August 2012
Beginner
432 pages
9h 39m
English
Content preview from iOS App Development Portable Genius
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Multitasking
Usually, only one app can run at a time. When the user quits an app, it can be reloaded by tapping its icon in the App Switcher. Apple calls this Fast App Switching. The iPad version of the Multitasking bar, which implements Fast App Switching, is shown in Figure 11.1.
A user can remove an app from the Multitasking bar by touching and holding its icon and tapping the “-” (minus) icon that appears. This forces the app to restart from cold the next time the user runs it.
11.1 You can access the App Switcher on any iOS device by quickly clicking the home button twice.
Removing an app from the Multitasking bar deletes it from memory. But you usually don’t need to do this manually. If you launch an app that needs more memory than is available, iOS automatically removes as many non-running apps as it needs to create enough free memory. In practice, the Multitasking bar is a recently used app list—and no more than that. Apps in the list aren’t necessarily using resources. They may not even be in memory.
Apps with selected features can keep running in the background: They keep working behind the scenes while the user works with some other app. In iOS 4 and 5, the features include the following:
Music playback. The app can play iPod files and stream music from online sources. ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.