MVVMCross以编程方式更改启动ViewModel [英] MVVMCross programmatically change start ViewModel

问题描述

可移植类库定义了开始视图模型.这种情况通常听起来不错，但我正在考虑这一点.您已编写了需要更改其初始屏幕/视图模型的iOS通用应用程序或Android.如果应用程序是电话，则默认视图模型是login，但是如果是平板电脑，则需要其他视图模型作为开始.是否有替代方法或控制方法?

The portable class library defines the start view model. This scenario generally sounds great but I was considering this. You have written a iOS universal application or Android that needs to change its start screen / view model. If application is a phone, the default view model is login but if it is tablet, you want a different view model as the start. Is there an override or a way to take control of this?

推荐答案

请参阅Wiki部分-

See the Wiki section - https://github.com/MvvmCross/MvvmCross/wiki/Customising-using-App-and-Setup#custom-imvxappstart - this has an example of programmatic switching:

如果需要更高级的启动逻辑，则可以使用自定义应用启动-例如

If more advanced startup logic is needed, then a custom app start can be used - e.g.

public class CustomAppStart
    : MvxNavigatingObject
    , IMvxAppStart
{
    public void Start(object hint = null)
    {
        var auth = Mvx.Resolve<IAuth>();
        if (auth.Check())
        {
            ShowViewModel<HomeViewModel>();
        }
        else
        {
            ShowViewModel<LoginViewModel>();
        }
    }
}

然后可以使用以下方法在App中注册:

This can then be registered in App using:

RegisterAppStart(new CustomAppStart());

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