react native： No bundle url pres

//  jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index" fallbackResource:nil];

将上面的换成下面的：

如果到要真机上测试，127.0.0.1需要换成自己的网络ip。（当然还要有证书）

#ifdef DEBUG

    jsCodeLocation = [NSURL URLWithString:@"http://127.0.0.1:8081/index.bundle?platform=ios&dev=true"];

#else

  jsCodeLocation = [[NSBundle mainBundle] URLForResource:@"main"withExtension:@"jsbundle"];

#endif

此外：上面应该就好了。如果不好，有人说是网络权限问题：

My problem has been solved by adding NSAllowsLocalNetworking to Info.plist

<key>NSAppTransportSecurity</key>

<dict>

<key>NSAllowsArbitraryLoads</key>

<true/>

<key>NSAllowsArbitraryLoadsInWebContent</key>

<true/>

<key>NSAllowsLocalNetworking</key>

<true/>

</dict>

</key>