I am currently using Xcode 8.3.3 and if I'm using a UIWebView I am getting this error you can see down below and then in some projects or some times the WebView doesn't work and in others it does. I already testet it with an empty project and yes it is the UIWebView that is causing these issues.
objc[11182]: Class PLBuildVersion is implemented in both /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/AssetsLibraryServices.framework/AssetsLibraryServices (0x11df63cc0) and /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/PhotoLibraryServices.framework/PhotoLibraryServices (0x11dd7a6f0). One of the two will be used. Which one is undefined.
Thanks in Advance :)
Edit: also using WKWebView doesn't changed anything. Got still the same issue.