iOS 11問題-如果將手勢添加到導航欄，則不會觸發欄按鈕操作

Question

這在iOS 10上運行良好。但是在iOS 11 showFlyoutMenu無法運行showFlyoutMenu沒有啟動。

gestureLeftArrow = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(leftArrowGesture:)];
            [self.navigationController.navigationBar addGestureRecognizer:gestureLeftArrow];

            gestureRightArrow = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(rightArrowGesture:)];
            [self.navigationController.navigationBar addGestureRecognizer:gestureRightArrow];  


UIImage *image = [[UIImage imageNamed:@"hamburger-new.png"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
        UIBarButtonItem *flyoutButton = [[UIBarButtonItem alloc] initWithImage:image style:UIBarButtonItemStylePlain target:self action:@selector(showFlyoutMenu)];
        self.navigationItem.rightBarButtonItem = flyoutButton;

Answer 1

您應該將手勢識別器的cancelsTouchesInView設置為false 。
請參閱： cancelsTouchesInView

討論區
當此屬性為true（默認值）並且接收方識別出其手勢時，該手勢的未決觸摸不會傳遞到視圖，並且先前發送的觸摸會通過發送給視圖的touchesCancelled（_：with :)消息取消。 如果手勢識別器無法識別其手勢，或者此屬性的值為false，則視圖將接收多點觸摸序列中的所有觸摸。