How do I diagnose and fix 'App installation failed on device' in Swift/Xcode?

Diagnosing and fixing the 'App installation failed on device' error in Swift/Xcode can be a straightforward process if you follow these steps:

Check Device Compatibility: Ensure that your device is compatible with the app's deployment target set in Xcode.
Confirm Xcode and iOS Version: Use the latest version of Xcode and ensure your device has the corresponding iOS version.
Clean Build Folder: Use the shortcut Shift + Command + K to clean the build folder and eliminate any corrupted build artifacts.
Check for Certificates and Provisioning Profiles: Ensure that your codesigning settings are correct and that the appropriate profiles are installed.
Delete Old Versions: Remove any old versions of the app from the device. Sometimes, conflicts with previous installations can cause issues.
Check Device Storage: Ensure that there's enough available storage on the device for the app to install.
Review Console Logs: Use the Xcode console and check device logs for more information on the error.
Restart Your Device and Xcode: Sometimes, a simple restart can resolve temporary issues that may hinder the installation.

By following these steps, you should be able to identify and resolve the 'App installation failed on device' error effectively.