flutter 环境搭建记录

1.Waiting for observatory port to be available 待解决
大概找到问题所在：https://github.com/flutter/flutter/issues/18409
由于我的机器是没有管理员权限导致：/usr/bin/log stream无法正常执行
由于没管理员权限，暂时没法验证方案。
尝试了一下iOS11以下的模拟器是可以正常debug的。

/// Launches the device log reader process on the host. 
 Future<Process> launchDeviceLogTool(IOSSimulator device) async { 
   // Versions of iOS prior to iOS 11 log to the simulator syslog file. 
   if (await device.sdkMajorVersion < 11) 
     return runCommand(<String>['tail', '-n', '0', '-F', device.logFilePath]); 
  
   // For iOS 11 and above, use /usr/bin/log to tail process logs. 
   // Run in interactive mode (via script), otherwise /usr/bin/log buffers in 4k chunks. (radar: 34420207) 
   return runCommand(<String>[ 
     'script', '/dev/null', '/usr/bin/log', 'stream', '--style', 'syslog', '--predicate', 'processImagePath CONTAINS "${device.id}"', 
   ]); 
 }