iOS development easy to implement background tasks (such as background play music, timers, background positioning, etc.)

Source: Internet
Author: User
Tags set background vars

The maximum length of time to run, not to challenge the limit, how long it takes to keep the test.

Note: Test with a real machine

Directly on the code

In the Appdelegate. m, add some code actions when you enter the background

  1. /**
  2. * Called when the app enters the background
  3. */
  4. -(void) Applicationdidenterbackground: (uiapplication *) application
  5. {
  6. /** 
  7. * Status of App
  8. * 1. Death Status: No app opened
  9. * 2. Foreground operation status
  10. * 3. Background suspend state: Stop all animations, timers, multimedia, networking operations, it is difficult to do other operations
  11. * 4. Background running status
  12. */
  13. //to the operating system to apply for background running qualification, how long can be maintained, is uncertain
  14. Self.task = [Application beginbackgroundtaskwithexpirationhandler:^{
  15. When the background run time for the application has ended (expired), the block is called
  16. //
  17. Finish the mission.
  18. [Application EndBackgroundTask:self.task];
  19. //    }];
  20. __block uibackgroundtaskidentifier task = [Application beginbackgroundtaskwithexpirationhandler:^{
  21. //When the background run time of the application has ended (expired), the block will be called
  22. //Hurry to finish the task
  23. [Application Endbackgroundtask:task];
  24. }];
  25. /** 
  26. 1. Defining Variables Uibackgroundtaskidentifier Task
  27. 2. Execute the code on the right
  28. [Application beginbackgroundtaskwithexpirationhandler:^{
  29. When the background run time for the application has ended (expired), the block is called
  30. Finish the mission.
  31. [Application Endbackgroundtask:task];
  32. }];
  33. 3. Assign the return value of the right method to a task
  34. */
  35. //Set background mode in INFO.PLST: Required background modes = = APP plays audio or streams audio/video using AirPlay
  36. //engage in a 0kb MP3 file with no sound
  37. //Loop playback
  38. //Previous background mode has only 3 kinds
  39. //Maintain network connectivity
  40. //Multimedia Applications
  41. //VOIP: Internet telephony
  42. }

iOS development easy to implement background tasks (such as background play music, timers, background positioning, etc.)

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