Question

目前绑定到“可见性”设置Hidden = true。如何创建一个通用的Visibility绑定，它也会更改约束：将视图高度设置为0？

Answer 1

有关创建绑定的教程，请参阅http://mvvmcross.blogspot.com/

上的N = 28视频

要替换现有的可见性绑定，只需根据https://github.com/MvvmCross/MvvmCross/blob/v3.1/Cirrious/Cirrious.MvvmCross.Binding.Touch/Target/MvxUIViewVisibleTargetBinding.cs

创建自己的类

public class MyUIViewVisibleTargetBinding : MvxBaseUIViewVisibleTargetBinding
{
    public MyUIViewVisibleTargetBinding(UIView target)
        : base(target)
    {
    }

    protected override void SetValueImpl(object target, object value)
    {
        var view = View;
        if (view == null)
            return;

        var visible = value.ConvertToBoolean();
        // your code here
        // - in place of or in addition to:
        // view.Hidden = !visible;
    }
}

并将此注册为Setup使用的最后一步：

protected override void InitializeLastChance()
{
     base.InitializeLastChance();

     var registry = Mvx.Resolve<IMvxTargetBindingFactoryRegistry>();
     registry.RegisterCustomBindingFactory<UIView>("Visible",
                                                    view =>
                                                    new MyUIViewVisibleTargetBinding(view));

}

有关替换现有绑定的更多信息，请参阅MVVMCross Binding decimal to UITextField removes decimal point

请注意，如果您要替换所有Visible个绑定，那么您可能希望替换所有Visible，Visibility和Hidden - 请参阅{{3}中的注册}}

Mvvmcross使用autolayout绑定到Visibility并完全隐藏视图

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