react-native-vision-camera/ios/CameraView+Zoom.swift
Marc Rousavy 9ea158ad8f
chore: Move to /mrousavy/ (#224)
* rename 1/n

* 2

* 3

* fix indent
2021-06-21 22:42:46 +02:00

74 lines
1.9 KiB
Swift

//
// CameraView+Zoom.swift
// mrousavy
//
// Created by Marc Rousavy on 18.12.20.
// Copyright © 2020 mrousavy. All rights reserved.
//
import Foundation
extension CameraView {
var minAvailableZoom: CGFloat {
return videoDeviceInput?.device.minAvailableVideoZoomFactor ?? 1
}
var maxAvailableZoom: CGFloat {
return videoDeviceInput?.device.activeFormat.videoMaxZoomFactor ?? 1
}
@objc
final func onPinch(_ gesture: UIPinchGestureRecognizer) {
guard let device = videoDeviceInput?.device else {
return
}
let scale = max(min(gesture.scale * pinchScaleOffset, device.activeFormat.videoMaxZoomFactor), CGFloat(1.0))
if gesture.state == .ended {
pinchScaleOffset = scale
return
}
do {
try device.lockForConfiguration()
device.videoZoomFactor = scale
device.unlockForConfiguration()
} catch {
invokeOnError(.device(.configureError))
}
}
func addPinchGestureRecognizer() {
removePinchGestureRecognizer()
pinchGestureRecognizer = UIPinchGestureRecognizer(target: self, action: #selector(onPinch(_:)))
addGestureRecognizer(pinchGestureRecognizer!)
}
func removePinchGestureRecognizer() {
if let pinchGestureRecognizer = self.pinchGestureRecognizer {
removeGestureRecognizer(pinchGestureRecognizer)
self.pinchGestureRecognizer = nil
}
}
@objc
final func zoom(factor: CGFloat, animated: Bool) {
guard let device = videoDeviceInput?.device else {
return
}
do {
try device.lockForConfiguration()
let clamped = max(min(factor, device.activeFormat.videoMaxZoomFactor), CGFloat(1.0))
if animated {
device.ramp(toVideoZoomFactor: clamped, withRate: 1)
} else {
device.videoZoomFactor = clamped
}
device.unlockForConfiguration()
} catch {
invokeOnError(.device(.configureError))
}
}
}