求各位帮忙看看，ibimobiledevice 和 ideviceinstaller 都已经安装。
APPIUM 版本是：1.4.13(通过官方的 dmg 包安装的)
IOS 模拟器是：5s+ ios 8.3

IOS Settings 截图：

info: [debug] App is not installed. Will try to install the app.
info: [debug] Installing ipa found at /Users/hucan/Desktop/psa App/小金袋.ipa

info: [debug] Cleaning up appium session
info: [debug] Error: Command failed: /bin/sh -c ideviceinstaller -u 8FE6A543-C655-4A3F-86D7-00E0BB0DFC07 -l 

    at ChildProcess.exithandler (child_process.js:751:12)
    at ChildProcess.emit (events.js:110:17)
    at maybeClose (child_process.js:1015:16)
    at Socket.<anonymous> (child_process.js:1183:11)
    at Socket.emit (events.js:107:17)
    at Pipe.close (net.js:485:12)
info: [debug] Responding to client with error: {"status":33,"value":{"message":"A new session could not be created. (Original error: Command failed: /bin/sh -c ideviceinstaller -u 8FE6A543-C655-4A3F-86D7-00E0BB0DFC07 -l \n)","killed":false,"code":2,"signal":null,"cmd":"/bin/sh -c ideviceinstaller -u 8FE6A543-C655-4A3F-86D7-00E0BB0DFC07 -l ","origValue":"Command failed: /bin/sh -c ideviceinstaller -u 8FE6A543-C655-4A3F-86D7-00E0BB0DFC07 -l \n"},"sessionId":null}

error: Failed to start an Appium session, err was: Error: Command failed: /bin/sh -c ideviceinstaller -u 8FE6A543-C655-4A3F-86D7-00E0BB0DFC07 -l 

解决方案：
更新你的 brew 到最新版本：
1、在终端输入一下命令：brew update&&brew upgrade&&brew clean
慢慢等吧可能会比较慢
2、卸载已经存在的 libimobiledevice 和 ideviceinstaller，执行命令为：brew unistall libimobiledevice 和 brew unintall ideviceinstaller
3、重新安装 libimobiledevice 和 ideviceinstaller 命令为：brew install --HEAD libimobiledevice 和
brew install --HEAD ideviceinstaller