UIPanGestureRecognizer 和 UISwipeGestureRecognizer 同时存在，优先响应swipe

- (UIPanGestureRecognizer *)panGesture{
    if (!_panGesture) {
        _panGesture = [[UIPanGestureRecognizer alloc] init];
    }
    return _panGesture;
}

- (UISwipeGestureRecognizer *)swipeGestureLeft{
    if (!_swipeGestureLeft) {
        _swipeGestureLeft = [[UISwipeGestureRecognizer alloc] init];
        _swipeGestureLeft.direction = UISwipeGestureRecognizerDirectionLeft;
    }
    return _swipeGestureLeft;
}

[self.panGesture requireGestureRecognizerToFail:self.swipeGestureLeft];
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