iOS_Swift初識之使用三種回調方式自定義Button

 

最近在學習Swift ,發現青玉伏案大神早期用OC寫的一篇博客--IOS開發之自定義Button(集成三種回調模式)  很適合用來熟悉Swift的回調方式，因而我就用Swift翻版了一下，具體實現原理就很少說了，主要貼上Swift的代碼給你們看看。因爲剛開始瞭解Swift，有使用不恰當的地方請輕拍。。。。

 

上代碼：

一、新建一個xib，拖一個UIView到界面上，綁定上自定義的UIView類，拖一個UILabel到view上，寫上Button僞裝是個UIButton；並將label拖到代碼當中

二、我這裏回調三種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、設置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同樣要用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事件的代理裏面實現Target方法、並把label的顏色改改，這樣纔像button，我把代理方法寫在了extension延展裏面，由於我見蘋果都這樣

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類型和觸摸點移出狀況相匹配時執行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，選擇不一樣的點擊類型便可監控不一樣的點擊事件啦

    class ViewController: UIViewController , MyViewButtonDelegate {
    
    var myButton:MyViewButton?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        //從xib中加載咱們自定義的view，個人xib叫作「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 實現點擊方法便可

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

 B、協議

一、聲明一個protocol，裏面有三個可選實現的方法，並把自身當作參數帶出去

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

 二、聲明一個delegate屬性，一樣是弱指針引用

    weak var delegate:MyViewButtonDelegate!

 三、一樣在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)
            }
        }
    }
}

 四、在VC中實現便可

    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!)
        //設置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)

一、首先在自定義view裏實現，至關於typedef一個block類型

typealias MyBlock = (button:MyViewButton)->Void

 二、聲明三個block屬性，而且聲明三個給block賦值方法

    var TouchBlockHandel:MyBlock?
    var TouchUpInsideBlockHandel:MyBlock?
    var TouchUpOutsideBlockHandel:MyBlock?
    //也能夠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
    }

 三、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)
        }
}

 四、一樣在VC中給三個block賦值便可

    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塊兒的打印結果。就添加了一個target監控TouchUpInside。整體來講和OC邏輯沒有任何變化，只是語法上有所不一樣，block仍是好用

 好了，這樣就結束了，今天下雪了，你們注意保暖！