xcode will continue when iPhone

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There are multiple solutions for this:

Solution 1: Patiently wait for 10 to 15 minutes. Have a tea or roam around ;-)

Solution 2: Disconnect device from the system. Restart both iPhone and Xcode and then rebuild again.

Solution 3:

1. Go to Windows → Devices and Simulators (Shortcut key: cmd+shift+2)
2. You’ll see iPhone device connected to system with message

   iPhone is busy: Preparing debugger support for iPhone

3. Click on plus button (+) present in bottom-left corner.
4. This will show the device connected to system. Click on Next button.
5. Thereafter you’ll see ‘device setup was successful’. Click on Done button.