在一个主题上搜索一段时间后,我没有找到清楚和翔实的解释。 t 找到一个明确的解释,即使在它的类参考 UIAlertController参考
没关系,但对我来说不够清楚。
所以在收集一些peaces之后,我决定做出自己的解释(希望它有帮助)
所以这里:
2.1标题:字符串 - >显示在警报对话框顶部的大胆文本
2.2消息:字符串 - >较小的文本(几乎解释为自己)
2.3 prefferedStyle:UIAlertControllerStyle - >定义对话框样式,在大多数情况下: UIAlertControllerStyle.Alert
向用户显示,我们可以使用 showViewController 或 presentViewController 并将我们的警报作为参数
传递给我们可以使用的用户的一些交互:
4.1 UIAlertController.addAction 创建按钮
4.2 UIAlertController.addTextField to cre at文本字段
编辑备注:下面的代码示例,更新为swift 3语法
示例1 :简单对话框
@IBAction func alert1(发件人:UIButton){ //简单警报对话框 let alert = UIAlertController(标题:Alert 1,消息:One was won,preferredStyle:UIAlertControllerStyle.alert); //显示 show(alert,sender:self); }示例2 :具有一个输入textField和amp ;两个按钮
@IBAction func alert2(发件人:UIButton){ //与一个输入textField&两个按钮 let alert = UIAlertController(title:Alert 2,message:Two will win too,preferredStyle:UIAlertControllerStyle.alert); //默认输入textField(无配置...) alert.addTextField(configurationHandler:nil); //没有事件处理程序(只是关闭对话框) alert.addAction(UIAlertAction(title:No,style:UIAlertActionStyle.cancel,handler:nil)); //关闭事件处理函数 alert.addAction(UIAlertAction(title:Yes),style:UIAlertActionStyle.default,handler:{(action:UIAlertAction)in let fields = alert。 textFields !; print(是的,我们可以:+ fields [0] .text!); })); present(alert,animated:true,completion:nil); }示例3 :一个自定义输入textField&一个按钮
@IBAction func alert3(发件人:UIButton){ //一个输入&一个按钮 let alert = UIAlertController(标题:Alert 3,消息:Three will set me free,preferredStyle:UIAlertControllerStyle.alert); //配置输入textField var field:UITextField?; //运算符?因为它已被稍后初始化 alert.addTextField(configurationHandler:{(input:UITextField)in input.placeholder =我没有显示时,没有值;-); input.clearButtonMode = UITextFieldViewMode.whileEditing; field = input; //赋值给外部变量(以供参考)}); // alert3 yesHandler - >在同一范围内与alert进行定义,然后作为事件处理程序传递 func yesHandler(actionTarget:UIAlertAction){ print(YES - > !!); //打印来自'field'的文本,现在引用相关的输入 print(field!.text!); // operator!因为它是可选这里} //具有预定义函数的事件处理程序 alert.addAction(UIAlertAction(title:Yes,style:UIAlertActionStyle.default,handler:yesHandler)); present(alert,animated:true,completion:nil); }希望有帮助,祝你好运; - )
Couldn't find a clear and informative explanation for this.
解决方案After searching a while on a subject I didn't find a clear explanation , even in it's class reference UIAlertController Reference
It is ok, but not clear enough for me.
So after collecting some peaces I decided to make my own explanation (Hope it helps)
So here it goes:
2.1 title:String -> big-bold text to display on the top of alert's dialog box
2.2 message:String -> smaller text (pretty much explains it's self)
2.3 prefferedStyle:UIAlertControllerStyle -> define the dialog box style, in most cases: UIAlertControllerStyle.Alert
Now to actually show it to the user, we can use showViewController or presentViewController and pass our alert as parameter
To add some interaction with a user we can use:
4.1 UIAlertController.addAction to create buttons
4.2 UIAlertController.addTextField to create text fields
Edit note: code examples below, updated for swift 3 syntax
Example 1: Simple Dialog
@IBAction func alert1(sender: UIButton) { //simple alert dialog let alert=UIAlertController(title: "Alert 1", message: "One has won", preferredStyle: UIAlertControllerStyle.alert); //show it show(alert, sender: self); }Example 2: Dialog with one input textField & two buttons
@IBAction func alert2(sender: UIButton) { //Dialog with one input textField & two buttons let alert=UIAlertController(title: "Alert 2", message: "Two will win too", preferredStyle: UIAlertControllerStyle.alert); //default input textField (no configuration...) alert.addTextField(configurationHandler: nil); //no event handler (just close dialog box) alert.addAction(UIAlertAction(title: "No", style: UIAlertActionStyle.cancel, handler: nil)); //event handler with closure alert.addAction(UIAlertAction(title: "Yes", style: UIAlertActionStyle.default, handler: {(action:UIAlertAction) in let fields = alert.textFields!; print("Yes we can: "+fields[0].text!); })); present(alert, animated: true, completion: nil); }Example 3: One customized input textField & one button
@IBAction func alert3(sender: UIButton) { // one input & one button let alert=UIAlertController(title: "Alert 3", message: "Three will set me free", preferredStyle: UIAlertControllerStyle.alert); //configured input textField var field:UITextField?;// operator ? because it's been initialized later alert.addTextField(configurationHandler:{(input:UITextField)in input.placeholder="I am displayed, when there is no value ;-)"; input.clearButtonMode=UITextFieldViewMode.whileEditing; field=input;//assign to outside variable(for later reference) }); //alert3 yesHandler -> defined in the same scope with alert, and passed as event handler later func yesHandler(actionTarget: UIAlertAction){ print("YES -> !!"); //print text from 'field' which refer to relevant input now print(field!.text!);//operator ! because it's Optional here } //event handler with predefined function alert.addAction(UIAlertAction(title: "Yes", style: UIAlertActionStyle.default, handler: yesHandler)); present(alert, animated: true, completion: nil); }Hope It helps, and good luck ;-)
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在哪里可以找到关于快速警报(UIAlertController)的清晰解释?
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