SDwebImage

 // 利用SDWebImage给按钮设置image

    [self sd_setImageWithURL:[NSURL URLWithString:icon] forState:UIControlStateNormal];

 

//缓存大小

 CGFloat size = [SDImageCache sharedImageCache].getSize / 1000.0 / 1000;

  cell.textLabel.text = [NSString stringWithFormat:@"清除缓存（已使用%.2fMB）", size];

//清除缓存

 [[SDImageCache sharedImageCache] clearDisk];