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MapKit Tutorial: Overlay Views

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1

Learn how to add satellite and hybrid maps, custom images, annotations, lines, boundaries and circles to the standard map using MapKit Overlay Views.

This is a companion discussion topic for the original entry at https://www.raywenderlich.com/425-mapkit-tutorial-overlay-views
2

Sorry if this is a noob question…any idea why I’m getting the error ‘Return from initializer without initializing all stored properties – self.boundary not initialized’ in the Park class? I had the .map closure in there (even copied and pasted from the tutorial thinking I missed something), and also tried replacing it with a loop like in the original tutorial like this:

let cgPoints = boundaryPoints.map { CGPointFromString($0) }
        var boundaryTmp: [CLLocationCoordinate2D] = []
        for i in 0...cgPoints.count - 1 {
            let j = CLLocationCoordinate2DMake(CLLocationDegrees(cgPoints[i].x), CLLocationDegrees(cgPoints[i].y))
            boundaryTmp.append(j)
        }
        self.boundary = boundaryTmp

Thanks!

3

@owenb Could you please help with this when you get a chance? Thank you - much appreciated! :]

4

You probably forgot to give the ivar an initial value…

var boundary: [CLLocationCoordinate2D] = []

1 Like
5

I agree with lars, be sure boundary is initialized in its declaration, or if you prefer, initialize it in init().

6

@lars @owenb Thanks guys! What a simple thing I overlooked. Looking forward to finishing this today. Great post!

7

Did anyone do a technical edit of this posting?

mapView.mapType = MKMapType.init(rawValue: UInt(sender.selectedSegmentIndex)) ?? .standard

You should definitely not be calling .init directly like that at all.

8

It should be noted that there are some major performance issues that are reflected when using MapKit on the Xcode 9 betas (sims) as seen here. It may be a good call to call this out in the above posting as the region is rarely, if at all, set and animated.

9

MKOverlayRenderer also inherits from NSObject. It has no direct association to a UIView. I’m not quite sure why the subclass doesn’t indicate this an why it’s referenced as being a UIView child. A renderer != a view.

10

Should likely remove the ; after break;

13

This tutorial is more than six months old so questions are no longer supported at the moment for it. Thank you!