Swift - 告警提示框UIAlertController的用法

自iOS8起，苹果就建议告警框使用UIAlertController来代替UIAlertView。下面总结了一些常见的用法：

1，简单的应用（同时按钮响应Handler使用闭包函数）

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import UIKit class ViewController : UIViewController , UIActionSheetDelegate { override func viewDidLoad() { super .viewDidLoad() } viewDidAppear(animated: Bool ){ .viewDidAppear(animated) let alertController = UIAlertController (title: "系统提示" ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas, message: "您确定要离开hangge.com吗？" ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,preferredStyle: UIAlertControllerStyle . Alert ) cancelAction = UIAlertAction "取消" ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,style: UIAlertActionStyle Cancel ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,handler: nil ) okAction = "好的" Default ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas, handler: { action in print ( "点击了确定" ) }) alertController.addAction(cancelAction) alertController.addAction(okAction) self .presentViewController(alertController,animated: true ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,completion: ) } didReceiveMemoryWarning() { .didReceiveMemoryWarning() // dispose of any resources that can be recreated. } }

2，除了弹出，还可以使用从底部向上滑出的样式
（注意：如果上拉菜单中有“取消”按钮的话，那么它永远都会出现在菜单的底部，不管添加的次序是如何）

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var alertController = UIAlertController "保存或删除数据" ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,message: "删除数据将不可恢复" ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas, preferredStyle: UIAlertControllerStyle ActionSheet ) cancelAction = UIAlertAction ) deleteAction = "删除" ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,style: UIAlertActionStyle Destructive ) archiveAction = "保存" ) alertController.addAction(cancelAction) alertController.addAction(deleteAction) alertController.addAction(archiveAction) )

3，按钮使用“告警”样式（文字颜色变红，用来来警示用户）

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4，添加任意数量文本输入框（比如可以用来实现个登陆框）

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import UIKit ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:0px 1em!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; min-height:auto!important; background:none rgb(249, UIActionSheetDelegate viewDidAppear(animated: Bool "系统登录" "请输入用户名和密码" ) alertController.addTextFieldWithConfigurationHandler { (textField: UITextField !) -> Void in textField.placeholder = "用户名" } alertController.addTextFieldWithConfigurationHandler { in "密码" textField.secureTextEntry = true } ) okAction = ottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.5em!important; margin:0px!important; overflow:visible!important; padding:1px 0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas, handler: { in login = alertController.textFields!.first! as UITextField password = alertController.textFields!.last! as UITextField "用户名：\(login.text) 密码：\(password.text)" ) }) alertController.addAction(cancelAction) alertController.addAction(okAction) ) } didReceiveMemoryWarning() { .didReceiveMemoryWarning() } }

5，使用代码移除提示框

.presentedViewController?.dismissViewControllerAnimated(false)