标签插件和 Front-matter 中的标签不同，它们是用于在文章中快速插入特定内容的插件。
在文章中插入引言，可包含作者、来源和标题。
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{% blockquote %} Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque hendrerit lacus ut purus iaculis feugiat. Sed nec tempor elit, quis aliquam neque. Curabitur sed diam eget dolor fermentum semper at eu lorem. {% endblockquote %}
Kindle伴原文 Resilio Sync同步密钥 {% codeblock lang:basnh %} BOC3NIGPF2DOKETOF2FAHXJXE2HF24QWC {% endcodeblock %}
精品库 {% iframe https://kindlefere.github.io/share/ebook/ 800 400 %}
每周一书 {% iframe https://kindlefere.github.io/share/weekly/index.html 800 400 %}
国外精选 {% iframe https://kindlefere.github.io/share/ebook-en/index.html 800 400 %}
Resilio Sync 这款软件的优点上面已经说了一些，就是不依赖中心服务器，所有的文件都分布在用密钥连接在一起的电脑上。这里重点说一下小伙伴们关心的缺点。
总结了AR开发的平台汇总，AR视频经典教程，AR主流资讯网站，Vuforia，EasyAR一些实例教程以及AR精选应用。
Vuforia–不用多说，最流行的AR应用开发引擎。 EasyAR－－EasyAR是国内最专业的AR引擎,是国内首款投入应用的AR SDK。EasyAR是好用且免费的增强现实(Augmented Reality)开发者引擎。 HiAR–HiAR 增强现实开发平台 HiAR 是亮风台信息科技打造的新一代移动增强现实(AR)开发平台,提供一整套世界领先的增强现实(AR)技术服务。 太虚AR－－成都米有网络科技有限公司自主研发集成于Unity3d实现增强现实的SDK开发包,虚拟现实SDK太虚官方网站。 Wikitude–Wikitude是一家专门从事智能手机增强现实的应用，分别出品了两款应用Wikitude drive与Wikitude World Browser。 Inter RealSense–RealSense 3D是一套感知计算解决方案,包括世界上最小的3D摄像头,模块比两个硬币摞起来还薄,除了硬件外,英特尔还将提供驱动及软件等全套开发工具 ICreator–依托于iCreator 3D, VR引擎,模型师可以快速创建交互式3D, VR内容,并支持微信平台传播,也为模型师提供可视化3D模型交易功能。 天眼－－天眼AR包括天眼云平台和天眼AR浏览器,用户需在天眼云平台完成“AR内容”制作,然后在天眼AR浏览器查看效果。 Google Tango–小编重点推荐。运动追踪(Motion Tracking)，深度感知(Depth Perception)和区域学习(Area Learning)。
在正式开始之前，我期望你能对iOS/Mac OS X平台开发有所了解，在iOS开发中已经很少需要自己写复杂的算法了，一般情况下很少会在面试中出现算法的考核，如果你了解一些基础的算法，还是有帮助的。
SVN was a great advance in its day, but it’s now clear that distributed version control systems are the way forward and that Git is the de facto standard. Having helped many clients migrate from SVN to Git, here are my notes for a pain-free transition that will preserve the tags and branches in your SVN repository.
{% codeblock 新建目录 lang:bash http://www.sailmaker.co.uk/blog/2013/05/05/migrating-from-svn-to-git-preserving-branches-and-tags-3/#import-staging Create a local staging directory%} cd ~ mkdir staging cd staging {% endcodeblock %}
Error handling is the process of responding to and recovering from error conditions in your program. Swift provides first-class support for throwing, catching, propagating, and manipulating recoverable errors at runtime. Some operations aren’t guaranteed to always complete execution or produce a useful output. Optionals are used to represent the absence of a value, but when an operation fails, it’s often useful to understand what caused the failure, so that your code can respond accordingly. As an example, consider the task of reading and processing data from a file on disk. There are a number of ways this task can fail, including the file not existing at the specified path, the file not having read permissions, or the file not being encoded in a compatible format. Distinguishing among these different situations allows a program to resolve some errors and to communicate to the user any errors it can’t resolve. 举例，在读取和处理磁盘上的一个文件的数据时，会有有许多方法失败，包括指定的文件路径找不到，没有文件的读取权限，或文件编码格式不兼容。在这些不同情况下，就可以让程序提示用户导致程序无法执行的具体原因。
In Swift, errors are represented by values of types that conform to the Error protocol. This empty protocol indicates that a type can be used for error handling. 在swift中，错误类型是遵循Error 协议。
Swift enumerations are particularly well suited to modeling a group of related error conditions, with associated values allowing for additional information about the nature of an error to be communicated. For example, here’s how you might represent the error conditions of operating a vending machine inside a game: swift枚举类型特别适合为一组错误条件建模，用来关联导致错误的真正原因的相关信息。例如： 一个在操作一台游戏机时的会出现的错误枚举类：
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Throwing an error lets you indicate that something unexpected happened and the normal flow of execution can’t continue. You use a throw statement to throw an error. For example, the following code throws an error to indicate that five additional coins are needed by the vending machine: 抛出错误说明游戏出现异常，导致其他操作无法进行。这是需要通过Throw语句来抛出这个错误。例如，以下代码抛出了一个错误表明需要five：
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When an error is thrown, some surrounding piece of code must be responsible for handling the error—for example, by correcting the problem, trying an alternative approach, or informing the user of the failure. 当错误抛出后，这段代码必须来处理这个错误。例如：通过纠正问题，尝试其他方式实现，或通知用户的失败。
There are four ways to handle errors in Swift. You can propagate the error from a function to the code that calls that function, handle the error using a do-catch statement, handle the error as an optional value, or assert that the error will not occur. Each approach is described in a section below. 在swift中有四种处理错误机制: 1. 向调用方法中传递这个错误 2. 使用do-catch语句处理 3. 把错误设置为可选型 4.断言不会出现异常的情况下，使用try!禁止异常抛出
When a function throws an error, it changes the flow of your program, so it’s important that you can quickly identify places in your code that can throw errors. To identify these places in your code, write the try keyword—or the try? or try! variation—before a piece of code that calls a function, method, or initializer that can throw an error. These keywords are described in the sections below.
当一个方法抛出错误时，会打断程序正常的工作流，必须快速定位到可能抛出错误的代码。可以使用关键字try 要注意 try?或try!之间的差异。在调用一个函数，方法或者构造器之前，来抛出异常。
To indicate that a function, method, or initializer can throw an error, you write the throws keyword in the function’s declaration after its parameters. A function marked with throws is called a throwing function. If the function specifies a return type, you write the throwskeyword before the return arrow (->).
函数，方法或构造器都可以抛出异常，只需要在声明它们时添加关键字：throws即可，这种方法被称为throws函数，throws关键字位置在参数之后，返回值(->)之前
A throwing function propagates errors that are thrown inside of it to the scope from which it’s called. 抛出函数会把错误抛给调用它的函数周期中去。
为生产和开发target配置预处理宏/编译器标识。之后我们就可以使用该标识在我们的代码来检测应用程序正在运行的版本。
