From the project editor
You may encounter issues when using the 4D for iOS project editor or your iOS app.
You can access logs by clicking on "Project" in project editor with Alt key.
From here, a menu will appear for the current simulator:
Open the simulator logs Where you can find the CrashReporter MobileInstallation folder
Open the Simulator Dianostic Reports
Open Current simulator Folder
Open Application Simulator Folder This will open a submenu for each application