Object-C block

/// 调用相册选择照片 ///
[menu addButtonWithTitle:NSLocalizedString(@"KeyFromAlbum", nil) block:onTouch_MenuItem];

/// 点击 相册 和 拍照 菜单选项代码块 ///
void (^onTouch_MenuItem)(NSUInteger) = ^(NSUInteger y) {
    //NSLog(@"%lu", (unsigned long)index); // ==> 1
    
    if (!imgPicker)
        imgPicker = [[UIImagePickerController alloc] init];
    
    imgPicker.sourceType = UIImagePickerControllerSourceTypeCamera;
};