Have you checked the data in the stderr logs?
%project_name%/platforms/ios/cordova/console.log
If you are using the ios9 emulator and see a white screen, you may have encountered a problem that ios9 used to use https.
The dirty way is to simply update the xcode configuration configuration to disable ATS
platforms/ios/%project_name%/%project_name%-Info.plist
You can disable Apple Transport protection by adding this to the configuration file
<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>
<key>NSLocationWhenInUseUsageDescription</key>
<string></string>
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