I have an iOS app and for several reasons I need to close it when the user clicks the home button of the device. I can't support background.
I now there is an option called Application does not run in background, but I can't use it because there is a bug from Facebook sdk that makes impossible to authenticate with Facebook when this option is in use. Here is the bug report at Facebook.
So I don't know what to do, how can I restart it? An [[NSThread mainThread] exit] in applicationDidEnterBackground?
Is there a workaround for this?
The legal (Apple will approve the app) way is set or create the key UIApplicationExitsOnSuspend to YES in the Info.plist.
To get this as action you would need exit(0) or [[NSThread mainThread] exit], but this is against the Human Interface Guidelines from Apple
So what you could also do is just design all your views in a manner that they have a reset function . Then when applicationDidEnterBackground store that you need to reset on next startup or directly call reset on all active views in applicationWillEnterBackground
So your App didn't really restart, but all your views look like this. To give you an advice, I would design my app in a manner that it doesn't shutdown itself when i quit. This is no good user experience.. Once clicked the home button and all your data is away, same when you receive a call.
Plain old stdlib.h exit() will terminate the app, though it violates apple guidelines (see "Don't Quit Programmatically").
Your app won't perform any background actions if you don't initiate any.
Related
So, I have an app that monitors significant location changes. I want to only record changes at most every 2 hours. The other times, I really don't want my app to startup at all. Does anyone know if I can terminate my app from within
- (BOOL) application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
Will returning "False" cause my app not to be loaded (from the docs it seems that is only if it is trying to handle a URL).
You should not terminate the app as it lead to rejection by apple.As docs say
There is no API provided for gracefully terminating an iOS application.
You can show pop up to user for appropriate message.During development or testing you can call abort().But you should not ship your app with any of terminate api as apple strongly discourage this.
you can try exit(0); but Let me warn you apple may reject your app if you terminate your app willingly, what would be better is to show a dialogue box containing the reason and asking the user to close the app on thier own.
You really should not terminate your application, but should prompt the user that there's nothing to show at the moment and have them go to the home screen.
However, if you really want to, you can use abort().
From Apple's Developer Library (emphasis added):
In iOS, the user presses the Home button to close applications. Should your application have conditions in which it cannot provide its intended function, the recommended approach is to display an alert for the user that indicates the nature of the problem and possible actions the user could take — turning on WiFi, enabling Location Services, etc. Allow the user to terminate the application at their own discretion.
[...]
If during development or testing it is necessary to terminate your application, the abort function, or assert macro is recommended.
I have a application running in background and I need to know if device is sleeping in order to start a sincronisation process, but I didn't find information about this.
Does anyone know if it is posible and how do it?
Thanks.
You cannot know if the device is asleep because you have no control over the OS.
You can, otherwise, use the App Delegate method:
- (void)applicationWillResignActive:(UIApplication *)application
{
//your code goes here
}
if you want to wait till your app goes to background
I believe you can't do this using public API. The only thing which you can check whether your application is active or in background (using AppDelegate callbacks). And as Luke pointed out in comments, checking whether device "falls asleep" isn't iOS best design practice.
There are some private API's to do what you want, you can look at following questions:
Is there a way to check if the iOS device is locked/unlocked?
Detect screen on/off from iOS service
However, you should be aware that your app won't be accepted in AppStore in such case.
I want to exit my application programatically, I googled, some people suggesting to use exit(1), but apple is not supporting that I guess. If it is the case, How do I exit my application programatically. Any helps appreciated.
exit(0); will work but don't use it
You shouldn't force close an app as the standard way to terminate an application is to press the home button (or use the multitasking bar)
Don’t Quit Programmatically
Never quit an iOS application programmatically because people tend to
interpret this as a crash. However, if external circumstances prevent
your application from functioning as intended, you need to tell your
users about the situation and explain what they can do about it.
Depending on how severe the application malfunction is, you have two
choices.
Display an attractive screen that describes the problem and suggests a
correction. A screen provides feedback that reassures users that
there’s nothing wrong with your application. It puts users in control,
letting them decide whether they want to take corrective action and
continue using your application or press the Home button and open a
different application
If only some of your application's features are not working, display
either a screen or an alert when people activate the feature. Display
the alert only when people try to access the feature that isn’t
functioning.
Source
I believe u are not reading the comment properly thus posting the answer for ur question here:
"Simply Don't do that. as apple does not allow application to crash like that."
look at here. How do I exit my iOS app gracefully after handling a Local Notification and here Exit application in iOS 4.0 there are fare discussion over here.
After the release of iOS4, multitasking(new feature) was added by APPLE. This feature enabled the users to keep the app into suspended state in the background if in between he has to do some other activity(e.g. picking up phone call). So Apple considers your app should be maintained in the background until the user deletes the application from the background. And after this if you want to exit use exit(0);, using this would further lead to rejection from AppStore
Here's a wrong way to accomplished exit function in your app. This is coming to mind when I read your question, never applied anywhere, so be careful if you'll gonna implement this!
- (void) exitApp
{
NSArray *array = [[[NSArray alloc] init] autorelease];
NSLog(#"%#",[array objectAtIndex:10]); //will crash here, looks like exit.
}
P.S. You can put this code inside your UIAlertView asking exit confirmation like Do you really want to exit?. In YES button pressed you can call [self exitApp]; User think that he'll exit from the app.
How programmatically restart an iPhone app in iOS?
I find this way http://writeitstudios.com/david/?p=54
But may be something simple.
The only way I know to do this is not ideal, but it works.
First, your app has to opt out of background execution (multitasking) The app has to quit when exited, not run as a background task. This is done with the plist key UIApplicationExitsOnSuspend.
Second, your app needs to register a custom URL scheme that can be used to launch the app.
Third, you need a web page hosted somewhere that when loaded will redirect to your app's custom URL scheme.
Forth, the user needs an active Internet connection.
To exit and restart, call UIApplication openURL on your hosted redirecting web page. Your app will exit and safari will launch and load your page. The page will redirect Safari to your custom URL scheme, prompting Safari to internally call openURL, causing iOS to launch your app.
my post that you linked to is referring to a Cocoa Application, not the iOS. On the iOS, you can quit an application (but Apple doesn't like this) by using exit(0); but I don't recommend that. You cannot restart iPhone apps though.
Unless you're developing for jailbroken devices, Apple won't even allow you to programatically terminate your app. So restarting the device is out of the question.
Your AppDelegate instance has a method
(void)applicationDidBecomeActive:(UIApplication *)application
{
}
In here, you can put logic to figure out if the app should restart, or continue doing whatever it was doing. For example you can have a BOOL variable appMustRestart that is false at first but gets triggered as true whenever something happens in your app that you'd like the next time to be a fresh relaunch.
if (appMustRestart)
{
[self resetVars]; // call a method that resets all your vars to initial settings
// INSERT CODE HERE TO TRANSFER FOCUS TO INITIAL VIEWCONTROLLER
}
I am developing an iPhone application which is completely based on web data.
If it is not connected to the internet, the application is of no use.
So, I want to terminate the application when connection is not found.
NSURL *tmpURl=[NSURL URLWithString:[NSString stringWithFormat:#"%#search.php",[iGolfAppDelegate getServerPath]]];
NSMutableURLRequest *theRequest=[NSMutableURLRequest requestWithURL:tmpURl];
con=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if(con){
myWebData=[[NSMutableData data] retain];
} else {
//Yes I will provide two buttons on alertview "retry" & "close", & when user
//taps on "close" => application should terminate.
// i will send alertview & when user taps on button close then
// what to write for terminating application?
// Ok Ok. Don't terminate. User will terminate.
// user is owner of iPhone
// let him choose what to do
// wait till wifi connects
}
The question is how to terminate the application?
Is exit(0) only the option for terminating application or is there any other option available?
Apple is is absolutely clear about this topic:
There is no API provided for
gracefully terminating an iPhone
application. Under the iPhone OS, the
user presses the Home button to close
applications. Should your application
have conditions in which it cannot
provide its intended function, the
recommended approach is to display an
alert for the user that indicates the
nature of the problem and possible
actions the user could take - turning
on WiFi, enabling Location Services,
etc. Allow the user to terminate the
application at their own discretion.
See Technical Q&A QA1561
You might consider informing the user that they cannot use your application without an active network connection. Just terminating the application outright seems like a very unfriendly way of doing this; the user will simply see the app "disappear".
Every well-behaved app I've seen will at least give a notification before terminating.
I would advise you to reconsider for 3 reasons
It may appear that your app crashed.
The user may get an internet connection while your app is up. In this case a 'Retry' would be best.
I think Apple may actually not accept the app if it does that. It is for sure not what they would do if an Apple application needed an internet connection, and they do test to see what an app will do without a connection.
If (for whatever reason)you do want to do it you can use.
exit(0);
You could always just divide by zero. As a bonus, the implementation would reflect what a good idea this is.
Hope this helpful
[[NSThread mainThread] exit];
If you terminate it will look like your app has crashed!
Best to put up a message saying that there is no internet connection and give them an option to retry (in case they can get an internet connection), or choose to quite it themselves
You shouldn't do this. Take a look at "Stopping" in the Human Interface Guidelines as you could possibly fail for submitting an App that does this, or at the very least provide for a strange user experience.
The link also shows the correct way to handle this, as in the iTunes Music Store app.
Your App will be rejected if you terminate when you cannot reach the Internet.
Sorry.
-t