iOS-图片的下载与存储 SDWebImage

SDWebImage加载图片 缓存逻辑

1、(SDImageCacheType) cacheType = SDImageCacheTypeNone  

2、(SDImageCacheType) cacheType = SDImageCacheTypeMemory

3、(SDImageCacheType) cacheType = SDImageCacheTypeDisk

4、(SDImageCacheType) cacheType = SDImageCacheTypeMemory



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