//1.创建
letbutton =UIButton(type:.custom)
button.frame=CGRect(x:200,y:200,width:70,height:40)
view.addSubview(button)
//2.设置标题
button.setTitle("呵呵", for: .normal)
button.setTitle("哈哈", for: .highlighted)
//3.选中
button.isSelected=false
//4.设置背景颜色
button.backgroundColor=UIColor.cyan
//5.设置背景图片
button.setBackgroundImage(UIImage(named:"backImage"), for: .normal)
button.setBackgroundImage(UIImage(named:"backHightImage"), for: .highlighted)
//6.设置图片
button.setImage(UIImage(named:"image"), for: .normal)
button.setImage(UIImage(named:"hightImage"), for: .highlighted)
//7.设置标题颜色
button.setTitleColor(UIColor.black, for: .normal);
button.setTitleColor(UIColor.red, for: .highlighted)
//8.设置标题文字大小
button.titleLabel?.font=UIFont.systemFont(ofSize:18)
//9.添加点击响应事件
button.addTarget(self, action:#selector(buttonAction), for: .touchUpInside)
//10.响应事件方法
