swift2.0 protocol 实战自定义UIAlertView

官网文档 protocol
该协议可以通过一个类，结构或枚举定义这些需要的方法

首先我们创建一个UIView 来实现AlertView 的载体
命名为 SwiftCustomAlertView.swift

首先我们假设AlertView 有两个按钮，确定和取消
我们要实现这两个按钮的协议来通知控制器我们点击了哪个按钮。如下

下面就具体如何实现AlertView 界面写得都非常简单一看就明白，我就不具体说明了，具体思路掌握了，就可以任意自定义控件了

@objc protocol SwiftCustomAlertViewDelegate : NSObjectProtocol{

    optional func  selectOkButtonalertView()

    optional func  selecttCancelButtonAlertView()

}

optional 操作符来指定协议可以不实现
继承 NSObjectProtocol 可以用来后面调用respondsToSelector 方法检测是否实现了该delegate
如果需要传值可以在方法里添class

SwiftCustomAlertView: UIView {

  private let defaultWidth = 280.0 //默认Alert宽度 private let defaultHeight = 146.0 //默认Alert高度 private let defaultCornerRadius = 5.0 //默认Alert 圆角度数 private var viewY:Double! private var viewWidth: Double! private var viewHeight: Double! private var cancelButtonTitle: String? private var oKButtonTitle: String? private var cancelButton: UIButton? private var oKButton: UIButton? private var title: String? private var message: String? private var titleLabel: UILabel! private var messageLabel: UILabel! var cornerRadius: Double! weak var delegate: SwiftCustomAlertViewDelegate? // delegate //初始化 init(title: String?,message: String?,delegate: SwiftCustomAlertViewDelegate?) { super.init(frame: CGRect(x: 0,y: 0,width: defaultWidth,height: defaultHeight)) setup(title,message: message,delegate: delegate) } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } //设置相关数据 private func setup(title: String?,delegate: SwiftCustomAlertViewDelegate?) { self.title = title self.message = message self.delegate = delegate self.setUpDefaultValue() self.setUpElements() } //默认参数 private func setUpDefaultValue() { clipsToBounds = true cancelButtonTitle = "取消" oKButtonTitle = "确定" viewWidth = defaultWidth viewHeight = defaultHeight cornerRadius = defaultCornerRadius layer.cornerRadius = CGFloat(cornerRadius) self.backgroundColor = UIColor.redColor() } //设置相关ui private func setUpElements() { titleLabel = UILabel(frame: CGRectZero) messageLabel = UILabel(frame: CGRectZero) if title != nil { titleLabel.text = title titleLabel.numberOfLines = 0 titleLabel.lineBreakMode = NSLineBreakMode.ByWordWrapping titleLabel.textColor = UIColor.blackColor() titleLabel.font = UIFont.boldSystemFontOfSize(17) titleLabel.textAlignment = NSTextAlignment.Center titleLabel.backgroundColor = UIColor.clearColor() addSubview(titleLabel) } if message != nil { messageLabel.text = message messageLabel.numberOfLines = 0 messageLabel.lineBreakMode = NSLineBreakMode.ByWordWrapping messageLabel.textColor = UIColor.blackColor() messageLabel.font = UIFont.systemFontOfSize(13) messageLabel.textAlignment = NSTextAlignment.Center messageLabel.backgroundColor = UIColor.clearColor() addSubview(messageLabel) } if let cancelTitle = cancelButtonTitle { cancelButton = UIButton(type: UIButtonType.Custom) cancelButton!.setTitle(cancelTitle,forState: UIControlState.Normal) cancelButton!.backgroundColor = UIColor.blueColor() cancelButton!.setTitleColor(UIColor.blackColor(),forState: UIControlState.Normal) cancelButton!.titleLabel?.font = UIFont.boldSystemFontOfSize(17) cancelButton?.tag = 9 addSubview(cancelButton!) } if let okTitle = oKButtonTitle { oKButton = UIButton(type: UIButtonType.Custom) oKButton!.setTitle(okTitle,forState: UIControlState.Normal) oKButton!.backgroundColor = UIColor.yellowColor() oKButton!.setTitleColor(UIColor.blackColor(),forState: UIControlState.Normal) oKButton!.titleLabel?.font = UIFont.boldSystemFontOfSize(17) oKButton?.tag = 10 addSubview(oKButton!) } } private func layoutFrameshowing() { cancelButton!.addTarget(self,action: Selector("cancelButtonClicked:"),forControlEvents: UIControlEvents.TouchUpInside) cancelButton!.frame = CGRect(x: viewWidth/2,y: viewHeight-40,width: viewWidth/2,height: 40) oKButton!.addTarget(self,action: Selector("okButtonClicked:"),forControlEvents: UIControlEvents.TouchUpInside) oKButton!.frame = CGRect(x:0,height: 40) if title != nil { titleLabel.frame = CGRect(x: 10,y: 5,width: viewWidth - 20,height: 20) } if message != nil { messageLabel.frame = CGRect(x: 10,height: 0) labelHeightToFit(messageLabel) } if message != nil { messageLabel.center = CGPoint(x: viewWidth/2,y: 5 + Double(titleLabel.frame.size.height) + 20 + Double(messageLabel.frame.size.height)/2) } } private func labelHeightToFit(label: UILabel) { let maxWidth = label.frame.size.width - 20 let maxHeight : CGFloat = 500 let rect = label.attributedText?.boundingRectWithSize(CGSizeMake(maxWidth,maxHeight),options: .UsesLineFragmentOrigin,context: nil) var frame = label.frame frame.size.height = rect!.size.height label.frame = frame } func cancelButtonClicked(button: UIButton) { UIView.animateWithDuration(0.5,animations: { () -> Void @H_687_301@in self.center = CGPoint(x: -self.viewWidth,y:self.viewY + self.viewHeight/2) }) { (Bool) -> Void @H_687_301@in self.removeFromSuperview() } if delegate?.respondsToSelector(Selector("selecttCancelButtonAlertView")) == true { print("cancelDelegate") delegate?.selecttCancelButtonAlertView!() } } func okButtonClicked(button: UIButton) { UIView.animateWithDuration(0.5,animations: { () -> Void @H_687_301@in self.center = CGPoint(x:Double(UIScreen .mainScreen().bounds.size.width)+self.viewWidth,y:self.viewY + self.viewHeight/2) }) { (Bool) -> Void @H_687_301@in self.removeFromSuperview() } if delegate?.respondsToSelector(Selector("selectOkButtonalertView")) == true { delegate?.selectOkButtonalertView!() } } func show() { if let window: UIWindow = UIApplication.sharedApplication().keyWindow { show(window) } } func show(view: UIView) { layoutFrameshowing() self.viewY = (Double(view.frame.size.height) - viewHeight)/2 self.frame = CGRect(x: (Double(view.frame.size.width) - viewWidth)/2,y: viewY,width: viewWidth,height: viewHeight) view.addSubview(self) view.bringSubviewToFront(self) self.alpha = 0.3 UIView.animateWithDuration(0.2,delay: 0.0,options: .CurveEaSEOut,animations: { self.alpha = 1; self.transform = CGAffineTransformMakeScale(0.8,0.8) },completion: { finished @H_687_301@in UIView.animateWithDuration(0.2,animations: {() -> Void @H_687_301@in self.transform = CGAffineTransformMakeScale(1.2,1.2) }) { (Bool) -> Void @H_687_301@in UIView.animateWithDuration(0.1,animations: { () -> Void @H_687_301@in self.transform = CGAffineTransformMakeScale(1,1) }) } }) } }

在调用的地方

@H_687_301@let alertView = SwiftCustomAlertView(title:"swift",message:"custom swift alert",@H_687_301@delegate: self)
      alertView .show();

和实现delegate方法

func selectOkButtonalertView() { }

  func selecttCancelButtonAlertView() { }

原文链接：https://www.f2er.com/swift/325741.html

swift2.0 protocol 实战自定义UIAlertView

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