swift4 UIButton

//初始化

letmyBtn =UIButton.init(type: .custom)

myBtn.backgroundColor = UIColor.brown

myBtn.frame= .init(x:30, y:30, width:100, height:40)

myBtn.setTitle("带图片的按钮", for: .normal)

//按钮内容的边距（顶部，左边，底部，左边）

myBtn.contentEdgeInsets= (UIEdgeInsets.init(top:20, left:-20, bottom:0, right:0))

//按钮上文本框的边距

myBtn.titleEdgeInsets=UIEdgeInsetsMake(5,0,10,0)

//设置按钮UIImageView上的图片

myBtn.setImage(UIImage.init(named:"icon"), for: .normal)

//设置按钮背景上的图片

 myBtn.setBackgroundImage(UIImage.init(named:"iconBg"), for: .normal)

//按钮上图片的边距

myBtn.imageEdgeInsets=UIEdgeInsetsMake(10,0,20,0)

//高亮状态下变灰

myBtn.showsTouchWhenHighlighted = true

 self.view.addSubview(myBtn)

letmyBtn2 =UIButton.init(frame: .init(x:30, y:130, width:100, height:40))

 myBtn2.backgroundColor=UIColor.init(white:0.9, alpha:1)

self.view.addSubview(myBtn2)

//设置按钮的文字和文字的颜色

//普通状态

myBtn2.setTitle("普通", for:UIControlState.normal)

myBtn2.setTitleColor(UIColor.blue, for: .normal)

//高亮状态

myBtn2.setTitle("高亮", for:.highlighted)

myBtn2.setTitleColor(.red, for: .highlighted)

//添加点击事件

myBtn2.addTarget(self, action:#selector(action_btn(btn:)), for: .touchUpInside)

@objcfuncaction_btn(btn:UIButton) -> () {

        print("点击\(btn.currentTitle!)")

    }