SDWebImage for iOS « flashisobar's Blog

SDWebImage 預設是暴力快取。

只要載入過的圖檔都會被強制快取在本地端，
除非把程式移除，不然不會更新快取。
優點是效能非常好，就算離線狀態也能顯示。
缺點是當圖檔更新的時候，不會跟著更新。

[uiimageview setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://lorempixel.com/400/200/cats/%d", 1+indexPath.row%9]] placeholderImage:[UIImage imageNamed:@"previewholder"]];

SDWebImageRefreshCached: 依照 HTTP Caching Control Header 來更新圖檔。

[uiimageview setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://lorempixel.com/400/200/cats/%d", 1+indexPath.row%9]] placeholderImage:[UIImage imageNamed:@"previewholder"] options:SDWebImageRefreshCached];

To clean both memory and disk cache.

SDImageCache *imageCache = [SDImageCache sharedImageCache];
[imageCache clearMemory];
[imageCache clearDisk];
[imageCache cleanDisk];