Learn iOS 11 Programming with Swift 4 Second Edition by Craig Clayton

Author:Craig Clayton
Language: eng
Format: epub
Tags: COM051370 - COMPUTERS / Programming / Macintosh, COM051460 - COMPUTERS / Programming / Mobile Devices, COM051390 - COMPUTERS / Programming / Open Source
Publisher: Packt
Published: 2018-01-30T10:43:22+00:00

func currentRegion(latDelta:CLLocationDegrees, longDelta:CLLocationDegrees) -> MKCoordinateRegion {

Part B: This guard statement obtains the first item in the array. If there are no items in the array, it will just return an empty coordinate region. If there are items in the array, it will return the coordinate region:

guard let item = items.first else { return MKCoordinateRegion() }

Part C: Here, we are creating an MKCoordinate with the latitude and longitude that we passed into the function. MKCoordinateSpan defines a span, in the latitude and longitude directions, to show on the map:

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