xamarin/Xamarin.Forms

[Bug] Setting Frame ControlTemplate causes the whole page to be blank

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#9,480 创建于 2020年2月8日

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a/framee/2 :clock2:help wantedp/UWPt/bug :bug:up-for-grabs

描述

When trying to set ControlTemplate of a Frame, all other elements will disappear, no errors thrown

Steps to Reproduce

<Frame>
	<Label Text="This is from templated content" />
	<Frame.ControlTemplate>
		<ControlTemplate>
			<Grid BackgroundColor="Red">
				<ContentPresenter />
			</Grid>
		</ControlTemplate>
	</Frame.ControlTemplate>
</Frame>

Expected Behavior

All element to keep appearing on the page, and also the frame to be templated as it is a ContentView

Actual Behavior

The control template is not applied, and all other elements on the page will disappear

Project

FrameControlTemplate.zip

贡献者指南

技术栈
csharp
领域
mobilefrontend
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
1-3 hours
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
C#XAMLXamarin.Forms basics
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
50
研究方向
Investigate the Frame control template rendering in Xamarin.Forms. The bug occurs when a Frame's ControlTemplate is set, causing all other page elements to disappear. Start by examining the Frame's default template and how ContentPresenter is used. Look at the FrameRenderer in platform specific code (e.g., iOS, Android) to see if the template is applied correctly. Consider whether the issue relates to the VisualStateManager or layout cycle. Check linked comments for any hints or partial fixes.
[Bug] Setting Frame ControlTemplate causes the whole page to be blank · xamarin/Xamarin.Forms#9480 | Good First Issue