如何使用特定时间间隔在后台调用Web服务？

Question

i know that this questions may be repeated some times but i need some clarifications so i asked here.

My requirement is I got location using my iPhone every 20 sec and update my Web Application using the web services.It's also working on Background.

I know that i will got the location in background using the Background Fetch but i little confuse here.I want to update My web database every 20 sec using web services. is it possible to update Web database every 20 second using web service in Application Background mode?

Thanks in advance.

Answer 1

No. Minimal interval when your app "wakes up" in background mode is 6-10 minutes. If your phone is active and unlocked. If your phone is "sleeping", this interval may be some hours.

1. In your project ->capabilities->background modes turn on "background fetch"

2. In your appDelegate

    -(void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler { //Add your code here You will have 30 sec. to do all that you want in background mode completionHandler(UIBackgroundFetchResultNewData); } 

Answer 2

Try to use NSURLSession using its task you can do background upload and download.
After 1st request complete start timer which start the second request.

Good tutorial for NSURLSession is here..

tutsplus (its 4 part tutorial)
Here

And check the NSURLSession document here ..

Its supported in iOS7+. But if user force close the application it will be stopped.