xamarin/Xamarin.Forms

[Bug] Inconsistent Xamarin Forms frame background color

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#5,950 opened on Apr 18, 2019

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Description

Description While I was designing an application with Xamarin.Forms I realized that the Android version is unable to reproduce a hexadecimal color with accuracy, the color shows it with less intensity with respect to the real color, however, the IOS version reproduces the color perfectly.

The problem is explained in the following repository: "In Xamarin Forms on iOS, the frame control background color does not match the color of other elements due to differences between CGColor and UIColor.

Most iOS renderers work using UIKit and UIColor. The background color for instance is set using UIView.BackgroundColor.

Frame however works using CoreGraphics and CGColor and manipulating a view's layer. The background color is set using UIView.Layer.BackgroundColor."

Steps to Reproduce

  1. Compare the color differences between a Android and IOS.

Expected Behavior That colors appear the same on all devices.

Actual Behavior Currently there are differences in color contrast depending on the device in which it is executed.

Basic Information

  • Version with issue: 3.6.0.344457 and previous versions.
  • Platform Target Frameworks: Android: 8.1, 9

Application example where the problem is reproduced: https://github.com/GalaxiaGuy/xamarin-forms-frame-color

Contributor guide

Research direction
Compare the iOS and Android custom renderers for the Frame control, specifically how background color is set. Investigate the difference between UIView.BackgroundColor (iOS) and UIView.Layer.BackgroundColor (iOS) and how Android handles color via native views. Look for any existing workarounds or fixes in Xamarin.Forms source code.
Tech stack
csharp
Domain
mobile
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
Xamarin.Forms basic knowledgeUnderstanding of iOS/Android rendering differences
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50