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