Tencent/QMUI_iOS

关于适应系统dark mode的问题

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#1559 opened on Jul 18, 2024

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help wanted

Description

QMUI 版本： 4.7.0

测试机型： iPhone 15 Pro Max 模拟器

系统： 17.5

操作步骤：

1、集成QMUI与QMUI_Demo皮肤相关组件，并将respondsSystemStyleAutomatically设置为YES。

2、打开App。

3、通过系统切换模式。

4、返回App切换TabbarItem或进入二级页面，导航栏颜色异常。

疑问点：

debug后发现由于系统进入后台，导致 QMUIConfiguration.m line: 479 QMUIHelper.canUpdateAppearance 值为NO，无法正确调用 UINavigationBar.qmui_appearanceConfigured.barStyle = navBarStyle;

跟踪发现 QMUIHelper.sharedInstance.shouldPreventAppearanceUpdating 是通过App是否进入后台进行判断，但是这样进入后台的情况下切换系统皮肤、或APP进入后台时，用户手动开启了自动切换深色模式开关时，QMUI是不是就没法正确设置barStyle了呢？

Contributor guide

Tech stack
objective c
Domain
mobileaccessibility
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.
1-3 hours
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.
clear
Prerequisites
Objective CiOS developmentQMUI framework
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70
Research direction
Investigate the logic in QMUIConfiguration.m around line 479, specifically the canUpdateAppearance check. Consider how to properly handle dark mode switching when the app is in the background. Look into UIApplicationState to conditionally allow updates even when in background, or use notifications like UITraitCollectionDidChange. Check if there are existing tests for appearance updating under background state.