swift

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