Xamarin.Forms: Prevent dark mode on iOS, Android

To enforce light mode on the following platforms use this code

iOS Solution

Open up you info.plist file and add the following key:

<key>UIUserInterfaceStyle</key> 
<string>Light</string>

Android Solution

Put this code into your MainAcitivity.cs

AppCompatDelegate.DefaultNightMode = AppCompatDelegate.ModeNightNo;
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