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1.3 Debug tools

1.developer menu

2.Chrome Devtools

3.log

console.log('some text');
console.dir({a:1, b:2, c:3});
debugger;//breaking point

4.Atom & nuclide

5.inspect

Open Atom Command Palette package with cmd-shift-p and search "inspector", then click "Nuclide React Native Inspector:Show"

6.Real device

6.1 Deploy to real device project_name/ios/project_name/AppDelegate.m

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

  /**
   * OPTION 2
   * Load from pre-bundled file on disk. The static bundle is automatically
   * generated by the "Bundle React Native code and images" build step when
   * running the project on an actual device or running the project on the
   * simulator in the "Release" build configuration.
   */

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

6.2 Debug in real device

1.project_name/ios/project_name/AppDelegate.m

  jsCodeLocation = [NSURL URLWithString:@"http://172.28.0.230:8081/index.ios.bundle?platform=ios&dev=true"];

2.node_modules/react-native/Libraries/WebSocket/RCTWebSocketExecutor.m

  if (!_url) {
    NSUserDefaults *standardDefaults = [NSUserDefaults standardUserDefaults];
    NSInteger port = [standardDefaults integerForKey:@"websocket-executor-port"] ?: 8081;
    NSString *URLString = [NSString stringWithFormat:@"http://172.28.0.230:%zd/debugger-proxy?role=client", port];
    _url = [RCTConvert NSURL:URLString];
  }