WebSocket connection failed with

Xcode 控制台输出

[warn][tid:com.facebook.React.WebSocketExecutor][RCTWebSocketExecutor.m:128] WebSocket connection failed with error Error Domain=NSPOSIXErrorDomain Code=61 "Connection refused"

[warn][tid:com.facebook.react.RCTBridgeQueue][RCTWebSocketExecutor.m:71] Connection to http://localhost:8081/debugger-proxy timed out. Are you running node proxy? If                 you are running on the device, check if you have the right IP                 address in `RCTWebSocketExecutor.m`.

[error][tid:main] socket closed

[error][tid:com.facebook.React.WebSocketExecutor] socket closed

解决:

在RCTWebSocketExecutor.m文件中修改setup函数中的localhost为你电脑的IP地址(例如:192.168.0.104)
修改前代码:

- (void)setUp
{
  if (!_url) {
    NSUserDefaults *standardDefaults = [NSUserDefaults standardUserDefaults];
    NSInteger port = [standardDefaults integerForKey:@"websocket-executor-port"] ?: 8081;
    NSString *URLString = [NSString stringWithFormat:@"http://localhost:%zd/debugger-proxy", port];
    _url = [RCTConvert NSURL:URLString];
  }
  // 此处省略后面代码
}

修改后代码:

- (void)setUp
{
  if (!_url) {
    NSUserDefaults *standardDefaults = [NSUserDefaults standardUserDefaults];
    NSInteger port = [standardDefaults integerForKey:@"websocket-executor-port"] ?: 8081;
    NSString *URLString = [NSString stringWithFormat:@"http://192.168.0.104:%zd/debugger-proxy", port];
    _url = [RCTConvert NSURL:URLString];
  }
  // 此处省略后面代码
}

题外话:在终端检测Node.js所启动服务的端口是否为默认的8081

/Volumes/Transcend/ReactNativeProjects/AwesomeProject/node_modules/react-native/packager ~
 ┌────────────────────────────────────────────────────────────────────────────┐ 
 │  Running packager on port 8081.                                            │ 
 │                                                                            │ 
 │  Keep this packager running while developing on any JS projects. Feel      │ 
 │  free to close this tab and run your own packager instance if you          │ 
 │  prefer.                                                                   │ 
 │                                                                            │ 
 │  https://github.com/facebook/react-native                                  │ 
 │                                                                            │ 
 └────────────────────────────────────────────────────────────────────────────┘ 
Looking for JS files in