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"
message:
"您确定要离开hangge.com吗？"
UIAlertControllerStyle
.
Alert
)
cancelAction =
UIAlertAction
"取消"
UIAlertActionStyle
Cancel
nil
)
okAction =
"好的"
Default
handler: {
action
in
print
(
"点击了确定"
)
})
alertController.addAction(cancelAction)
alertController.addAction(okAction)
self
.presentViewController(alertController,animated:
true
)
}
didReceiveMemoryWarning() {
.didReceiveMemoryWarning()
}
}
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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"
"删除数据将不可恢复"
preferredStyle:
UIAlertControllerStyle
ActionSheet
)
cancelAction =
UIAlertAction
)
deleteAction =
"删除"
UIAlertActionStyle
Destructive
)
archiveAction =
"保存"
)
alertController.addAction(cancelAction)
alertController.addAction(deleteAction)
alertController.addAction(archiveAction)
)
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3，按钮使用“告警”样式（文字颜色变红，用来来警示用户）
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
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 =
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()
}
}
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5，使用代码移除提示框
.presentedViewController?.dismissViewControllerAnimated(
false
)
