iOS_Swift初识之使用三种回调方式自定义Button

最近在学习Swift ,发现青玉伏案大神早期用OC写的一篇博客--IOS开发之自定义Button(集成三种回调模式)  很适合用来熟悉Swift的回调方式，于是我就用Swift翻版了一下，具体实现原理就不多说了，主要贴上Swift的代码给大家看看。由于刚开始了解Swift，有使用不恰当的地方请轻拍。。。。

上代码：

1、新建一个xib，拖一个UIView到界面上，绑定上自定义的UIView类，拖一个UILabel到view上，写上Button假装是个UIButton；并将label拖到代码当中

2、我这里回调三种Button点击事件，TouchDown、TouchUpInside、TouchUpOutside

A、首先是Target：

a、首先声明一个枚举来设定点击类型

    enum MyControlEvents{
    case TouchUpInside
    case TouchUpOutside
    case TouchDown
}

b、设置Target、action和Event三个属性

    //声明三个属性、添加一个addTarget方法，注意Target和delegate一样要用weak修饰
    weak var target:AnyObject?
    var action:Selector?
    var controlEvents:MyControlEvents?

    func addTarget(target:AnyObject!, action: Selector!, forMyControlEvents controlEvents: MyControlEvents! ){
        self.target = target
        self.action = action
        self.controlEvents = controlEvents
    }

c、在touch事件的代理里面实现Target方法、并把label的颜色改改，这样才像button，我把代理方法写在了extension延展里面，因为我见苹果都这样

extension MyViewButton{

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

        self.titleLabel.textColor = UIColor.lightGrayColor()

        if self.controlEvents == MyControlEvents.TouchDown{
            self.target?.performSelector(self.action!, withObject: self)
        }
    }

    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {

        self.titleLabel.textColor = UIColor.blueColor()

        //let point:CGPoint = (touches as NSSet).anyObject()!.locationInView(self)、下面方法的合体
        let view = (touches as NSSet).anyObject()
        let point:CGPoint = view!.locationInView(self)
        //判断Target类型和触摸点移出情况相匹配时执行target方法
       if CGRectContainsPoint(self.bounds, point) && self.controlEvents == MyControlEvents.TouchUpInside{
            self.target?.performSelector(self.action!, withObject: self)
        }else if !CGRectContainsPoint(self.bounds, point) && self.controlEvents == MyControlEvents.TouchUpOutside{
            self.target?.performSelector(self.action!, withObject: self)
        }
}

d、在VC中实现，选择不同的点击类型即可监控不同的点击事件啦

    class ViewController: UIViewController , MyViewButtonDelegate {

    var myButton:MyViewButton?

    override func viewDidLoad() {
        super.viewDidLoad()
        //从xib中加载我们自定义的view，我的xib叫做“View”
        let bundel:NSBundle = NSBundle.mainBundle()
        let views:Array = bundel.loadNibNamed("View", owner: nil, options: nil)

        self.myButton = views.last as? MyViewButton
        self.myButton?.frame = CGRectMake(80, 200, 200, 100)

        self.view.addSubview(self.myButton!)

        self.myButton?.addTarget(self, action: Selector!("didTapButton:"), forMyControlEvents: MyControlEvents.TouchUpInside)
}

最后 实现点击方法即可

func didTapButton(button:MyViewButton){
        print("VC点击了按钮---点击类型是\(button.controlEvents)")
    }

 B、协议

1、声明一个protocol，里面有三个可选实现的方法，并把自身当做参数带出去

    objc protocol MyViewButtonDelegate:NSObjectProtocol{
    optional func didTouchMyButton(button:MyViewButton)
    optional func didTouchUpInsideButton(button:MyViewButton)
    optional func didTouchUpOutsideButton(button:MyViewButton)
}

2、声明一个delegate属性，同样是弱指针引用

    weak var delegate:MyViewButtonDelegate!

3、同样在touch事件中实现

    extension MyViewButton{
    //调用协议方法时判断一下delegate和协议方法是否存在
    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

        self.titleLabel.textColor = UIColor.lightGrayColor()
        if self.delegate != nil && self.delegate!.respondsToSelector("didTouchMyButton:"){
            self.delegate?.didTouchMyButton!(self)
        }
    }

    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {

        self.titleLabel.textColor = UIColor.blueColor()

        //let point:CGPoint = (touches as NSSet).anyObject()!.locationInView(self)
        let view = (touches as NSSet).anyObject()
        let point:CGPoint = view!.locationInView(self)

        if CGRectContainsPoint(self.bounds, point){
            if self.delegate != nil && self.delegate!.respondsToSelector("didTouchUpInsideButton:"){
                self.delegate?.didTouchUpInsideButton!(self)
            }
        }else{
            if self.delegate != nil && self.delegate!.respondsToSelector("didTouchUpOutsideButton:"){
                self.delegate?.didTouchUpOutsideButton!(self)
            }
        }
    }
}

4、在VC中实现即可

    class ViewController: UIViewController , MyViewButtonDelegate {
 override func viewDidLoad() {
        super.viewDidLoad()

        let bundel:NSBundle = NSBundle.mainBundle()
        let views:Array = bundel.loadNibNamed("View", owner: nil, options: nil)

        self.myButton = views.last as? MyViewButton
        self.myButton?.frame = CGRectMake(80, 200, 200, 100)

        self.view.addSubview(self.myButton!)
        //设置button的代理
        self.myButton!.delegate = self
}

extension ViewController{
    //实现代理方法
    func didTouchMyButton(button: MyViewButton) {
        print("delegate--VC点击了button")
    }
    func didTouchUpInsideButton(button: MyViewButton) {
        print("delegate--TouchUpInside")
    }

    func didTouchUpOutsideButton(button: MyViewButton) {
        print("delegate--TouchUpOutside")
    }

}

 C、闭包(block)

1、首先在自定义view里实现，相当于typedef一个block类型

typealias MyBlock = (button:MyViewButton)->Void

2、声明三个block属性，并且声明三个给block赋值方法

    var TouchBlockHandel:MyBlock?
    var TouchUpInsideBlockHandel:MyBlock?
    var TouchUpOutsideBlockHandel:MyBlock?
    //也可以不写方法直接属性赋值
    func setMyTouchBlock(block:MyBlock){
        self.TouchBlockHandel = block
    }
    func setMyTouchUpInsideBlock(block:MyBlock){
        self.TouchUpInsideBlockHandel = block
    }
    func setMyTouchUpOutsideBlock(block:MyBlock){
        self.TouchUpOutsideBlockHandel = block
    }

3、在touch事件中实现block

    extension MyViewButton{

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        self.titleLabel.textColor = UIColor.lightGrayColor()
        self.TouchBlockHandel!(button: self)
    }

    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {

        self.titleLabel.textColor = UIColor.blueColor()

        //let point:CGPoint = (touches as NSSet).anyObject()!.locationInView(self)
        let view = (touches as NSSet).anyObject()
        let point:CGPoint = view!.locationInView(self)

        if CGRectContainsPoint(self.bounds, point){
        self.TouchUpInsideBlockHandel!(button: self)
        }else{
        self.TouchUpOutsideBlockHandel!(button: self)
        }
}

4、同样在VC中给三个block赋值即可

    class ViewController: UIViewController , MyViewButtonDelegate {

    var myButton:MyViewButton?

    override func viewDidLoad() {
        super.viewDidLoad()

        let bundel:NSBundle = NSBundle.mainBundle()
        let views:Array = bundel.loadNibNamed("View", owner: nil, options: nil)

        self.myButton = views.last as? MyViewButton
        self.myButton?.frame = CGRectMake(80, 200, 200, 100)

        self.view.addSubview(self.myButton!)

        self.myButton?.setMyTouchBlock({ (button:MyViewButton) -> Void in
            print("block--VC点击了button")
        })
        self.myButton?.setMyTouchUpInsideBlock({ (button:MyViewButton) -> Void in
            print("block--VCTouchUpInside")
        })
        self.myButton?.setMyTouchUpOutsideBlock({ (button:MyViewButton) -> Void in
            print("block--VCTouchUpOutside")
        })
    }

}

最后来看看三个方法写在一起的打印结果。就添加了一个target监控TouchUpInside。总体来说和OC逻辑没有任何变化，只是语法上有所不同，block还是好用

好了，这样就结束了，今天下雪了，大家注意保暖！