导入 XuXuCheck 工程(iOS 干化学尿液试纸分析 App)

从桌面工程复制而来,作为本仓库的 Xuxucheck/ 子目录。为控制仓库体积做了两处删减: - 移除 Frameworks/opencv2.xcframework 下的两个 visionOS 切片 (xros-arm64、xros-arm64-simulator,合计约 106 MB),并同步删掉该 xcframework 内 Info.plist 里对应的两条 AvailableLibraries 记录, 只保留 ios-arm64 与 ios-arm64_x86_64-simulator。 - 移除全部 .DS_Store 与 xcuserdata/。已用 xcodebuild 从本目录完整编译验证:BUILD SUCCEEDED, ProcessXCFramework 以 --platform ios 成功选中框架,产物含 3699 个 cv:: 符号 (OpenCV 确实链入),嵌入 framework 3 个,与移除无用 pod 之后的状态一致。仓库约 206 MB,其中 OpenCV 203 MB、其余源码与依赖约 3 MB。
2026-09-23 14:17:31 +08:00
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+//
+//  AVCaptureDevice+bestForBuiltInCamera.swift
+//  https://github.com/twostraws/CodeScanner
+//
+//  Created by Karol Bielski on 10/02/2024.
+//  Copyright © 2024 Paul Hudson. All rights reserved.
+//
+
+#if os(iOS)
+import AVFoundation
+
+@available(macCatalyst 14.0, *)
+extension AVCaptureDevice {
+    
+    /// Returns best built in back camera for scanning QR codes zoomed for a given minimum code size.
+    public static func zoomedCameraForQRCode(withMinimumCodeSize minimumCodeSize: Float = 20) -> AVCaptureDevice? {
+        let captureDevice = AVCaptureDevice.DiscoverySession(
+            deviceTypes: [.builtInWideAngleCamera],
+            mediaType: .video,
+            position: .back
+        ).devices.first ?? AVCaptureDevice.default(for: .video)
+        
+        if #available(iOS 15.0, *) {
+            captureDevice?.setRecommendedZoomFactor(forMinimumCodeSize: minimumCodeSize)
+        }
+        
+        return captureDevice
+    }
+    
+    /// Sets recommended zoom factor for a given minimum code size.
+    @available(iOS 15.0, *)
+    func setRecommendedZoomFactor(forMinimumCodeSize minimumCodeSize: Float) {
+        /*
+         Optimize the user experience for scanning QR codes down to given size.
+         When scanning a QR code of that size, the user may need to get closer than
+         the camera's minimum focus distance to fill the rect of interest.
+         To have the QR code both fill the rect and still be in focus, we may need to apply some zoom.
+         */
+        let deviceMinimumFocusDistance = Float(minimumFocusDistance)
+        guard deviceMinimumFocusDistance != -1 else { return }
+        
+        let deviceFieldOfView = activeFormat.videoFieldOfView
+        let formatDimensions = CMVideoFormatDescriptionGetDimensions(activeFormat.formatDescription)
+        let rectOfInterestWidth = Double(formatDimensions.height) / Double(formatDimensions.width)
+        let minimumSubjectDistanceForCode = minimumSubjectDistanceForCode(
+            fieldOfView: deviceFieldOfView,
+            minimumCodeSize: minimumCodeSize,
+            previewFillPercentage: Float(rectOfInterestWidth)
+        )
+        
+        guard minimumSubjectDistanceForCode < deviceMinimumFocusDistance else { return }
+        
+        let zoomFactor = deviceMinimumFocusDistance / minimumSubjectDistanceForCode
+        do {
+            try lockForConfiguration()
+            videoZoomFactor = CGFloat(zoomFactor)
+            unlockForConfiguration()
+        } catch {
+            print("Could not lock for configuration: \(error)")
+        }
+    }
+    
+    private func minimumSubjectDistanceForCode(
+        fieldOfView: Float,
+        minimumCodeSize: Float,
+        previewFillPercentage: Float
+    ) -> Float {
+        /*
+         Given the camera horizontal field of view, we can compute the distance (mm) to make a code
+         of minimumCodeSize (mm) fill the previewFillPercentage.
+         */
+        let radians = (fieldOfView / 2).radians
+        let filledCodeSize = minimumCodeSize / previewFillPercentage
+        return filledCodeSize / tan(radians)
+    }
+}
+
+private extension Float {
+    var radians: Float {
+        self * Float.pi / 180
+    }
+}
+#endif
+
+/*
+ Part of this code is copied from Apple sample project "AVCamBarcode: Using AVFoundation to capture barcodes".
+
+ IMPORTANT:  This Apple software is supplied to you by Apple
+ Inc. ("Apple") in consideration of your agreement to the following
+ terms, and your use, installation, modification or redistribution of
+ this Apple software constitutes acceptance of these terms.  If you do
+ not agree with these terms, please do not use, install, modify or
+ redistribute this Apple software.
+
+ In consideration of your agreement to abide by the following terms, and
+ subject to these terms, Apple grants you a personal, non-exclusive
+ license, under Apple's copyrights in this original Apple software (the
+ "Apple Software"), to use, reproduce, modify and redistribute the Apple
+ Software, with or without modifications, in source and/or binary forms;
+ provided that if you redistribute the Apple Software in its entirety and
+ without modifications, you must retain this notice and the following
+ text and disclaimers in all such redistributions of the Apple Software.
+ Neither the name, trademarks, service marks or logos of Apple Inc. may
+ be used to endorse or promote products derived from the Apple Software
+ without specific prior written permission from Apple.  Except as
+ expressly stated in this notice, no other rights or licenses, express or
+ implied, are granted by Apple herein, including but not limited to any
+ patent rights that may be infringed by your derivative works or by other
+ works in which the Apple Software may be incorporated.
+
+ The Apple Software is provided by Apple on an "AS IS" basis.  APPLE
+ MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
+ THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
+ FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
+ OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
+
+ IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
+ OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
+ MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
+ AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
+ STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
+ POSSIBILITY OF SUCH DAMAGE.
+
+ Copyright (C) 2016 Apple Inc. All Rights Reserved.
+ */