iOS_Swift初識之使用三種回調方式自訂Button

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最近在學習Swift ,發現青玉伏案大神早期用OC寫的一篇部落格--IOS開發之自訂Button(整合三種回調模式)  很適合用來熟悉Swift的回調方式，於是我就用Swift翻版了一下，具體實現原理就不多說了，主要貼上Swift的代碼給大家看看。由於剛開始瞭解Swift，有使用不恰當的地方請輕拍。。。。

 

上代碼：

1、建立一個xib，拖一個UIView到介面上，綁定上自訂的UIView類，拖一個UILabel到view上，寫上Button假裝是個UIButton；並將label拖到代碼當中

2、我這裡回調三種Button點擊事件，TouchDown、TouchUpInside、TouchUpOutside

A、首先是Target：

a、首先聲明一個枚舉來設定點擊類型

    enum MyControlEvents{    case TouchUpInside    case TouchUpOutside    case TouchDown}

 

b、設定Target、action和Event三個屬性

    //聲明三個屬性、添加一個addTarget方法，注意Target和delegate一樣要用weak修飾    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事件的代理裡面實現Target方法、並把label的顏色改改，這樣才像button，我把代理方法寫在了extension延展裡面，因為我見蘋果都這樣

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)、下面方法的合體        let view = (touches as NSSet).anyObject()        let point:CGPoint = view!.locationInView(self)        //判斷Target類型和觸摸點移出情況相匹配時執行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中實現，選擇不同的點擊類型即可監控不同的點擊事件啦

    class ViewController: UIViewController , MyViewButtonDelegate {        var myButton:MyViewButton?        override func viewDidLoad() {        super.viewDidLoad()        //從xib中載入我們自訂的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)}    

 

最後 實現點擊方法即可

func didTapButton(button:MyViewButton){        print("VC點擊了按鈕---點擊類型是\(button.controlEvents)")    }

 B、協議

1、聲明一個protocol，裡面有三個可選實現的方法，並把自身當做參數帶出去

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

 2、聲明一個delegate屬性，同樣是弱指標引用

    weak var delegate:MyViewButtonDelegate!

 3、同樣在touch事件中實現

    extension MyViewButton{    //調用協議方法時判斷一下delegate和協議方法是否存在    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中實現即可

    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!)        //設定button的代理        self.myButton!.delegate = self}extension ViewController{    //實現代理方法    func didTouchMyButton(button: MyViewButton) {        print("delegate--VC點擊了button")    }    func didTouchUpInsideButton(button: MyViewButton) {        print("delegate--TouchUpInside")    }        func didTouchUpOutsideButton(button: MyViewButton) {        print("delegate--TouchUpOutside")    }    }

 C、閉包(block)

1、首先在自訂view裡實現，相當於typedef一個block類型

typealias MyBlock = (button:MyViewButton)->Void

 2、聲明三個block屬性，並且聲明三個給block賦值方法

    var TouchBlockHandel:MyBlock?    var TouchUpInsideBlockHandel:MyBlock?    var TouchUpOutsideBlockHandel:MyBlock?    //也可以不寫方法直接屬性賦值    func setMyTouchBlock(block:MyBlock){        self.TouchBlockHandel = block    }    func setMyTouchUpInsideBlock(block:MyBlock){        self.TouchUpInsideBlockHandel = block    }    func setMyTouchUpOutsideBlock(block:MyBlock){        self.TouchUpOutsideBlockHandel = block    }

 3、在touch事件中實現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、同樣在VC中給三個block賦值即可

    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點擊了button")        })        self.myButton?.setMyTouchUpInsideBlock({ (button:MyViewButton) -> Void in            print("block--VCTouchUpInside")        })        self.myButton?.setMyTouchUpOutsideBlock({ (button:MyViewButton) -> Void in            print("block--VCTouchUpOutside")        })    }    }

 最後來看看三個方法寫在一起的列印結果。就添加了一個target監控TouchUpInside。總體來說和OC邏輯沒有任何變化，只是文法上有所不同，block還是好用

 好了，這樣就結束了，今天下雪了，大家注意保暖！

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

iOS_Swift初識之使用三種回調方式自訂Button