blocks|key|1985475|text|Xcode4增加了一个新的“代码片段”特性，可以通过View+>+Utilities+>+Code+Snippet+Library访问。要添加新的代码片段，请在编辑器视图中选择一些文本并将其拖动到代码片断库中。您可以拖出一个代码段并将其放入代码中以使用它，或者更方便的是，为它分配一个完成快捷方式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1985476|当您键入该系列字母时，它将在您键入代码时自动显示在“代码完成”弹出菜单中。例如，在许多其他代码中，我设置了一个代码片段，以便输入"svk“将扩展为setValue:<#value#>+forKey:<#key#>。这可以省去在自动完成菜单中为您最常用的方法和其他代码表达式键入和/或寻找的大量工作。Xcode附带了一堆内置的代码片段，这些代码片段也非常方便。|offset|length|style|CODE|1985477|entityMap^0|0|21|X|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Xcode 4 adds a new "Code Snippets" feature, accessible via View > Utilities > Code Snippet Library. To add a new code snippet, select some text in the editor view and drag it into the snippet library. You can either drag a snippet out and drop it in your code to use it, or, much more conveniently, assign a completion shortcut to it. 

When you type in that series of letters, it will automatically show up in the code completion pop-up menu as you type your code. For example, among many others, I have a snippet set up so that typing "svk" will expand to <code>setValue:&lt;#value#&gt; forKey:&lt;#key#&gt;</code>. This can save a lot of typing and/or fishing around in the autocompletion menu for the methods and other code expressions you use the most. Xcode ships with a bunch of built-in snippets that come in very handy as well.

blocks|key|1771696|text|我最常使用的新快捷方式是:三指轻扫(向上或向下)来交换(界面和实现文件之间)的对应物。不会再用手杂技了！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1771697|感谢https://twitter.com/xctotd/status/48148271759241216|offset|length|1771698|entityMap|0|LINK|mutability|MUTABLE|url|https://twitter.com/xctotd/status/48148271759241216^0|0|2|1F|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

New shortcut I use most often: triple-finger swipe (up or down) to swap counterparts (between the interface and implementation files). No more hand acrobatics!

Thanks to <a href="https://twitter.com/xctotd/status/48148271759241216">https://twitter.com/xctotd/status/48148271759241216</a>

blocks|key|1771595|text|Xcode4中的标签非常棒。每个标签都有自己独立的布局，所以你可以有多个标签，里面有不同的东西，并且每个标签都有合适的布局。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1771596|我一直在用three+layouts—one+for+the+project+object,+one+for+each+nib+(showing+the+owner's+class's+sources),+and+one+for+each+class设置我的项目。|offset|length|1771597|这里有一个bug+:从4.0开始，当您重新打开项目时，Xcode将重置活动选项卡的状态(关闭所有助手)。解决方法是切换到没有助手的选项卡，以便在关闭项目之前关闭Xcode。我已经把这个作为9178441号雷达提交了。|1771598|entityMap|0|LINK|mutability|MUTABLE|url|http://imgur.com/a/LB3Wm^0|0|5|3C|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

Tabs in Xcode 4 are awesome. Each one maintains its own separate layout, so you can have multiple tabs with different things in them and have each one lain out appropriately.

I've been setting up my projects with <a href="http://imgur.com/a/LB3Wm">three layouts—one for the project object, one for each nib (showing the owner's class's sources), and one for each class</a>.

There is one bug here: As of 4.0, Xcode will reset the state (turning off any Assistants) of the active tab when you reopen the project. The workaround is to switch to a tab with no Assistants for Xcode to close before you close the project. I have filed this as Radar number 9178441.

blocks|key|1984824|text|这是第一个。Tabs！Xcode4已经用持久标签取代了Xcode3有用但很少使用的“收藏夹栏”。这意味着您可以在选项卡栏中保留常用文档的工作集。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1984825|这并不完全是一个隐藏的特征--但标签是持久的这一事实可能很容易被忽略。|1984826|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Here's the first. Tabs! Xcode 4 has replaced Xcode 3's useful but rarely used "favorites bar" with persistent tabs. This means you can keep a working set of commonly used documents in your tab bar.

Not exactly a hidden feature as such - but the fact that the tabs are persistent is perhaps easily missed.

blocks|key|1771506|text|如果您在项目索引方面遇到任何问题(例如，符号未显示在自动完成中)，请打开管理器窗口，单击项目选项卡，然后使用“删除”按钮删除项目的派生数据。这将强制重建项目的索引，并丢弃所有已构建的产品。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1771507|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you're having any sort of trouble with the indexing of your project (e.g. symbols not showing up in autocompletion), open the Organizer window, click the Projects tab, and use the "Delete" button to delete the derived data for your project. This will force a rebuild of the project's index, as well as tossing out any built products.

blocks|key|1985625|text|现在，可以将项目导航器中的组与磁盘上的文件夹相关联。在此之前，Xcode3文件视图可能并不代表磁盘上项目的实际结构，这一直困扰着我。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1985626|创建一个新组，然后在新组高亮显示的情况下，打开文件检查器。在右侧的identity部分中，'Path‘的正下方是一个小图标，单击此图标可打开文件浏览器对话框，您可以在其中选择该组的目录。|1985627|​|1985628|📷|atomic|offset|length|1985629|1985630|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/1a62b35106f88205d06c013c06b5a709.png|imageAlt^0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@$I|Y|J|Z|1|10]]|A|$]]|$1|K|3|E|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S|T|-4]]]]

You can now associate groups in the Project Navigator with folders on disk. It always bugged me before that the Xcode 3 file view may not represent the actual structure of the project on disk.

Create a new group, then with the new group highlighted, open the File Inspector. In the identity section on the right just below the 'Path' is a small icon, click this to open the file browser dialog allowing you to select the directory for this group.

<img src="https://i.stack.imgur.com/1UEPk.png" alt="File Inspector">

blocks|key|1985935|text|如果按住FN键，则可以使用光标在文档中进行扫描，而无需移动光标|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1985936|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you hold the FN key then you can scan through your document with the cursorkeys, without moving the cursor

blocks|key|1772212|text|我最喜欢的是“打开选项卡”行为首选项。如果你进入偏好设置中的“行为”，你可以将其设置为在运行开始时转到特定的选项卡。你可以将标签命名为"Debug“，如果它不存在，Xcode4会为你创建它，当你开始调试时，它会带你到那里。您可以根据需要配置此选项卡以用于调试会话，并且在您关闭它后，它将保持原样，因此无论何时执行run+Xcode4，都会在单独的选项卡中按您所需的方式进行设置。您甚至可以将此选项卡拆下到一个单独的窗口，在这种情况下，Xcode4将在您每次开始运行时打开一个新的特殊配置的“调试”窗口！这个特性很棒，因为它可以让您的常规代码编辑选项卡或窗口与日志和调试器窗格保持整洁。运行完毕后，只需关闭"Debug“窗口，即可返回到干净的代码屏幕。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1772213|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

One of my favorites is the "Open Tab" behavior preference. If you go to "Behaviors" in Preferences, you can set it to go to a specific tab whenever a run starts. You can name the tab, something like "Debug" and Xcode4 will create it for you if it doesn't exist, and take you there when you start debugging. You can configure this tab just how you like it for debugging sessions, and it will stick that way after you close it, so whenever you do a run Xcode4 will be set up just how you want it, in a separate tab. You can even tear this tab off to a separate window, in which case Xcode4 will open a new specially configured "Debug" window each time you start a run! This feature is great because it keeps your regular code editing tab or window uncluttered with the log and debugger panes. Simply close the "Debug" window when you're done running and you can be back to your clean screen of code.

blocks|key|1985962|text|在XCode3中，有一个“重命名项目”的选项。现在，您只需单击两次(第二次缓慢单击)即可重命名项目&完成。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1985963|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In XCode3, There was an option for "Rename the Project". Now, you just need to click twice ( second click slowly ) to rename the project &amp; Its done.

blocks|key|1772126|text|如果您更喜欢使用在终端或任何其他外部编辑器上运行的vim/emacs，则只需创建xcode项目，添加文件等内容，然后使用最适合您的编辑方式切换到编辑上述文件；每当您将焦点切换到xcode4窗口时，修改后的文件都会被重新加载(+Xcode3也是如此)，您可以构建/运行应用程序。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1772127|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you prefer using vim/emacs running on, say, Terminal, or any other external editor, you can just create your xcode project, add files and whatnot and then switch to editing said files using whichever edit suits you best; whenever you switch focus to an xcode4 window, the modified files will be reloaded( was also the case with Xcode3 ) and you can build / run your application.

Now that Xcode 4 is officially released it's time for a follow up to my previous question: <a href="https://stackoverflow.com/questions/146297/hidden-features-of-xcode">Hidden Features of Xcode</a>

So what are they? What are those hidden little Xcode 4 hints &amp; tips that you can't live without?

Please limit your tips to those that are new and specific to Xcode 4!

Hidden Features of Xcode 4

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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现在Xcode4正式发布了，是时候继续我之前的问题了：那么它们是什么呢？这些隐藏的Xcode 4提示和提示是什么，你离不开它们？请将您的技巧限制在那些新的和特定于Xcode4的技巧！

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