CODEWITHSUNDEEP
iphonedelegatesexit
jcdmb
jcdmb

Reputation: 3056

iPhone: What is the correct way to leave an Application?

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.

Upvotes: 1

Views: 982

Answers (4)

harry
harry

Reputation: 338

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.

Upvotes: 1

Kendall Helmstetter Gelner
Kendall Helmstetter Gelner

Reputation: 75058

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.

Upvotes: 4

user123444555621
user123444555621

Reputation: 152986

That's two questions:

  1. How to programmatically exit an iPhone app - duplicate

    Proper way to exit iPhone application?

  2. 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

Upvotes: 2

DarkDust
DarkDust

Reputation: 92335

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.

Upvotes: 0

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