[Bug] Xamarin.Forms 5.0: RadioButton content layout on iOS

[davidbritch]

Description

In Xamarin.Forms 5.0.0.1558-pre3, RadioButton content was left aligned by default on iOS and Android:

iOS:

Android:

This is based on the following code, which doesn't set any alignment options:

        <RadioButton Content="Cat"
                     CheckedChanged="OnAnimalRadioButtonCheckedChanged" />
        <RadioButton Content="Dog"
                     CheckedChanged="OnAnimalRadioButtonCheckedChanged" />
        <RadioButton Content="Elephant"
                     CheckedChanged="OnAnimalRadioButtonCheckedChanged" />
        <RadioButton Content="Monkey"
                     IsChecked="True"
                     CheckedChanged="OnAnimalRadioButtonCheckedChanged" />

However, in Xamarin.Forms 5.0.0.1874, RadioButton content is centred by default on iOS:

On Android, the content is still left-aligned by default.

I tried different pre-releases and the RadioButton content became centred by default on iOS in 5.0.0.1709-pre4.

Steps to Reproduce

1. Run the attached sample.
2. Browse to the "Basic RadioButtons" page on iOS.

Expected Behavior

RadioButton content is left-aligned by default.

Actual Behavior

RadioButton content is centred by default.

Basic Information

• Version with issue: 5.0.0.1874
• Last known good version: 5.0.0.1558-pre3
• Platform Target Frameworks:
  • iOS: 14.2

Environment

Show/Hide Visual Studio info

=== Visual Studio Enterprise 2019 for Mac ===

Version 8.8.4 (build 30)
Installation UUID: e691732d-c462-4fe8-b688-f13ac2cc1ab3
	GTK+ 2.24.23 (Raleigh theme)
	Xamarin.Mac 6.18.0.23 (d16-6 / 088c73638)

	Package version: 612000113

=== Mono Framework MDK ===

Runtime:
	Mono 6.12.0.113 (2020-02/4fdfb5b1fd5) (64-bit)
	Package version: 612000113

=== Roslyn (Language Service) ===

3.8.0-5.20519.18+4c195c3ac1974edcefa76774d7a59a2350ec55fa

=== NuGet ===

Version: 5.8.0.6860

=== Xamarin Designer ===

Version: 16.8.0.510
Hash: 44e3f3ce9
Branch: remotes/origin/d16-8
Build date: 2020-12-10 00:06:14 UTC

=== .NET Core SDK ===

SDK: /usr/local/share/dotnet/sdk/5.0.101/Sdks
SDK Versions:
	5.0.101
	5.0.100
	3.1.404
	3.1.403
	3.1.402
	3.1.401
	3.1.302
	3.1.301
	3.1.300
	3.1.202
	3.1.200
	3.1.102
	3.1.101
	3.1.100
	3.0.101
	3.0.100
	2.1.701
	2.1.700
MSBuild SDKs: /Applications/Visual Studio.app/Contents/Resources/lib/monodevelop/bin/MSBuild/Current/bin/Sdks

=== .NET Core Runtime ===

Runtime: /usr/local/share/dotnet/dotnet
Runtime Versions:
	5.0.1
	5.0.0
	3.1.10
	3.1.9
	3.1.8
	3.1.7
	3.1.6
	3.1.5
	3.1.4
	3.1.2
	3.1.1
	3.1.0
	3.0.1
	3.0.0
	2.1.23
	2.1.22
	2.1.21
	2.1.20
	2.1.19
	2.1.18
	2.1.17
	2.1.16
	2.1.15
	2.1.14
	2.1.13
	2.1.12
	2.1.11

=== .NET Core 3.1 SDK ===

SDK: 3.1.404

=== Xamarin.Profiler ===

Version: 1.6.12.26
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler

=== Updater ===

Version: 11

=== Xamarin.Android ===

Version: 11.1.0.17 (Visual Studio Enterprise)
Commit: xamarin-android/d16-8/c0e2b8e
Android SDK: /Users/davidbritch/Library/Developer/Xamarin/android-sdk-macosx
	Supported Android versions:
		7.0 (API level 24)
		8.1 (API level 27)

SDK Tools Version: 26.1.1
SDK Platform Tools Version: 30.0.4
SDK Build Tools Version: 30.0.2

Build Information: 
Mono: be2226b
Java.Interop: xamarin/java.interop/d16-8@79d9533
ProGuard: Guardsquare/proguard/proguard6.2.2@ebe9000
SQLite: xamarin/sqlite/3.32.1@1a3276b
Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-8@2fb1cbc

=== Microsoft OpenJDK for Mobile ===

Java SDK: /Users/davidbritch/Library/Developer/Xamarin/jdk/microsoft_dist_openjdk_1.8.0.25
1.8.0-25
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL

=== Android SDK Manager ===

Version: 16.8.0.32
Hash: 01a7774
Branch: remotes/origin/d16-8
Build date: 2020-12-10 00:32:24 UTC

=== Android Device Manager ===

Version: 16.8.0.46
Hash: 0a81419
Branch: remotes/origin/d16-8
Build date: 2020-12-10 00:32:44 UTC

=== Apple Developer Tools ===

Xcode 12.2 (17535)
Build 12B45b

=== Xamarin.Mac ===

Version: 7.0.0.15 (Visual Studio Enterprise)
Hash: 87a1b18d8
Branch: d16-8
Build date: 2020-11-16 21:39:40-0500

=== Xamarin.iOS ===

Version: 14.6.0.15 (Visual Studio Enterprise)
Hash: 87a1b18d8
Branch: d16-8
Build date: 2020-11-16 21:39:41-0500

=== Build Information ===

Release ID: 808040030
Git revision: eaa21a8983aa5c4bcf6a665892478b4f3d413418
Build date: 2020-12-10 11:06:12-05
Build branch: release-8.8
Xamarin extensions: eaa21a8983aa5c4bcf6a665892478b4f3d413418

=== Operating System ===

Mac OS X 10.15.4
Darwin 19.4.0 Darwin Kernel Version 19.4.0
    Wed Mar  4 22:28:40 PST 2020
    root:xnu-6153.101.6~15/RELEASE_X86_64 x86_64

Reproduction Link

RadioButtonDemos.zip

Workaround

Set HorizontalOptions to Start:

<RadioButton Content="Cat" HorizontalOptions="Start"  />