使用导航项目向下滑动手势

Question

嗨，我想使用向下滑动的手势导航回到主菜单。 问题是我正在使用导航项（从导航控制器中提取），因此无法检测到向下滑动。 我该如何解决？

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIScreenEdgePanGestureRecognizer *bezelSwipeGestureRecognizer = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(swipeBack:)];
    bezelSwipeGestureRecognizer.edges = UIRectEdgeTop;
    bezelSwipeGestureRecognizer.delegate = self;
    [self.view addGestureRecognizer:bezelSwipeGestureRecognizer];

    UIView *invisibleScrollPreventer = [UIView new];
    invisibleScrollPreventer.frame = CGRectMake(0, 0, self.view.frame.size.width, 100);
    [self.view addSubview:invisibleScrollPreventer];

}

-(void)swipeBack:(UIScreenEdgePanGestureRecognizer *)recognizer
{
    if (recognizer.state == UIGestureRecognizerStateEnded) {
        NSLog(@"Top Swipe");

        [self.presentingViewController dismissViewControllerAnimated:YES completion:nil];

    }
}

谢谢！

Answer 1

尝试这个

-(void)swipeBack:(UIScreenEdgePanGestureRecognizer *)recognizer
{
    if (recognizer.state == UIGestureRecognizerStateEnded)
    {
        NSLog(@"Top Swipe");

        [self.navigationController popViewControllerAnimated:YES];


    }
}

Answer 2

首先，为手势识别器创建一个出口：

@IBOutlet var swipeDownGestureRecognizer: UISwipeGestureRecognizer!

其次，将识别器添加到导航栏中：

navigationController?.navigationBar.addGestureRecognizer(swipeDownGestureRecognizer)