自iOS8起,苹果就建议告警框使用UIAlertController来代替UIAlertView和UIActionSheel。下面总结了一些常见的用法(本文代码都已更新至Swift3)
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)
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)
5,使用代码移除提示框
6,提示框弹出后,过段时间自动移除
下面样例弹出一个不带按钮的消息提示框,过个两秒钟提示框自动消失。
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 {
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: .alert)
let cancelAction
= UIAlertAction(title: "取消",
style: .cancel, handler: nil)
let okAction
= UIAlertAction(title: "好的",
style: .default,
handler: {
action in
print("点击了确定")
})
alertController.addAction(cancelAction)
alertController.addAction(okAction)
self.present(alertController,
animated: true,
completion: nil)
}
override func didReceiveMemoryWarning()
{
super.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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let alertController
= UIAlertController(title: "保存或删除数据",
message: "删除数据将不可恢复",
preferredStyle:
.actionSheet)
let cancelAction
= UIAlertAction(title: "取消",
style: .cancel, handler: nil)
let deleteAction
= UIAlertAction(title: "删除",
style: .destructive, handler: nil)
let archiveAction
= UIAlertAction(title: "保存",
style: .default,
handler: nil)
alertController.addAction(cancelAction)
alertController.addAction(deleteAction)
alertController.addAction(archiveAction)
self.present(alertController,
animated: true,
completion: nil)
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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)
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let okAction
= UIAlertAction(title: "好的",
style: .destructive, handler: nil)
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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
class ViewController: UIViewController {
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: .alert)
alertController.addTextField
{
(textField: UITextField!)
-> Void in
textField.placeholder
= "用户名"
}
alertController.addTextField
{
(textField: UITextField!)
-> Void in
textField.placeholder
= "密码"
textField.isSecureTextEntry
= true
}
let cancelAction
= UIAlertAction(title: "取消",
style: .cancel, handler: nil)
let okAction
= UIAlertAction(title: "好的",
style: .default,
handler: {
action in
//也可以用下标的形式获取textField
let login = alertController.textFields![0]
let login
= alertController.textFields!.first!
let password
= alertController.textFields!.last!
print("用户名:\(login.text)
密码:\(password.text)")
})
alertController.addAction(cancelAction)
alertController.addAction(okAction)
self.present(alertController,
animated: true,
completion: nil)
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
}
}
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5,使用代码移除提示框
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self.presentedViewController?.dismiss(animated: false,
completion: nil)
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6,提示框弹出后,过段时间自动移除
下面样例弹出一个不带按钮的消息提示框,过个两秒钟提示框自动消失。
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let alertController
= UIAlertController(title: "保存成功!",
message: nil,
preferredStyle: .alert)
//显示提示框
self.present(alertController,
animated: true,
completion: nil)
//两秒钟后自动消失
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now()
+ 2) {
self.presentedViewController?.dismiss(animated: false,
completion: nil)
}
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原文出自:www.hangge.com 转载请保留原文链接:http://www.hangge.com/blog/cache/detail_651.html