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）
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
import UIKit
class ViewController: UIViewController ,UIActionSheetDelegate {
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(animated: Bool){
super.viewDidAppear(animated)
let alertController = UIAlertController(title: "系统提示",
message: "您确定要离开hangge.com吗？", preferredStyle: UIAlertControllerStyle.Alert)
let cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil)
let okAction = UIAlertAction(title: "好的", style: UIAlertActionStyle.Default,
handler: {
action in
print("点击了确定")
})
alertController.addAction(cancelAction)
alertController.addAction(okAction)
self.presentViewController(alertController, animated: true, completion: nil)
}
override func didReceiveMemoryWarning() {
super.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）
|
1
2
3
4
5
6
7
8
9
|
var alertController = UIAlertController(title: "保存或删除数据", message: "删除数据将不可恢复",
preferredStyle: UIAlertControllerStyle.ActionSheet)
var cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil)
var deleteAction = UIAlertAction(title: "删除", style: UIAlertActionStyle.Destructive, handler: nil)
var archiveAction = UIAlertAction(title: "保存", style: UIAlertActionStyle.Default, handler: nil)
alertController.addAction(cancelAction)alertController.addAction(deleteAction)alertController.addAction(archiveAction)self.presentViewController(alertController, animated: true, completion: nil)
|
3，按钮使用“告警”样式（文字颜色变红，用来来警示用户）
|
1
|
var okAction = UIAlertAction(title: "好的", style: UIAlertActionStyle.Destructive, handler: nil)
|
4，添加任意数量文本输入框（比如可以用来实现个登陆框）
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
import UIKit
class ViewController: UIViewController ,UIActionSheetDelegate {
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(animated: Bool){
super.viewDidAppear(animated)
let alertController = UIAlertController(title: "系统登录",
message: "请输入用户名和密码", preferredStyle: UIAlertControllerStyle.Alert)
alertController.addTextFieldWithConfigurationHandler {
(textField: UITextField!) -> Void in
textField.placeholder = "用户名"
}
alertController.addTextFieldWithConfigurationHandler {
(textField: UITextField!) -> Void in
textField.placeholder = "密码"
textField.secureTextEntry = true
}
let cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil)
let okAction = UIAlertAction(title: "好的", style: UIAlertActionStyle.Default,
handler: {
action in
let login = alertController.textFields!.first! as UITextField
let password = alertController.textFields!.last! as UITextField
print("用户名：\(login.text) 密码：\(password.text)")
})
alertController.addAction(cancelAction)
alertController.addAction(okAction)
self.presentViewController(alertController, animated: true, completion: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
} |
5，使用代码移除提示框
|
1
|
self.presentedViewController?.dismissViewControllerAnimated(false, completion: nil)
|