Add anchorPoint to ViewMapAnnotation
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darronschall
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This uses `anchorPoint` from `UIView` when available (iOS 16+), otherwise it relies on `MKAnnotationView` `centerOffset` and converts the `anchorPoint` percentages into pixel values.
After applying the frame fix in the previous commit, the annotations displayed on the map with a white background. This brings back the clear background they previously had.
`UnitPoint` - https://developer.apple.com/documentation/swiftui/unitpoint - is more SwiftUI-y than `CGPoint`, and will allow the anchorPoint to use the constants like `.center` and `.bottom`. Extract extensions to make it trivial to convert the `UnitPoint` to a `centerOffset` within a rect, and to convert back to a `CGPoint` for the `UIView` `anchorPoint` property.
The `#available(iOS 16)` wasn't preventing the `anchorPoint` from being set, but that is only available on `UIView`, not `NSView`. Ensuring `UIKit` is available fixes the error, and we fall back to `centerOffset` otherwise.
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NOTE: This builds on #48, since I also needed those attributes to help control how my markers cluster. If #48 gets merged first, this PR will be slightly easier to review.
I originally tried just adding
anchorPointtoViewMapAnnotationand passing it through to theMKMapAnnotationView(usingUIView'sanchorPointif available, otherwise falling back oncenterOffset), but the anchor point wasn't applying correctly.I borrowed from @allenhumphreys PR #40 to get the frame and the anchor point to apply correctly. I wasn't sure if that PR was ever going to get merged; I took the minimum changes necessary to get anchor point working in hopes of getting this PR merged.
I also looked at ideas in #38, which seems somewhat related. This could potentially fix #14 as well; I've noticed that my pins have a much more consistent location now during zoom/pan and seem to be anchored properly in the correct location.
My first pass made anchorPoint a
CGPoint, but I decided it would be better to useUnitPointas that's more SwiftUI-y. I can change it back toCGPointif you prefer.FWIW, I'm using this branch successfully in an iOS app, and I have pin-style markers. Setting
anchorPoint: .bottom(the bottom middle of the marker) keeps the pins in the correct location as the user moves the map around in my app.