将 Xamarin.Forms 度量单位转换为像素 [英] Convert Xamarin.Forms measure units to pixels

问题描述

例如，我如何将 view.WidthRequest 值转换为平台像素?我正在寻找像 Device.ConvertToPixels(10) 这样的方法.

How can I convert, for example, view.WidthRequest value to platform pixels? I'm looking for method like Device.ConvertToPixels(10).

我想用它来绘制 SkiaSharp.例如，我想在(xamarin.forms 单位)中绘制笔划 = 10 的圆，该圆将在绘制时转换为像素.

I want to use it for SkiaSharp drawing. For example I want to draw circle with stroke = 10 in (xamarin.forms units) which will be converted to pixels on draw.

推荐答案

将 MainDisplayInfo.Dencity 乘以 (xamarin.forms 单位) 即可获得像素.

Multiply MainDisplayInfo.Dencity by (xamarin.forms units) and you get that pixels.

我做了一个方法.

    double XamDIUConvertToPixels(double XamDIU)
    {
        var desplayinfo = DeviceDisplay.MainDisplayInfo;
        var pixcels = desplayinfo.Density * XamDIU;
        return pixcels;
    }

DeviceDisplay 必须在 UI 线程上完成，否则 iOS 会抛出异常.

DeviceDisplay must be done on the UI thread or else an exception will be thrown in iOS.

请阅读:https://docs.microsoft.com/en-us/xamarin/essentials/device-display?tabs=ios#platform-differences

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