blocks|key|4371611|text|当您不允许通过本地主机进行不安全的连接时，或者您试图通过http接受不安全的连接时，就会出现此问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4371612|要解决此问题，请在info.plist上添加以下内容|offset|length|style|CODE|4371613|<key>NSAppTransportSecurity</key>
++++<dict>
++++++++<key>NSAllowsArbitraryLoads</key>
++++++++<true/>
++++++++<key>NSAllowsArbitraryLoadsInWebContent</key>
++++++++<true/>
++++++++<key>NSAllowsLocalNetworking</key>
++++++++<true/>
++++</dict>|code-block|syntax|javascript|4371614|entityMap^0|0|9|A|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|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|$]]

This problem happens when you not allow unsecure connections via localhost, or maybe you tried to accept unsecure connections via http.

To fix this, add this on <code>info.plist</code>:

<pre><code>&lt;key&gt;NSAppTransportSecurity&lt;/key&gt;
 &lt;dict&gt;
 &lt;key&gt;NSAllowsArbitraryLoads&lt;/key&gt;
 &lt;true/&gt;
 &lt;key&gt;NSAllowsArbitraryLoadsInWebContent&lt;/key&gt;
 &lt;true/&gt;
 &lt;key&gt;NSAllowsLocalNetworking&lt;/key&gt;
 &lt;true/&gt;
 &lt;/dict&gt;
</code></pre>

blocks|key|4371569|text|当我捆绑我的应用程序时，也遇到了同样的问题。检查您的main.jsbundle是否指向您的主项目|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4371570|​|4371571|📷|atomic|4371572|4371573|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/5131d07b97a3eb92e040f9aaa4439e49.png|imageAlt^0|Q|D|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|K|3|G|5|6|7|12|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S|T|-4]]]]

Had same problem when I did bundle my app.
Check that your <code>main.jsbundle</code> is targeted to your main Project

<a href="https://i.stack.imgur.com/tD3Pl.png" rel="noreferrer"><img src="https://i.stack.imgur.com/tD3Pl.png" alt=""></a>

blocks|key|4371198|text|关闭模拟器和终端。打开新的一个并转到您的项目，然后升级您的react-native，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4371199|react-native+upgrade|code-block|syntax|javascript|4371200|问题在：Infinite+recursion+in+RCTFatal+when+the+bundle+fails+to+execute。|offset|length|4371201|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/facebook/react-native/issues/5090^0|0|0|4|1R|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]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Close your simulator and the terminal. Open new one and go to your project, then upgrade your react-native like this:

<pre><code>react-native upgrade
</code></pre>

Issue in: <a href="https://github.com/facebook/react-native/issues/5090" rel="nofollow noreferrer">Infinite recursion in RCTFatal when the bundle fails to execute</a>.

blocks|key|4371992|text|尝试运行以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4371993|$+sudo+xcodebuild+-license|offset|length|style|CODE|4371994|这可能会解决这个问题。这对我很有效。|4371995|entityMap^0|0|0|Q|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

Try running this code:

<code>$ sudo xcodebuild -license</code>

This may fix the issue. This works for me.

blocks|key|4371243|text|我遇到了同样的错误，只能通过Xcode运行这个应用程序。react-native+run-ios不起作用。要解决此问题，您需要删除位于YOUR_PROJECT/ios/build/的build文件夹。在此之后，您应该能够再次通过react-native+run-ios运行您的应用程序。希望这能有所帮助。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4371244|entityMap^0|S|K|1V|N|2J|5|36|K|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|G|$]]

I had the same error and was able to run the app only through Xcode. <code>react-native run-ios</code> did not work. To resolve the issue you need to remove the <code>build</code> folder at <code>YOUR_PROJECT/ios/build/</code>. After this you should be able to run your app through <code>react-native run-ios</code> again. Hope this helps.

blocks|key|4371601|text|对我来说，问题是它不能创建JS包。当从Xcode构建时，它没有声明错误，所以您没有办法知道这一点。要查找错误，请运行以下命令。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4371602|react-native+bundle+--platform+ios+--dev+false+--entry-file+index.ios.js+--bundle-output+./ios/release/main.jsbundle+--assets-dest+./ios/release/main.jsbundle|offset|length|style|CODE|4371603|对我来说，错误是因为缺少PureRenderMixin组件。其解决方案可以在这里找到：https://github.com/facebook/react-native/issues/13078。基本上，你必须手动安装react@16.0.0-alpha.3。这可以通过运行此命令来完成。|4371604|npm+i+--save+react@16.0.0-alpha.3|4371605|这个问题现在每个人都在发生，因为react+alphas的更新版本正在发布(特别是alpha.5)，并且它们正在破坏react-native构建。|4371606|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/facebook/react-native/issues/13078^0|0|0|4E|0|17|1H|0|0|0|X|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@$D|X|E|Y|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Z|8|@]|9|@$D|10|E|11|1|12]]|A|$]]|$1|J|3|K|5|6|7|13|8|@$D|14|E|15|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|16|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]]]

For me the issue was it couldn't create the JS bundle. It doesn't state the error when building from Xcode so there is no way for you to know this. To find the error run the following command.

<code>react-native bundle --platform ios --dev false --entry-file index.ios.js --bundle-output ./ios/release/main.jsbundle --assets-dest ./ios/release/main.jsbundle
</code>

For me the error was something with missing PureRenderMixin component. To which the solution can be found here: <a href="https://github.com/facebook/react-native/issues/13078" rel="noreferrer">https://github.com/facebook/react-native/issues/13078</a>. Basicly you have to manually install react@16.0.0-alpha.3. This can be done via running this command.

<code>npm i --save react@16.0.0-alpha.3</code>

This issue is now happening for everybody because newer versions of react alphas are being released (particularly alpha.5) and they are breaking react-native builds.

blocks|key|4371914|text|Solution+-->+npm+start然后打开新的终端并转到您的项目路径，然后点击react-native+run-ios+it+works+for+me|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4371915|entityMap^0|D|9|18|K|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Solution --> 
<code>npm start</code> then open new Terminal and go to your project path and then hit
<code>react-native run-ios</code> it works for me

blocks|key|4372989|text|我不得不在一个单独的终端中运行"react-native+start“。由于某种原因，它没有运行|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4372990|Edit：另外，事实证明这是必要的，因为没有正确设置文件权限。我可以通过在受影响的项目目录中运行以下命令来修复它。|offset|length|style|CODE|4372991|chmod+777+node_modules/react-native/scripts/launchPackager.command|4372992|entityMap^0|0|0|4|0|0|1U|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|K|$]]

I had to run &quot;react-native start&quot; in a separate terminal. For some reason it wasn't running
<code>Edit</code>: Also, it turns out this was necessary because of a file permission not getting set properly. I am able to fix it by running the following command in an affected project directory.
<code>chmod 777 node_modules/react-native/scripts/launchPackager.command</code>

blocks|key|4371966|text|只需在终端react-native+start中运行|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4371967|cd+your+react+native+app+directory/+react-native+start+|code-block|syntax|javascript|4371968|它将启动打包程序，现在不要关闭这个终端窗口，在另一个终端窗口中运行你的项目。这是我发现的唯一能让它正常工作的东西。|4371969|entityMap^0|5|I|0|0|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]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Just run in Terminal <code>react-native start</code>:

<pre><code>cd your react native app directory/ react-native start 
</code></pre>

It will start up the packager, now don't close this terminal window, in another terminal window run your project. This is the only want that I found to get it working properly.

blocks|key|4372224|text|首先关闭模拟器，然后在终端上运行这些程序|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4372225|npm+install

react-native+run-ios|code-block|syntax|javascript|4372226|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|$]]

first close the simulator, then run these on terminal

<pre><code>npm install

react-native run-ios
</code></pre>

blocks|key|4371163|text|这是react-native+v0.42.1的一个问题。尝试关闭所有终端和XCode实例并运行：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4371164|launchctl+unload+~/Library/LaunchAgents/com.github.facebook.watchman.plist
watchman+version
react-native+run-ios|code-block|syntax|javascript|4371165|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|$]]

This is an issue with react-native v0.42.1. Try to close all terminal and XCode instances and run:

<pre><code>launchctl unload ~/Library/LaunchAgents/com.github.facebook.watchman.plist
watchman version
react-native run-ios
</code></pre>

blocks|key|4371591|text|我也有同样的问题。但我的问题是我的Mac和iPhone不在同一个wifi网络中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4371592|因此，请确保它们都在同一网络中，并再次重建。如果不是这样，请尝试其他成员在这里提到的解决方案。|4371593|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|$]]

I had this same issue. But my problem was my Mac and iPhone were not in same wifi network. 

So ensure that they are all in same network and rebuild once again. If this is not the case, try the solutions mentioned by other members here.

blocks|key|4371110|text|检查一下你的网络代理，最好把它关掉。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4371111|或者，您应该找到其他方法来维护打包服务器。|4371112|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|$]]

check your network proxy , better shut it down.

or u should find an other way to maintain the packager server

blocks|key|4371371|text|在info.plist中的NSExceptionDomains+dict中检查您的'localhost‘键|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4371372|如果它不存在，就会导致错误。|4371373|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|$]]

check your 'localhost' key at NSExceptionDomains dict in info.plist 

if it doesn't exist, it causes error.

blocks|key|4371447|text|我发现最简单/最快捷的方法是在模拟器中退出应用程序(2+x+Cmd+%2B+Shift+%2B+H)并重新启动。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4371448|entityMap^0|U|F|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

I have found the easiest/quickest way to bypass this is to exit the app within the simulator (2 x <code>Cmd + Shift + H</code>) and re-launch.

blocks|key|4371284|text|在重启mac之后，这种情况也发生在我身上。当你在模拟器上运行你的应用程序时，会打开一个launchPackager终端窗口。我关闭了该窗口并终止了进程(我还关闭了模拟器)，然后再次运行react-native+run-ios，一切工作正常。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4371285|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|$]]

It has happened to me as well, after restarting my mac. There's a launchPackager terminal window opening up when you run your app on the simulator. I closed that window and terminated the process (I also cloosed the simulator), then run again react-native run-ios and everything works fine.

blocks|key|4371313|text|在我的例子中，这个问题是通过重新启动adb服务器来修复的：adb+kill-server+&&+adb+start-server|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4371314|entityMap^0|I|3|T|Z|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

In my case the problem was fixed by restarting the <code>adb</code> server: <code>adb kill-server &amp;&amp; adb start-server</code>

blocks|key|4371326|text|我遇到了这个问题，因为well...the的问题是打包程序没有运行，这可能是因为我的默认外壳是zsh。react-native尝试打开一个新的终端窗口并运行.../node_modules/react-native/packager/launchPackager.command，但这并没有运行。手动运行它(并保持运行)为我修复了这个问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4371327|entityMap^0|26|1P|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

I had this issue happen for me as well...the issue was the packer wasn't running it seemed probably because my default shell was zsh. react-native tires to open a new terminal window and run <code>.../node_modules/react-native/packager/launchPackager.command</code> but this didn't run. Manually running that (and keeping it running) fixed this for me.

blocks|key|4372698|text|确保你的项目中有.jsbundle|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4372699|添加|4372700|react-native+bundle+--dev+false+--entry-file+index.js+--bundle-output+ios/main.jsbundle+--platform+ios|code-block|syntax|javascript|4372701|在您的react原生代码中，尝试重新打开项目|4372702|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

make sure you have .jsbundle in your your project

Add 

<pre><code>react-native bundle --dev false --entry-file index.js --bundle-output ios/main.jsbundle --platform ios
</code></pre>

in your react native code
try to reopen the project

blocks|key|4372353|text|步骤1:在xcode中打开.xcodeworkspace项目，通过“终端”导航，“打开/ios/.xcodeworkspace”按Enter。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4372354|步骤2:删除文件夹中的main.jsbundle文件|4372355|步骤3:返回到VS代码，输入react-native+bundle+--entry-file+index.js+--platform+ios+--dev+false+--bundle-output+ios/main.jsbundle+--assets-dest+ios|offset|length|style|CODE|4372356|这将生成新的main.jsbundle文件。|4372357|第4步:+react-native+run-ios|4372358|您将不会再看到该错误|4372359|entityMap^0|0|0|E|3C|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@$F|U|G|V|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|W|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|X|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|Y|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|Q|$]]

Step 1:
Open the .xcodeworkspace project in your xcode by navigating it via &quot;Terminal&quot;,
&quot;open /ios/.xcodeworkspace&quot; Hit Enter.
Step 2:
Delete the main.jsbundle file inside the folder you have
Step 3:
Go back to VS Code, type this,
<code>react-native bundle --entry-file index.js --platform ios --dev false --bundle-output ios/main.jsbundle --assets-dest ios</code>
This generate you the new main.jsbundle file.
Step 4:
react-native run-ios
you wont see the error again

blocks|key|4371529|text|另一件对我有效的事情是，在xcode中打开项目，然后清理和构建它。通常它会重新运行打包服务器并解决问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4371530|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|$]]

another thing that working for me , is to open the project in xcode, and then clean and build it. usually it reruns the packaging server and solve the problem.

blocks|key|4372227|text|执行以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4372228|killall+-9+node
rm+-rf+ios/build
react-native+run-ios|code-block|syntax|javascript|4372229|它将打开launchpackager.command，应用程序将安装在ios模拟器上|4372230|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Execute the below command:

<pre><code>killall -9 node
rm -rf ios/build
react-native run-ios
</code></pre>

it will open launchpackager.command and the application will install on the ios simulator

blocks|key|4371848|text|请确保launchPackage.command正在终端中运行，然后再次尝试运行。它将构建捆绑包。它有点像webpack-dev-server。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4371849|entityMap^0|3|L|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Make sure <code>launchPackage.command</code> are running in a terminal and try run again. It will build the bundle. It is kinda like webpack-dev-server.

blocks|key|4371991|text|这是因为您的客户端无法访问您的打包服务器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4371992|如果你和我一样是一名中国程序员，我想你可能会使用VPN来通过GFW。当您的VPN工具处于‘全局模式’时，您的所有请求都将遍历全球，无法访问本地主机|4371993|尝试“自动代理模式”。|4371994|如果您不是来自中国，或者您的VPN设置已经是“自动代理模式”，我建议您关闭您的打包服务器，然后重试。|4371995|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

It's because your client cannot reach your packager server.

If you are a Chinese Coder just as I am, I think you might using VPN get through the GFW. When your VPN tool is in 'Global Mode', all your request will travel through the world and cannot get localhost

Try 'Auto Proxy Mode'.

If you are not come from China, or your VPN setting is already 'Auto Proxy Mode', I suggest you shut down your packager server and try again.

blocks|key|4372175|text|发生这种情况的原因是，如果您已经安装了Visual+Studio+Code+React+Native+Tools，但是您一直尝试在终端中使用react+native+:它将在第一次工作，但随后它将停止并显示红色的no+...another屏幕。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4372176|相反，从vscode启动react+native可以完美地工作。|4372177|entityMap|0|LINK|mutability|MUTABLE|url|https://marketplace.visualstudio.com/items?itemName=vsmobile.vscode-react-native^0|12|I|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

...another reason why this is happening is if you have installed Visual Studio Code <a href="https://marketplace.visualstudio.com/items?itemName=vsmobile.vscode-react-native" rel="nofollow noreferrer">React Native Tools</a> but you keep trying to use react native in the terminal: it will work the first time but then it will stop and show you the red no bundle screen.

launching react native from vscode works perfectly instead...

blocks|key|4371745|text|在我的用例中，我必须删除node_modules目录并运行npm+install。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4371746|$+rm+-rf+node_modules+++(make+sure+you're+in+the+ios+project+directory)
$+npm+install|code-block|syntax|javascript|4371747|如果出现错误"dyld:库未加载:+/usr/local/opt/icu4c/lib/libicui18n.58.dylib"，“，请执行以下操作：|4371748|$+brew+uninstall+--force+node+--ignore-dependencies+node
$+brew+uninstall+icu4c+--ignore-dependencies+icu4c
$+brew+install+icu4c
$+brew+unlink+icu4c+&&+brew+link+icu4c+--force
$+brew+install+node

$+npm+install|4371749|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For my use case, i had to remove node_modules directory and run npm install.

<pre><code>$ rm -rf node_modules (make sure you're in the ios project directory)
$ npm install
</code></pre>

If you get error "dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.58.dylib", do the following:

<pre><code>$ brew uninstall --force node --ignore-dependencies node
$ brew uninstall icu4c --ignore-dependencies icu4c
$ brew install icu4c
$ brew unlink icu4c &amp;&amp; brew link icu4c --force
$ brew install node

$ npm install
</code></pre>

blocks|key|4371770|text|尝试添加以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4371771|<key>NSAppTransportSecurity</key>
<dict>
++++<key>NSAllowsArbitraryLoads</key>
++++<true/>
++++<key>NSAllowsArbitraryLoadsInWebContent</key>
++++<true/>
++++<key>NSAllowsLocalNetworking</key>
++++<true/>
</dict>|code-block|syntax|javascript|4371772|​|4371773|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

try to add this :

<pre><code>&lt;key&gt;NSAppTransportSecurity&lt;/key&gt;
&lt;dict&gt;
 &lt;key&gt;NSAllowsArbitraryLoads&lt;/key&gt;
 &lt;true/&gt;
 &lt;key&gt;NSAllowsArbitraryLoadsInWebContent&lt;/key&gt;
 &lt;true/&gt;
 &lt;key&gt;NSAllowsLocalNetworking&lt;/key&gt;
 &lt;true/&gt;
&lt;/dict&gt;
</code></pre>

blocks|key|4371836|text|export+FORCE_BUNDLING=true为我工作。在控制台中有一个警告，它没有被捆绑。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4371837|entityMap^0|0|Q|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

<code>export FORCE_BUNDLING=true</code> worked for me. There was a warning in the console that it was not getting bundled.

blocks|key|4372419|text|我在我的macbook上通过电缆和wifi连接到网络，禁用了wifi，只需点击run，它就起作用了！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4372420|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|$]]

I was connected to the network by cable and wifi on my macbook, disabled wifi and just hit run and it worked!

blocks|key|4372459|text|我们通过删除构建脚本中的SKIP_BUNDLING选项解决了此问题，RN文档建议添加该选项以加快调试构建速度。真正的修复(针对我们的原因)包含在RN+0.57中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4372460|https://github.com/facebook/react-native/issues/20553|offset|length|4372461|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1H|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

We got around this by removing the SKIP_BUNDLING option in the build script that the RN docs suggested adding to speed up the debug build. The real fix (for our cause) is included in RN 0.57:

<a href="https://github.com/facebook/react-native/issues/20553" rel="nofollow noreferrer">https://github.com/facebook/react-native/issues/20553</a>

blocks|key|4372006|text|禁用全局代理(阴影袜子)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4372007|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|$]]

Turn off global proxy (shadowsocks)

blocks|key|4372587|text|这是因为您可能已经关闭了Metro+Bundler窗口，否则它可能会崩溃。只需在项目目录中打开另一个终端/cmd并运行npm+start即可。通过运行npm+start，React+Native将再次启动MetroBundler窗口。在bundler完成BUNDLE过程之后，只需重新加载应用程序，您就可以开始工作了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4372588|entityMap^0|1N|9|23|9|3J|6|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

This is because you probably have close the Metro Bundler Window or it might be crashed. just open another terminal/cmd in the project directory and run <code>npm start</code>. By Running <code>npm start</code> React Native will launch the MetroBundler Window once again. After bundler finishes the <code>BUNDLE</code> process, just reload the Application and you will be good to go.

blocks|key|4372070|text|好吧，这可能听起来很奇怪，但这些答案对我来说都不起作用。我现在的版本是react-native+0.60，这个问题发生在ios和android上。对我有效的唯一解决方案是运行react-native+run-ios或react-native+run-android，然后，当出现错误时，运行npm+install+(保持捆绑和模拟器打开)，然后运行react-native+run-ios或react-native+run-android|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4372071|entityMap^0|2F|K|30|O|41|B|4U|K|5F|O|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|G|$]]

Ok, that may sound weird but none of those answers worked for me.
I'm now at react-native 0.60 and the problem was happening on ios and android. 
the only solution that worked for me was running 
<code>react-native run-ios</code> or <code>react-native run-android</code> 
Then, when the error appears, run
<code>npm install</code> (Keep the bundler and the simulator open)
then run <code>react-native run-ios</code> or <code>react-native run-android</code>

blocks|key|4372100|text|打开终端窗口|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4372101|cd+into+YOUR_PROJECT/ios|code-block|syntax|javascript|4372102|使用rm+-r+build删除build文件夹|offset|length|style|CODE|4372103|之后，在Xcode中打开项目并运行一次。它将在启动服务器并创建main.jsbundle文件的同时运行。|4372104|现在，如果您再次从终端运行react-native+run-ios，它将按预期工作。|4372105|希望这能有所帮助！|4372106|entityMap^0|0|0|2|B|0|V|D|0|D|K|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@$I|10|J|11|K|L]]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@$I|13|J|14|K|L]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|15|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|T|$]]

Open a terminal window

<pre><code>cd into YOUR_PROJECT/ios
</code></pre>

Remove the build folder with <code>rm -r build</code>

After that open your project in Xcode and run once. it will run with starting the server and create the <code>main.jsbundle</code> file.

Now if you Run <code>react-native run-ios</code> from terminal again it will work as expected.

Hope it will help!.

blocks|key|4372312|text|我尝试了上面的大多数答案。但唯一有效的是watchman命令(我使用react-native:+"0.60.4")：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4372313|watchman+watch-del-all|4372314|entityMap^0|Y|M|0|0|M|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

I tried most of answers above.
But the only that works for is a watchman command(I use <code>react-native: "0.60.4"</code>):

<code>watchman watch-del-all</code>

blocks|key|4372392|text|对于Mcafee+Macbook用户：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4372393|sudo启动sudo删除com.mcafee.agent.macmn|4372394|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|$]]

For Mcafee Macbook users :
sudo launchctl remove com.mcafee.agent.macmn

blocks|key|4372408|text|也许你忘了这一步|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4372409|cd+ios+&&+pod+install|code-block|syntax|javascript|4372410|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|$]]

Maybe you forgot this step
<pre><code>cd ios &amp;&amp; pod install
</code></pre>

blocks|key|4372955|text|我也有这个屏幕，但我的问题是我前一天晚上一直在使用代理(使用Charles监视来自RN环境的网络请求)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4372956|一旦我关闭了代理，应用程序的构建/运行在我的模拟器中就没有问题了。|4372957|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|$]]

I had this screen as well, but my problem was that I had been using a proxy the night before (using Charles to monitor network requests from the RN env).
Once I shut off the proxy the app built/ran with no problems in my emulator.

blocks|key|4373043|text|如果像我一样，您有一个命令设置为在启动时在等待输入的终端会话(.bashrc/.bash_profile)中执行(在我的例子中，是使用ssh-add的SSH键的密码短语)，那么您会注意到它实际上阻止了打开的终端启动地铁服务器！|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4373044|尝试在启动时禁用该命令(或者至少在由React+Native打开的终端中)。它对我起作用了！|4373045|entityMap^0|1V|7|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

If, like me, you have a command set to be executed at startup in a terminal session (.bashrc/.bash_profile) that awaits for an input (in my case, the passphrase for an SSH Key with <code>ssh-add</code>), then you'll notice it actually prevents the opened Terminal to start the Metro server!
Try disabling that command at startup (or at least in the Terminal opened by React Native). It worked for me!

blocks|key|4371400|text|关闭当前运行的React+Packager终端窗口，然后从Xcode重新运行您的iOS项目应该是可行的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4371401|entityMap^0|7|E|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Closing the currently running <code>React Packager</code> terminal window, and then re-running your iOS project from Xcode should work.

blocks|key|4372795|text|如果您正在运行IOS模拟器，请确保需要运行此命令|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4372796|react-native+run-android或npm+run-android|4372797|一旦你运行上面的命令metro+bundler将启动，然后运行react-nagtive+run-ios它将工作。|4372798|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|$]]

If you are running IOS simulator make sure need to run this command 

react-native run-android 
or 
npm run-android 

once you running above command metro bundler will start , then run react-nagtive run-ios it will work .

When I run a react-native project, I get a error <code>no bundle URL present</code> , but I don't know what mistakes I do, I was very confused.

<a href="https://i.stack.imgur.com/SUaiY.png" rel="noreferrer"><img src="https://i.stack.imgur.com/SUaiY.png" alt="enter image description here"></a>

What is the meaning of 'No bundle URL present' in react-native?

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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当我运行react原生项目时，我得到了一个错误no bundle URL present，但我不知道我犯了什么错误，我非常困惑。​​

问在react-native中“No bundle URL present”是什么意思？
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问在react-native中“No bundle URL present”是什么意思？
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