xcode

Why are my variables empty when I cast them in my iOS application?

由 无人久伴 提交于 2020-12-15 04:14:29
问题 Hi, I am coding an application on Xcode for IOS and I would like to send a variable to another ViewController. The problem is that when I want to send from the controller called "Step1" to set the label of my second view controller called "Step2" . To do this I proceed in this way in "Step 1" : guard let step2 = self.storyboard?.instantiateViewController(withIdentifier: Step2) as? EndConfiguration else { fatalError("Error when trying to get the reference to the Step 2") } step2

Multiple commands produce error GTMSession

由 爱⌒轻易说出口 提交于 2020-12-15 04:14:17
问题 I would like to archive my project so I can upload it to Apple-Connect but I am facing this issue: I also get this these messages: I googled it and I found that this is quite a common issue, which you can usually resolve by deleting a info.plist file from Build Phase . However there is no such a file in the regarding Build Phases . These are my pods for GTM : Build Phase for GTMSessionFetcher-Core : Build Phase for GTMSessionFetcher.default-Core : My podfile : # Uncomment the next line to

Why are my variables empty when I cast them in my iOS application?

由 故事扮演 提交于 2020-12-15 04:12:13
问题 Hi, I am coding an application on Xcode for IOS and I would like to send a variable to another ViewController. The problem is that when I want to send from the controller called "Step1" to set the label of my second view controller called "Step2" . To do this I proceed in this way in "Step 1" : guard let step2 = self.storyboard?.instantiateViewController(withIdentifier: Step2) as? EndConfiguration else { fatalError("Error when trying to get the reference to the Step 2") } step2

Why are my variables empty when I cast them in my iOS application?

由 倾然丶 夕夏残阳落幕 提交于 2020-12-15 04:10:41
问题 Hi, I am coding an application on Xcode for IOS and I would like to send a variable to another ViewController. The problem is that when I want to send from the controller called "Step1" to set the label of my second view controller called "Step2" . To do this I proceed in this way in "Step 1" : guard let step2 = self.storyboard?.instantiateViewController(withIdentifier: Step2) as? EndConfiguration else { fatalError("Error when trying to get the reference to the Step 2") } step2

pod install giving me errors

由 前提是你 提交于 2020-12-15 03:44:16
问题 How can I solve such error? Edit; now I am getting this error pod install pod install [Desktop/release/workspace-ios-develop]$ pod install Ignoring ffi-1.13.1 because its extensions are not built. Try: gem pristine ffi --version 1.13.1 Traceback (most recent call last): 1: from /usr/local/bin/pod:23:in `<main>' /usr/local/bin/pod:23:in `load': cannot load such file -- /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0.rc.1/bin/pod (LoadError) My command history responsible for the problem

Unable to install WebDriverAgentRunner on iPhone(real time device) 14.1

由 我怕爱的太早我们不能终老 提交于 2020-12-15 02:38:50
问题 Appium version :17.1.1-1 Xcode version : 11.3 Real device OS :14.1 I am trying to install the WebDriverAgentRunner on my iPhone which is at OS 14.1 by running the command xcodebuild -project WebDriverAgent.xcodeproj -scheme WebDriverAgentRunner -destination 'id=<device id>' test Getting the below error Error Domain=com.apple.dt.xctest.error Code=9 "Unable to connect to test manager on <deviceID>" UserInfo={NSLocalizedDescription=Unable to connect to test manager on <deviceID>,

iOS多线程的锁,你知道多少？

由 那年仲夏 提交于 2020-12-14 10:08:36
前言 iOS开发中由于各种第三方库的高度封装，对锁的使用很少，刚好之前面试中被问到的关于并发编程锁的问题，都是一知半解，于是决定整理一下关于iOS中锁的知识，为大家查缺补漏。 目录 第一部分： 什么是锁 第二部分： 锁的分类 第三部分： 性能对比 第四部分： 常见的死锁 第五部分： 总结(附 Demo ) 正文 一、什么是锁 在过去几十年并发研究领域的出版物中，锁总是扮演着坏人的角色，锁背负的指控包括引起死锁、锁封护（luyang注：lock convoying，多个同优先级的线程重复竞争同一把锁，此时大量虽然被唤醒而得不到锁的线程被迫进行调度切换，这种频繁的调度切换相当影响系统性能）、饥饿、不公平、data races以及其他许多并发带来的罪孽。有趣的是，在共享内存并行软件中真正承担重担的是——你猜对了——锁。 在计算机科学中，锁是一种同步机制，用于多线程环境中对资源访问的限制。你可以理解成它用于排除并发的一种策略。 if (lock == 0) { lock = myPID; }复制代码 上面这段代码并不能保证这个任务有锁，因此它可以在同一时间被多个任务执行。这个时候就有可能多个任务都检测到lock是空闲的，因此两个或者多个任务都将尝试设置lock，而不知道其他的任务也在尝试设置lock。这个时候就会出问题了。再看看下面这段代码(Swift)： class Account {

程序员必备|Mac开发和编程软件推荐

由 空扰寡人 提交于 2020-12-13 21:49:28
很大一部分Mac用户都是从事软件开发工作的程序员。俗话说得好，工具用得好，编程没烦恼。最近也有不少用户问到Mac开发和编程需要用到哪些常用软件？今天macdown小编就为大家推荐一些Mac开发和编程软件，希望对大家打造高效的 mac 开发环境提供一些帮助！ Mac开发常用软件推荐 Dash：最好用的API文档工具 一款专业的代码文档管理工具，可以让您集中管理API文档，包括离线下载、搜索、查阅，包括各种主流的编程语言和框架，Dash for Mac(代码文档管理工具)内置了丰富的API文档，多达150多种，可以在线下载各种开发API和文档资料，可以帮助开发者快捷的管理代码片段。 Dash for Mac还自带了丰富的API文档，涉及各种主流的编程语言和框架。用户可以把日常使用频繁的代码保存起来，让学习各种编程语言不再是难事！ Alfred：效率神器 想让您的工作效率更高的话，这款快速启动工具Alfred4 Mac版是您的必备！ 它的功能强大，操作简单，能通过快捷键就快速的启动、搜索、查询字典、查看剪贴板等等，简单实用！Alfred4 Mac版不仅能够大大提高工作效率，还有很多其他功能的插件安装使用，为您的工作提供了很大的便捷！ IDE/编辑器软件推荐 Jetbrains 全家桶 说起Mac上的开发工具，当属JetBrAIns出品的一系列开发工具IDE了

SwiftUI textfield color

由 拜拜、爱过 提交于 2020-12-13 19:01:27
问题 any idea how to change the color of the textfield placeholder like the attached picture? I can't find the way to color the text "email" in white, it always stay in grey. i want to make it same like the picture. thanks a lot for the help SecureField(String("Password"), text: $pass).padding(.all).border(Color.white).cornerRadius(3.0).padding(.horizontal) 回答1: Find below a demo of some possible approach. Also might worth considering representable around UITextField as it is much more

Log in with Apple fails on simulator, but works on personal device

由 自古美人都是妖i 提交于 2020-12-13 07:31:18
问题 I am no longer able to log in with my Apple ID to my app on the Xcode simulator after it was previously working as of few days ago. However, I am able to log in fine with a physical device. Sign in with Apple has been enabled for both debug and release. I'm pretty sure that I haven't made any changes my login view controller. After an attempted login, the console prints this: Authorization failed: Error Domain=AKAuthenticationError Code=-7034 "(null)" Thanks in advance for any help! 来源： https
订阅 xcode