SDWebImage解读解读
文章目录文章目录类 方法 协议 分类解析SDWebImageOperation NSOperation的分类UIImageView+WebCache UIImageView分类
UIView+WebCache UIView分类UIView+WebCacheOperation UIView分类SDWebImageCombinedOperation 继承自
NSObjectSDWebImageManagerSDWebImageManagerDelegateSDImageCache 协议SDImageLoader 协议
SDWebImageDownloader 下载类，此分类遵循SDImageLoader协议SDWebImageDownloadToken 每一个下载的关联对象，
可以取消下载操作 遵循SDWebImageOperation协议SDWebImageDownloaderOperation 下载工具类
SDImageCachesManager 缓存管理类 遵循 SDImageCache 协议SDImageCache 维护内存缓存和磁盘缓存SDMemoryCache
内存缓存类 继承NSCacheSDDiskCache 磁盘缓存类 继承NSObject总结
此部分会省略一些代码，请知晓 SD下载地址
类类 方法方法 协议协议 分类解析分类解析
SDWebImageOperation NSOperation的分类的分类
是NSOperation分类 遵循SDWebImageOperation 协议
@protocol SDWebImageOperation
- (void)cancel;
@end
@interface NSOperation (SDWebImageOperation)
@end
UIImageView+WebCache UIImageView分类分类
// 采用SDWebImage对UIImageView的对象加载图片的方法都会调用此方法
- (void)sd_setImageWithURL:(nullable NSURL *)url
placeholderImage:(nullable UIImage *)placeholder
options:(SDWebImageOptions)options
context:(nullable SDWebImageContext *)context
progress:(nullable SDImageLoaderProgressBlock)progressBlock
completed:(nullable SDExternalCompletionBlock)completedBlock {
// UIView+WebCache 内部方法
[self sd_internalSetImageWithURL:url
placeholderImage:placeholder
options:options
context:context
setImageBlock:nil
progress:progressBlock
completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL *
_Nullable imageURL) {
if (completedBlock) {
completedBlock(image, error, cacheType, imageURL);
}
}];
UIView+WebCache UIView分类分类
因为此方法需要在需要在 UIButton 和 UIImageView 上重用 所以添加到它们的根类上
- (void)sd_internalSetImageWithURL:(nullable NSURL *)url
placeholderImage:(nullable UIImage *)placeholder
options:(SDWebImageOptions)options
context:(nullable SDWebImageContext *)context
setImageBlock:(nullable SDSetImageBlock)setImageBlock
progress:(nullable SDImageLoaderProgressBlock)progressBlock
completed:(nullable SDInternalCompletionBlock)completedBlock {
context = [context copy]; // copy to avoid mutable object
NSString *validOperationKey = context[SDWebImageContextSetImageOperationKey];
// SDOperationsDictionary对象中取出当前key对应的对象并取消所有操作 不会影响之后进行的下载操作
[self sd_cancelImageLoadOperationWithKey:validOperationKey];
if (!(options & SDWebImageDelayPlaceholder)) {
dispatch_main_async_safe(^{
[self sd_setImage:placeholder imageData:nil basedOnClassOrViaCustomSetImageBlock:setImageBlock cacheType:SDImageCacheTypeNone
imageURL:url];
});
}
if (url) {
SDWebImageManager *manager = context[SDWebImageContextCustomManager];
if (!manager) {
manager = [SDWebImageManager sharedManager];
}
SDImageLoaderProgressBlock combinedProgressBlock = ^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
if (imageProgress) {
imageProgress.totalUnitCount = expectedSize;
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