如何在Xamarin.Forms中检测设备的屏幕方向? [英] How to detect screen orientation of the device in Xamarin.Forms?

问题描述

如何检测Xamarin Forms中的屏幕方向变化?我需要更改方向更改的视图，我应该怎么做才能触发方向更改的更改?提供链接或示例代码将非常有帮助.

How to detect screen orientation change in Xamarin Forms? I need to change the view on orientation change, what should I do to trigger a change on orientation change? Providing a link or sample code would be very helpful.

预先感谢

推荐答案

我尝试了依赖注入，但没有成功.现在，我这样解决了:

I tried it with dependency injection, but no succes yet. Right now, I solved it like this:

• 使用OnSizeAllocated(double, double)可以在方向更改时更改屏幕.
• 使用Singleton存储当前方向.

• Use OnSizeAllocated(double, double) for changing the screen on orientation changes.
• Use a Singleton for storing the current orientation.

Xamarin.Forms页面

protected override void OnSizeAllocated(double width, double height)
{
    base.OnSizeAllocated(width, height);

    if (DeviceInfo.IsOrientationPortrait() && width > height || !DeviceInfo.IsOrientationPortrait() && width < height)
        {
            // Orientation got changed! Do your changes here
        }
}

单人课程

public class DeviceInfo
{
    protected static DeviceInfo _instance;
    double width;
    double height;

    static DeviceInfo()
    {
        _instance = new DeviceInfo();
    }
    protected DeviceInfo()
    {
    }

    public static bool IsOrientationPortrait() 
    {
        return _instance.height > _instance.width;
    }

    public static void SetSize(double width, double height)
    {
        _instance.width = width;
        _instance.height = height;
    }
}

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