Swift的UIAlertController用法

//    定义button

let centerBtn = UIButton(frame:CGRectMake(view.frame.size.width/2-50,100,100,50))

centerBtn.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Normal)

centerBtn.setTitle("中部弹出框", forState: UIControlState.Normal)

centerBtn.backgroundColor = UIColor.orangeColor()

centerBtn.addTarget(self, action: #selector(ViewController.centerBtnClicked), forControlEvents: UIControlEvents.TouchUpInside)

self.view.addSubview(centerBtn)

//      定义button

let bottomBtn = UIButton(frame:CGRectMake(view.frame.size.width/2-50,200,100,50))

bottomBtn.backgroundColor = UIColor.brownColor()

bottomBtn.setTitle("底部弹出框", forState: UIControlState.Normal)

bottomBtn.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Normal)

bottomBtn.addTarget(self, action: #selector(ViewController.bottomBtnClicked), forControlEvents: UIControlEvents.TouchUpInside)

self.view.addSubview(bottomBtn)

}

//    底部弹出框

func bottomBtnClicked(){

let alertSheet = UIAlertController.init(title: "分享", message: nil,preferredStyle: .ActionSheet)

let alertSheetAction = UIAlertAction.init(title: "朋友圈分享",style: .Default,handler:  {(UIAlertAction) ->Void in

print("朋友圈分享")

})

let alertSheetDestructive = UIAlertAction.init(title: "QQ分享",style: .Default,handler: {(UIAlertAction) ->Void in

print("QQ分享")

})

let alertSheetCancel = UIAlertAction.init(title: "取消", style: .Cancel,handler: {(UIAlertAction) ->Void in

print("取消")

})

alertSheet.addAction(alertSheetAction)

alertSheet.addAction(alertSheetDestructive)

alertSheet.addAction(alertSheetCancel)

self.presentViewController(alertSheet, animated: true, completion: nil)

}

//中部弹出框

func centerBtnClicked(){

//    中间弹出效果

let alertView: UIAlertController = UIAlertController.init(title: "提示", message: "是否要更新", preferredStyle: UIAlertControllerStyle.Alert)

let alertViewDefaultAction: UIAlertAction = UIAlertAction.init(title: "确定", style: UIAlertActionStyle.Default, handler: { (UIAlertAction) -> Void in

print("正在更新")

})

let alertViewCanceltAction: UIAlertAction = UIAlertAction.init(title: "取消", style: UIAlertActionStyle.Cancel, handler: { (UIAlertAction) -> Void in

print("取消更新")

})

//        红色的字体

let alertViewDestructiveAction: UIAlertAction = UIAlertAction.init(title: "销毁",style: UIAlertActionStyle.Destructive, handler: {(UIAlertAction) -> Void in

print("已经销毁掉了")

} )

//        用户名

alertView.addTextFieldWithConfigurationHandler({(UITextField) -> Void in

UITextField.placeholder = "name"

UITextField.clearButtonMode = UITextFieldViewMode.WhileEditing

})

//        密码

alertView.addTextFieldWithConfigurationHandler({(UITextField) -> Void in

UITextField.placeholder = "password"

UITextField.clearButtonMode = UITextFieldViewMode.WhileEditing

})

alertView.addAction(alertViewDefaultAction)

alertView.addAction(alertViewCanceltAction)

alertView.addAction(alertViewDestructiveAction)

self.presentViewController(alertView, animated:true , completion: nil)

}