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I’m experiencing some very odd behavior with a SwiftUI Map view. Whenever I add an annotation to the Map (in the example a Marker), all of the annotation icons start to ‘twitch’. Almost like they are constantly being re-rendered just one pixel off and jumping back into place. This behavior is seen with ‘all’ annotations not just the custom ones added in the content builder.
This behavior seems to also cause issues with rendering tooltips (using the .help() modifier - they appear and quickly dissapear) and actions (using the .onTap() modifier - clicks sometimes not registered) - although these are not demonstrated in the included sample. These are just things that I have experienced in a larger mapping application.
Although I am using macOS 27 (Xcode 27 beta), the application is being deployed to macOS 26, and the same visual twitching is experienced on those devices.
A very simple example project is attached that demonstrates the issue. Also attached is a zoomed-in screen recording capturing the example project in action.
Submission Date
2026-08-18
Status
Open
Area
MapKit
Operating System Version
macOS 27.0 Seed 5 (26A5406e)
Type
Incorrect/Unexpected Behavior
Description
I’m experiencing some very odd behavior with a SwiftUI Map view. Whenever I add an annotation to the Map (in the example a
Marker), all of the annotation icons start to ‘twitch’. Almost like they are constantly being re-rendered just one pixel off and jumping back into place. This behavior is seen with ‘all’ annotations not just the custom ones added in the content builder.This behavior seems to also cause issues with rendering tooltips (using the
.help()modifier - they appear and quickly dissapear) and actions (using the.onTap()modifier - clicks sometimes not registered) - although these are not demonstrated in the included sample. These are just things that I have experienced in a larger mapping application.Although I am using macOS 27 (Xcode 27 beta), the application is being deployed to macOS 26, and the same visual twitching is experienced on those devices.
A very simple example project is attached that demonstrates the issue. Also attached is a zoomed-in screen recording capturing the example project in action.
AnnotationExample.zip
AnnotationRendingIssue.mov
Keywords
SwiftUI, Map, MapContent, MapKit
Prerequisites
FB<number>: <title>