button.imageEdgeInsets = UIEdgeInsetsMake(0, labelWidth, 0, -labelWidth);button.titleEdgeInsets = UIEdgeInsetsMake(0, -imageWith, 0, imageWith);
获取图片宽度：CGFloat imageWidth = button.imageView.bounds.size.width;
原文：http://www.cnblogs.com/wlsxmhz/p/5462754.html