blocks|key|2735613|text|诀窍是，选择正确的命令行工具！只需在此处选择它|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2735614|📷|atomic|offset|length|2735615|​|2735616|重新启动(！)一切又好起来了:-)|style|BOLD|2735617|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/db973975ba8ebc0a97ce0f0eef365771.png|imageAlt^0|0|0|1|0|0|0|0|4|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|W|8|@]|9|@$E|X|F|Y|1|Z]]|A|$]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|11|8|@$E|12|F|13|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T|U|-4]]]]

the trick is, to select the right command line tools!
just select it here
<img src="https://i.stack.imgur.com/0Cw8p.png" alt="enter image description here" />
reboot(!) and everything is fine again :-)

blocks|key|154330|text|好的，这是已知的问题。你看到模拟器列表了吗？如果不是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|154331|转到Xcode菜单->+Open+Developer+Tool+->，它将在您的Dock+->中打开一个模拟器，单击模拟器，然后进入模拟器菜单:+Hardware+->+Device+->+Manage+Devices。添加所需的模拟器。总是尝试使用不同的simulators.someone来运行你的应用程序。|154332|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|$]]

Ok It's known problem. Do you see simulators list? If not

Goto Xcode Menu -> Open Developer Tool -> It will open a simulator in your Dock -> click on simulator then go to Simulator Menu: Hardware -> Device -> Manage Devices. Add needed simulators. Always try to run your app with different simulators.someone will work.

blocks|key|2948593|text|重新启动您的Mac。在安装了Xcode6beta7之后，我就遇到了同样的错误，我唯一的反应就是重启了我的iOS，现在Xcode8模拟器可以工作了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2948594|如果您更新Xcode而不重新启动，则此错误很常见。|2948595|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|$]]

Restart your Mac. I just had that exact error after installing Xcode 6 beta 7, literally the only thing I did in response was reboot my Mac and now the iOS 8 simulator is working.

This error is common if you update Xcode without restarting afterwards.

blocks|key|151673|text|在我的例子中，我重置了ios模拟器设置来修复它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|151674|iOS模拟器->重置内容和设置...|151675|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|$]]

In my case, i reset ios simulator settings fix it.

iOS Simulator -> Reset Content and Settings ...

blocks|key|150603|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|150604|打开Xcode+6测试版|ordered-list-item|150605|转到窗口>设备|150606|单击底部的小%2B号|150607|添加(如果缺少)所有需要的设备，或者删除并重新创建(如果设备不起作用)。|150608|如果有任何模拟器不工作，您可以将其删除，然后在此菜单中重新创建。|150609|150610|​|150611|📷|atomic|offset|length|150612|150613|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/aa07d2a5d291cc31cdbb12a03c8fedbb.png|imageAlt^0|0|0|0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|-4|4|5|6|13|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|14|7|@]|8|@]|9|$]]|$1|D|3|E|4|C|6|15|7|@]|8|@]|9|$]]|$1|F|3|G|4|C|6|16|7|@]|8|@]|9|$]]|$1|H|3|I|4|C|6|17|7|@]|8|@]|9|$]]|$1|J|3|K|4|C|6|18|7|@]|8|@]|9|$]]|$1|L|3|-4|4|5|6|19|7|@]|8|@]|9|$]]|$1|M|3|N|4|5|6|1A|7|@]|8|@]|9|$]]|$1|O|3|P|4|Q|6|1B|7|@]|8|@$R|1C|S|1D|1|1E]]|9|$]]|$1|T|3|N|4|5|6|1F|7|@]|8|@]|9|$]]|$1|U|3|-4|4|5|6|1G|7|@]|8|@]|9|$]]]|V|$W|$4|X|Y|Z|9|$10|11|12|-4]]]]

<ol>
<li>Open Xcode 6 beta</li>
<li>Goto Window > Devices</li>
<li>Click on the little + sign at the bottom</li>
<li>Add (if missing) all the devices that you want, or delete and recreate if not working.</li>
<li>If anyone of the simulator is not working then you can delete it and then re-create it again in this menu.</li>
</ol>

<img src="https://i.stack.imgur.com/I3pxy.png" alt="enter image description here">

blocks|key|154358|text|当我安装Xcode6测试版6，并删除测试版4和测试版5时，我看到了同样的问题。显然，删除旧的测试版也会删除iOS模拟器8版本！把它从我的垃圾桶里放回去就解决了问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|154359|解决方案:不要删除旧的测试版软件！|154360|编辑：@Flori的解决方案起作用了。能够删除旧的测试版软件，在系统完全重启后，它又可以工作了。|154361|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I saw the same issue when I installed Xcode 6 beta 6, and deleted beta 4 and beta 5. Apparently, deleting the old betas also deleted the iOS Simulator 8 versions! Putting it back from my Trash solved the issue.

Solution: Don't delete old beta software!

Edit: @Flori's solution worked. Was able to delete the old beta software, and after a complete system reboot, it worked again.

blocks|key|153189|text|从|type|unstyled|depth|inlineStyleRanges|entityRanges|data|153190|6下拉菜单中，选择xCode+>+Open+Developer+Tool+>+Xcode+iOS+(如果出现弹出错误，请忽略它)|unordered-list-item|153191|
|153192|进入模拟器后，转到Hardware+>+Device+>+Manage+Devices.|153193|153194|Delete+simulator.|153195|153196|Reboot+|153197|下列出的所有内容。|153198|153199|153200|之后，在模拟器中导航回Manage+Devices，然后单击加号添加回模拟器。然后iOS+8模拟器就会出现。|153201|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|Y|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|Z|8|@]|9|@]|A|$]]|$1|I|3|F|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|D|7|11|8|@]|9|@]|A|$]]|$1|L|3|F|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|14|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|17|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|V|$]]

<ul>
<li>From the xCode 6 pull down menus, Xcode > Open Developer Tool >
iOS Simulator (if you get a pop up error just dismiss it)</li>
<li>Once in the Simulator go to Hardware > Device > Manage Devices.</li>
<li>Delete everything listed under simulator.</li>
<li>Reboot your machine.</li>
</ul>

After that, navigate back to Manage Devices in the simulator and click the plus to add back your simulators. Then the iOS 8 simulators will show up.

blocks|key|2736046|text|只需在/etc/launchd.conf或~/.launchd.conf文件中取消设置DYLD_INSERT_LIBRARIES环境变量即可。您可以使用sudo+vi+/etc/launchd.conf命令对其进行编辑。删除上面的标志，用"ZZ“(captial+Z)保存它，然后重新启动系统。它就像一种护身符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2736047|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|$]]

Just unset DYLD_INSERT_LIBRARIES environment variable in the /etc/launchd.conf or ~/.launchd.conf file. Which you can edit by sudo vi /etc/launchd.conf command. remove the above flag save it by "ZZ" (captial Z) and reboot the system. It works like a charm.

blocks|key|154446|text|确保菜单XCode>Preference>Locations中的路径指向Xcode6.0(更改后重新启动XCode+)。然后转到menu+Window>Devices+(菜单设置)并添加要使用的模拟器设备。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|154447|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|$]]

Make sure that path in menu XCode>Preference>Locations point to XCode 6.0 (Restart Xcode after changing them). Then go to menu Window>Devices and add simulator devices you want to use.

blocks|key|151708|text|我在从Beta+6迁移到Beta+7的时候遇到了这个问题，非常令人沮丧。我可以在任何iOS+8模拟器上重置内容和设置。我的iOS+8模拟器都不能工作，只有黑屏。我在这个过程中重新启动了我的机器，但我不确定它是否起了什么作用。最初我只有iOS+8模拟器。我不得不删除并重新安装Xcode6Beta7。我第一次安装的时候没有安装更多的组件，我不确定这是不是缺少的部分。我从“设置”->“下载”安装了iOS+7模拟器，因为我的iOS8模拟器无法工作。在我重新安装并重新启动模拟器之后，我就有了一个iOS+6、7和8模拟器列表。所有iOS+8模拟器都不工作。我能够启动iOS7模拟器，然后使用设备菜单切换到iOS+8模拟器。有些仍然不起作用，我不得不移除它们，并在设备屏幕中重新添加它们。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|151709|151710|从Applications.|ordered-list-item|151711|Restart计算机中删除XCode6Beta+(以防万一，这似乎解决了运行安装附加组件的某些人的问题。Xcode.|offset|length|style|CODE|151712|Preferences->Downloads->Download模拟器将Xcode6Beta.|151713|Preferences->General->Change命令行工具启动到Xcode6.0.|151714|重新启动iOS+7模拟器(如果尚未启动iOS+7模拟器上的iOS应用程序(或启动iOS模拟器并切换到iOS+7设备)|151715|如果iOS+7模拟器正在工作，硬件->设备->从Xcode.|151716|选择一个iOS+8+simulator.|151717|Delete并在窗口->设备中重新创建任何不工作的iOS+8模拟器|unordered-list-item|151718|151719|entityMap^0|0|0|0|D|A|1G|5|0|0|0|0|O|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|12|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|13|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|14|8|@$H|15|I|16|J|K]|$H|17|I|18|J|K]]|9|@]|A|$]]|$1|L|3|M|5|E|7|19|8|@]|9|@]|A|$]]|$1|N|3|O|5|E|7|1A|8|@]|9|@]|A|$]]|$1|P|3|Q|5|E|7|1B|8|@]|9|@]|A|$]]|$1|R|3|S|5|E|7|1C|8|@$H|1D|I|1E|J|K]]|9|@]|A|$]]|$1|T|3|U|5|6|7|1F|8|@]|9|@]|A|$]]|$1|V|3|W|5|X|7|1G|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|10|$]]

I got this issue when moving from Beta 6 to Beta 7. Very frustrating. I could reset content and settings on any of the iOS 8 simulators. None of my iOS 8 simulators were working at all, just a black screen. I restarted my machine during the process, but I am not sure if it did anything. Initially I had only iOS 8 Simulators. I had to remove and reinstall Xcode6Beta7. I did not get the Install More Components the first time I installed it, I am not sure if that was the missing part. I installed the iOS 7 Simulators from Settings->Downloads because my iOS8 ones were not working. After I had reinstalled and relaunched the simulator, I then had a list of iOS 6,7,&amp; 8 simulators. None of the iOS 8 Simulators were working. I was able to launch the iOS7 simulator and then using the device menu change to an iOS 8 Simulator. Some still did not work, I had to remove them and re-add them in the devices screen.

<ol>
<li>Remove <code>XCode6Beta</code> from Applications.</li>
<li>Restart Machine (Just in case, this seems to solve some peoples issue completely)</li>
<li>Install <code>XCode6Beta</code>.</li>
<li>Verify the Install Additional Components ran.</li>
<li>Launch Xcode6Beta.</li>
<li>Preferences->General->Change Command Line Tools to Xcode 6.0.</li>
<li>Restart <code>Xcode</code>.</li>
<li>Preferences->Downloads->Download iOS 7 Simulator (If not already downloaded).</li>
<li>Run App on iOS 7 Simulator (Or launch iOS Simulator and switch to iOS 7 device)</li>
<li>If the iOS 7 Simulator is working, Hardware->Devices->Select an iOS 8 simulator.</li>
<li>Delete and recreate any non working iOS 8 Simulators in Window->Devices from <code>Xcode</code>.</li>
</ol>

blocks|key|154527|text|编辑：发现我得到了我的错误版本，因为我在几个项目中有一个名为"Frameworks“的文件(”空文件“类型)，这导致了iOS+8模拟器的大问题。将文件重命名为其他名称，然后执行Clean+Build文件夹立即修复它。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|154528|-下面已弃用的原始邮件|154529|如果这对任何人都有帮助--我在Xcode6+GM上遇到了类似的错误，并尝试了这些答案中提到的所有方法，但iOS+8模拟器永远不会运行我的任何应用程序(尽管在Xcode6上运行iOS+7没有问题)。|154530|所做的工作是创建一个新的项目(新的项目应用程序将在iOS+8模拟器中运行，但不会在现有应用程序上运行)。复制文件和项目设置并不好玩，但至少它让我做了测试，看看我的应用程序是否需要为iOS+8公开版本进行修复。|154531|https://devforums.apple.com/thread/246751问题的扩展描述|154532|entityMap|0|LINK|mutability|MUTABLE|url|https://devforums.apple.com/thread/246751^0|0|3|0|0|0|0|0|15|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|Z|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|10|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|11|8|@]|D|@$9|12|A|13|1|14]]|E|$]]|$1|N|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U]]]]

Edit: Turns out I was getting my version of the error because I had a file (the "Empty File" type) named "Frameworks" in several of my projects, and this was causing big issues with the iOS 8 simulators. Renaming the file to be anything else, and then doing a Clean Build Folder fixed it right away.

------Deprecated Original Message Below--------

In case this helps anyone -- I was having a similar error on Xcode 6 GM, and tried everything mentioned in these Answers, but the iOS 8 simulators would never run any of my apps (no problems with iOS 7 running from Xcode 6 though).

What did sort of work was creating a new project (new project apps would run in the iOS 8 simulators, but never any luck with existing apps). Copying over files and project settings is no fun, but at least it let me do testing and see if my apps needed fixing for the iOS 8 public release.

Extended description of problem at <a href="https://devforums.apple.com/thread/246751" rel="nofollow">https://devforums.apple.com/thread/246751</a>

blocks|key|154542|text|我尝试了上面提到的所有方法，但都不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|154543|最后，使其正常工作的唯一方法是取消设置DYLD_INSERT_LIBRARIES=/usr/lib/libimckit.dylib|offset|length|style|BOLD|154544|我是如何做到的：|154545|154546|打开终端并键入"sudo+vi+/etc/launchd.conf"|ordered-list-item|154547|Changing|154548|154549|"setenv+DYLD_INSERT_LIBRARIES+/usr/lib/libimckit.dylib"|154550|至|154551|"unsetenv+DYLD_INSERT_LIBRARIES+/usr/lib/libimckit.dylib"|154552|保存您的系统changes|154553|Reboot+|unordered-list-item|154554|154555|154556|154557|在这篇文章中，1解释了DYLD_INSERT_LIBRARIES的用途|154558|1|154559|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/26053165/2091181^0|0|J|L|0|0|0|0|0|0|0|1J|0|0|0|1L|0|0|0|0|0|0|0|0|1|0|0^^$0|@$1|2|3|4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1H|8|@$D|1I|E|1J|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1K|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|1M|8|@]|9|@]|A|$]]|$1|N|3|O|5|M|7|1N|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1P|8|@$D|1Q|E|1R|F|G]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1S|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1T|8|@$D|1U|E|1V|F|G]]|9|@]|A|$]]|$1|W|3|X|5|6|7|1W|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|10|7|1X|8|@]|9|@]|A|$]]|$1|11|3|-4|5|M|7|1Y|8|@]|9|@]|A|$]]|$1|12|3|-4|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|13|3|-4|5|6|7|20|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|21|8|@]|9|@]|A|$]]|$1|16|3|17|5|6|7|22|8|@]|9|@$D|23|E|24|1|25]]|A|$]]|$1|18|3|-4|5|6|7|26|8|@]|9|@]|A|$]]]|19|$1A|$5|1B|1C|1D|A|$1E|1F]]]]

I tried everything mentioned above and nothing worked.

Finally the only way to make it work was unsetting DYLD_INSERT_LIBRARIES=/usr/lib/libimckit.dylib

How I did this:

<ol>
<li>Open terminal and typing "sudo vi /etc/launchd.conf"</li>
<li>Changing</li>
</ol>

"setenv DYLD_INSERT_LIBRARIES /usr/lib/libimckit.dylib"

to

"unsetenv DYLD_INSERT_LIBRARIES /usr/lib/libimckit.dylib"

<ol start="3">
<li>Save changes</li>
<li>Reboot your system</li>
</ol>

In this post [1] explain what DYLD_INSERT_LIBRARIES is for

[1] <a href="https://stackoverflow.com/a/26053165/2091181">https://stackoverflow.com/a/26053165/2091181</a>

blocks|key|151617|text|我在这个问题上挣扎了一段时间，模拟器应用程序报告它找不到iOS8模拟器，并建议在Prefs/Downloads中进行更新，但这并不起作用。我尝试了两次重新安装Beta+6(没有删除所有的支持文件，这将是下一步)。初始安装将其自身描述为build+6A280c；重新下载会生成build+6A280e。不走运。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|151618|最后，我打开Window+->设备，使用左下角的"%2B“按钮为iPhone+5s添加了一个新的模拟器iOS+8，并将其命名为"Fresh+5s”。方案弹出窗口现在显示了三个iPhone+5S/iOS+8选项(没有使用我指定的名称，但通过UUID区分)；至少其中一个有效。|151619|我猜这个特性(任意模拟器实例的集合)在它被烘焙时会非常有用。同时，我想我需要手动管理模拟器列表。|151620|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I wrestled with this for a bit, with the simulator app reporting that it couldn't find the iOS8 simulator, and suggesting updating in Prefs/Downloads, which didn't work. I tried re-installing Beta 6 twice (without removing all the support files, which would have been next). The initial installation described itself as build 6A280c; a fresh download yielded build 6A280e. No luck.

Eventually, I opened Window -> Devices, and used the "+" button in the lower left to add a new simulator for iPhone 5s, iOS 8, naming it "Fresh 5s". The Schemes popup now displayed three iPhone 5S/iOS 8 options (none with the name I designated, but differentiated by UUIDs); at least one of them worked.

I'm guessing that this feature (collections of arbitrary simulator instances) will be very useful when it's baked. In the meantime, I guess I'll need to manage the list of simulators manually.

blocks|key|2735911|text|执行以下对我有效的步骤：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2735912|1.+Launch+the+iOS+Simulator+and+go+to+iOS+Simulator+-->+Reset+Content+and+Settings...

2.+Close+all+the+applications+and+restart+your+mac+

3.+Open+Xcode6.0.1+or+6.0+and+test+the+iOS+Simulator|code-block|syntax|javascript|2735913|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|$]]

Do following steps worked for me:

<pre><code>1. Launch the iOS Simulator and go to iOS Simulator --&gt; Reset Content and Settings...

2. Close all the applications and restart your mac 

3. Open Xcode6.0.1 or 6.0 and test the iOS Simulator
</code></pre>

blocks|key|153076|text|在从Xcode6Beta5迁移到Beta6之后也有同样的问题，但对于iOS+7.1模拟器也是如此。重启我的机器似乎完成了这项工作。我不需要从Xcode+5.1.1+CLT更新到Xcode+6.0+CLT。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|153077|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|$]]

Had the same problem after moving from Xcode 6 beta 5 to beta 6, but also for the iOS 7.1 simulator. Restarting my machine seemed to do the job. I did not need to update from Xcode 5.1.1 CLT to Xcode 6.0 CLT.

blocks|key|153203|text|我尝试了上面所有的解决方案，但仍然无法启动iOS8模拟器。iOS7模拟器都运行良好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|153204|查看控制台，我发现启动正在崩溃，并且崩溃日志抱怨动态库libimckit.dylib。你可以在这里阅读到：https://discussions.apple.com/thread/5781366?start=0&tstart=0|offset|length|153205|快速解决方案删除该库及其合作伙伴库，重新启动，然后加载。|153206|entityMap|0|LINK|mutability|MUTABLE|url|https://discussions.apple.com/thread/5781366?start=0&tstart=0^0|0|1H|1P|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]]]]

I tried all of the solutions above, and was still unable to launch the iOS8 Simulator. The iOS7 Simulators all launched fine.

Looking at the Console, I found that the launch was crashing, and the crash log complained about the dynamic library, libimckit.dylib. You can read about that here:
<a href="https://discussions.apple.com/thread/5781366?start=0&amp;tstart=0" rel="nofollow">https://discussions.apple.com/thread/5781366?start=0&amp;tstart=0</a>

The quick solution, remove that and its partner library, reboot, and it loads.

blocks|key|2735946|text|~/Library/Logs/CoreSimulator/CoreSimulator.log?中有什么有趣的东西吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2735947|"Unable+to+boot+The+iOS+Simulator.“错误消息几乎总是由于DYLD_INSERT_LIBRARIES被设置为与iOS模拟器运行时不兼容而导致的launchd_crashed。在~/Library/+logs+/DiagnosticReports中是否有任何崩溃日志(例如:+launchd_sim崩溃)？如果是，请检查它们是否显示设置了DYLD_INSERT_LIBRARIES。如果是这种情况，你的选择是要么更新到OS主机(它将处理这个问题)，要么取消设置DYLD_INSERT_LIBRARIES+(可能在/etc/launchd.conf或~/.Launchd.conf中设置)|2735948|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|$]]

Is there anything interesting in ~/Library/Logs/CoreSimulator/CoreSimulator.log?

The "Unable to boot the iOS Simulator." error message is almost always because launchd_crashed because DYLD_INSERT_LIBRARIES was set to something not compatible with the iOS Simulator runtime. Do you have any crash logs (eg: launchd_sim crashes) in ~/Library/Logs/DiagnosticReports? If so, check if they show DYLD_INSERT_LIBRARIES being set. If that's the case, your options are to either update to an OS X Yosemite host (which will deal with this issue) or unset DYLD_INSERT_LIBRARIES (likely set in /etc/launchd.conf or ~/.launchd.conf)

blocks|key|153292|text|MAC强制退出所有应用程序，包括xcode和simulator|type|unstyled|depth|inlineStyleRanges|entityRanges|data|153293|Restart+|unordered-list-item|153294|ordered-list-item|153295|153296|153297|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$]]|$1|E|3|-4|5|F|7|M|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|N|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|J|$]]

<ol>
<li>Force Quit All the apps including xcode and simulator</li>
<li>Restart MAC</li>
</ol>

blocks|key|154688|text|查看"Locations“Xcode首选项，我有两个相同版本的项，一个位于应用程序移位区(/var/.../AppTranslocation/...)。另外，我之前已经手动完成了命令行工具的安装。为了最终解决这个问题，我不得不删除/Applications/Xcode.app并删除手动命令行工具install：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|154689|sudo+rm+-rf+/Library/Developer/CommandLineTools|code-block|syntax|javascript|154690|然后重新安装Xcode，并重新启动。轰隆隆！模拟器又开始工作了。|154691|entityMap^0|V|3H|0|0|0|W|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

Checking in the "Locations" Xcode preference, I had two items of the same version, one located in the app translocation area (/var/.../AppTranslocation/...). Also I had previously done a manual command line tools install. To resolve this in the end I had to delete /Applications/Xcode.app and remove the manual command line tools install:

<pre><code>sudo rm -rf /Library/Developer/CommandLineTools
</code></pre>

Then installed Xcode anew, and rebooted. Boom! Simulator working again.

blocks|key|151901|text|重启你的mac操作系统。它可以在xcode+11.3.x和mac+os+10.14.6上正常工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|151902|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|$]]

Reboot your mac os. its working correctly on xcode 11.3.x and mac os 10.14.6.

I cannot launch the simulator successfully. Once I launch the IOS Simulator this error appears:

<blockquote>
 "Unable to boot the IOS Simulator."
</blockquote>

Following the IOS Simulator error, I then get an error from Xcode reading: 

<blockquote>
 Unable to run app in Simulator 
 An error was encountered while running (Domain = DTiPhoneSimulatorErrorDomain, Code = 2)
</blockquote>

<a href="https://i.stack.imgur.com/S92eD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/S92eD.png" alt="Screenshot for error"></a>

UPDATE: 

This might sound silly but I went to Xcode/preference/Downloads with intentions of seeing a IOS 8.0 Simulator but there was none. Could this be the problem? Am I suppose to have a IOS 8.0 Simulator? If so can someone direct me how to get it? Also, under the "Downloads" tab in Xcode preference I do see IOS 7.0 and 7.1 Simulators and both work fine with Xcode 5.

Xcode beta 6 iOS 8: Simulator not working

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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我无法成功启动模拟器。启动IOS模拟器后，出现以下错误：“无法启动IOS模拟器。”在IOS模拟器错误之后，我从Xcode读取中得到一个错误： 无法在模拟器中运行应用程序运行时遇到错误(域= DTiPhoneSimulatorErrorDomain，代码= 2)​​更新：这听起来可能很愚蠢，但我去了Xcode/preference/Downloads，想看看IOS 8.0模拟器，但什么都没有。这会是

问Xcode beta 6 iOS 8:模拟器不工作
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