MonoTouch中的Messagebox.Show和DialogResult等效项
MonoTouch中的Messagebox.Show和DialogResult等效项
提问于 2011-01-06 16:31:01
我有一个来自UIAlertView的带有两个按钮的Yes/No对话框。我想在我的方法中实现类似如下的逻辑：
if(messagebox.Show() == DialogResult.OK)问题是，如果我调用UIAlertView.Show()，这个过程就会继续。但我需要等待用户交互的结果，并根据单击第二个按钮返回true或false。这在MonoTouch中是可能的吗？
回答 6
Stack Overflow用户
回答已采纳
发布于 2011-01-27 01:21:30
为此，您可以手动运行主循环。我没有设法直接停止主循环，所以我改为运行主循环0.5秒，并等待用户响应。
下面的函数展示了如何使用上面的方法实现模态查询：
int WaitForClick ()
{
int clicked = -1;
var x = new UIAlertView ("Title", "Message", null, "Cancel", "OK", "Perhaps");
x.Show ();
bool done = false;
x.Clicked += (sender, buttonArgs) => {
Console.WriteLine ("User clicked on {0}", buttonArgs.ButtonIndex);
clicked = buttonArgs.ButtonIndex;
};
while (clicked == -1){
NSRunLoop.Current.RunUntil (NSDate.FromTimeIntervalSinceNow (0.5));
Console.WriteLine ("Waiting for another 0.5 seconds");
}
Console.WriteLine ("The user clicked {0}", clicked);
return clicked;
}Stack Overflow用户
发布于 2012-03-27 12:58:59
基于米格尔的编码，这里是标准MessageBox的一个方便的替代品：
using System;
using System.Drawing;
using MonoTouch.UIKit;
using MonoTouch.Foundation;
using System.Collections.Generic;
namespace YourNameSpace
{
public enum MessageBoxResult
{
None = 0,
OK,
Cancel,
Yes,
No
}
public enum MessageBoxButton
{
OK = 0,
OKCancel,
YesNo,
YesNoCancel
}
public static class MessageBox
{
public static MessageBoxResult Show(string messageBoxText, string caption, MessageBoxButton buttonType)
{
MessageBoxResult res = MessageBoxResult.Cancel;
bool IsDisplayed = false;
int buttonClicked = -1;
MessageBoxButton button = buttonType;
UIAlertView alert = null;
string cancelButton = "Cancel";
string[] otherButtons = null;
switch (button)
{
case MessageBoxButton.OK:
cancelButton = "";
otherButtons = new string[1];
otherButtons[0] = "OK";
break;
case MessageBoxButton.OKCancel:
otherButtons = new string[1];
otherButtons[0] = "OK";
break;
case MessageBoxButton.YesNo:
cancelButton = "";
otherButtons = new string[2];
otherButtons[0] = "Yes";
otherButtons[1] = "No";
break;
case MessageBoxButton.YesNoCancel:
otherButtons = new string[2];
otherButtons[0] = "Yes";
otherButtons[1] = "No";
break;
}
if (cancelButton.Length > 0)
alert = new UIAlertView(caption, messageBoxText, null, cancelButton, otherButtons);
else
alert = new UIAlertView(caption, messageBoxText, null, null, otherButtons);
alert.BackgroundColor = UIColor.FromWhiteAlpha(0f, 0.8f);
alert.Canceled += (sender, e) => {
buttonClicked = 0;
IsDisplayed = false;
};
alert.Clicked += (sender, e) => {
buttonClicked = e.ButtonIndex;
IsDisplayed = false;
};
alert.Dismissed += (sender, e) => {
if (IsDisplayed)
{
buttonClicked = e.ButtonIndex;
IsDisplayed = false;
}
};
alert.Show();
IsDisplayed = true;
while (IsDisplayed)
{
NSRunLoop.Current.RunUntil (NSDate.FromTimeIntervalSinceNow (0.2));
}
switch (button)
{
case MessageBoxButton.OK:
res = MessageBoxResult.OK;
break;
case MessageBoxButton.OKCancel:
if (buttonClicked == 1)
res = MessageBoxResult.OK;
break;
case MessageBoxButton.YesNo:
if (buttonClicked == 0)
res = MessageBoxResult.Yes;
else
res = MessageBoxResult.No;
break;
case MessageBoxButton.YesNoCancel:
if (buttonClicked == 1)
res = MessageBoxResult.Yes;
else if (buttonClicked == 2)
res = MessageBoxResult.No;
break;
}
return res;
}
public static MessageBoxResult Show(string messageBoxText)
{
return Show(messageBoxText, "", MessageBoxButton.OK);
}
public static MessageBoxResult Show(string messageBoxText, string caption)
{
return Show(messageBoxText, caption, MessageBoxButton.OK);
}
}
}Stack Overflow用户
发布于 2014-03-01 04:58:47
我认为使用async/await的方法要好得多，而且不会在旋转设备时冻结应用程序，或者当自动滚动干扰并让你永远困在RunUntil循环中而无法点击按钮时(至少这些问题很容易在iOS7上重现)。
Task<int> ShowModalAletViewAsync (string title, string message, params string[] buttons)
{
var alertView = new UIAlertView (title, message, null, null, buttons);
alertView.Show ();
var tsc = new TaskCompletionSource<int> ();
alertView.Clicked += (sender, buttonArgs) => {
Console.WriteLine ("User clicked on {0}", buttonArgs.ButtonIndex);
tsc.TrySetResult(buttonArgs.ButtonIndex);
};
return tsc.Task;
} 页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/4613071
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