register lower-half of button register upper half of button. why this? then, when drag button towards center of iphone screen, registers tap @ point across button surface area immediately.

try running app button near edge - same result?

enter image description here

here screen shot of lower-left corner of viewcontroller - nothing special @ all. have viewcontroller buttons added along bottom edge of iphone.

edit

although have not yet resolved issue, have discovered control center , notification center features of iphone interfering buttons. know way around this?

adding viewcontroller.m resolved issue:

- (bool)prefersstatusbarhidden {     return yes; }

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