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我二十几岁我好累.jpg，这几个月换完工作后都没时间学习提升了。这里整理一下近期新学到的一点点工程技术——Xcode插件开发。
Xcode插件开发Xcode的插件目前有两种方式：
Xcode Extension (官方发布的一种App Extension，基于XcodeKit框架实现，独立进程）
Xcode Plugin（Xcode8以前的可直接支持的，目前是需要一些特殊手段才能加载运行起来）
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在日常编码工作中肯定会接触一个基础概念——回调。
在计算机程序设计中，回调函数，或简称回调（Callback 即call then back 被主函数调用运算后会返回主函数），是指通过函数参数传递到其它代码的，某一块可执行代码的引用。这一设计允许了底层代码调用在高层定义的子程序。
可以看到回调这个概念实际上是编程思想中依赖翻转（Dependency Injection）设计原则的体现。
在不同
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<a class="post-title-link" href="/archives/3d1fb5d7.html" itemprop="url">从ARKit上找到你的人脸</a></h1>
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这几年Apple一致再大力推动AR这个方向的应用，正好我对于AR渲染、人脸检测等技术应用都有一些兴趣，这里就利用这个ARKitDemo工程来探究一下ARKit的人脸跟踪的能力。
在Apple的Tracking and Visualizing Faces工程中内置了一张2048*2048的2D标准Facemesh，在常规的人脸贴图应用就可以通过这张Facemesh来制作特定的效果。
后来发现ARKi
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这篇文档用于总结日常工作中如何分析Crash Report的一些思路，首先我们可以从官方文档得到一些关于Crash Report的基本情况。
一份完整的Crash Report(已符号化过)中包含的几部分信息中，头部描述信息和线程调用堆栈是我们最为关注的两个部分。
通过这两部分可以获知这次崩溃现场的触发原因和线程回溯，然后通过这些信息我们就可以开始动手修复这份Crash了。接下来先来看几类在工作中
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<a class="post-title-link" href="/archives/4397956c.html" itemprop="url">iOS中的并发编程与GCD的一些认知</a></h1>
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在现代的计算机系统中CPU是多核多线程的架构，理论上我们可以在同一时间同时执行多条指令。而在软件设计中为了达到这个目的就发明了许多的并发编程方案。
其中在iOS中主要存在四个并发编程方案：pthread、NSThread、GCD、NSOperation。这里借用以下这张图来描述它们各自的主要特征。可以看到pthread和NSThread实际上就是线程这个概念在iOS中的抽象，使用这两个库需要开发者
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