如何以编程方式更改赢8.1或Win 10 UWP应用的背景主题？ [英] How to programmatically change background theme of Win 8.1 or Win 10 UWP app?

问题描述

我对Windows Phone的8.1的应用程序，它的一个UWP版本。我想动态改变时，它在Windows中被改变了应用程序的背景

I have an app for Windows Phone 8.1 and a UWP version of it. I'd like to change the background of the apps dynamically when it is changed in Windows.

使用情况是：

1. 启动应用程序，主题背景是黑色的。


2. 在手机上按home键


3. 更改背景主题，以光


4. 返回到应用程序（基本上切换到它在后台）


5. 应用程序的主题将自动更改新的主题

1. Start the app, the background theme is dark.
2. Press the home button on the phone
3. Change the background theme to light
4. Go back to the app (basically switch to it from the background)
5. The theme of the app would change automatically to the new theme

我想它就像这样，没有重新启动。我已经看到了这个在其他应用程序，所以它有可能以某种方式，但我想不通。

I'd like it to be done like this, without a restart. I've seen this in other apps, so it has to be possible somehow, but I can't figure out.

如果需要重新启动，这是太精作为b液。

If a restart is required, that is fine too as solution B.

感谢。

推荐答案

我会建议创建的设置将存储AppTheme状态并实现INotifyPropertyChanged接口

I would suggest to create settings singleton class that will store AppTheme state and implements INotifyPropertyChanged interface

public class Settings : INotifyPropertyChanged
{
    private static volatile Settings instance;
    private static readonly object SyncRoot = new object();
    private ElementTheme appTheme;

    private Settings()
    {
        this.appTheme = ApplicationData.Current.LocalSettings.Values.ContainsKey("AppTheme")
                            ? (ElementTheme)ApplicationData.Current.LocalSettings.Values["AppTheme"]
                            : ElementTheme.Default;
    }

    public static Settings Instance
    {
        get
        {
            if (instance != null)
            {
                return instance;
            }

            lock (SyncRoot)
            {
                if (instance == null)
                {
                    instance = new Settings();
                }
            }

            return instance;
        }
    }

    public ElementTheme AppTheme
    {
        get
        {
            return this.appTheme;
        }

        set
        {
            ApplicationData.Current.LocalSettings.Values["AppTheme"] = (int)value;
            this.OnPropertyChanged();
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

比，您可以创建页面属性设置，那将返回单值并结合RequestedTheme页到AppTheme财产

Than, you can create Property Settings on page, that will return value of singleton and bind RequestedTheme of Page to AppTheme property

<Page
    x:Class="SamplePage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    RequestedTheme="{x:Bind Settings.AppTheme, Mode=OneWay}">

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