# ある特定の View だけ UIGestureRecognizer のイベントを受け取らない

一番奥の UIView に UIGestureRecognizer を設置し、手前に UIButton　などを設置した時、UIButton を押しても UIGestureRecognizer のイベントが起きてしまう。

こういう時は Delegate メソッドの - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch; を使う。

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    // test if our control subview is on-screen
    if (self.controlSubview.superview != nil) {
        if ([touch.view isDescendantOfView:self.controlSubview]) {
            // we touched our control surface
            return NO; // ignore the touch
        }
    }
    return YES; // handle the touch
}

via: http://stackoverflow.com/questions/3344341/uibutton-inside-a-view-that-has-a-uitapgesturerecognizer