Holy moly, I never in a million years would've guessed that viewDidLoad would not have the correct view dimensions set up in time to layout stuff from there. Putting my code in viewWillLayoutSubviews worked. What a nightmare API.

FYI updated iPad to iPadOS 17.5.1, still getting the wrong view width via self.view.frame.size.width

Ah, well that I would not have guessed, thanks! However, while it works the first time I call it, if I try going back to auto exposure (with the following code): camera.exposureMode = .continuousAutoExposure; camera.isSubjectAreaChangeMonitoringEnabled = true; camera.setExposureTargetBias(0, completionHandler: nil); if (camera.activeFormat.isGlobalToneMappingSupported) { camera.isGlobalToneMappingEnabled = false; // enables local tone mapping }and then go back to my custom exposure mode (setting isSubjectAreaChangeMonitoringEnabled to false and calling camera.setExposureModeCustom(...), plus setting camera.isGlobalToneMappingEnabled to true again), the unwanted tone mapping returns (i.e. isn't diabled by setting camera.isGlobalToneMappingEnabled to true). Any ideas why it would work on the first call but not on subsequent calls? Is it just buggy?