Flutter Run 不起作用，在 iPhone 上启动应用程序时出错

Question

我最近更新了flutter版本。在那之后，flutter run 在 iPhone 上不起作用。我正在使用安卓工作室。 android studio 上的运行按钮也不适用于 iPhone，但模拟器工作正常。
我收到以下错误。我已将运行者模式设置为发布。仍然没有运气。

"Error launching application on Raj iPhone."

flutter 版本。

Flutter (Channel master, 1.24.0-8.0.pre.374, on Mac OS X 10.15.7 19H2darwin-x64, locale en-GB)

我没有收到任何其他错误。所以我运行 flutter run -verbose 我得到以下信息

#0 throwToolExit (package:flutter_tools/src/base/common.dart:10:3)#1 RunCommand.runCommand (package:flutter_tools/src/commands/run.dart:618:7)#2 FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:1119:12)#3 FlutterCommand.run. (package:flutter_tools/src/runner/flutter_command.dart:974:27)#4 AppContext.run. (package:flutter_tools/src/base/context.dart:150:19)#5 AppContext.run (package:flutter_tools/src/base/context.dart:149:12)#6 CommandRunner.runCommand (package:args/command_runner.dart:197:13)#7 FlutterCommandRunner.runCommand. (package:flutter_tools/src/runner/flutter_command_runner.dart:264:9)#8 AppContext.run. (package:flutter_tools/src/base/context.dart:150:19)#9 AppContext.run (package:flutter_tools/src/base/context.dart:149:12)#10 FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:220:5)#11 run.. (package:flutter_tools/runner.dart:63:9)#12 run. (package:flutter_tools/runner.dart:61:12)#13 AppContext.run. (package:flutter_tools/src/base/context.dart:150:19)#14 AppContext.run (package:flutter_tools/src/base/context.dart:149:12)#15 runInContext (package:flutter_tools/src/context_runner.dart:70:10)#16 main (package:flutter_tools/executable.dart:90:3)

        [ +113 ms] (lldb) process detach [ +254 ms] ensureAnalyticsSent: 255ms [   +1 ms] Running shutdown hooks [       

] Shutdown hook priority 4 [ +52 ms] Shutdown hooks complete [
] exiting with code 1

我已经完成flutter clean并再次检查。还是一样的问题。
谢谢

Answer 1

在 flutter/packages/flutter_tools/lib/src/ios/devices.dart ，找到以下代码块:

_logger.printTrace('Application launched on the device. Waiting for observatory port.');
Uri localUri;
try {
  localUri = await observatoryDiscovery.uri.timeout(const Duration(seconds: 30));
} on TimeoutException {
  await observatoryDiscovery.cancel();
}

将超时增加到更大的数字，例如，60 秒为我修复了它:

localUri = await observatoryDiscovery.uri.timeout(const Duration(seconds: 60));

引用:

https://github.com/flutter/flutter/issues/72161

https://github.com/flutter/flutter/blob/a603714610f8c9c831e7d85071274460d70c18da/packages/flutter_tools/lib/src/ios/devices.dart#L432