//使用一下titleLabel和imageView,目的是为了准确的获取tittle的size
button.titleLabel.backgroundColor = button.backgroundColor;
button.imageView.backgroundColor = button.backgroundColor;
//获取size (精确的)
CGSize titleSize = button.titleLabel.bounds.size;
CGSize imageSize = button.imageView.bounds.size;
CGFloat interval = 2.0;
//交换图片和文字的左右位置
button.imageEdgeInsets = UIEdgeInsetsMake(0,titleSize.width + interval, 0, -(titleSize.width + interval));
button.titleEdgeInsets = UIEdgeInsetsMake(0, -(imageSize.width + interval), 0, imageSize.width + interval);
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