IOS9输出UIK的提示存在崩溃问题的风险

2023-10-28 13:30

本文主要是介绍IOS9输出UIK的提示存在崩溃问题的风险,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!

最近做项目升级了Xcode到7.1.1,突然出现了这个问题,而且容易导致程序崩溃,经过查询顺利解决,记录如下;

1:问题:This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes.  This will cause an exception in a future release.

2:只需要把UI的崩溃的部分添加到dispatch_async(dispatch_get_main_queue(), ^(void){ <code> });内部即可;


相关资料如下:

This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes

up vote 9 down vote favorite
4

I get this log in the console when I am running my application in is simulator. Haven't seen this in iOS 8. I am not quite sure whats causing this. Has anyone else come across the same issue and if so how was it fixed? or is there any help anyone can provide in regards to this?

share improve this question
 

1 Answer

active oldest votes
up vote 19 down vote accepted

Do not change UI from anything but the main thread. While it may appear to work on some OS or devices and not others, it is bound to make your application unstable, and crash unpredictably.

If you must respond to a notification, which can happen in the background, then ensure UIKitinvocation takes place on the main thread.

You at least have these 2 options:

Asynchronous Dispatch

Use GCD (Grand Central Dispatch) if your observer can be notified on any thread. You can listen and do work from any thread, and encapsulate UI changes in a dispatch_async:

dispatch_async(dispatch_get_main_queue()) {// Do UI stuff here
}

When to use GCD? When you do not control who sends the notification. It can be the OS, a Cocoapod, embedded libraries, etc. Using GCD will woke anytime, every time. Downside: You find yourself re-scheduling the work.


Listen on Main Thread

Conveniently, you can specify on which thread you want the observer to be notified, at the time you are registering for notifications, using the queue parameter:

addObserverForName:@"notification"object:nilqueue:[NSOperationQueue mainQueue]usingBlock:^(NSNotification *note){// Do UI stuff here}

When to observe on main thread? When you are both registering and registered. Bu the time you respond to the notification, you are already where you need to be.


Post Notification On Main Thread

[self performSelectorOnMainThread:@selector(postNotification:) withObject:notification waitUntilDone:NO];

Hybrid solution which does not guarantee that the observer is only invoked from said method. It allows for lighter observer, at the cost less robust design. Only mentioned here as a solution you should probably avoid.

share improve this answer
 
 
so we do make a couple of updates on the UI when we hear a notification, so are you saying that I need to make those updates inside "dispatch_async(dispatch_get_main_queue()"? –  Shabarinath Pabba  Aug 11 at 21:16
 
Exactly. I have added examples. –  SwiftArchitect  Aug 11 at 21:24
 
alrighty, trying this now and will choose yours as an answer if it fixed it :D –  Shabarinath Pabba  Aug 11 at 21:27
 
why was this not required in iOS 8?, why does this happen in iOS 9? –  Shabarinath Pabba  Aug 11 at 21:29
1 
It was best practice well before iOS 8 - Apple has just chosen iOS 9 to start warning of improper updates, and, as the error states, will soon being disallowing UI updates on a background thread entirely. –  Scott Austin  Sep 17 at 15:02




相关链接:http://stackoverflow.com/questions/31951704/this-application-is-modifying-the-autolayout-engine-from-a-background-thread-wh









这篇关于IOS9输出UIK的提示存在崩溃问题的风险的文章就介绍到这儿,希望我们推荐的文章对编程师们有所帮助!



http://www.chinasem.cn/article/293537

相关文章

Vue3绑定props默认值问题

《Vue3绑定props默认值问题》使用Vue3的defineProps配合TypeScript的interface定义props类型,并通过withDefaults设置默认值,使组件能安全访问传入的... 目录前言步骤步骤1:使用 defineProps 定义 Props步骤2:设置默认值总结前言使用T

从基础到高级详解Python数值格式化输出的完全指南

《从基础到高级详解Python数值格式化输出的完全指南》在数据分析、金融计算和科学报告领域,数值格式化是提升可读性和专业性的关键技术,本文将深入解析Python中数值格式化输出的相关方法,感兴趣的小伙... 目录引言:数值格式化的核心价值一、基础格式化方法1.1 三种核心格式化方式对比1.2 基础格式化示例

Web服务器-Nginx-高并发问题

《Web服务器-Nginx-高并发问题》Nginx通过事件驱动、I/O多路复用和异步非阻塞技术高效处理高并发,结合动静分离和限流策略,提升性能与稳定性... 目录前言一、架构1. 原生多进程架构2. 事件驱动模型3. IO多路复用4. 异步非阻塞 I/O5. Nginx高并发配置实战二、动静分离1. 职责2

解决升级JDK报错:module java.base does not“opens java.lang.reflect“to unnamed module问题

《解决升级JDK报错:modulejava.basedoesnot“opensjava.lang.reflect“tounnamedmodule问题》SpringBoot启动错误源于Jav... 目录问题描述原因分析解决方案总结问题描述启动sprintboot时报以下错误原因分析编程异js常是由Ja

MySQL 表空却 ibd 文件过大的问题及解决方法

《MySQL表空却ibd文件过大的问题及解决方法》本文给大家介绍MySQL表空却ibd文件过大的问题及解决方法,本文给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友参考... 目录一、问题背景:表空却 “吃满” 磁盘的怪事二、问题复现:一步步编程还原异常场景1. 准备测试源表与数据

解决Nginx启动报错Job for nginx.service failed because the control process exited with error code问题

《解决Nginx启动报错Jobfornginx.servicefailedbecausethecontrolprocessexitedwitherrorcode问题》Nginx启... 目录一、报错如下二、解决原因三、解决方式总结一、报错如下Job for nginx.service failed bec

SysMain服务可以关吗? 解决SysMain服务导致的高CPU使用率问题

《SysMain服务可以关吗?解决SysMain服务导致的高CPU使用率问题》SysMain服务是超级预读取,该服务会记录您打开应用程序的模式,并预先将它们加载到内存中以节省时间,但它可能占用大量... 在使用电脑的过程中,CPU使用率居高不下是许多用户都遇到过的问题,其中名为SysMain的服务往往是罪魁

MySQ中出现幻读问题的解决过程

《MySQ中出现幻读问题的解决过程》文章解析MySQLInnoDB通过MVCC与间隙锁机制在可重复读隔离级别下解决幻读,确保事务一致性,同时指出性能影响及乐观锁等替代方案,帮助开发者优化数据库应用... 目录一、幻读的准确定义与核心特征幻读 vs 不可重复读二、mysql隔离级别深度解析各隔离级别的实现差异

C++ vector越界问题的完整解决方案

《C++vector越界问题的完整解决方案》在C++开发中,std::vector作为最常用的动态数组容器,其便捷性与性能优势使其成为处理可变长度数据的首选,然而,数组越界访问始终是威胁程序稳定性的... 目录引言一、vector越界的底层原理与危害1.1 越界访问的本质原因1.2 越界访问的实际危害二、基

Python多线程应用中的卡死问题优化方案指南

《Python多线程应用中的卡死问题优化方案指南》在利用Python语言开发某查询软件时,遇到了点击搜索按钮后软件卡死的问题,本文将简单分析一下出现的原因以及对应的优化方案,希望对大家有所帮助... 目录问题描述优化方案1. 网络请求优化2. 多线程架构优化3. 全局异常处理4. 配置管理优化优化效果1.