SwiftUI Maps & Location: Fundamentals
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Notes: 15. Challenge: Determine Distance
The student materials have been reviewed and are updated as of January, 2022.
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Determining the distance between two places is something that Core Location provides right out of the box. You just need two things. You need a start location and then you need an end location. And that’s what you’ll be doing in this challenge. Your challenge is calculate the distance from your current location to one of the interesting places. Print out the distance on the location distance UILabel.
Challenge
To do this, you’ll need to get the start location of the user and then when they tap on a location, you’ll need to get the distance from that location. You’ll do this using the distance method on CLLocation. This returns the distance in meters between another location. Once you have your location, you can either use it or do a simple conversion.
Solution
How’d that challenge go for you. If you got stuck, don’t worry about it. Learning an APi takes both time and practice and getting stuck is part of the process. Okay, so open your project from when you last worked on it. Open up the location manager.
var previousLocation: CLLocation?
if previousLocation == nil {
previousLocation = latest
}
else {
let distanceInMeters = previousLocation?.distance(from: latest) ?? 0
}
previousLocation = latest
locationString = "You are \(Int(distanceInMeters)) meters from your start point."