在使用appium的时候，突然弹出窗口询问是否升级到1.10，一时手贱就点击了。升级完成后，用appium打开模拟器以及app是没问题的，但用python测试脚本调用，appium日志提示：
[XCUITest] Simulator udid not provided, using desired caps to create a new simulator
[simctl] Creating simulator with name 'appiumTest-iPhone 6s Plus', device type id 'iPhone 6s Plus' and runtime id 'undefined'
[simctl] Error: simctl error running 'create': Invalid runtime: undefined
原来的配置文件为：
{
"platformName": "ios",
"platformVersion": "12.1",
"deviceName": "iPhone 6 plus Simulator",
"app": "/Users/wangchangpeng/exshell/exbell_ios_1.ipa",
"automationName": "XCUITest",
"noReset": "true"
}
看日志的错误提示有两点，一个是没定义模拟器，二是没有udid.对配置文件做了相应修改
{
"platformName": "ios",
"platformVersion": "12.1",
"deviceName": "iPhone 6s Plus",
"app": "/Users/wangchangpeng/exshell/exbell_ios_1.ipa",
"automationName": "XCUITest",
"noReset": "true",
"udid": "1B1CC2F6-3A09-4C10-B824-754D9CE964D1"
}
脚本执行通过，升级需谨慎啊！