UIImagePickerController的正确发布

Question

我对此有点困惑，因为我已经看到太多不同的变体，并且不确定哪一个是正确的方式。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]; 
} 

我在第一种方法分配UIImagePickerController，但不会是合乎逻辑的，只在第2个方法，当我关闭它释放？

Answer 1

不，因为它通过presentModelViewController以模态方式呈现时保留。这是您在展示新视图控制器时会发现的常见模式，无论是否使用模态，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]; 
}