Ios4 正确释放UIImagePickerController

我对此有点困惑，因为我看到了太多不同的变体，不确定哪一种是正确的。目前我有：

- (IBAction)pickImageFromLibrary:(id)sender
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];

    picker.delegate = self;
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    [self presentModalViewController:picker animated:YES];

    //  [picker release];
}

- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{   
    UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];

    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0.0f, 10.0f, 320.0f, 264.0f)];

    self.studyView = imageView;

    [imageView release];

    [self.tableView setTableHeaderView:studyView];

    self.fitImage = [ImageHelper image:image fitInView:studyView];

    if (picker.sourceType == UIImagePickerControllerSourceTypeCamera)
    {
        UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
    }

    studyView.image = self.fitImage;

    [self dismissModalViewControllerAnimated:YES];

    [picker release];
 }

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我在第一种方法中分配了

UIImagePickerController

，但在第二种方法中，当我关闭它时，只释放它不是合乎逻辑的吗？

否，因为它在通过

presentModelViewController

以模式显示时被保留。这是在显示新视图控制器时常见的模式，无论是模式视图控制器还是自定义视图控制器。这很好：

- (IBAction)pickImageFromLibrary:(id)sender
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];

    picker.delegate = self;
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    [self presentModalViewController:picker animated:YES];

    [picker release];
}

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很酷，谢谢。这意味着我不需要didFinishPickingMediaWithInfo one中的版本：）