Objective c 如何在Xcode中向下滑动以关闭当前页面

所以我写了这行代码来关闭当前的教程页面，让用户使用该应用程序，但是当你向下滑动时，教程页面将消失1秒，然后它会回来

因此，我在教程的view controller.m中编写了这些代码行

-(void)swipeHappened:(UISwipeGestureRecognizer *)swipe
{
    NSLog(@"Swipe Occurred");

    switch (swipe.direction) {
        case UISwipeGestureRecognizerDirectionRight:
            NSLog(@"Right");
            [self dismissViewControllerAnimated:YES completion:nil];
            break;
        case UISwipeGestureRecognizerDirectionLeft:
            NSLog(@"Left");
            break;
        case UISwipeGestureRecognizerDirectionUp:
            NSLog(@"Up");
            break;
        case UISwipeGestureRecognizerDirectionDown:
            NSLog(@"Down");
            break;
    }

}

 -(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];


    TutorialViewController *tutorialViewController=[[TutorialViewController alloc] initWithNibName:@"TutorialViewController" bundle:nil];
    [self presentViewController:tutorialViewController animated:YES completion:NULL];


    //I  HAVE A PROBLEM HERE( there's no error that appears in Xcode but it is not the result I expected 

}

这些都在mainviewcontroller.m中

-(void)swipeHappened:(UISwipeGestureRecognizer *)swipe
{
    NSLog(@"Swipe Occurred");

    switch (swipe.direction) {
        case UISwipeGestureRecognizerDirectionRight:
            NSLog(@"Right");
            [self dismissViewControllerAnimated:YES completion:nil];
            break;
        case UISwipeGestureRecognizerDirectionLeft:
            NSLog(@"Left");
            break;
        case UISwipeGestureRecognizerDirectionUp:
            NSLog(@"Up");
            break;
        case UISwipeGestureRecognizerDirectionDown:
            NSLog(@"Down");
            break;
    }

}

 -(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];


    TutorialViewController *tutorialViewController=[[TutorialViewController alloc] initWithNibName:@"TutorialViewController" bundle:nil];
    [self presentViewController:tutorialViewController animated:YES completion:NULL];


    //I  HAVE A PROBLEM HERE( there's no error that appears in Xcode but it is not the result I expected 

}

---

有几件事可能是问题所在。首先，MainViewController是TutorialViewController的父级吗？如果是这样的话，那么当您关闭教程并且主控制器调用ViewDidDisplay时，您就是将教程弹回到原位

如果这是问题所在，则需要删除viewDidAppear中显示教程的代码。也许可以将它作为您的第一个控制器从应用程序代理中呈现出来

此外，UISweepGestureRecognizer的direction属性仅用于设置方向，因此您的switch语句可能无法按预期的方式工作。尝试创建一个特定于方向的识别器，如下所示：

UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeRight:);
[swipeRight setDirection:UISwipeGestureRecognizerDirectionRight];
[self.view addGestureRecognizer:swipeRight];

如果您需要对每个方向的滑动做出不同的反应，您应该为每个方向创建四个单独的手势识别器