打开相册另类写法

- (IBAction)actionPhoto:(id)sender
//-------------------------------------------------------------------------------------------------------------------------------------------------
{
    PresentPhotoLibrary(self, YES);
}

#pragma mark - UIImagePickerControllerDelegate

//-------------------------------------------------------------------------------------------------------------------------------------------------
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
//-------------------------------------------------------------------------------------------------------------------------------------------------
{………………}

//-------------------------------------------------------------------------------------------------------------------------------------------------
BOOL PresentPhotoLibrary(id target, BOOL canEdit)
//-------------------------------------------------------------------------------------------------------------------------------------------------
{
    if (([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary] == NO
         && [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum] == NO)) return NO;
    //---------------------------------------------------------------------------------------------------------------------------------------------
    NSString *type = (NSString *)kUTTypeImage;
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    //---------------------------------------------------------------------------------------------------------------------------------------------
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]
        && [[UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypePhotoLibrary] containsObject:type])
    {
        imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        imagePicker.mediaTypes = [NSArray arrayWithObject:type];
    }
    else if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum]
             && [[UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeSavedPhotosAlbum] containsObject:type])
    {
        imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
        imagePicker.mediaTypes = [NSArray arrayWithObject:type];
    }
    else return NO;
    //---------------------------------------------------------------------------------------------------------------------------------------------
    imagePicker.allowsEditing = canEdit;
    imagePicker.delegate = target;
    [target presentViewController:imagePicker animated:YES completion:nil];
    //---------------------------------------------------------------------------------------------------------------------------------------------
    return YES;
}