I understand that the camera in iOS automatically adjusts exposure continuously when capturing video and photos.
Questions:
How can I turn off the camera's automatic exposure?
In Swift code, how can I set the exposure for the camera to "zero" so that exposure is completely neutral to the surroundings and not compensating for light?
If you need only min, current and max exposure values, then you can use the following:
Swift 5
import AVFoundation
enum Esposure {
case min, normal, max
func value(device: AVCaptureDevice) -> Float {
switch self {
case .min:
return device.activeFormat.minISO
case .normal:
return AVCaptureDevice.currentISO
case .max:
return device.activeFormat.maxISO
}
}
}
func set(exposure: Esposure) {
guard let device = AVCaptureDevice.default(for: AVMediaType.video) else { return }
if device.isExposureModeSupported(.custom) {
do{
try device.lockForConfiguration()
device.setExposureModeCustom(duration: AVCaptureDevice.currentExposureDuration, iso: exposure.value(device: device)) { (_) in
print("Done Esposure")
}
device.unlockForConfiguration()
}
catch{
print("ERROR: \(String(describing: error.localizedDescription))")
}
}
}