Can I know which key has pressed when application did enter background? "Home" button or "On/Off" button.
No, there are a variety of reasons your application can enter background, but you just know that the state has changed.
Without using private APIs, there is no way to know for sure. In addition to the user pressing a button, your application can enter the background for auto-lock events, for example, so even the assumption that a button was pressed may be wrong.
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Is there any way to detect if the user has pressed the home button on iOS? Obviously if the app is running normally the app delegate methods gets called, but if the device is locked to an app (through Guided Access or an MDM-server) so the app doesn't quit when you push the home button - is there then any way to know if the user pushed it?
My initial thought was to listen for notifications, but I can't seem to see any generated by pressing the home button.
short:
no not on a stock idevice
longer:
on a stock device your best bet is UIApplicationDidEnterBackgroundNotification (Posted when the app enters the background.)
there is no dedicated way to listen for presses to the home button though, so this won't work for GuidedAccess either
How can I detect Home button long press like 4 second or more event in my app which is already running in background? Is it possible to so because app is already running in background and if user long press home button of the device for 4 second or more can i detect the event in my background running app and if possible than will Apple approve this for app store?
No that is not possible. As you should know, a long press on the home button brings up Siri. Your app would interfere with that. Also, I don't believe Apple allows access to the home button event like that.
Lastly; while your app is in the background, it goes into a suspend state after a short while and no events run. The only thing the app can do is receive push notifications - unless you have been given special access to audio / gps functions from Apple themselves.
Short answer : Not possible. not at least with public method and want your app to be on Appstore.
For the Research purpose, you might want to try use private method and do your R&D with it. it might be possible.
I need a way for my app to know if the home button is pressed, while the app is running in the background. If the home button is pressed, something is gonna be added to a list inside the app. Is that possible somehow?
If your app is in the background, your app wont receive any updates. Furthermore, there isn't any way to hook into the home button click even if your app is in the foreground.
Perhaps there is a private api way to handle this, but your app certainly won't be able to both achieve this goal and be in the Apple App Store. Sorry!
In case you wanted some idea why Apple doesn't allow this, it's because they don't want the home button switch's default behavior to be altered. See this:
10.5 Apps that alter the functions of standard switches, such as the Volume Up/Down and Ring/Silent switches, will be rejected
My app must sometimes show an UIAlertView when the Home button or the locking button is pushed or when the notification center is shown.
I show the Alert from the applicationWillResignActive delegate's method and everything is ok when home button is pushed or when notificacion center is shown. But there is a problem if the button which is pushed is the locking button (on/off button).
In that case, the Alert is not shown when I return to the app (if I used the Home button it is there). I don't do anything else in other AppDelegate methods which are executed. Also, then, when I show a new Alert (any Alert in the app) the Alert which hasn't been shown when I returned is shown after I dismiss the new one.
Please, could anybody help me?
Thanks in advance.
THE EASY, GIVE ME REP ANSWER:
When the app is put into the background, the app is suspended. Part of this process is closing open alert views.
THE I ACTUALLY KNOW WHAT I'M TALKING ABOUT ANSWER:
The logic behind this is that when the user hits the home button when an alert is displayed, they might be going to look for information on how to answer the alert. However, when the sleep button is pressed, the user has stopped using the device altogether. Apple knows that if they unlock thier device again 3 hours later and see something like Confirm Deletion, they will have absolutely no idea what they were just doing and what to do now.
This is known to cause a serious condition known as what-in-the-world-am-I-supposed-to-do-now-itis. Symptoms of this condition include hitting the round button at the bottom of the screen and subsequently holding on your app icon until it jiggles. They then hit the little 'x' button. This is not good for developer's pockets.
I would like to add functionality to my iPad app such that, when the home button is pressed and my app is about to enter the background, a message box pops up requesting a code. Only if the correct code is entered will the application go into the background, otherwise the app will not close.
Is this possible?
Short answer, no it's not possible.