使用 UIImagePickerController 选择图像后，照片库视图保留在屏幕上

Question

当我通过 UIImagePickerController 界面从照片库中选择一张图片后，即使我在 imagePickerController:didFinishPickingImage:editingInfo 中调用了 dismissModelViewControllerAnimated ，照片库视图仍会保持显示。

有人见过这个吗？ 这些是我正在使用的三个相关方法：

- (IBAction)choosePictureFromLibrary:(id)sender {
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
        UIImagePickerController* picker = [[UIImagePickerController alloc] init];
        picker.delegate = self;
        picker.allowsImageEditing = YES;
        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        [self presentModalViewController:picker animated:YES];
        [picker release];
    }
    else {
        UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"Error accessing Photo Library" message:@"This device does not support a Photo Library." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [alert release];
    }
}


- (void)imagePickerController:(UIImagePickerController*)picker didFinishPickingImage:(UIImage*)image editingInfo:(NSDictionary*)editingInfo {   
    UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"Picture picked!" message:@"You picked a picture!" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];
    [alert release];

    [picker dismissModalViewControllerAnimated:YES];
}


- (void)imagePickerControllerDidCancel:(UIImagePickerController*)picker {   
    [picker dismissModalViewControllerAnimated:YES];
}

我本以为调用 imagePickerController:didFinishPickingImage:editingInfo 会完全关闭照片库视图，但似乎并非如此。 我还需要做些什么才能让它消失吗？

Answer 1

您需要访问选择器的 viewController 而不是选择器本身。 试试这条线。

[[picker parentViewController] dismissModalViewControllerAnimated:YES];

Answer 2

您只需调用即可

[self dismissModalViewControllerAnimated:YES];

关闭当前视图顶部的任何模式视图控制器。

这是有道理的，因为您通过调用来呈现视图控制器：

[self presentModalViewController:picker animated:YES];

Answer 3

只是对此答案的更新

 [self dismissModalViewControllerAnimated:YES];

已在 iOS 6.0 中弃用，因此您现在需要使用。

 [self dismissViewControllerAnimated:YES completion:nil];

这不是一个巨大的变化，但对于任何看到这个问题并且使用 iOS 6.0 的人来说，他们将需要更新的答案。

 [self presentModalViewController:filePicker animated:YES];

也已被弃用，取而代之的是

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