blocks|key|2741291|text|sudo+xcode-select+-switch+/Applications/Xcode.app/Contents/Developer|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2741292|然后，您可以执行以下操作之一：|unstyled|2741293|xcrun+swift+
lldb+--repl|2741294|从Xcode6.1开始，在终端中输入swift也会启动REPL。|offset|length|style|CODE|2741295|entityMap^0|0|0|0|I|5|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|T|8|@$K|U|L|V|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|F|7|W|8|@]|9|@]|A|$]]]|P|$]]

<pre><code>sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer
</code></pre>

then you can do one of these: 

<pre><code>xcrun swift 
lldb --repl
</code></pre>

As of Xcode 6.1 - typing <code>swift</code> in the terminal launches the REPL as well.

blocks|key|155972|text|或者，如果你不想弄乱你当前的开发环境，你可以直接运行：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|155973|/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift|code-block|syntax|javascript|155974|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Alternatively, if you don't want to mess up your current dev environment, you can just run:

<pre><code>/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift
</code></pre>

blocks|key|2954141|text|**从xcode6测试版4开始更新**|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2954142|这也可以在xcode首选项上完成。只需转到xcode+->首选项->位置即可。|2954143|对于命令行工具，只需从下拉列表选项中选择您想要的版本，请参阅下图。(swift要求path为xcode6的path)。|2954144|​|2954145|📷|atomic|offset|length|2954146|2954147|我也会在下面留下我之前的答案。|2954148|2954149|Kaan说的话，你也可以使用一个苹果脚本来制作简单的应用程序，这样你就可以用它来回切换。|2954150|打开苹果脚本，将其粘贴到代码下面，并将其导出为应用程序，这样只需单击一下，您就可以切换到默认路径或beta路径(使用swift)|2954151|set+xcode6Path+to+"xcode-select+-switch+/Applications/Xcode6-Beta.app/Contents/Developer"
set+xcodeDefaultPath+to+"xcode-select+-switch+/Applications/Xcode.app/Contents/Developer"

display+dialog+"set+xcode+sdk+path+to+"+buttons+{"xcode+6",+"default"}+default+button+1
copy+result+as+list+to+{buttonPressed}
if+buttonPressed+is+"default"+then
++++try
++++++++do+shell+script+xcodeDefaultPath+with+administrator+privileges
++++end+try
else
++++try
++++++++do+shell+script+xcode6Path+with+administrator+privileges
++++end+try
end+if|code-block|syntax|javascript|2954152|然后运行>+xcrun+swift|style|CODE|2954153|免责声明|BOLD|2954154|2954155|脚本假设您同时安装了xcode6-beta和xcode5。|ordered-list-item|2954156|如果你是一个尝试only+xcode6beta的新开发人员，你不需要任何脚本或手动设置路径。只需运行xcrun+swift，因为已经为您设置了路径。|2954157|当xcode6最终发布时，您需要将路径从这个简单的应用程序重置回default，并且再也不使用它。|2954158|2954159|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/e8782a5373e2a8f91ab4a1279b5216df.png|imageAlt^0|0|0|0|0|0|1|0|0|0|0|0|0|0|0|6|B|0|0|4|0|0|0|8|4|1E|B|0|W|7|0|0^^$0|@$1|2|3|4|5|6|7|1O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|1R|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|1S|8|@]|9|@$K|1T|L|1U|1|1V]]|A|$]]|$1|M|3|G|5|6|7|1W|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1X|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|20|8|@]|9|@]|A|$]]|$1|U|3|V|5|W|7|21|8|@]|9|@]|A|$X|Y]]|$1|Z|3|10|5|6|7|22|8|@$K|23|L|24|11|12]]|9|@]|A|$]]|$1|13|3|14|5|6|7|25|8|@$K|26|L|27|11|15]]|9|@]|A|$]]|$1|16|3|-4|5|6|7|28|8|@]|9|@]|A|$]]|$1|17|3|18|5|19|7|29|8|@]|9|@]|A|$]]|$1|1A|3|1B|5|19|7|2A|8|@$K|2B|L|2C|11|15]|$K|2D|L|2E|11|12]]|9|@]|A|$]]|$1|1C|3|1D|5|19|7|2F|8|@$K|2G|L|2H|11|15]]|9|@]|A|$]]|$1|1E|3|-4|5|6|7|2I|8|@]|9|@]|A|$]]|$1|1F|3|-4|5|6|7|2J|8|@]|9|@]|A|$]]]|1G|$1H|$5|1I|1J|1K|A|$1L|1M|1N|-4]]]]

** update as of xcode6 beta 4 **

this can also be done on xcode preferences. simply go to xcode -> preferences -> locations. 

for command line tools simply select the version you want from drop down list options, refer picture below. (swift requires path to be xcode6's path). 

<img src="https://i.stack.imgur.com/PaeBr.png" alt="command line tools screen">

I will leave my previous answer below as well. 

<hr>

what Kaan said and you can also use an apple script to make simple application so you can use it to switch back and forth.

open apple script > paste this below code &amp; export it as an application so with just one click you can switch to default path or beta path (to use swift)

<pre><code>set xcode6Path to "xcode-select -switch /Applications/Xcode6-Beta.app/Contents/Developer"
set xcodeDefaultPath to "xcode-select -switch /Applications/Xcode.app/Contents/Developer"

display dialog "set xcode sdk path to " buttons {"xcode 6", "default"} default button 1
copy result as list to {buttonPressed}
if buttonPressed is "default" then
 try
 do shell script xcodeDefaultPath with administrator privileges
 end try
else
 try
 do shell script xcode6Path with administrator privileges
 end try
end if
</code></pre>

then run > <code>xcrun swift</code> 

disclaimer

<ol>
<li>the script assumes you have both xcode6-beta &amp; xcode5 installed. </li>
<li>if you're a new developer who's trying out only xcode6beta you will not need any script or setting path manually. simply run <code>xcrun swift</code> as the path is already set for you. </li>
<li>when xcode6 is finally released you will need to reset your path back to default from this simple app and never use it again. </li>
</ol>

blocks|key|154728|text|与从终端运行Swift的方式相同，您也可以执行脚本。只需使用下面的shebang命令，然后运行您的脚本。(Swift的创建者As+per+Chris+Lattner)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|154729|#!/usr/bin/env+xcrun+swift+-i|code-block|syntax|javascript|154730|entityMap|0|LINK|mutability|MUTABLE|url|https://twitter.com/clattner_llvm/status/474593140511211520^0|1Q|K|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

In the same fashion as running Swift from the Terminal, you can also execute scripts.
Just use the following shebang, and run your script. (<a href="https://twitter.com/clattner_llvm/status/474593140511211520">As per Chris Lattner</a>, creator of Swift)

<pre><code>#!/usr/bin/env xcrun swift -i
</code></pre>

blocks|key|156039|text|xcrun命令将使用DEVELOPER_DIR环境变量覆盖当前选择的Xcode安装(使用xcode-select设置)。您可以使用它来构造一个命令，该命令将在命令行上运行swift并将您放入REPL中。它看起来像这样：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|156040|/usr/bin/env+DEVELOPER_DIR=/Applications/Xcode6-Beta.app/Contents/Developer+xcrun+swift+|code-block|syntax|javascript|156041|你可以将其命名为“swift”：|156042|alias+swift="/usr/bin/env+DEVELOPER_DIR=/Applications/Xcode6-Beta.app/Contents/Developer+xcrun+swift"|156043|有趣的是，您可以使用相同类型的调用来运行swift脚本，就像使用bash或python一样，只需添加一个-i：|156044|#!/usr/bin/env+DEVELOPER_DIR=/Applications/Xcode6-Beta.app/Contents/Developer+xcrun+swift+-i

println("Hello+World!")|156045|当然，一旦Xcode6正式发布，并且您切换到它作为默认的开发工具，您就可以放弃DEVELOPER_DIR=。比特，只需使用"xcrun+swift“。|156046|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

The xcrun command will use the DEVELOPER_DIR environment variable to override the currently selected Xcode installation (as set with xcode-select). You can use that to construct a single command that'll run swift on the command line and put you in the REPL. That looks like this:

<pre><code>/usr/bin/env DEVELOPER_DIR=/Applications/Xcode6-Beta.app/Contents/Developer xcrun swift 
</code></pre>

and you can alias that to just 'swift':

<pre><code>alias swift="/usr/bin/env DEVELOPER_DIR=/Applications/Xcode6-Beta.app/Contents/Developer xcrun swift"
</code></pre>

As an interesting side note, you can use the same kind of invocation to run a swift script just like you'd use bash or python by adding a -i:

<pre><code>#!/usr/bin/env DEVELOPER_DIR=/Applications/Xcode6-Beta.app/Contents/Developer xcrun swift -i

println("Hello World!")
</code></pre>

Of course, once Xcode 6 is released officially and you switch to that as your default developer tools, you can drop the DEVELOPER_DIR=.. bits and just use "xcrun swift".

blocks|key|154741|text|步骤1:打开终端|type|unstyled|depth|inlineStyleRanges|entityRanges|data|154742|第二步:输入"swift“|154743|第三步:没有第三步|154744|示例：|154745|GoldCoast:~+macmark$+swift
Welcome+to+Swift!++Type+:help+for+assistance.
++1>+println("Hello,+world")
Hello,+world
++2>+var+myVariable+=+42
myVariable:+Int+=+42
++3>+myVariable+=+50
++4>+let+myConstant+=+42
myConstant:+Int+=+42
++5>+println(myVariable)
50
++6>+let+label+=+"The+width+is+"
label:+String+=+"The+width+is+"
++7>+let+width+=+94
width:+Int+=+94
++8>+let+widthLabel+=+label+%2B+String(width)
widthLabel:+String+=+"The+width+is+94"
++9>+:exit

GoldCoast:~+macmark$+|code-block|syntax|javascript|154746|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|R|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Step 1: Open Terminal 
Step 2: Type "swift" 
Step 3: There's no step 3 

Example:

<pre><code>GoldCoast:~ macmark$ swift
Welcome to Swift! Type :help for assistance.
 1&gt; println("Hello, world")
Hello, world
 2&gt; var myVariable = 42
myVariable: Int = 42
 3&gt; myVariable = 50
 4&gt; let myConstant = 42
myConstant: Int = 42
 5&gt; println(myVariable)
50
 6&gt; let label = "The width is "
label: String = "The width is "
 7&gt; let width = 94
width: Int = 94
 8&gt; let widthLabel = label + String(width)
widthLabel: String = "The width is 94"
 9&gt; :exit

GoldCoast:~ macmark$ 
</code></pre>

blocks|key|2741497|text|打开终端，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2741498|$sudo+xcode-select+-switch+/Applications/Xcode6-Beta6.app/Contents/Developer|offset|length|style|CODE|2741499|注意事项：应将Xcode6-Beta6.app替换为您安装的相应版本|BOLD|2741500|然后将此行alias+swift='xcrun+swift'放到~/.bash_profile|2741501|和,|2741502|$source+~/.bash_profile|2741503|$swift|2741504|就是这样！|2741505|entityMap^0|0|1|23|0|0|5|7|G|0|5|P|W|F|0|0|1|M|0|1|5|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|10|8|@$D|11|E|12|F|J]|$D|13|E|14|F|G]]|9|@]|A|$]]|$1|K|3|L|5|6|7|15|8|@$D|16|E|17|F|G]|$D|18|E|19|F|G]]|9|@]|A|$]]|$1|M|3|N|5|6|7|1A|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1B|8|@$D|1C|E|1D|F|G]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1E|8|@$D|1F|E|1G|F|G]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1H|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|V|$]]

open Terminal,

$<code>sudo xcode-select -switch /Applications/Xcode6-Beta6.app/Contents/Developer</code>

Notice: The <code>Xcode6-Beta6.app</code> should be replaced to appropriate version you installed

Then put this line <code>alias swift='xcrun swift'</code> to <code>~/.bash_profile</code>

And,

$<code>source ~/.bash_profile</code>

$<code>swift</code>

There you go!

blocks|key|154803|text|对于XCode6，请运行以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|154804|$+sudo+xcode-select+-s+/Applications/Xcode.app/Contents/Developer/

$+xcrun+swift|code-block|syntax|javascript|154805|如果你得到一个错误：|154806|<unknown>:0:+error:+the+SDK+'MacOSX10.9.sdk'+does+not+support+Swift|154807|尝试：|154808|xcrun+swift+-sdk+/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk|154809|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

For XCode6, run these commands:

<pre><code>$ sudo xcode-select -s /Applications/Xcode.app/Contents/Developer/

$ xcrun swift
</code></pre>

If you get an error:

<pre><code>&lt;unknown&gt;:0: error: the SDK 'MacOSX10.9.sdk' does not support Swift
</code></pre>

try:

<pre><code>xcrun swift -sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk
</code></pre>

blocks|key|156116|text|请确保安装了xcode+6.0，但未安装6.1|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|156117|如果你得到一个错误：|156118|<unknown>:0:+error:+the+SDK+'MacOSX10.9.sdk'+does+not+support+Swift|code-block|syntax|javascript|156119|快跑吧|156120|xcrun+--sdk+iphonesimulator8.0+swift|156121|或者你也可以|156122|export+SDKROOT="iphonesimulator8.0"+|156123|然后|156124|xcrun+swift|156125|使用"xcodebuild+-showsdks“可以列出可用的SDK名称。|CODE|156126|如果安装Xcode6.1，只需|156127|sudo+xcode-select+-s+/Applications/*your-Xcode-6.1-path.app*/Contents/Developer
xcrun+swift|156128|entityMap^0|6|9|K|3|0|0|0|0|0|0|0|0|0|3|K|0|4|8|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1C|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1D|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1E|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|1F|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1G|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|1H|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|6|7|1I|8|@]|D|@]|E|$]]|$1|W|3|X|5|J|7|1J|8|@]|D|@]|E|$K|L]]|$1|Y|3|Z|5|6|7|1K|8|@$9|1L|A|1M|B|10]]|D|@]|E|$]]|$1|11|3|12|5|6|7|1N|8|@$9|1O|A|1P|B|C]]|D|@]|E|$]]|$1|13|3|14|5|J|7|1Q|8|@]|D|@]|E|$K|L]]|$1|15|3|-4|5|6|7|1R|8|@]|D|@]|E|$]]]|16|$]]

make sure you install xcode 6.0 ,but not 6.1

If you get an error:

<pre><code>&lt;unknown&gt;:0: error: the SDK 'MacOSX10.9.sdk' does not support Swift
</code></pre>

just run 

<pre><code>xcrun --sdk iphonesimulator8.0 swift
</code></pre>

or you can 

<pre><code>export SDKROOT="iphonesimulator8.0" 
</code></pre>

and then

<pre><code>xcrun swift
</code></pre>

Use "<code>xcodebuild -showsdks</code>" to list the available SDK names.

if you install xcode 6.1,just

<pre><code>sudo xcode-select -s /Applications/*your-Xcode-6.1-path.app*/Contents/Developer
xcrun swift
</code></pre>

blocks|key|156139|text|在安装了官方的Xcode6.1版本之后，/usr/bin/swift中有一个swift命令。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|156140|请记住，如果路径中有一个与Apple提供的Python不同的Python，swift可能会失败，并返回ImportError:+No+module+named+site。在这种情况下，请确保在调用swift之前执行export+PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/sbin。|156141|entityMap^0|K|E|12|5|0|11|5|1F|X|2Q|5|2Z|20|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|I|$]]

After installing the official Xcode 6.1 release, there is a <code>swift</code> command in <code>/usr/bin/swift</code>.

Bear in mind that if you have a Python different from the Apple-supplied Python in the path, <code>swift</code> can fail with <code>ImportError: No module named site</code>. In that case, make sure that you do <code>export PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/sbin</code> before calling <code>swift</code>.

blocks|key|156143|text|在安装了命令行工具的Xcode6.1.1中，您可以通过以下方式直接引用/usr/bin/swift来执行脚本：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|156144|#!/usr/bin/swift

let+variable:+String+=+"string"
print("Test+\(variable)")|code-block|syntax|javascript|156145|entityMap^0|Z|E|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

In Xcode 6.1.1 with Command Line Tools installed you can execute scripts by referencing directly to <code>/usr/bin/swift</code> the following way:

<pre><code>#!/usr/bin/swift

let variable: String = "string"
print("Test \(variable)")
</code></pre>

blocks|key|153511|text|如果有人关心一个简单的Swift脚本shebang：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|153512|#!/usr/bin/env+xcrun+--sdk+macosx+swift|code-block|syntax|javascript|153513|153514|如果需要特定的目标版本|153515|#!/usr/bin/env+xcrun+--sdk+macosx+swift+-target+x86_64-macosx10.11|153516|153517|如果需要特定的工具链(比如您想使用Swift+2.3，但您使用的是Xcode+8)|153518|#!/usr/bin/env+xcrun+--toolchain+com.apple.dt.toolchain.Swift_2_3+--sdk+macosx+swift+-target+x86_64-macosx10.11|153519|153520|如果您想在Xcode7.3.1中使用SWIFT2.2，让我们假设Xcode7.3.1位于/Applications/Xcode7.app|offset|length|style|CODE|153521|sudo+xcode-select+-s+/Applications/Xcode7.app/
xcrun+--sdk+macosx+swift|153522|从现在开始，默认的active+developer目录已更改，您可以使用以下命令进行检查：|153523|xcode-select+-p|153524|153525|如果你想使用Swift.org提供的快照，你不应该错过Installation+here。|153526|153527|正如我在Run+swift+script+from+Xcode+iOS+project+as+build+phase中首先回答的|153528|entityMap|0|LINK|mutability|MUTABLE|url|https://swift.org/download|1|https://swift.org/download/#using-downloads|2|https://stackoverflow.com/questions/30981724/run-swift-script-from-xcode-ios-project-as-build-phase/36248410#36248410^0|0|0|0|0|0|0|0|0|0|18|O|0|0|0|0|0|6|9|0|R|H|1|0|0|4|1I|2|0^^$0|@$1|2|3|4|5|6|7|1L|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1M|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1O|8|@]|9|@]|A|$]]|$1|J|3|K|5|D|7|1P|8|@]|9|@]|A|$E|F]]|$1|L|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1R|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|1S|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|1T|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|1U|8|@$T|1V|U|1W|V|W]]|9|@]|A|$]]|$1|X|3|Y|5|D|7|1X|8|@]|9|@]|A|$E|F]]|$1|Z|3|10|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|11|3|12|5|D|7|1Z|8|@]|9|@]|A|$E|F]]|$1|13|3|-4|5|6|7|20|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|21|8|@]|9|@$T|22|U|23|1|24]|$T|25|U|26|1|27]]|A|$]]|$1|16|3|-4|5|6|7|28|8|@]|9|@]|A|$]]|$1|17|3|18|5|6|7|29|8|@]|9|@$T|2A|U|2B|1|2C]]|A|$]]|$1|19|3|-4|5|6|7|2D|8|@]|9|@]|A|$]]]|1A|$1B|$5|1C|1D|1E|A|$1F|1G]]|1H|$5|1C|1D|1E|A|$1F|1I]]|1J|$5|1C|1D|1E|A|$1F|1K]]]]

If any one cares a simple Swift script shebang:

<pre><code>#!/usr/bin/env xcrun --sdk macosx swift
</code></pre>

<hr>

If specific target version is required

<pre><code>#!/usr/bin/env xcrun --sdk macosx swift -target x86_64-macosx10.11
</code></pre>

<hr>

If specific toolchain is required (like you want to use Swift 2.3 but you are using Xcode 8)

<pre><code>#!/usr/bin/env xcrun --toolchain com.apple.dt.toolchain.Swift_2_3 --sdk macosx swift -target x86_64-macosx10.11
</code></pre>

<hr>

If you want to use Swift 2.2 in your Xcode 7.3.1, let's assume Xcode 7.3.1 is located at <code>/Applications/Xcode7.app</code>

<pre><code>sudo xcode-select -s /Applications/Xcode7.app/
xcrun --sdk macosx swift
</code></pre>

from now on the default active developer directory changed, you can check that using:

<pre><code>xcode-select -p
</code></pre>

<hr>

If you want to use snapshots provided by <a href="https://swift.org/download" rel="nofollow noreferrer">Swift.org</a>, you should not miss <a href="https://swift.org/download/#using-downloads" rel="nofollow noreferrer">Installation here</a>.

<hr>

as first answered by me in <a href="https://stackoverflow.com/questions/30981724/run-swift-script-from-xcode-ios-project-as-build-phase/36248410#36248410">Run swift script from Xcode iOS project as build phase</a>

blocks|key|154861|text|借助Swift+REPL(Read+Eval+Print+Loop)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|154862|熟悉解释型语言的开发人员在这个命令行环境中会感到很舒服，即使是经验丰富的开发人员也会发现一些独特的特性|154863|启动Terminal.app并键入swift，然后按enter键。然后你就可以进入Swift+REPL了。|154864|++++++++1>+print("Hello+Swift+REPL")
+++++Hello+Swift+REPL
++++++++2>+10+%2B+20
+++++$R0:+Int+=+30
++++++++3>+var+name+=+"Yogendra+Singh"
+++++name:+String+=+"Yogendra+Singh"
++++++++4>+print(name)
+++++Yogendra+Singh
++++++++5>|code-block|syntax|javascript|154865|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

With the help of Swift REPL(Read Eval Print Loop).

Developers familiar with interpreted languages will feel comfortable in this command-line environment, and even experienced developers will find a few unique features

Launch Terminal.app and type swift and press enter. You’ll then be in the Swift REPL.

<pre><code> 1&gt; print("Hello Swift REPL")
 Hello Swift REPL
 2&gt; 10 + 20
 $R0: Int = 30
 3&gt; var name = "Yogendra Singh"
 name: String = "Yogendra Singh"
 4&gt; print(name)
 Yogendra Singh
 5&gt;
</code></pre>

I read <a href="https://developer.apple.com/xcode/" rel="noreferrer">What's new in Xcode 6</a>. The article introduces some new feature about Xcode 6, and it says:
<blockquote>
Command Line
Xcode’s debugger includes an interactive version of the Swift language, known as the REPL (Read-Eval-Print-Loop). Use Swift syntax to evaluate and interact with your running app or write new code in a script-like environment. The REPL is available from within LLDB in Xcode’s console, or from Terminal.
</blockquote>
I want to know how to get the REPL?

How can I use swift in Terminal?

命令行工具

调试器

Python

Swift

Xcode

我读过。本文介绍了Xcode6的一些新特性，并表示：命令行Xcode的调试器包括Swift语言的交互式版本，称为REPL (Read-Eval-Print-Loop)。使用Swift语法评估正在运行的应用程序并与之交互，或者在类似脚本的环境中编写新代码。REPL可以从Xcode控制台中的LLDB中获得，或者从终端中获得...

问如何在终端中使用swift？
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