// 每一个图片控件对象, 对一一对应 KNPhotoItems ,再将多个KNPhotoItems 对象放入数组
KNPhotoItems *items = [[KNPhotoItems alloc] init];
items.url = [urlArr[i] stringByReplacingOccurrencesOfString:@"thumbnail" withString:@"bmiddle"];
items.sourceView = imageView;

KNPhotoBrower *photoBrower = [[KNPhotoBrower alloc] init];
photoBrower.itemsArr = [_itemsArray copy];// KNPhotoItems对象的数组
photoBrower.currentIndex = tap.view.tag;// 当前点击的哪个图片
photoBrower.actionSheetArr = [self.actionSheetArray mutableCopy];//设置 ActionSheet的选项
[photoBrower present];// 显示

/* PhotoBrower 即将消失 */
- (void)photoBrowerWillDismiss;
/* PhotoBrower 右上角按钮的点击 */
- (void)photoBrowerRightOperationActionWithIndex:(NSInteger)index;
/* PhotoBrower 保存图片是否成功 */
- (void)photoBrowerWriteToSavedPhotosAlbumStatus:(BOOL)success;

/**
 * 是否需要右上角的按钮. Default is YES;
 */
@property (nonatomic, assign) BOOL isNeedRightTopBtn;
/**
 * 是否需要 顶部 1 / 9 控件 ,Default is YES
 */
@property (nonatomic, assign) BOOL isNeedPageNumView;
/**
 * 是否需要 底部 UIPageControl, Default is NO
 */
@property (nonatomic, assign) BOOL isNeedPageControl;
/**
 * 存放 ActionSheet 弹出框的内容 :NSString类型
 */
@property (nonatomic, strong) NSMutableArray *actionSheetArr;

#pragma mark - 右上角 按钮的点击
- (void)operationBtnIBAction{
 __weak typeof(self) weakSelf = self;

 if(_actionSheetArr.count != 0){ // 如果是自定义的 选项

  KNActionSheet *actionSheet = [[KNActionSheet alloc] initWithCancelBtnTitle:nil destructiveButtonTitle:nil otherBtnTitlesArr:[_actionSheetArr copy] actionBlock:^(NSInteger buttonIndex) {

   // 让代理知道 是哪个按钮被点击了
   if([weakSelf.delegate respondsToSelector:@selector(photoBrowerRightOperationActionWithIndex:)]){
    [weakSelf.delegate photoBrowerRightOperationActionWithIndex:buttonIndex];
   }

#warning 如果传入的 ActionSheetArr 有下载图片这一选项. 则在这里调用和下面一样的方法 switch.....,如果没有下载图片,则通过代理方法去实现... 目前不支持删除功能

  }];
  [actionSheet show];
 }else{
  KNActionSheet *actionSheet = [[KNActionSheet alloc] initWithCancelBtnTitle:nil destructiveButtonTitle:nil otherBtnTitlesArr:@[@"保存图片",@"转发微博",@"赞"] actionBlock:^(NSInteger buttonIndex) {

   // 让代理知道 是哪个按钮被点击了
   if([weakSelf.delegate respondsToSelector:@selector(photoBrowerRightOperationActionWithIndex:)]){
    [weakSelf.delegate photoBrowerRightOperationActionWithIndex:buttonIndex];
   }

   switch (buttonIndex) {
    case 0:{
     SDWebImageManager *mgr = [SDWebImageManager sharedManager];
     KNPhotoItems *items = _itemsArr[_currentIndex];
     if(![mgr diskImageExistsForURL:[NSURL URLWithString:items.url]]){
      [[KNToast shareToast] initWithText:@"图片需要下载完成"];
      return ;
     }else{
      UIImage *image = [[mgr imageCache] imageFromDiskCacheForKey:items.url];
      dispatch_async(dispatch_get_main_queue(), ^{
       UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
      });
     }
    }
    default:
     break;
   }
  }];
  [actionSheet show];
 }
}