Swift4.0 便利构造函数的写法

在UIButton 类扩展中添加新的便利构造函数如下：

代码语言：javascript复制

extension UIButton {
    
    convenience init(composeForeImageName:String,composeBackImageName:String){
        self.init()
        setImage(UIImage.init(named: composeForeImageName), for: .normal)
        setBackgroundImage(UIImage.init(named: composeBackImageName), for: .normal)
        setBackgroundImage(UIImage.init(named: composeBackImageName "_highlighted"), for: .selected)
        sizeToFit()
    }
    
}

调用：调用的时候就会出现新的构造函数，方便便捷。

代码语言：javascript复制

  //MARK:属性 懒加载
    lazy var composeBtn = UIButton(composeForeImageName: "tabbar_compose_icon_add", composeBackImageName: "tabbar_compose_button")

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