![]() Instead it will stick around and so will be the debugger. If the same app is built against a 4.x SDK then it will not go straight from background to being terminated. Another thing that I noticed while doing this is that applicationWillResignActive: is the only delegate method that I could not optimize into a single box, because one use is to show that the app has been interrupted, the other is to the path into the background.Īn app built with 3.2 will still go through a short background stage where applicationDidEnterBackground: is called. I probably spent an hour trying to fit it all together with no crossing lines. ![]() Multitasking ONĪdding multitasking to this flow chart makes it about twice as complex. This could be the UI to accept a phone call or something as benign as the synching screen. This occurs whenever some other thing is displayed in front of your app. The mechanism with WillResignActive and DidBecomeActive is sort of the Backgrounding Lite that has always been there. In that case the OS will also terminate your app without totally unscrupulous. Not shown on this diagram is the situation that your app is eating up all the system memory and ignores both the level 1 and level 2 memory warnings. So even before 4.0 it would have been smart to put there any kind of code that you want executed whenever the app becomes active, be it after app start or upon rejecting a phone call. ![]() The first thing that I learned from this is that applicationDidBecomeActive: is being called right after application:didFinishLaunchingWithOptions. Then I researched when all these various delegate methods of UIApplication are being called and drew charts to illustrate the flow.īy inhaling first how it was before multitasking and then upgrading your mental process to backgrounding we can begin to fully appreciate how it all fits together. I grabbed the free trial of Omnigraffle and the Non-techie Process Flowchart Stencils by gfraser. There is begins with the ones that have the most memory reserved. It’s only if RAM runs out that the OS starts killing apps. They get put into a sleep mode while the iPhone still has enough memory for everything else. All apps automatically support it because they no longer get terminated if the user pushes the Home button. To gain the possibility for “fast app switching” you actually don’t need to do anything. So an app that would always show fresh content upon launch before 4.0 multitasking would no longer load any new content as soon as you build it for 4.0. That’s actually one of the main reasons why I have not yet had time to update MyAppSales to 4.0. An app that is resumed from standby does no longer go through this delegate method. ![]() That poses a bit of a challenge if you are used to doing things like refreshing images or other files off the internet. A problem that I’m facing frequently when updating a project is that the didFinishLaunching is only called if the app really launches. Now that we all are moving our source code gradually to iOS 4 I had to pause and think a bit about where to move which code. UPDATE: renamed deprecated handleOpenURL to newer name. UPDATE: Added handleOpenURL to the flow charts.
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