How can I prevent my app from backgrounding? When I press the home button the app does not seem to close but save its state. Do I have to add some code to - (void)applicationWillTerminate:?
I believe you are referring to preventing the application from Running in the Background?
This is controlled via the application's Info.plist.
Add:
Application does not run in background setting it to YES
or in XML
<key>UIApplicationExitsOnSuspend</key>
<true/>
If you mess around with the home button's functionality Apple will NOT allow your app in the store. I tried to do the same thing but the app got rejected with reason: "The Home button's functionality is absolute and should not be changed without a valid reason.".
Related
In my appname-Info.plist
I have 'Application does not run in background' box checked.(it is ticked)
But when i press the button under the screen to close the app, and then double press the button it shows the list of apps and my app is there among the list of currently running apps. Does this mean that my app is running in the background?
If so is there a fix for this? I'd like to make sure my app is completely dead when user quits it.
Thanks
-Code
Your app is not running in the background after you close it.
Even if you see it in the switcher app list.
Application has different states
Active
InActive
Running in Background
Your application become in-active, not running in background.
Aplications are allaowd to run in the background only for:
Playing music.
Navigation needs.
VOIP (as Skype).
And you should explicitly ask the permission and set the appropriate code for doing that and not only check the 'Application does run in background' in the info.plist
The list you get when you double tap the home button is not a running applications list. That's a common misconception. It's actually a list of recently launched applications. Therefore it makes sense for your app to be in it even if it doesn't multitask.
What does double-tapping on the home button exactly do?
Does it list the applications running in background, OR
Does it list recently used applications?
I've implemented the "Application does not run in background" in my Info.plist file. In spite of this my application shows on double tapping the home button !! Yes I have tried a clean build.
It shows all recently-used apps, not just the multi-tasking ones. If you try to tap your app now, it will start exactly like it was first launched, displaying the launch image first before initializing (calling application:didFinishLaunchingWithOptions: and sending the relevant notifications).
I do not want my app to switch to the "task bar" when the Home button is pressed. That's why I would like it to be closed upon Home press. I added this entry to the info.plist file but this does not change the behaviour:
application does not run in background
(and I checked the box...)
I rebuilt the whole app both in debug and release mode but no way. I heard of another key which should be added to the info.plist but I cannot add it through Xcode:
UIApplicationExitsOnSuspend
What is the right way to do that ?
Regards,
Franz
On iOS 4, multitasking is enabled in Xcode projects by default. This prevents the applicationWillTerminate method from being called. If you do not want to support multitasking, place UIApplicationExitsOnSuspend in your MyAppName-Info.plist file and check the checkbox. If you do want to support it, place any code in the applicationDidEnterBackground delegate method that you want to execute before the application enters an inactive state.
What you're doing will indeed stop the application from running in the background, but you can't prevent it from going to the multitasking bar still. Sorry.
You can manually close the application after home button is pressed. When home button is pressed applicationDidEnterBackground is called. In this delegate just write exit(0) and your application will be ended instantly.
Hallo Everyone,
with the iOS 4, the iPhone is supporting Multitasking, what is very nice, but something I do not wish to support in my Application. I mean, when the user press the Home-button, I want my application to finish and not to enter in Background. With the iOS 4, when the User press the Home-button, the App calls the applicationDidEnterBackground: delegate's method to enter in Background and in order to "force" the Application to finish when the user press the Home button, I've done following implementation:
- (void)applicationDidEnterBackground:(UIApplication *)application {
//save everything...
exit(0);
}
PROBLEM: I've noticed, that exit(0) brings the Application immediately to finish, without calling deallocating methods like "dealloc", and I think that is not a good programming style. So I would like to ask you guys, how to bring the application to finish in a "nicer" way.
Thanks in advance.
What you actually want is not to exit the application (which is as mentioned not allowed), but tell the OS you would rather your application be killed rather than backgrounded.
There is an info.plist key for that, UIApplicationExitsOnSuspend. Set that in your info.plist to TRUE (checked) and then when your app enters the background it will be terminated.
That's two questions:
How to programmatically exit an iPhone app - duplicate
Proper way to exit iPhone application?
How to cause an iPhone app to not go to background in iOS4:
Add the UIApplicationExitsOnSuspend key to your info.plist and set its value to YES
http://developer.apple.com/iphone/library/documentation/General/Reference/InfoPlistKeyReference/Articles/iPhoneOSKeys.html#//apple_ref/doc/uid/TP40009252-SW23
One answer above says "There is an info.plist key for that, UIApplicationExitsOnSuspend. Set that in your info.plist to TRUE (checked) and then when your app enters the background it will be terminated." with Xcode 4, the info.plist value is "Application does not run in background" of type Boolean, so setting this to YES will have the app exit when the user presses the "home" button.
You are not allowed to. I know from experience: got an app rejection from Apple because I've exited (that was two and a half years ago but I doubt they've changed their policy here). There's a "private" (i.e. not mentioned in header file) method "terminate" on UIApplication, IIRC. But Apple says you may not do that. Only thing you can do is to show a dialog, asking the user to press the home button. But in turn doesn't work if on a device with multitasking enabled... so I guess you really have to change your application in such a way that you can throw away your state on applicationDidEnterBackground and start afresh on application on applicationDidBecomeActive.
I am building an iPhone app. Currently when I close the app and relaunch it, it relaunches on the last viewed view. Instead I want to be able to reinitialize the app, and present the view that's most appropriate for the application's state (based on what's in the database).
How can I do that?
You have two options. You can follow Petesh's suggestion to make your app always terminate, or you can implement -applicationWillEnterForeground in your app delegate and reset things there.
I presume it's iOS4 - your app is not being terminated in this case, it is merely being suspended.
You need to follow the instructions here: http://maniacdev.com/2010/07/screw-multi-tasking-how-to-make-your-ios-4-apps-exit-for-real/ which will terminate the app when the user presses the home button.
You need to add the appropriate 'correct view' logic to your application's start-up code once you've done this.
For the purposes of expediency, I'm adding the instructions here:
Open your info.plist file
Add The Key UIApplicationExitsOnSuspend or Select Application does not run in background
Set the new key to YES or Fill in the tick box