绑定到Text属性IOS-统一不工作 [英] Binding to Text property ios-unified not working

问题描述

我更新了我的xamarin IOS-项目，以统一的API（支持64位）。一切都如预期。该项目构建和运作。

不过，我发现一个问题。结合到UILabel.Text属性将不再工作。所有其他绑定仍在工作（对UIButton.Hidden属性例如）。这里是我的code：

  //创建绑定
VAR套= this.CreateBindingSet＆LT; MyView的，MyViewModel＆GT;（）;
set.Bind（labelitem）//不工作
    。对于（T =＆GT; t.Text）
    。要（V =＆GT; v.MyStringValue）;
set.Bind（buttonitem）//工作
    。对于（B = GT; b.Hidden）
    。要（V =＆GT; v.MyboolValue）
    .WithConversion（新InverseBoolValueConverter（））;
set.Apply（）;
 

我使用MvvmCross的绑定。 Bevore统一更新一切正常。

首先，我试图改变的链接器选项为不链接。同样的问题。

谁能解释一下我，什么的发生？谢谢

修改

我发现在输出信息在调试时我的项目：

  

弱目标为空在MvxUILabelTextTargetBinding - 跳过集

解决方案

有一些，有些人看到的问题，其他人都没有，在最新的Xamarin稳定版本（VS和XS之间也许不同的新的GC - 目前还不清楚......）。您可以在 https://github.com/MvvmCross/MvvmCross/issues/902（上<一一些背景href=\"http://stackoverflow.com/questions/28263138/migrating-to-unified-api-and-new-reference-counting\">Migrating以统一的API和新的引用计数）

有在 HTTP来解决这些尝试：// slodge .blogspot.co.uk / 2015/02/351-α-release.html - 请不要尝试阿尔法的包，看他们是否帮助

。

如果不是，那么唯一的解决办法接受，现在是促进你的的UILabel 在您查看私有变量。

I updated my xamarin ios-project to the unified API (64 Bit support). Everything worked as expected. The project builds and works.

But I detected one problem. The binding to UILabel.Text properties won't work anymore. All other bindings are still working (to a UIButton.Hidden property for example). Here is my code:

// Create bindings
var set = this.CreateBindingSet<MyView, MyViewModel>();
set.Bind(labelitem)      // not working
    .For(t => t.Text)
    .To(v => v.MyStringValue);
set.Bind(buttonitem)     // working
    .For(b => b.Hidden)
    .To(v => v.MyboolValue)
    .WithConversion(new InverseBoolValueConverter());
set.Apply();

I'm using MvvmCross for the bindings. Bevore the unified-update everything worked fine.

First I tried to change the Linker-Option to "don't link". Same problem.

Can anyone explain me, what's happen? Thanks

Edit

I found a info in the output while debugging my project:

Weak Target is null in MvxUILabelTextTargetBinding - skipping set

解决方案

There are some issues that some people are seeing, others are not, with the new GC in the latest Xamarin "stable" releases (maybe differences between VS and XS - it's not clear...). You can read about these on https://github.com/MvvmCross/MvvmCross/issues/902 (with some background on Migrating to Unified API and new reference counting)

There's an attempt to address these in http://slodge.blogspot.co.uk/2015/02/351-alpha-release.html - please do try the alpha packages to see if they help.

If not, then the only accepted workaround right now is to promote your UILabel to a private variable in your View.

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