开发中用到UITableView默认的cell.imageView,有时从接口获取的图片大小不合适，如下图：

需要调整cell.imageview.image的大小

   cell.imageView.image = [UIImage imageNamed:[NSString      stringWithFormat:@"%@",_imageArr[indexPath.row]]];

    CGSize itemSize = CGSizeMake(35, 35);

   UIGraphicsBeginImageContextWithOptions(itemSize,NO,UIScreen.mainScreen.scale);

    CGRect imageRect = CGRectMake(0, 0, itemSize.width, itemSize.height);

    [cell.imageView.image drawInRect:imageRect];

   cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

调整后如下图：