How to Uninstall iOS Apps on the Simulator and Reset Your Device
You uninstall iOS applications on the Simulator the same way you do on the iPad, except you use your mouse instead of your finger. To uninstall an app, just follow these simple steps:
On the Home screen, place the pointer over the icon of the app you want to uninstall and hold down the mouse button until all the app icons start to wiggle.
Click the app icon’s Remove button — the little x that appears in the upper-left corner of the icon — to make the app disappear.
Click the Home button (use Hardware→Home) to stop the other app icons from wiggling and finish the uninstall.
On a separate note, you can always reposition an app’s icon on the Home screen by clicking and dragging it around with the mouse.
You can remove an application from the background the same way you’d do on the iPad, except that you use your mouse instead of your finger. Follow these steps:
Simulate double-tapping the Home buttons with the keyboard equivalent Shift-Command-H twice.
Scroll left and right with the mouse to locate the app you want to stop.
Drag the view of the app up and out of the horizontal scrolling list of apps.
To reset the Simulator to the original factory settings — which also removes all the apps you’ve installed — choose iOS Simulator→Reset Content and Settings, and then click Reset in the warning dialog that appears.
You have some of the basic apps installed on the Simulator — these include Settings. You can use Settings just as you do on an iOS device. This is particularly useful if you want to set an Apple ID for the Simulator to use.
One reason for doing this would be to use the Simulator to test iCloud code in an app you have written. The app on the Simulator will use the Apple ID you have specified in Settings rather than the Apple ID under which you may be running on your app. iCloud on the Simulator is a new feature in iOS 7.