APP中的清除缓存

APP中一般计算缓存大小 是通过SDWebImage计算的：

    float tmpSize = [[SDImageCache sharedImageCache] getSize];

   NSString *clearCacheName = tmpSize >= 1 ? [NSString stringWithFormat:@"%.1fMB",tmpSize/(1024*1024)] : [NSString stringWithFormat:@"%.1fKB",tmpSize * 1024];

self.clearCacheName = clearCacheName;

清理缓存

MBProgressHUD *hud = [[MBProgressHUD alloc] init];
    [[[UIApplication sharedApplication].windows firstObject] addSubview:hud];
    //加载条上显示文本
    hud.labelText = @"急速清理中";
    //置当前的view为灰度
    hud.dimBackground = YES;
    //设置对话框样式
    hud.mode = MBProgressHUDModeDeterminate;
    [hud showAnimated:YES whileExecutingBlock:^{
        while (hud.progress < 1.0) {
            hud.progress += 0.01;
            [NSThread sleepForTimeInterval:0.02];
        }
        hud.labelText = @"清理完成";
    } completionBlock:^{
        [[SDImageCache sharedImageCache] clearDisk];
        [[SDImageCache sharedImageCache] clearMemory];
        block_self.clearCacheName = @"0.0KB";
      
        [hud removeFromSuperview];
    }];