MvvmCross：iOS 设备上的绑定警告答案

【问题标题】：MvvmCross: Binding warning on iOS deviceMvvmCross：iOS 设备上的绑定警告
【发布时间】：2015-04-07 20:32:30
【问题描述】：

我已经像 Stuart 在这篇文章中所说的那样创建了我的绑定：MvvmCross - How to bind UIView.Layer.AnyProperty (Xamarin.iOS) to a property on a viewmodel?

这适用于模拟器，但不适用于 iOS 设备。我已经添加了 LinkerPleaseInclude.cs 但这并没有改变。

绑定到 BorderWidth 效果很好，绑定到 BorderColor 会显示警告。

LinkerPleaseInclude.cs：

public class LinkerPleaseInclude
{
    public void Include(UIButton uiButton)
    {
        uiButton.TouchUpInside += (s, e) =>
                                  uiButton.SetTitle(uiButton.Title(UIControlState.Normal), UIControlState.Normal);
    }

    public void Include(UIBarButtonItem barButton)
    {
        barButton.Clicked += (s, e) =>
                             barButton.Title = barButton.Title + "";
    }

    public void Include(UITextField textField)
    {
        textField.Text = textField.Text + "";
        textField.EditingChanged += (sender, args) => { textField.Text = ""; };
    }

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

    public void Include(UILabel label)
    {
        label.Text = label.Text + "";
    }

    public void Include(UIImageView imageView)
    {
        imageView.Image = new UIImage();
    }

    public void Include(UIDatePicker date)
    {
        date.Date = date.Date.AddSeconds(1);
        date.ValueChanged += (sender, args) => { date.Date = DateTime.MaxValue.ToNSDate(); };
    }

    public void Include(UISlider slider)
    {
        slider.Value = slider.Value + 1;
        slider.ValueChanged += (sender, args) => { slider.Value = 1; };
    }

    public void Include(UISwitch sw)
    {
        sw.On = !sw.On;
        sw.ValueChanged += (sender, args) => { sw.On = false; };
    }

    public void Include(INotifyCollectionChanged changed)
    {
        changed.CollectionChanged += (s,e) => { var test = string.Format("{0}{1}{2}{3}{4}", e.Action,e.NewItems, e.NewStartingIndex, e.OldItems, e.OldStartingIndex); } ;
    }
}

我的绑定代码：

bindingSet.Bind(this.MyUITextField.Layer)
              .For(x => x.BorderColor)
              .To(x => x.MyViewModelProperty.IsValid)
              .WithConversion("ValidationStyleBorderColor");
bindingSet.Bind(this.MyUITextField.Layer)
              .For(x => x.BorderWidth)
              .To(x => x.MyViewModelProperty.IsValid)
              .WithConversion("ValidationStyleBorderWidth");
bindingSet.Apply();

我的转换器：

public class ValidationStyleBorderColorValueConverter : MvxValueConverter<bool, CGColor>
{
    protected override CGColor Convert(bool value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return value == true ? Themes.Default.HighlightColor.CGColor : Themes.Default.ErrorColor.CGColor;
    }
}

还有警告：MvxBind: Warning: 22,91 Failed to create target binding for binding BorderColor for MyViewModelProperty.IsValid

我做错了什么？

【问题讨论】：

还有跟踪文本吗？例如在您发布警告之前？
不，仅此而已。 mvx：诊断：23,55 显示 ViewModel MyViewModel TouchNavigation：诊断：23,55 导航请求 MvxBind：警告：24,20 无法为 MyViewModel.IsValid 绑定 BorderColor 创建目标绑定
没有想法？仍然有这个警告..
您的 LinkerPleaseInclude 不包含对 Border 属性的引用 - 也许您应该尝试添加一些内容？
警告消失了。谢谢斯图尔特

标签： ios binding xamarin mvvmcross

【解决方案1】：

正如 Stuart 所说，在 LinkerPleaseInclude 中包含 Border 属性。

【讨论】：