57 lines
1.9 KiB
Swift
57 lines
1.9 KiB
Swift
import AVFoundation
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/// 扫码采集会话的配置与运行接口，便于独立验证生命周期顺序。
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protocol QRCodeCaptureSession: AnyObject {
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/// 当前是否正在采集。
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var isRunning: Bool { get }
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/// 开始批量配置。
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func beginConfiguration()
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/// 提交批量配置。
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func commitConfiguration()
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/// 启动采集。
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func startRunning()
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/// 停止采集。
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func stopRunning()
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}
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extension AVCaptureSession: QRCodeCaptureSession {}
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/// 在同一串行队列中配置和启停相机，避免配置提交与启动交叉执行。
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final class QRCodeCaptureSessionController {
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private let session: QRCodeCaptureSession
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private let queue: DispatchQueue
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private var isConfigured = false
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/// 创建会话生命周期控制器；队列必须为串行队列。
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init(session: QRCodeCaptureSession,
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queue: DispatchQueue = DispatchQueue(label: "com.zhifly.suixinkan.qr-capture")) {
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self.session = session
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self.queue = queue
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}
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/// 在配置事务内添加输入输出，提交完成后在主线程通知结果。
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func configure(_ configuration: @escaping () -> Bool, completion: @escaping (Bool) -> Void) {
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queue.async { [self] in
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if !isConfigured {
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session.beginConfiguration()
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isConfigured = configuration()
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session.commitConfiguration()
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}
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let succeeded = isConfigured
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DispatchQueue.main.async { completion(succeeded) }
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}
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}
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/// 按提交顺序更新运行状态，运行状态的读取也限定在会话队列内。
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func setRunning(_ shouldRun: Bool) {
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queue.async { [self] in
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if shouldRun {
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guard isConfigured, !session.isRunning else { return }
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session.startRunning()
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} else if session.isRunning {
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session.stopRunning()
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}
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}
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}
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}
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