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。