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/** UIAlertController UIAlertController.presentAlertController(vc: self,title: "警告",sureStr: "确定",cancelStr: "取消",thirdStr: "fafda") //通过block回调来执行相应的动作 LYBAlertControllerExtention.infoMarqueeClickBlock={ (index)in print("\(index)") return } */import UIKitclass LYBAlertControllerExtention: UIAlertController {    //定义一个闭包,有参数没返回值  static  var  infoMarqueeClickBlock:(Int)->()={ (Int)in return }    }extension UIAlertController{     class  func presentAlertController(vc:UIViewController, title:String,sureStr:String,cancelStr:String,thirdStr:String){        let alertControl=UIAlertController.init(title: title, message: "", preferredStyle: UIAlertController.Style.alert)        let sure=UIAlertAction.init(title: sureStr, style: UIAlertAction.Style.default) { (ac) in            //确认操作            print("确定")            LYBAlertControllerExtention.infoMarqueeClickBlock(0)        }         alertControl.addAction(sure)              if thirdStr != ""{        let third=UIAlertAction.init(title: thirdStr, style: UIAlertAction.Style.default) { (ac) in            //取消操作---注意所有按钮中只能有一个UIAlertActionStyle.cancel类型的按钮            print("第三个")              LYBAlertControllerExtention.infoMarqueeClickBlock(1)        }        alertControl.addAction(third)        }        let cancel=UIAlertAction.init(title: cancelStr, style: UIAlertAction.Style.cancel) { (ac) in            //取消操作---注意所有按钮中只能有一个UIAlertActionStyle.cancel类型的按钮            print("取消")              LYBAlertControllerExtention.infoMarqueeClickBlock(2)        }                alertControl.addAction(cancel)                vc.present(alertControl, animated: true) {        }    }    }

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