I have upgraded to Xcode 9 and appium 1.7.1, webview related tests are broken as appium is unable to locate the elements. Inspectors shows “RemoteViewBridge” for all parent elements and shows nothing for child elements.
To see the elements, try using the simulator iOS to 10.3 (until a fix will come up)
Seems that this issues is from newest iOS 11.0 and above
Open discussion on Apple forums https://forums.developer.apple.com/message/280292
Same issue is coming with 10.3.3 real device.