UITableView加载网络图片 cell适应图片高度
一、自定义cell.xib上拖拽一个imageView
上下左右贴边约束,连线属性
cell.h@property (strong, nonatomic) IBOutlet UIImageView *imgView;
二、在VC.m 中根据图片尺寸设置cell高度
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return self.picAdrVOS.count;}- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{ // 先从缓存中查找图片 NSString *imgURL = self.picAdrVOS[indexPath.row].imgUrl; UIImage *image = [[SDImageCache sharedImageCache] imageFromDiskCacheForKey:imgURL]; if (!image) { return 0; } //手动计算cell CGFloat imgHeight = image.size.height * kScreenWidth / image.size.width; return imgHeight;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { YBMImgTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"YBMImgTableViewCell" forIndexPath:indexPath]; [self configureCell:cell atIndexPath:indexPath]; …… return cell;}//加载图片- (void)configureCell:(YBMImgTableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath { YBMShopHomePicModel *model = self.picAdrVOS[indexPath.row]; UIImage *cachedImage = [[SDImageCache sharedImageCache] imageFromDiskCacheForKey:model.imgUrl]; if (!cachedImage ) { [self downloadImage:model.imgUrl]; } else { cell.imgView.image = cachedImage; }}- (void)downloadImage:(NSString *)imageURL{ // 利用 SDWebImage 框架提供的功能下载图片 [[SDWebImageDownloader sharedDownloader]downloadImageWithURL:[NSURL URLWithString:imageURL] options:SDWebImageDownloaderUseNSURLCache progress:^(NSInteger receivedSize, NSInteger expectedSize) { } completed:^(UIImage *image, NSData *data, NSError *error, BOOL finished) { [[SDImageCache sharedImageCache]storeImage:image forKey:imageURL toDisk:YES]; // ⚠️必须判断有图片才刷新,避免因加载失败而引起死循环! if(image) { dispatch_async(dispatch_get_main_queue(), ^{ [self.tableView reloadData]; }); } }];}
这样就可以实现效果啦。
⚠️⚠️⚠️注意:加载图片失败时,必须判断有图片才刷新tableView,避免因图片加载失败而引起死循环!
来源地址:https://blog.csdn.net/biyuhuaping/article/details/123133223