iOS 4 "Multitasking
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The new feature marketed as "multitasking" in iOS 4.0 was neither new, nor truly multitasking. iOS developer James Jennings explains this paradox and why the result is a net win for the user.
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iOS 4 "Multitasking
- 1. iOS Multitasking is a lie. And that’s totally fine.
- 2. Hi! I’m James Jennings. iPhone Developer james@mobiledistortion.com @jamesjennings
- 3. “Traditional” Multitasking What is it? Multiple programs sharing computer resources
- 4. “Traditional” Multitasking So why are phones special? Limited Resources Processor Battery
- 5. “New!” iOS 4 Multitasking is a lie. It’s not new It’s not multitasking
- 6. “New!” iOS 4 Multitasking Yeah, it’s not new. iOS has always been “Unix-like” Examples Mail sending/receiving iPod App downloading Oh and the phone
- 7. “New!” iOS 4 Multitasking What is referred to as “Multitasking” in Apple’s agitprop is really just: Fast Switching Handful of OS hooks providing limited support for background execution of code
- 9. Fast Switching The “Task Bar” Apps aren’t directly terminated in iOS 4 “Freeze Dried” state information saved
- 10. Fast Switching Apps can opt out Apps can be kicked out App is on Task Bar != App is eligible for fast switching
- 11. Location Tracking 3 Options Normal AGPS Significant Location Changes Region Tracking (iPhone 4 only) App developers must be aware of performance implications
- 12. Audio Background audio, like native iPod Access to player controls
- 13. VoIP App can listen on network for incoming VoIP calls Must use local notification to let user know
- 14. Task Completion App can declare certain blocks of code as critical, which will continue to be executed even after app is terminated Example in pre-iOS4 Mail App can’t run itself indefinitely however, hard time limit enforced App can declare cleanup code if it’s terminated
- 15. Local Notifications Not really part of the “Multitasking” umbrella, available to all iOS 4 devices Utilized by multitasking apps, however
- 16. Summary “Multitasking” has always existed in the technical sense on the iPhone platform The new multitasking in iOS 4 is a specific set of services and hooks Some features are automatic, others must be implemented
- 17. Thank you! Any questions?