![]() While Apple's built-in apps (like iPod, Mail, etc.) have had background multitasking since iOS 1.0 for iPhone and iOS 3.2 for iPad, with iOS 4.2 it finally comes to 3rd party App Store apps.Īs to how it works, instead of a traditional "leave full apps running in the background" approach, Apple instead chose to implement a more restricted but, they felt, better performing and power friendly solution involving 7 specific background API (application programming interfaces.) And since it's called AirPlay and not AirView, here's hoping Apple also expands the functionality in the future to project game video onto the big TV screen, leaving iPhone and iPod touch as a full on multitouch game controller. Tap one and your video will switch from iPhone to TV. Tap it and you get a list of devices you can stream to. AirPlay compatible apps, when AirPlay compatible devices are present, will show the AirPlay icon as a button. It looks like a TV-style box with a triangle being inserted up into it. You can tell AirPlay is an option when its icon appears to the right of the volume slider. Whether this is intentional or Apple simply ran out of time and didn't finish making public APIs for video is unknown but hopefully this will be expanded upon in a future update. Built-in apps like iPod, Video, and YouTube can stream, but unfortunately it looks like all other apps, including Apple's own Safari and all App Store apps are currently limited to audio-only. AirPlay takes that to the next level, letting you stream video and pictures as well as music from iPad (or iPhone or iPod touch) and the new 2010 Apple TV. AirPlay is an evolution of Apple's AirTunes system that used to let you stream music between iTunes on Windows or Mac and Apple TV or Airport Express connected speakers.
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