ios cell.imageview大小修改

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      cell imageview的属性是readonly 

所以不可变更

可以用这种方法改

 UIImage *icon = [UIImage imageNamed:@"head_Icon"];

        CGSize itemSize = CGSizeMake(30, 30);

        UIGraphicsBeginImageContextWithOptions(itemSize, NO,0.0);

        CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);

        [icon drawInRect:imageRect];

        cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();