react-native-vision-camera/ios/CameraView+Focus.swift

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Swift
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2021-02-19 08:28:05 -07:00
//
// CameraView+focus.swift
// Cuvent
//
// Created by Marc Rousavy on 19.02.21.
// Copyright © 2021 Facebook. All rights reserved.
//
import Foundation
extension CameraView {
func focus(point: CGPoint, promise: Promise) {
withPromise(promise) {
guard let device = self.videoDeviceInput?.device else {
throw CameraError.session(SessionError.cameraNotReady)
}
if !device.isFocusPointOfInterestSupported {
throw CameraError.device(DeviceError.focusNotSupported)
}
let normalizedPoint = self.videoPreviewLayer.captureDevicePointConverted(fromLayerPoint: point)
do {
try device.lockForConfiguration()
device.focusPointOfInterest = normalizedPoint
device.focusMode = .continuousAutoFocus
if device.isExposurePointOfInterestSupported {
device.exposurePointOfInterest = normalizedPoint
device.exposureMode = .continuousAutoExposure
}
device.unlockForConfiguration()
return nil
} catch {
throw CameraError.device(DeviceError.configureError)
}
}
}
}