UIButton设置image上下左右位置 swift

iOS15：比较简单了(苹果为啥到了iOS15才想起来按钮还需要这个功能呢)。Button新增UIButton.Configuration用来配置

 if #available(iOS 15.0, *) {
    var config = UIButton.Configuration.plain()
    ///这里imagePlacement图片的位置 .leading .trailing .bottom .top
    config.imagePlacement = .top
    config.imagePadding = 10
    config.image = UIImage(named: "imgname")
    testButton.configuration = config
 }