[Enhancement] Allow to override _minimumButtonHeight in ButtonRenderer

[softlion]

Description

A Button on iOS seems to ignore vertical padding set to 0.

Steps to Reproduce

1. Create a Button, set a 0 vertical padding

Expected Behavior

0 vertical padding

Actual Behavior

The button height is 44 points.

Because the ButtonRenderer sets a minimumHeight to 44f.
From Xamarin.Forms.Platform.iOS.ButtonRenderer:

		// This looks like it should be a const under iOS Classic,
		// but that doesn't work under iOS 
		// ReSharper disable once BuiltInTypeReferenceStyle
		// Under iOS Classic Resharper wants to suggest this use the built-in type ref
		// but under iOS that suggestion won't work
		readonly nfloat _minimumButtonHeight = 44; // Apple docs 

                nfloat IButtonLayoutRenderer.MinimumHeight => _minimumButtonHeight;

Basic Information

• Version with issue: 4.8.0.1560
• Last known good version: none
• IDE: Rider
• Platform Target Frameworks:
  • iOS 13:
• Nuget Packages: Xamarin.Forms
• Affected Devices: all

Workaround

None, as methods that could be overriden are all internals.

[rmarinho]

I think this is related with the design guidelines for iOS , we can't remove that as it would be a breaking change for everyone.

[softlion]

@rmarinho I don't ask you to remove that. I'm asking you to make that customizable :)

[rmarinho]

Ok, i updated the description