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When we delete all the apps open and reset the unit, the apps still in memory.
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Actually there is no real multi-tasking in iOS. When you switch to another App the current one goes in the background and enters a suspended state. Basically they are Foreground active > Background > Suspended, and that happens within seconds. Depending on what else you have open or are using ‘now’ iOS may also unload the App from it’s memory to free that up.
The reason for this misunderstanding is an incorrect understanding of how multitasking works on iOS. By default, apps automatically suspend when they go into the background. So, when you leave a game you’re playing by hitting the Home button, iOS keeps that game’s data in RAM so you can quickly go back to it. However, that game isn’t using CPU resources and draining the battery when you’re away from it. It’s not actually running in the background when you’re not using it.
When you use an application on your desktop PC — Windows, Mac, or Linux — or open a web page in your web browser, that code continues running in the background. You may want to close desktop programs and browser tabs you’re not using, but this doesn’t apply to iOS apps.
When you double tap the home button, it takes you out of the app you were in, and it shows you a fullscreen thumbnail preview of the app you were most recently in, as well the rest of your recent applications.
you double-click your device’s Home button to zoom out into a card-based interface, which shows you the app screens themselves (as they were when you last viewed them)
The multitasking bar is nothing more than a glorified reference tool for the user to switch between recently-opened apps. The proof is that you can reboot your iPhone and still have all of your recently-opened apps in the multitasking bar.
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