Issue with Heart Rate Graph from Apple Watch in iOS App Hello Community! I hope everyone is doing well. I'm developing an iOS app that includes a feature to display a graph of the heart rate recorded during a route using the Apple Watch. Current Implementation I have successfully implemented data collection and transfer from the Apple Watch to the iPhone. The app's main UI correctly displays the user's real-time BPM. When the user stops the route, an analysis view is generated, showing speed and altitude (both work perfectly). Expected Behavior The user starts recording a route while monitoring heart rate. After tapping "Stop Route," an analysis view should display a heart rate graph along with speed and altitude data. Issue Encountered Despite multiple attempts, I have not been able to properly generate the heart rate graph. The only result I have achieved so far is a flat line with points representing the recorded BPM over time, instead of a proper graph. Request for Help If anyone has experience implementing a similar feature, I would appreciate any guidance on correcting my implementation. I can share: The file responsible for graph visualization. The file handling data processing after the user stops the route. Any help or suggestions would be greatly appreciated! Summary I'm trying to display a heart rate graph from Apple Watch data in my iOS app. While data collection and transfer work fine, the graph only shows a flat line instead of a proper visualization. Speed and altitude graphs work correctly. If anyone has experience with this, I’d love some guidance!