UIButton 继承自UIControl,所以可以对UIControlContentHorizontalAlignment进行设置
btn.setImage(UIImage.init(named: "unSelected"), for: UIControl.State.normal)
btn.setImage(UIImage.init(named: "selected"), for: UIControl.State.selected)
btn.contentHorizontalAlignment = .right
https://blog.youkuaiyun.com/timtian008/article/details/53611744
博客指出UIButton继承自UIControl,可对UIControlContentHorizontalAlignment进行设置,还给出了相关参考链接。
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