标签:xamarin xamarin-ios ios8 c
我正在尝试在UIViewController中使用UIAlertController显示消息.
使用VisualStudio 2015 CTP 5 …
来自的二手样品:
http://forums.xamarin.com/discussion/26404/uialertcontroller-question-for-ipad
http://www.hjerpbakk.com/blog/2014/11/23/from-uialertview-to-uialertcontroller-using-xamarin-and-async-await
https://gist.github.com/Sankra/622e5855f95189e13d77
根据以上示例,到目前为止,我有:
public partial class MyViewController : GenericViewController //inherits from UIViewController
{
.....
public async override void ViewDidLoad()
{
try
{
base.ViewDidLoad();
//other irrelevant code here
throw new Exception("Something went wrong");
}
catch (Exception ex)
{
int result = await AlertViewControllerHelper.ShowAlertDialogAsync(this, ex.StackTrace, true);
}
}
........
}
我的静态助手类:
public static class AlertViewControllerHelper
{
public static Task<int> ShowAlertDialogAsync(UIViewController parent, string stackTrace, bool debugMode = false)
{
var taskCompletionSource = new TaskCompletionSource<int>();
try
{
var alert = UIAlertController.Create("Error", stackTrace, UIAlertControllerStyle.ActionSheet);
if (alert.PopoverPresentationController != null)
{
alert.PopoverPresentationController.SourceView = parent.View;
alert.PopoverPresentationController.SourceRect = parent.View.Bounds;
}
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default,
a => taskCompletionSource.SetResult(0)));
if (debugMode)
{
alert.AddAction(UIAlertAction.Create("Info", UIAlertActionStyle.Default,
a => taskCompletionSource.SetResult(1)));
}
parent.PresentViewController(alert, true, null);
}
catch (Exception ex)
{
}
return taskCompletionSource.Task;
}
运行代码后,未显示我的错误对话框.
我已经使用UIAlertView完成了一个示例,但是到目前为止,UIAlertController还是没有运气(这是我的要求)
提前致谢…
解决方法:
找到解决方案:
1.传递ParentViewController而不是当前的视图控制器(this)
public partial class MyViewController : GenericViewController //inherits from UIViewController
{
.....
public async override void ViewDidLoad()
{
try
{
base.ViewDidLoad();
//other irrelevant code here
throw new Exception("Something went wrong");
}
catch (Exception ex)
{
int actionCode = await AlertViewControllerHelper.ShowAlertDialogAsync(ParentViewController, AlertViewControllerHelper.ERRORDESCRIPTION);
if (actionCode == AlertViewControllerHelper.INFOACTIONCODE)
{
await AlertViewControllerHelper.ShowAlertDialogAsync(ParentViewController, string.Format("{0} : {1}", ex.Message, ex.StackTrace), actionCode);
}
}
}
........
}
>然后,Helper方法将像这样实现:
public static Task<int> ShowAlertDialogAsync(UIViewController parent, string stackTrace, int actionCode = 0)
{
bool isDebug = false;
// #if DEBUG
isDebug = true;
//#endif
var taskCompletionSource = new TaskCompletionSource<int>();
var alert = UIAlertController.Create(ERROR, stackTrace, UIAlertControllerStyle.Alert);
if (alert.PopoverPresentationController != null)
{
alert.PopoverPresentationController.SourceView = parent.View;
alert.PopoverPresentationController.SourceRect = parent.View.Bounds;
}
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default,
a => taskCompletionSource.SetResult(0)));
if (isDebug && actionCode == OKACTIONCODE)
{
alert.AddAction(UIAlertAction.Create("Info", UIAlertActionStyle.Default,
a => taskCompletionSource.SetResult(1)));
}
parent.PresentViewController(alert, true, null);
return taskCompletionSource.Task;
}
标签:xamarin,xamarin-ios,ios8,c 来源: https://codeday.me/bug/20191120/2045863.html
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