I have problem. I need solve this problem for jailbreak iOS. My application works in background mode. I want that application go to foreground mode from background after some events.
I tried next instruction:
system([[NSString stringWithFormat:#"uiopen \"%#\"", #"appname://"] UTF8String])
But application didn't run from background. App run as new process.
Thank you.
User private API:
int SBSLaunchApplicationWithIdentifier(CFStringRef displayIdentifier, Boolean suspended);
It's defined in SpringboardServices private framework.
You will need to add entitlement "com.apple.springboard.launchapplications" for this to work.
Related
I try to let the Watch vibrate from within my code:
WKInterfaceDevice.current().play(.success)
but nothing happens. I also tried to ensure to be on the main thread:
DispatchQueue.main.async {
WKInterfaceDevice.current().play(.success)
}
still nothing. Am I missing something here? I expected it to be an easy task, but I fail completely...
Maybe your watch app is not in the active state? Citing the official documentation:
This method has no effect when called while your shared WKExtension object's applicationState property is either background or inactive. By default, you cannot play haptic feedback in the background. The only exception are apps with an active workout session.
So, unless you have a running HKWorkoutSession, if your app is in background you're not allowed to play haptic.
Alternatively, instead of HKWorkoutSession you could use WKExtendedRuntimeSession to support running the app in the background so sounds and haptics work. This needs to be done using either the Physical therapy or Smart alarm session type.
I'm working on a radio alarm clock, and i have some issues.
I am using local notifications for the alarms, so it has a gentle fallback if the app is not running.
I am well aware of the limitations of the device, and i know what i can and cannot do when the device has gone into background.
But my question is this:
I have seen other apps starting an audio streamer when i've locked the device. How is this possible? May this be inside an execution-timeframe?
How is the best way to implement this? Is it any way i can activate a streaming session when the device is locked?
Edit
To clarify: I know how i make audio play in the background. But the issue is triggering the audio-playback when an local notification or some other event fires.
One app that seems to do this, is Radio Alarm Clock. I haven't tried it for long period of times yet. But it seems to do this. A video demo of the app: http://www.youtube.com/watch?v=KJQiFOcdBWk
Have you already declared your background task?
Support for some types of background execution must be declared in advance by the app that uses them. An app declares support for a service using its Info.plist file. Add the UIBackgroundModes key to your Info.plist file and set its value to an array containing one or more of the following strings:
audio — The app plays audible content to the user while in the background. (This content includes streaming audio or video content using AirPlay.)
iOS App Programming Guide - Implementing Long Running Background Tasks
You can add this by clicking on your main project icon, then under the Info tab you can add "Required Background Modes" to the "Custom iOS Target Properties" section. "App Plays Audio" will be one of the three default values.
Big Edit With New Answer:
If everything else is already in order, you can keep your app running in the background using the UIApplication method
- (UIBackgroundTaskIdentifier)beginBackgroundTaskWithExpirationHandler:(void (^)(void))handler
detailed here: UIApplication Class Reference
with an example here: Hour 21: Building Background-Aware Applications
This allows you to run an instance of NSTimer which triggers your music player. The difference between this approach and UILocalNotifications is that this method never lets the app fully enter the background mode, the music player exists the entire time which subverts the need to create it from the background, which looks to be impossible.
There may be limitations to how long of a timer you can set, I haven't tested this past 14 minutes out.
When press the lock button in app,system will call :
-(void) applicationWillResignActive:(UIApplication *)application and
-(void) applicationDidEnterBackground:(UIApplication *)application
So how can I do to make my app only resignActive but not enter background,and I can run my timer when screen locked(Timer can't execute in background mode).
One method is set the property "Application does not run in background" in .plist to YES,it worked, but my app can never enter background again,however I want it will enter background when press the home button.
Update: I want to play some music in my app at a certain time,just like a music alarm,and I still want it works fine when the screen locked,because keep the screen on may waste a lot of battery,and I don't need to do any thing when user press the home button and exit my app.
Open your Info.plist file and add Application does not run in background. Set value to YES.
Application must have special privileges to do any processing in background such as Audio service/Voip service/Location service.
"I can run my timer when screen locked(Timer can't execute in background mode)"
you cannot run a timer in background which will keep running without using any tentrum and doing so...apple will not accept your application on appstore - that's the worst side if you are targeting appstore...
You can not prevent your app from entering the background. This is decided by the operating system (iOS) and is out of control from applications. However, from reading your updated question, I don't think this is what you need to do.
You can execute background tasks with [UIApplication beginBackgroundTaskWithExpirationHandler;] (see reference). If you want to have something happening after a certain interval, check out [UIApplication scheduleLocalNotification:].
Some services such as VOIP, Audio and CoreLocation are allowed to run in background. Using these for other than their intended purposes (for example, playing silent audio) may risk your app being rejected.
Note that there is nothing you can do to prevent your application from entering the background. It is just that some tasks are allowed to execute in the background. Because of this, you cannot do GUI operations and NSTimers will probably not fire (at least I know some cases where they don't).
It would help knowing what you want to run in the background in order to suggest a solution.
Unless you are playing audio BEFORE the move to background you cannot start audio playback when the app is moved to the background or the screen is locked (which has some weird specifics) suffice to say, its as if you were in the background without actually receiving the applicationDidEnterBackground notification.
The best you can do is schedule a local notification, but in this case your music is limited to 30 seconds and must be part of your application bundle.
I set the audio session category to kAudioSessionCategory_MediaPlayback, I active the session, which returns no errors, and still the iPod music stops when I lock the device. This happens on iOS 5 GM, so I guess this will happen in the final version. On iOS 4+ the current code works fine. Any ideas how to fix this? Huge thanks :)
It's not a bug. To save power locking the phone is now treated as if the user pressed the home button. The fact that applicationMusicPlayer stops now when locking is just a side effect of this change.
To work around this problem you should switch to AVPlayer and make use iOS 4's audio in background mode.
Fixed this issue for my particular problem - how to detect the difference between OS4 and OS5 behavior when device gets to the Lock screen.
In OS4 app does 'applicationWillResignActive' but on OS5 it goes all the way to 'applicationDidEnterBackground' which looks exactly the same as the user hitting the Home button.
It turns out that if you check the UIApplicationState of the application given in '- (void)applicationDidEnterBackground:(UIApplication *)application', it has 3 possible values:
typedef enum {
UIApplicationStateActive,
UIApplicationStateInactive,
UIApplicationStateBackground
} UIApplicationState;
When the user hits home on OS5, you get UIApplicationStateBackground, but when the user hits Lock, you get UIApplicationStateInactive.
Hope that helps.
Happy Holidays everyone.
I need to get the user's location even if the phone goes to sleep/screen lock mode. I've tried enabling location services in background mode by adding key to the info.plist file, but this method requires iOS >= 4.0. Is there any alternate method to get the location manager working in screen lock mode
Yes. Have a look at this:
http://github.com/marcop/iPhoneInsomnia
It keeps the iDevice awake by registering your app as an audioplayer and playing a silent sample every 5 seconds. AFIK, this is the only way to do it in iOS < 4.0.
It seems like a hack, so I don't know what Apple thinks of it, still there are a lot of apps in the AppStore that apparently does this.