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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

iOS_Swift初识之使用三种回调方式自定义Button