iOS add-on view button is unresponsive

Above this picture black is a view, yellow is 2 button, although we can now see the 2 button, but we click it is unresponsive

Reason 1: These 2 buttons are no longer within the frame of the view, that is, beyond the bounds, (of course, if there is a cross, a little bit, we point that a little bit can be left button click event)

Cause 2:butotn in the view, there may be imageview or Uilabel, because the default interaction of the 2 controls is closed, you put the button on this attempt, then the child view all the interaction will be closed.

Workaround: Open the ImageView or Uilabel interaction, the code is as follows

xxx.userinteractionenabled = YES;

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iOS add-on view button is unresponsive