最近需要做 wap 端的 iOS 自动化测试，现在我可以启动 Safari，使用 driver.get('www.baidu.com') 方法启动百度，最后 appium 报错，iPhone 的 Safari 没有打开百度，打开的却是 appium.io 的网址；appium 的部分日志如下：
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[iOS] Could not find any webviews yet, refreshing/retrying
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[iOS] Could not find any webviews yet, refreshing/retrying
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[iOS] Could not find any webviews yet, refreshing/retrying
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[iOS] Could not find any webviews yet, refreshing/retrying
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[iOS] Could not find any webviews yet, refreshing/retrying
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[iOS] Could not find any webviews yet, refreshing/retrying
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[iOS] Could not find any webviews yet, refreshing/retrying
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[iOS] Could not find any webviews yet, refreshing/retrying
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[iOS] Could not find any webviews yet, refreshing/retrying
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[iOS] Could not find any webviews yet, refreshing/retrying
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[debug] [iOS] Retrieving contexts and views
[debug] [iOS] Selecting by url: true (expected url: 'http://appium.io')
[debug] [RemoteDebugger] Getting WebKitRemoteDebugger pageArray: localhost, 27753
[debug] [RemoteDebugger] Sending request to: http://localhost:27753/json
[iOS] Attempted to get a list of webview contexts but could not connect to ios-webkit-debug-proxy. If you expect to find webviews, please ensure that the proxy is running and accessible
[debug] [iOS] No web frames found.
[XCUITest] Error: Could not navigate to webview; there are none!
at XCUITestDriver.spinHandles$ (../../../lib/commands/context.js:511:13)
at tryCatch (/usr/local/lib/node_modules/appium/node_modules/babel-runtime/regenerator/runtime.js:67:40)
at GeneratorFunctionPrototype.invoke as _invoke
at GeneratorFunctionPrototype.prototype.(anonymous function) as next
at GeneratorFunctionPrototype.invoke (/usr/local/lib/node_modules/appium/node_modules/babel-runtime/regenerator/runtime.js:136:37)
Error: Could not navigate to webview; there are none!
at XCUITestDriver.spinHandles$ (../../../lib/commands/context.js:511:13)
at tryCatch (/usr/local/lib/node_modules/appium/node_modules/babel-runtime/regenerator/runtime.js:67:40)
at GeneratorFunctionPrototype.invoke as _invoke
at GeneratorFunctionPrototype.prototype.(anonymous function) as next
at GeneratorFunctionPrototype.invoke (/usr/local/lib/node_modules/appium/node_modules/babel-runtime/regenerator/runtime.js:136:37)
[debug] [JSONWP Proxy] Proxying [DELETE /session/1a016856-c0cd-4d59-92fe-315b67bb570d] to [DELETE http://localhost:8100/session/12762F33-B6B3-4B20-A938-432611BF2F2D] with no body
[debug] [JSONWP Proxy] Got response with status 200: "{\n \"value\" : {\n\n },\n \"sessionId\" : \"578AC5DD-C3AE-4D81-8A93-9366ACE947DB\",\n \"status\" : 0\n}"
[XCUITest] Shutting down sub-processes
[XCUITest] Shutting down xcodebuild process (pid 2016)
[XCUITest] xcodebuild exited with code 'null' and signal 'SIGTERM'
[XCUITest] Shutting down iproxy process (pid 2012)
[debug] [XCUITest] iproxy exited with code 'null'
[debug] [XCUITest] Found WDA derived data folder: '/Users/hoperun/Library/Developer/Xcode/DerivedData/WebDriverAgent-brdadhpuduowllgivnnvuygpwhzy'
[XCUITest] Setting '755' permissions to '/Users/hoperun/Library/Developer/Xcode/DerivedData/WebDriverAgent-brdadhpuduowllgivnnvuygpwhzy/Logs/Test/Attachments' folder
[debug] [XCUITest] Not clearing log files. Use clearSystemFiles capability to turn on.
[debug] [iOSLog] Stopping iOS log capture
[MJSONWP] Encountered internal error running command: Error: Could not navigate to webview; there are none!
at XCUITestDriver.spinHandles$ (../../../lib/commands/context.js:511:13)
at tryCatch (/usr/local/lib/node_modules/appium/node_modules/babel-runtime/regenerator/runtime.js:67:40)
at GeneratorFunctionPrototype.invoke as _invoke
at GeneratorFunctionPrototype.prototype.(anonymous function) as next
at GeneratorFunctionPrototype.invoke (/usr/local/lib/node_modules/appium/node_modules/babel-runtime/regenerator/runtime.js:136:37)
[HTTP] <-- POST /wd/hub/session 500 120078 ms - 183

有没有大神遇到过，求指教，小弟这厢有礼啦！