🐛 in iOS 18, onPreviewStarted is no longer called when switching devices #3226
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🐛 bug
Something isn't working
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Guten Tag, Hans here! 🍻 Thanks for your detailed issue report. It looks like you have provided a lot of useful information. However, I see that you did not attempt to reproduce the issue in the VisionCamera Example app. This step is quite important to help identify if the problem is specific to your setup or a broader bug. Please give it a try and let us know if the issue persists. If so, it would also be helpful to share any additional logs from Xcode when reproducing the issue, which can be gathered from the Xcode console while running your app. This can aid mrousavy in diagnosing the problem more efficiently. If you're finding this project helpful, consider supporting it by sponsoring mrousavy here!
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@mrousavy I attempted to build the example app, but the build fails with the following error: |
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Delete your |
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Thanks — the build still fails with a similar error. Here is the full build log: |
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What's happening?
In iOS 17, switching between front and back cameras results in
onPreviewStoppedbeing invoked, followed byonPreviewStarted. In iOS 18, neither method is invoked when switching cameras.Reproduceable Code
Relevant log output
// Log output on switching between front and back cameras 18:12:56.605: [info] 📸 VisionCamera.didSetProps(_:): Updating 3 props: [cameraId, isMirrored, format] 18:12:56.605: [info] 📸 VisionCamera.configure(_:): configure { ... }: Waiting for lock... 18:12:56.605: [info] 📸 VisionCamera.configure(_:): configure { ... }: Updating CameraSession Configuration... Difference(inputChanged: true, outputsChanged: true, videoStabilizationChanged: true, orientationChanged: true, formatChanged: true, sidePropsChanged: true, torchChanged: true, zoomChanged: true, exposureChanged: true, audioSessionChanged: false, locationChanged: false) 18:12:56.605: [info] 📸 VisionCamera.configureDevice(configuration:): Configuring Input Device... 18:12:56.605: [info] 📸 VisionCamera.configureDevice(configuration:): Configuring Camera com.apple.avfoundation.avcapturedevice.built-in_video:7... 18:12:56.607: [info] 📸 VisionCamera.configureDevice(configuration:): Successfully configured Input Device! 18:12:56.607: [info] 📸 VisionCamera.configureOutputs(configuration:): Configuring Outputs... 18:12:56.607: [info] 📸 VisionCamera.configureOutputs(configuration:): Adding Photo output... 18:12:56.608: [info] 📸 VisionCamera.configureOutputs(configuration:): Adding Video Data output... 18:12:56.608: [info] 📸 VisionCamera.configurePreviewOrientation(_:): Updating Preview rotation: portrait... 18:12:56.608: [info] 📸 VisionCamera.configureOutputOrientation(_:): Updating Outputs rotation: portrait... 18:12:56.608: [info] 📸 VisionCamera.configureOutputs(configuration:): Successfully configured all outputs! 18:12:56.608: [info] 📸 VisionCamera.setTargetOutputOrientation(_:): Setting target output orientation from preview to preview... 18:12:56.608: [info] 📸 VisionCamera.configureFormat(configuration:device:): Configuring Format (5712x4284 | 4032x3024@30.0 (ISO: 55.0..12320.0))... 18:12:56.608: [info] 📸 VisionCamera.configureFormat(configuration:device:): Already selected active format, no need to configure. 18:12:56.608: [info] 📸 VisionCamera.getPixelFormat(for:): Available Pixel Formats: ["420v", "420f", "BGRA", "&8v0", "-8v0", "&8f0", "-8f0", "&BGA", "-BGA"], finding best match... (pixelFormat="rgb", enableHdr={false}, enableBufferCompression={true}) 18:12:56.608: [info] 📸 VisionCamera.getPixelFormat(for:): Using PixelFormat: -BGA... 18:12:56.627: [info] 📸 VisionCamera.didSetProps(_:): Updating 2 props: [exposure, zoom] 18:12:56.627: [info] 📸 VisionCamera.configure(_:): configure { ... }: Waiting for lock... 18:12:57.840: [info] 📸 VisionCamera.configure(_:): configure { ... }: Updating CameraSession Configuration... Difference(inputChanged: false, outputsChanged: false, videoStabilizationChanged: false, orientationChanged: false, formatChanged: false, sidePropsChanged: false, torchChanged: false, zoomChanged: true, exposureChanged: false, audioSessionChanged: false, locationChanged: false)Camera Device
{ "hasTorch": true, "sensorOrientation": "portrait", "id": "com.apple.avfoundation.avcapturedevice.built-in_video:7", "isMultiCam": true, "minZoom": 1, "formats": [], "hardwareLevel": "full", "minExposure": -8, "hasFlash": true, "name": "Back Triple Camera", "position": "back", "supportsFocus": true, "supportsRawCapture": false, "neutralZoom": 2, "physicalDevices": [ "ultra-wide-angle-camera", "wide-angle-camera", "telephoto-camera" ], "maxZoom": 123.75, "minFocusDistance": 2, "supportsLowLightBoost": false, "maxExposure": 8 }Device
iPhone 15 Pro (iOS 18.0.1)
VisionCamera Version
4.3.2
Can you reproduce this issue in the VisionCamera Example app?
I didn't try (⚠️ your issue might get ignored & closed if you don't try this)
Additional information
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