Mastering iOS 11 Programming by Donny Wals

Author:Donny Wals
Language: eng
Format: mobi, epub
Tags: COM060090 - COMPUTERS / Internet / Application Development, COM051370 - COMPUTERS / Programming / Macintosh, COM051460 - COMPUTERS / Programming / Mobile Devices
Publisher: Packt
Published: 2017-10-27T06:03:47+00:00

dataChanged = true

managedObjectContext.persist {

movie.popularity = popularity

group.leave()

}

}

}

}

group.notify(queue: DispatchQueue.main) {

if dataChanged {

completionHandler(.newData)

} else {

completionHandler(.noData)

}

}

}

In order to test whether background fetching is working well, you can build and run your app. Then, add a new movie so you have a movie for which the ID is stored. Finally, you can use the debug menu item in Xcode that's at the top of your screen to simulate a background refresh. This will trigger a background refresh.

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