1、常用的方法
//常用方法一
- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder;
//例如：
NSURL *url = [NSURL URLWithString:app.icon];
UIImage *placeholder = [UIImage imageNamed:@"placeholder"];
[cell.imageView sd_setImageWithURL:url placeholderImage:placeholder];
//常用方法二
//参数三：SDWebImageOptions
//SDWebImageRetryFailed ：下载失败后，会重新继续下载
//SDWebImageLowPriority ：正在进行UI交互操作时，停止内部的下载操作
- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options;
//例如
SDWebImageOptions options = SDWebImageRetryFailed | SDWebImageLowPriority;
[cell.imageView sd_setImageWithURL:url placeholderImage:placeholder options:options];
//常用方法三
- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder completed:(SDWebImageCompletionBlock)completedBlock;
//例如：
[cell.imageView sd_setImageWithURL:url placeholderImage:placeholder completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
NSLog(@"----图片加载完毕---%@", image);
}];
//常用方法四
- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options progress:(SDWebImageDownloaderProgressBlock)progressBlock completed:(SDWebImageCompletionBlock)completedBlock ;
//例如：
SDWebImageOptions options = SDWebImageRetryFailed | SDWebImageLowPriority;
[cell.imageView sd_setImageWithURL:url placeholderImage:placeholder options:options progress:^(NSInteger receivedSize, NSInteger expectedSize) { // 这个block可能会被调用多次
NSLog(@"下载进度：%f", (double)receivedSize / expectedSize);
} completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
NSLog(@"----图片加载完毕---%@", image);
}];
2、内存处理，当app收到内存警告时
//该方法写在AppDelegate.m文件中
- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application
{
SDWebImageManager *mgr = [SDWebImageManager sharedManager];
// 1.取消正在下载的操作
[mgr cancelAll];
// 2.清除内存缓存
[mgr.imageCache clearMemory];
}
