MvvmCross Xamarin IOS TextView Binding with Conversion 不再起作用

Question

我有一个Xamarin.IOS应用程序，并使用MvvmCross和ResxPlugin进行翻译。这在调试中没有问题。但是由于我从我猜 5.3.x 更新到 5.6.3，当我尝试执行以下行时，应用程序在发布模式下崩溃，链接器设置为"仅链接框架 SDK"：

bindingSet.Bind(textViewWelcomeMessage)
                      .For(txt => txt.Text)
                      .To(vm => vm.TextSource)
                      .WithConversion(new MvxLanguageConverter(), "WelcomeMessage");

这没有问题：

bindingSet.Bind(textFieldAgreementText)
                  .For(lbl => lbl.AttributedText)
                  .To(vm => vm.GeneralAgreementText)
                  .WithConversion("StringToHtml");

所以我假设问题出在 MvxLanguageConverter 与 textFields 的结合中。

在我的"LinkerPleaseInlude"文件中，我添加了以下内容：

    public void Include(UITextView textView)
    {
        textView.Text = textView.Text + "";
        textView.AttributedText = new NSAttributedString();
        textView.Changed += (sender, args) => { textView.Text = ""; };
    }

输出中的错误消息是：

2018-01-24 09:37:39.415 ConnectContacts.Ios[27680:1063685] System.ArgumentNullException: missing source event info in MvxWeakEventSubscription
Parameter name: sourceEventInfo
  at MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`2[TSource,TEventArgs]..ctor (UIKit.NSTextStorage source, System.Reflection.EventInfo sourceEventInfo, System.EventHandler`1[TEventArgs] targetEventHandler) [0x00017] in <6adc0d5857264558a9d45778a78ae02a>:0 
  at MvvmCross.Platform.WeakSubscription.MvxWeakEventSubscription`2[TSource,TEventArgs]..ctor (UIKit.NSTextStorage source, System.String sourceEventName, System.EventHandler`1[TEventArgs] targetEventHandler) [0x00012] in <6adc0d5857264558a9d45778a78ae02a>:0 
  at MvvmCross.Platform.WeakSubscription.MvxWeakSubscriptionExtensionMethods.WeakSubscribe[TSource,TEventArgs] (TSource source, System.String eventName, System.EventHandler`1[TEventArgs] eventHandler) [0x00000] in <6adc0d5857264558a9d45778a78ae02a>:0 
  at MvvmCross.Binding.iOS.Target.MvxUITextViewTextTargetBinding.SubscribeToEvents () [0x00053] in <614c9ef828c14ba687a40ec2656f480f>:0 
  at MvvmCross.Binding.Bindings.MvxFullBinding.CreateTargetBinding (System.Object target) [0x00057] in <866b1e46764b48aab0d408952a6f006f>:0 
  at MvvmCross.Binding.Bindings.MvxFullBinding..ctor (MvvmCross.Binding.MvxBindingRequest bindingRequest) [0x0002f] in <866b1e46764b48aab0d408952a6f006f>:0 
  at MvvmCross.Binding.Binders.MvxFromTextBinder.BindSingle (MvvmCross.Binding.MvxBindingRequest bindingRequest) [0x00000] in <866b1e46764b48aab0d408952a6f006f>:0 
  at MvvmCross.Binding.Binders.MvxFromTextBinder+<>c__DisplayClass2_0.<Bind>b__0 (MvvmCross.Binding.Bindings.MvxBindingDescription description) [0x00018] in <866b1e46764b48aab0d408952a6f006f>:0 
  at System.Linq.Enumerable+SelectArrayIterator`2[TSource,TResult].MoveNext () [0x0003a] in <8bc31b0df50a4d32b3f1d5af764165ad>:0 
  at MvvmCross.Binding.BindingContext.MvxBindingContextOwnerExtensions.AddBindings (MvvmCross.Binding.BindingContext.IMvxBindingContextOwner view, System.Object target, System.Collections.Generic.IEnumerable`1[T] bindings, System.Object clearKey) [0x0001d] in <866b1e46764b48aab0d408952a6f006f>:0 
  at MvvmCross.Binding.BindingContext.MvxBindingContextOwnerExtensions.AddBindings (MvvmCross.Binding.BindingContext.IMvxBindingContextOwner view, System.Object target, System.Collections.Generic.IEnumerable`1[T] bindingDescriptions, System.Object clearKey) [0x00018] in <866b1e46764b48aab0d408952a6f006f>:0 
  at MvvmCross.Binding.BindingContext.MvxBindingContextOwnerExtensions.AddBinding (MvvmCross.Binding.BindingContext.IMvxBindingContextOwner view, System.Object target, MvvmCross.Binding.Bindings.MvxBindingDescription bindingDescription, System.Object clearKey) [0x0000b] in <866b1e46764b48aab0d408952a6f006f>:0 
  at MvvmCross.Binding.BindingContext.MvxBaseFluentBindingDescription`1[TTarget].Apply () [0x0001f] in <866b1e46764b48aab0d408952a6f006f>:0 
  at MvvmCross.Binding.BindingContext.MvxFluentBindingDescriptionSet`2[TOwningTarget,TSource].Apply () [0x00016] in <866b1e46764b48aab0d408952a6f006f>:0 
  at ConnectContacts.Ios.Views.Wizard.WelcomeView.ViewDidLoad () [0x001ae] in <b2a318752d5d4fbeb6d32a83c8b6f752>:0 
--- End of stack trace from previous location where exception was thrown ---

我必须对新版本进行一些不同的事情吗？

Answer 1

您需要将

以下内容添加到LinkerPleaseInlude中才能UITextView

textView.TextStorage.DidProcessEditing += (sender, e) => textView.Text = "";

查看此 GitHub 问题