How to keep an iPhone app running on background fully operational

Question

first of all  I know there is only support for voip  audio and location apps to run in background and that they will run just while the audio is been played or while using location services  etc   What I want to know is if there is a way to keep my app running on background fully operational  doesn t matter the impact on battery s life   That way the user of my app can select from settings to keep alive the app whenever he wants and just for the amount of time he wish  e g if he is waiting for something that requires the app to be running  after receiving the messages he can turn off the keep alive functionality   I don t know if this is possible but I had read some post that say so but unfortunately they didn t say how to      UPDATE   In this tutorial  I found that Acrobits has two apps on the Apple Store that  can force the application to stay alive and awake in the background   So there is a way to do this

User · Answer

Depends what it does  If your app takes up too much memory  or makes calls to functions classes it shouldn t  SpringBoard may terminate it  However  it will most likely be rejected by Apple  as it does not follow their 7 background uses

User · Answer

May be the link will Help bcz u might have to implement the code in Appdelegate in app run in background method     Also consult the developer apple com site for application class  Here is link for runing app in background

User · Answer

For running on stock iOS devices  make your app an audio player recorder or a VOIP app  a legitimate one for submitting to the App store  or a fake one if only for your own use   Even this won t make an app  fully operational  whatever that is  but restricted to limited APIs

User · Answer

You can perform tasks for a limited time after your application is directed to go to the background  but only for the duration provided   Running for longer than this will cause your application to be terminated   See the  Completing a Long-Running Task in the Background  section of the iOS Application Programming Guide for how to go about this   Others have piggybacked on playing audio in the background as a means of staying alive as a background process  but Apple will only accept such an application if the audio playback is a legitimate function   Item 2 16 on Apple s published review guidelines states       Multitasking apps may only use   background services for their intended   purposes  VoIP  audio playback    location  task completion  local   notifications  etc

User · Answer

From ioS 7 onwards  there are newer ways for apps to run in background  Apple now recognizes that apps have to constantly download and process data constantly   Here is the new list of all the apps which can run in background         Apps that play audible content to the user while in the background  such as a music player app   Apps that record audio content while in the background    Apps that keep users informed of their location at all times  such as a navigation app   Apps that support Voice over Internet Protocol  VoIP    Apps that need to download and process new content regularly   Apps that receive regular updates from external accessories      You can declare app s supported background tasks in Info plist using X Code 5   For eg  adding UIBackgroundModes key to your app   s Info plist file and adding a value of  fetch  to the array allows your app to regularly download and processes small amounts of content from the network  You can do the same in the  capabilities  tab of Application properties in XCode 5  attaching a snapshot    You can find more about this in Apple documentation

User · Answer

If any background task runs more than 10 minutes then the task will be suspended and code block specified with beginBackgroundTaskWithExpirationHandler is called to clean up the task                                                              background remaining time can be checked with   UIApplication sharedApplication  backgroundTimeRemaining   Initially when the App is in foreground backgroundTimeRemaining is set to bigger value  When the app goes to background  you can see backgroundTimeRemaining value decreases from 599 XXX   1o minutes   once the backgroundTimeRemaining becomes ZERO  the background task will be suspended             1 Creating iOS Background Task           block UIBackgroundTaskIdentifier background task          background task    application beginBackgroundTaskWithExpirationHandler                       This code block is execute when the application   s                   remaining background time reaches ZERO                          dispatch async dispatch get global queue DISPATCH QUEUE PRIORITY DEFAULT  0                        background task starts                     background task ends                        2 Making background task Asynchronous         if   UIDevice currentDevice  respondsToSelector  selector isMultitaskingSupported                          NSLog   Multitasking Supported                   block UIBackgroundTaskIdentifier background task              background task    application beginBackgroundTaskWithExpirationHandler                        Clean up code  Tell the system that we are done                   application endBackgroundTask  background task                   background task   UIBackgroundTaskInvalid                                Putting All together                 To make the code block asynchronous             dispatch async dispatch get global queue DISPATCH QUEUE PRIORITY DEFAULT  0                             background task starts                 NSLog   Running in the background n                    while TRUE                                        NSLog   Background time Remaining   f    UIApplication sharedApplication  backgroundTimeRemaining                         NSThread sleepForTimeInterval 1     wait for 1 sec                                          background task ends                    Clean up code  Tell the system that we are done                   application endBackgroundTask  background task                   background task   UIBackgroundTaskInvalid                                     else                       NSLog   Multitasking Not Supported

[iphone] How to keep an iPhone app running on background fully operational

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