iOS清理缓存的简单实现

//清除缓存
//使用 SDWebimage 的方法自动计算有多少图片

+ (void)clearImageCache {
//获取缓存
float tmpSize = [[SDImageCachesharedImageCache]getSize]/(1024*1024);
//清除缓存
[[SDImageCachesharedImageCache]clearDiskOnCompletion:^{
NSString *clearCacheName = tmpSize >=1 ? [NSStringstringWithFormat:@"清理缓存(%.2fM)",tmpSize]
: [NSStringstringWithFormat:@"清理缓存(%.2fK)",tmpSize *1024];

//清理提示
[[[UIAlertViewalloc]initWithTitle:nil
message:clearCacheName
delegate:nil
cancelButtonTitle:@"好的"
otherButtonTitles:nil]show];
}];
}