[Bug, iOS] Tabbed Page TabBar leaving blank space when hidden.

(6 条评论) (1 个反应) (0 位负责人)C# (1,926 个派生)batch import

e/2 :clock2:good first issuehackathonhelp wantedinactivep/iOS 🍎t/bug :bug:up-for-grabs

仓库指标

星标: (5,644 个星标)
PR 合并指标: (30 天内没有已合并 PR)

描述

Description

When using a Tabbed Page custom renderer, a blank space will be left where the Tab Bar was when the TabBar.Hidden property is set to true. Also, the TabBar frame's height is being reset somewhere between ViewWillAppear and ViewDidAppear. TabBar height can be forced to 0 by overriding the View property and setting the TabBar frame height to 0.

Steps to Reproduce

Create a Tabbed Page Custom Renderer.
Set the TabBar.Hidden property to true in the constructor.
Set the TabBar.Frame height to 0 in the ViewWillAppear method.

Expected Behavior

Tab Bar is not visible, page stretches to fill now empty space.

Actual Behavior

Tab Bar is hidden, page does not stretch leaving a blank space where the Tab Bar was.

Basic Information

Version with issue: 4.2.0.709249
IDE: Visual Studio 2019
Platform Target Frameworks:
- iOS: 13.1
Nuget Packages:
Affected Devices: iPhone 8 Plus, iPhone 11 Pro

Screenshots

Reproduction Link

https://github.com/Nathan-Coit/XamarinHideTabbarTest/tree/master/TabBarTestApp

贡献者指南

研究方向: 该问题出现在 TabbedPage 的 iOS 自定义渲染器中。请研究 Xamarin.Forms iOS 渲染器源代码，特别是 Xamarin.Forms.Platform.iOS 项目中的 `TabbedRenderer` 类。该 Bug 表明设置 `TabBar.Hidden = true` 不会导致页面重新调整大小，并且 TabBar 的框架高度在 ViewWillAppear 和 ViewDidAppear 之间被重置。请检查渲染器中 `ViewWillAppear` 和 `ViewDidAppear` 重写方法内的布局逻辑，并考虑重写 `ViewDidLayoutSubviews` 来修正框架。可以使用位于 https://github.com/Nathan Coit/XamarinHideTabbarTest 的复现仓库来测试修复。
技术栈: csharpios
领域: mobile
议题类型: 缺陷
难度: 2
预计时间: 1-3 小时
活动状态: 活跃
清晰度: 清晰
前置要求: GitXamarin.FormsiOS Development
新手友好度: 65