iPhone SDK - 如何在 UINavigationController 中显示用相机拍摄的照片？

Question

这是我目前的代码：

/* class: myViewController
@interface myViewController: UIViewController
       <UIImagePickerControllerDelegate, UINavigationControllerDelegate>
*/
- (IBAction) getPicture {
    UIImagePickerController * picker = [[UIImagePickerController alloc] init];
       picker.delegate = self;
       picker.sourceType = UIImagePickerControllerSourceTypeCamera;
       [self presentModalViewController:picker animated:YES];
}

- (void) imagePickerController:(UIImagePickerController *)thePicker 
                    didFinishPickingMediaWithInfo:(NSDictionary *)imageInfo
{
    [[thePicker parentViewController] dismissModalViewControllerAnimated:YES];
       UIImage *img = [imageInfo
                           objectForKey:@"UIImagePickerControllerOriginalImage"];
    self.myImageView.image = img;
}

所以基本上我试图从 iPhone 相机中获取照片并将其显示在 UIImageView 中。只要类 myViewController 显示为独立视图，它就可以正常工作。如果我将视图放在 UINavigationController 中，则 UIImageView 在用相机拍摄后不会显示图像。但是，如果我从图书馆中选择一张图片，一切都会好起来的。

那么为什么 UIImageView 不会在 UINavigationController 中显示用相机拍摄的图像呢？

Answer 1

尝试切换以下几行：

[thePicker dismissModalViewControllerAnimated:YES];
UIImage *img = [imageInfo objectForKey:@"UIImagePickerControllerOriginalImage"];
self.myImageView.image = img;

到以下：

UIImage *img = [imageInfo objectForKey:@"UIImagePickerControllerOriginalImage"];
self.myImageView.image = img;
[thePicker dismissModalViewControllerAnimated:YES];

也许图像被释放是因为在你保留它之前关闭了视图

self.myImageView.image = img;

Answer 2

在我看来，您解散了错误的视图控制器。不应该：

[thePicker dismissModalViewControllerAnimated:YES];

阅读：

[self dismissModalViewControllerAnimated:YES];