Question

关闭相机后。它给了我这个警告：在演示文稿正在进行时尝试演示！

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [self dismissViewControllerAnimated:YES completion:nil];
}

我不知道这是不是一个大问题。

更多代码：

- (void) viewWillAppear:(BOOL)animated
{
    [self takePicture];
}


- (void) takePicture
{
    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        [imagePickerController setSourceType:UIImagePickerControllerSourceTypeCamera];
    } else
        [imagePickerController setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];

    imagePickerController.delegate = self;
    [self presentViewController:imagePickerController animated:YES completion:nil];
}


- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [self dismissViewControllerAnimated:NO completion:nil];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [self dismissViewControllerAnimated:NO completion:nil];
}

顺便说一下，“dismissModalViewController”已被弃用。

修正：一旦有新视图，将调用ViewWillAppear。这就是问题

Answer 1

您不应该从viewWillAppear呈现任何控制器，因为当前视图控制器的呈现尚未完成。

从viewDidAppear调用takePicture，因为一旦控制器的显示完成，将调用viewDidAppear。

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

希望这会对你有所帮助。

Answer 2

您可能已经提供了一些像这样的视图控制器

[self presentViewController:someVC animated:YES completion:nil];

在动画完成之前，您的下面方法称为

imagePickerControllerDidCancel

您可以将其更改为

进行检查

[self presentViewController:someVC animated:NO completion:nil];

注意动画：上面没有。

警告：在演示文稿正在进行时尝试显示uiimagepickercontroller

2 个答案: