cocoa | 易学教程

CocoaPods could not find compatible versions for pod “GoogleDataTransportCCTSupport”

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问题 I've installed Firebase In App Messaging according to the guide: https://rnfirebase.io/in-app-messaging/usage When I run pod install , I get this: Using firebase.json from '/../app/firebase.json' Adding a custom script phase for Pod RNFBApp: [RNFB] Core Configuration Adding a custom script phase for Pod RNFBCrashlytics: [RNFB] Crashlytics Configuration Detected React Native module pods for RNFBAnalytics, RNFBApp, RNFBCrashlytics, RNFBDynamicLinks, and RNFBInAppMessaging Updating local specs

2020年面向高级开发人员的iOS面试题总结（附答案）

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前言：欢迎关注我的简书查看更多好文章这是许多硅谷公司用来衡量iOS候选人资历水平的一系列问题。这些问题涉及iOS开发的各个方面，旨在触及对平台的广泛理解。毕竟，高级开发人员应该能够从头到尾地发布完整的iOS产品。这绝不是一个详尽的列表，但它可以帮助你为即将到来的技术iOS面试做准备。目录你使用的最新版本的iOS是什么？你喜欢什么，为什么？什么是iOS应用程序，你的代码适合哪里？你喜欢或不喜欢什么Swift特性？为什么？内存管理在iOS上如何处理？你对单身人士有什么了解？你会在哪里使用一个，你不在哪里？你能否解释一下Delegate和KVO有什么不同？ iOS应用中通常使用哪些设计模式？你知道除了常见的可可模式外还有哪些设计模式？你能否解释并展示SOLID原则的例子？你有什么选择在iOS上实现存储和持久性？你有什么选择在iOS上实现网络和HTTP？如何以及何时需要在iOS上序列化和映射数据？在iOS上布置UI有什么选择？你将如何优化动态大小的表或集合视图的滚动性能？你将如何在iOS上执行异步任务？你如何管理依赖关系？你如何在iOS上调试和配置文件？你有TDD经验吗？你如何在iOS上进行单元和UI测试？你编码审查和/或配对计划？在下面的章节中，我们将讨论每个问题，背后的原因，预期的答案，以及可能为面试官带来危险的答案。 1

【面试题资源共享】一文总结最高频软件测试|sq|语句|思维发散|计算机基础|Linux|测试用例|接口测试|等技术面试题

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思维发散 1.一个球， -把尺子长度是球直径的2/3,怎样测出半径? 2.四枚硬币，花面朝上，每次翻转三个，几次可以将四枚硬币变为字面朝上? 3. U2合唱团在1 7分钟内赶到演唱会现场问题? 4.小明一家过桥，黑夜? 5.一名军官要求24名士兵占成6排? 6.一只笔有什么用途，想象力发散一下? 7.有两根各段都不均匀的绳子，和一个打火机? 8.甲卖铅笔，成本是28元，卖31元。-天乙上甲那买铅笔，给了甲100元，甲没有零钱，于是和丙换了10元的零钱后找到乙69元。过了一-会，丙说刚才甲和他换的100元是假的，于是甲只好给了丙一张真的100元。问甲在整个交易中损失了多少? 9.时钟的指针一天内会重合几次? 10.有两个奇怪的村庄A和B，A村的人每周- - -三五说谎，B村的人每周二四六说谎，其他的日子里他们都说真话。某天有个外地人来到这里，碰到两个人，并分别向他们提出关于日期的问题，两个人都说“前天是我说谎的日子”。如果这两个人分别来自A和B村，那么这一天最有可能是星期几? 11.有三顶黑帽子、两顶白帽子.A、B、C三个人在黑暗中分别拿- -顶戴上.开灯后每个人是看不到自己帽子的.A看了其他两个人之后无法判断自己帽子颜色,于是说不知道: B看了其他两人之后也说自己不知道自己帽子颜色: C本来也判断不出自己帽子颜色,但听了A和B的话后,C说可以判断自己的帽子颜色了.A、B

OS X终端中是否有任何方法可以逐字移动光标？

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问题： I know the combination Ctrl + A to jump to the beginning of the current command, and Ctrl + E to jump to the end. 我知道组合Ctrl + A跳转到当前命令的开头，而Ctrl + E跳转到结尾。 But is there any way to jump word by word, like Alt + ← / → in Cocoa applications does? 但有没有办法逐字逐句跳转，比如Alt + ← / →在Cocoa应用程序中呢？解决方案：参考一： https://stackoom.com/question/L8q/OS-X终端中是否有任何方法可以逐字移动光标参考二： https://oldbug.net/q/L8q/Is-there-any-way-in-the-OS-X-Terminal-to-move-the-cursor-word-by-word 来源： oschina 链接： https://my.oschina.net/u/3797416/blog/4333272

Cocoa Autolayout：内容拥抱与内容压缩阻力优先

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问题： I can't find a clear answer on Apple documentation regarding Cocoa Autolayout about the difference between content hugging and compression resistance. 关于Cocoa Autolayout关于内容拥抱和抗压缩性之间差异的Apple文档，我找不到明确的答案。 Can somebody explain their usages and difference ? 有人可以解释他们的用法和差异吗？解决方案：参考一： https://stackoom.com/question/14VPt/Cocoa-Autolayout-内容拥抱与内容压缩阻力优先参考二： https://oldbug.net/q/14VPt/Cocoa-Autolayout-content-hugging-vs-content-compression-resistance-priority 来源： oschina 链接： https://my.oschina.net/u/3797416/blog/4365952

CALayer delegate methods not called on layer hosted view

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问题 I have this layer hosted view, which is initialised like so: // Init layers self.wantsLayer = YES; _hostedLayer = [CALayer layer]; _hostedLayer.delegate = self; self.layer = _hostedLayer; Weirdly, the delegate method updateLayer is not called. When I comment out the last 3 lines, it does get called. What's wrong here? Hint: Yes I have overridden wantsUpdateLayer and return YES . 回答1: When a view asks for a layer it gets a special, private subclass of CALayer by default, which has extra

CALayer delegate methods not called on layer hosted view

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Objective-C: Check Firewall status in OSX?

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问题 My objective-c app needs to be aware if the firewall in OSX is running, so it can tell the user to turn it off or create a new rule. Also, is it possible to create rules directly from my app so users never need to handle networking issues? John 回答1: I am writing a function that will provide you the status of OSX firewall :) -(BOOL)getFirewallStatus{ NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSSystemDomainMask, YES); NSString *path = [paths objectAtIndex:0]; path

Drawing varying line widths with NSBezierPath?

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问题 I would like to create a vector object that can be drawn with a pen tablet and will honor the pressure information from the pen (by increasing/decreasing line width appropriately). Now I know how to get the pressure info out of the NSEvent, but of course NSBezierPath doesn't support varying line widths. So I'm trying to generate a Bezier path that is the outline of my line, by calculating the perpendicular lines at the ends of the curve and connecting those with the very same curve. It nearly

Programmatically create an NSViewController without an XIB in Swift 3

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问题 I'm trying to make a macOS app without using Interface Builder. My project builds and runs, but my primary view controller doesn't seem to be loading its view. That is, the viewDidLoad() method is not invoked. I'm using Xcode-beta 8.0 beta 6 (8S201h). The Swift 3 documentation for NSViewController says this about the view property: If this property’s value is not already set when you access it, the view controller invokes the loadView() method. That method, in turn, sets the view from the nib

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