I need to close some resources I am using when the App is minimized by clicking on Home Button.
Attention, I don't want to intercept the Home button, I know it is not allowed by Apple
thanks
Use the delegate method - (void)applicationDidEnterBackground:(UIApplication *)application which is in appdelegate class. Whenever user taps the home button, this method will be called. for more details, check apple documentation. You can use applicationWillResignActive: in case you want to detect an incoming phone call or sms as well along with app minimizing.
You want to look at the UIApplicationDelegate (reference). Specifically, applicationWillResignActive and applicationDidEnterBackground should be what you want.
From the Apple docs, this also goes into more detail with examples - App States and Multitasking.
Related
Could you tell me if there is any possibility to add own function to terminate application event. I want to send some information to logs always when user click button on his phone.
See the documentation for applicationDidEnterBackground: in the UIApplicationDelegate class description. (Since iOS 4, the default behavior when the button is pressed is not termination...though your app may choose differently.)
You can call your own method from - (void)applicationDidEnterBackground:(UIApplication *)application
Check out developer documentation for detailed info - http://developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/UIApplicationDelegate_Protocol/Reference/Reference.html
One point to not here as mention in docs -
"Your implementation of this method has approximately five seconds to perform any tasks and return."
Is there a way to make a difference between the user tapping the home button twice and the user locking the screen? I know that in both cases the app delegate's method applicationWillResignActive: is called, but I'd like to able to tell exactly which event has happened. Any method to do that? Thank you!
From looking at UIApplicationDelegate Protocol Reference:
applicationWillResignActive:
// Then when its back, this gets called:
applicationDidBecomeActive:
are the only methods that gets called in this situation. So unfortunately, the answer is no, there is no way to tell the difference between locking the device, and double clicking the home button.
Doesn't appear to be a way in a app store app. You can probably do this with private methods.
I attempted to observe these changes, but the home store double press doesn't modify your frame or window data (like say the phone call status does). So you wouldn't be able to tell when you have been moved up to show the home button bar thru observation.
I'd like my app to do an animation just before close, exactly like the official Camera app from Apple, that "closes the shutter" before closing itself. Is is possible or is this a private and undocumented API?
Thank you in advance!
There is no official way for your app to delay its closing after the user taps the home button. Apple wants users to be able to quit out of apps quickly and at anytime. However, you do get notified when your app is closing, and you do get a chance to run some code. I can't tell you for sure of any UI stuff would work, but the spot to try it is in your UIApplicationDelegate (AppDelegate) class. The methods you're interested in are:
- (void)applicationWillResignActive:(UIApplication *)application {
// Try some UI stuff here
}
Or:
- (void)applicationDidEnterBackground:(UIApplication *)application {
}
I'm assuming the UI will change as the app window is animating away. Let us know if it works!
I am wanting to save some app state data for when the user is quitting the app. I am thinking that I should be using the applicationWillTerminate method inside of my appDelegate, but when I try and do anything there, it's not doing anything:
- (void) applicationWillTerminate:(UIApplication *)application {
NSLog(#"test");
}
When I run my app, and do some stuff, and hit the home button to quit the app, nothing comes over the console...
Do I have to implement the applicationWillTerminate method in the appDelegate? The user of my app will most likely be in a Reader view when they leave, is there anyway to implement the app will close method there?
see this link iPhone simulator and applicationWillTerminate() for older iOS versions;
but remember the Home button does not necessarily terminate the application is ios4... you should use applicationDidEnterBackground but would suggest both places applicationWillTerminate and applicationDidEnterBackground
Adding the UIApplicationExitsOnSuspend key to your application’s Info.plist file and setting its value to YES will make you application quit when you hit the home button, even on iOS4
In iOS 4, the applicationWillTerminate: method is only called if you opt out of the background execution model. In the standard iOS 4 application lifecycle, applications are suspended (not terminated) when the home button is pressed. Your application delegate will receive an applicationWillResignActive: message followed by an applicationDidEnterBackground: message. The applicationDidEnterBackground: method is a good place to save user data.
Is it possible to logout when the iPhone Home button is pressed?
In the current iPhone API, it is impossible to "hijack" any of the hardware presses. You will be notified of certain events however. If you are wishing to call some function (logout) when the user exits the app by pressing the home button, you can implement the
- (void)applicationWillTerminate:(UIApplication *)application {
....
}
method in your Application Delegate. This method is called when the app is about to terminate through a phone-call, manual exit, or any other reason. You should be advised, however, that anything here better be very short execution and non-essential, as Apple does not guarantee that it will run through the whole method before terminating the application
For iOS 4.0 + however you will have to implement logout in this method as well
- (void)applicationDidEnterBackground:(UIApplication *)application