Shut down iPhone in simulator

Yes. Press Command+Q to quit the simulator.

This will close all the apps running in the simulator.

Pressing the home button only returns to the home screen without quitting the apps(ios 4 or later) because of multitasking.

You can also double tap the home button, click and hold on the icons at the bottom of the screen till a red circle appear, and click on the red circle to close the running app.

If your'e xcode 9.You can now shutdown the simulator by long-pressing the power button.

As of XCode 9, the best way to close a single simulator is using the Cmd + W shortcut, or going to File -> Close Window.