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Now, let's take a look at multi-tasking, which has received a signifigant revamping in iOS 7. Essentially, multi-tasking is the feature that allows you to switch back and forth among multiple applications. This allows you to do things like start playing games exactly where you left off, leave GPS applications running in the background, or have music apps keep playing music, while you perform other tasks on your device. To invoke the multi-tasking view, double-click the Home button on your device. This shows you all the apps you've been using in order of the most recently used from left to right. Swiping left and right lets you browse between the different apps. Tap any apps icon or its preview to bring it to the foreground and start using it.
One of the nice things about this new multitasking view in iOS 7 is that you can see these previews of the apps in the last state you left them. This gives you the ability to see information in the app without actually bringing it to the front. So, for example, you might have been looking at your schedule in the Calendar app, and then you might want to start composing a text message in reference to one of your appointments. So you could open the multi-tasking view to reference the time of your appointment just by glancing at it in the calendar app's preview. And then you can press the Home button again to stay in the messages app. Pressing the Home button always returns you to whichever app you were in when you open the multi-tasking view.
Now just because in the multi-tasking view you can see all the apps you've been using, this doesn't mean that every single program here is running in the background and eating up processing and battery power. Generally, only the most recently used apps will continue working in the background and that's only if they need to be doing anything at all. Most music apps will continue to play music in the background while you continue to do other things. Most GPS and mapping apps will continue tracking your position while in the background. It depends on how the app was designed and how recently you had it open. Another use for the multi-task bar is for quitting applications.
Occasionally you'll have an app that starts acting funny or not working properly at all. But since current apps are always running, you may have to force it to quit so you can reboot it. To do this just swipe up on the preview of the app, which forces it to quit. You can then try starting up the app again by tapping its icon. Now, I know some people who are obsessive about always quitting every single app. They'll sit there for a minute or two flicking away every app. Often convinced that they're conserving battery power and processing power this way. Now, it's true that many apps continue to work in the background downloading content and performing other tasks.
But most of them have been optimized to do this in a way that has minimal impact on battery life. But if you are concerned about specific apps running in the background, you can go to Settings> General and Background App Refresh. And here at the top you can turn off background refreshing altogether, which means apps won't do anything until they're active on screen, or you can turn specific apps' background refreshing capabilities on and off as you like. So if you have some apps that you know don't particularly need to work in the background, you can turn off their ability to do so from here. So that's how multitasking works in iOS 7.
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