Background App Refresh Ios Objective C

When your app moves to the background the system calls your app delegate s application did enter background method. For tasks that require more background time use background tasks. Background app refresh or simply background fetch has been around since ios 7 which lets your app run periodically in the background so that it can update its content.

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Call the set minimum background fetch interval method of uiapplication at launch time.

Background app refresh ios objective c. If your app s server based content changes infrequently or at irregular intervals you can use background notifications to notify your app when new content becomes available. Extending your app s background execution time ensures that you have adequate time to perform critical tasks. Enable the background fetch capability in your app.

Next we need to enable background fetch. Use app refresh tasks for updating your app with small bits of information such as the latest stock values. To support background app refresh for your app do the following.

Background app refresh is a new feature added to ios 7. Some of the built in apple apps such as mail contacts and the calendar have always done this. A background notification is a remote notification that doesn t display an alert play a sound or badge your app s icon.

Downloading data in the background before it is needed minimizes the lag time in displaying that data when the user launches the app. When a new email arrives you open the app and the email is there. The system uses the elapsed time to calculate power usage and data costs for your app s background downloads.

If your app takes a long time to call the completion handler it may be given fewer future opportunities to fetch data in the. For apps supporting ios 13 and higher use bgapp refresh task. That method has five seconds to perform any tasks and return.

First of all we have to add background modes capability in the project settings. Let s implement a background app refresh for the sample app. What it does is allows apps to quietly wake up and download content all while in the background.