robertmryan / mutedtostandardbug

In iOS 13, switching a map view type from standard to muted does not get reflected correctly

MKMapView Muted-to-Standard Map Type Bug

This is a demonstration of a problem that manifests itself in iOS 13 where changes to a map view type as you go from .standard to .mutedStandard is not reflected in the UI. If you move the map a little (including using userTrackingMode of .follow or manually dragging), the change is suddenly reflected. But if you're not moving the map, the change is not reflected.

You can also force the map view to be re-rendered by either:

• Reset the centerCoordinate of the map view.
• Instead of going directly from .standard to .mutedStandard (or vice versa), change to .satellite first, and it works.

Obviously, both of those are fairly kludgy workarounds for this iOS 13 issue, but they work.

The bug does not manifest itself in the following scenrios:

• Works as expected in iOS 12; only an issue in iOS 13.
• Works as expected when going from .standard/.mutedStandard to .satellite/.hybrid or vice versa; only an issue when going between .standard and .mutedStandard.

The salient code is found in the ViewController.

I’m running Xcode 11.4 (11E146) on Catalina 10.15.4 (19E266) on MacBook Pro (15-inch, 2018). The behavior manifests in both devices and simulators, but in iOS 13 only.

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April 3, 2020

Copyright (c) 2020 Rob Ryan. All Rights Reserved.

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