52 lines
1.5 KiB
Swift
52 lines
1.5 KiB
Swift
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//
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// UsbCameraView.swift
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// usb_camera_android
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//
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// iOS 原生预览 PlatformView：用 AVCaptureVideoPreviewLayer 直接渲染 session。
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//
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import AVFoundation
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import Flutter
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import UIKit
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/// 以 AVCaptureVideoPreviewLayer 作为 backing layer 的 UIView。
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final class UsbCameraPreviewUIView: UIView {
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override class var layerClass: AnyClass { AVCaptureVideoPreviewLayer.self }
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var previewLayer: AVCaptureVideoPreviewLayer {
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return layer as! AVCaptureVideoPreviewLayer
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}
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}
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final class UsbCameraView: NSObject, FlutterPlatformView {
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private let previewView: UsbCameraPreviewUIView
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init(engine: UsbCameraEngine, frame: CGRect) {
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self.previewView = UsbCameraPreviewUIView(frame: frame)
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super.init()
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previewView.previewLayer.session = engine.captureSession
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previewView.previewLayer.videoGravity = .resizeAspect
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}
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func view() -> UIView {
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return previewView
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}
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}
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final class UsbCameraViewFactory: NSObject, FlutterPlatformViewFactory {
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private let engine: UsbCameraEngine
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init(engine: UsbCameraEngine) {
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self.engine = engine
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super.init()
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}
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func createArgsCodec() -> FlutterMessageCodec & NSObjectProtocol {
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return FlutterStandardMessageCodec.sharedInstance()
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}
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func create(withFrame frame: CGRect, viewIdentifier viewId: Int64,
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arguments args: Any?) -> FlutterPlatformView {
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return UsbCameraView(engine: engine, frame: frame)
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}
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}
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