Is there a way to check if the phone is locked? Or do I receive a notification of the phone is going to be locked?
My app runs in the background, continues to play audio, so applicationWillResignActive: isn't really what I am looking for.
Checkout UIApplicationProtectedDataWillBecomeUnavailable. This appears to be called when the device is locked. iOS4 + only.
UIApplicationProtectedDataWillBecomeUnavailable
http://developer.apple.com/library/ios/#documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/AdvancedAppTricks/AdvancedAppTricks.html
You can't, directly. Indirectly, you can watch for accelerometer on/off notifications.
Why do you want to detect this event in the first place?
Related
How I can programmatically make the notification appear only on the apple watch and only when the event occurs. I searched for a long time on the Internet and in the documentation but did not find the answer
There is no way for you to decide whether the notification appears on the Watch or on the Phone, the system handles this automatically and you cannot change this behaviour.
The notification only appears on the Watch if all of the below requirements are met:
The connected iPhone's screen is locked
The watch is worn by the user in case WristDetection is turned on
Do not disturb mode is turned off on the Watch
My app is running in the background and must know when the device has been unlocked, in order to resume some important operations. The user relys on it still working even after the app enters background or the device gets locked and unlocked again.
Someone suggested using UILocalNotification to notify the app but I don't see how? Also I want no dialogue to prompt the user with some question. App just has to perform a quick operation upon unlock.
http://developer.apple.com/library/ios/#documentation/uikit/reference/UIApplicationDelegate_Protocol/Reference/Reference.html
UIApplicationWillResignActiveNotification
A bit more accurately, applicationWillResignActive gets called when the app moves to the background, not only due to screen lock.
Following methods will be used when device unlocks/lock -
When device locks - applicationWillResignActive:
When divide unlocks - applicationDidBecomeActive:
In these method we can use UILocalNotification to perform some task as per our need.
I am new in iPhone programming. so please tell me Can we get the notification when the phone rings and answer the Phone? If Yes then How?anybody help me.
If an iOS app is in the foreground and has set an audio interrupt handler in the app's Audio Session setup, then that handler will get called when the phone rings. If the call is accepted, then the app will be notified that it is being sent to the background. If not, then the audio session handler will be called again to allow the app's audio to be restarted. If an app is not running in the foreground, or does not have an active audio session, it is not possible to get any notification.
I'm a bit confused.
It says on many places, that on IOS you can't make your app work if the phone enters standby mode unless you use push notifications.
I did encounter some apps that do succeed this in IPhone 4
(such as ihandy alarm clock http://www.ihandysoft.com/alarm_clock.html)
It even beeped on standby when I was in airplane mode!
Can someone straighten my thought regarding this issue?
There are two kinds of notification in iOS: push notification and local notification.
In your case, the app beeps while airplane mode is on, it might use local notification rather than push notification.
According to http://developer.apple.com/library/ios/#documentation/iphone/conceptual/iphoneosprogrammingguide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html, “Apps that receive regular updates from external accessories” can continue to run in the background.
Let's say the user leaves the phone on the table. (probably on home screen)
A few hours later, he picks it up. And when it does, the iPhone detects the accelerometer, and it rings.
Unfortunately, this is not possible. Once the OS goes to the home screen, applications running in the background have a limited set of options.
Read this article for more information: http://developer.apple.com/library/ios/#DOCUMENTATION/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html
Not through officially accepted means (i.e. you could do it on a jailbroken phone conceivably). Primarily, you can't run in the background for that purpose. If the app was running in the foreground, you can easily detect motion and perform an activity - but if the phone is left for too long a period without activity, it will sleep.
Unfortunately, the accelerometer is not one of the specified keys in the UIBackgroundModes option in your apps info.plist.
auido, location and voip are the only ones available for now.
short answer: YES
The trick is to make sure the app doesn't get backgrounded when the phone goes to sleep. The other elements like detecting changes in the accelerometer and playing a sound are all standard features.
As for the no sleep solution, it has been asked before, basically is you play a music sample the app will continue running, so perhaps a loop of silence continuously played.
Only if you left an app designed for that purpose running in the foreground.
It won't be possible if your app is running in the background.