iOS_Swift初识之使用三种回调方式自定义Button-白红宇

iOS_Swift初识之使用三种回调方式自定义Button

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发布时间：2019-06-27

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最近在学习Swift ,发现青玉伏案大神早期用OC写的一篇博客-- 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
     
      , 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
      
       , 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
     
      , 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
      
       , 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
     
      , withEvent event: UIEvent?) {        self.titleLabel.textColor = UIColor.lightGrayColor()        self.TouchBlockHandel!(button: self)    }    override func touchesEnded(touches: Set
      
       , 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！

转载于:https://www.cnblogs.com/xiaoqiuge/p/4943776.html

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