寫(xiě)在前面吧：
現(xiàn)目前是這樣的：有數(shù)量不等的圖片需要瀑布流顯示棕兼，每張圖片高寬度各有不同
初步思路：根據(jù)上述問(wèn)題需求障斋，可知贞瞒，使用表視圖為最佳方式
關(guān)鍵: 圖片高寬度不定，cell需要?jiǎng)討B(tài)計(jì)算高度摆寄；圖片需做縮放處理失暴，適應(yīng)屏幕
使用SDWebImage下載圖片

思路就如上所述，具體代碼如下：

1微饥、計(jì)算cell高度(前提是已做好數(shù)據(jù)請(qǐng)求處理)

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    // 先從緩存中查找圖片
    UIImage *image = [[SDImageCache sharedImageCache] imageFromDiskCacheForKey:self.sdwebArr[indexPath.row]];
    if (!image) {
        image = [UIImage imageNamed:@"store_no_data"];
    }
    //H = H*(SCREEN_WIDTH/W) = 高度*(屏幕/圖片寬)
    CGFloat imageHeight = image.size.height * SCREEN_WIDTH/image.size.width;
    return imageHeight;
}

2逗扒、cellForRowAtIndexPath(調(diào)用configureCell: atIndexPath:方法)

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    ShopDetailCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseIdentifier];
    if (cell == nil) {
        cell = [[ShopDetailCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuseIdentifier];
    }
    [self configureCell:cell atIndexPath:indexPath];

    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    return cell;
}

3、調(diào)用(downloadImage: forIndexPath:)

- (void)configureCell:(ShopDetailCell *)cell atIndexPath:(NSIndexPath *)indexPath {
    NSString *imgURL = self.sdwebArr[indexPath.row];
    UIImage *cachedImage = [[SDImageCache sharedImageCache]imageFromDiskCacheForKey:imgURL];
    
    if (!cachedImage) {
        [self downloadImage:self.sdwebArr[indexPath.row] forIndexPath:indexPath];

    }else{
        [cell.imgBtn setBackgroundImage:cachedImage forState:UIControlStateNormal];
    }
}

4欠橘、下載對(duì)應(yīng)圖片矩肩、使用GCD回到主線程刷新UI

- (void)downloadImage:(NSString *)imageURL forIndexPath:(NSIndexPath *)indexPath {
    [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:[NSURL URLWithString:imageURL] options:SDWebImageDownloaderUseNSURLCache progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
        //nothing to do
    } completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {
        [[SDImageCache sharedImageCache] storeImage:image forKey:imageURL toDisk:YES completion:^{
            
        }];
        dispatch_async(dispatch_get_main_queue(), ^{
            [self.detailTableView reloadData];
        });
    }];
}

結(jié)束語(yǔ)：
感謝icefishlily的blog
當(dāng)你以為你已經(jīng)夠努力時(shí)，你總會(huì)遇到更優(yōu)秀的人肃续，見(jiàn)到更不可思議的風(fēng)景黍檩。
諸君叉袍，共勉之～