fix(ios): 修复iOS摄像头对焦异常，优化多摄选择逻辑
1. 重构iOS原生对焦插件，支持按摄像头名称精准匹配设备 2. 优化摄像头选择逻辑，优先选用后置主摄并排除长焦/超广角镜头 3. 修复连续自动对焦失效问题，增加延迟初始化和定期校验 4. 添加调试日志便于排查摄像头相关问题
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“虞渠成”
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2acd61f832
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5c21080203
@ -1,23 +1,64 @@
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#import <AVFoundation/AVFoundation.h>
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#import <UIKit/UIKit.h>
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/// 通过名称查找摄像头设备
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static AVCaptureDevice *FindCameraByName(const char *cameraName)
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{
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if (cameraName == NULL || strlen(cameraName) == 0) {
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return [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
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}
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NSString *name = [NSString stringWithUTF8String:cameraName];
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// iOS 10+ DiscoverySession
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if (@available(iOS 10.0, *)) {
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AVCaptureDeviceDiscoverySession *session = [AVCaptureDeviceDiscoverySession
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discoverySessionWithDeviceTypes:@[AVCaptureDeviceTypeBuiltInWideAngleCamera,
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AVCaptureDeviceTypeBuiltInTelephotoCamera,
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AVCaptureDeviceTypeBuiltInUltraWideCamera]
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mediaType:AVMediaTypeVideo
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position:AVCaptureDevicePositionUnspecified];
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for (AVCaptureDevice *device in session.devices) {
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if ([device.localizedName containsString:name] ||
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[device.modelID containsString:name]) {
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return device;
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}
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}
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// 没找到精确匹配，返回第一个活跃的
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for (AVCaptureDevice *device in session.devices) {
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if (device.isConnected && !device.isSuspended) {
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return device;
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}
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}
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}
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return [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
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}
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extern "C" {
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/// 启用连续自动对焦和自动曝光
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void _EnableContinuousAutoFocus()
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/// 启用连续自动对焦和自动曝光（传入 C# 选中的摄像头名称）
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void _EnableContinuousAutoFocus(const char *cameraName)
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{
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dispatch_async(dispatch_get_main_queue(), ^{
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AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
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if (!device) return;
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AVCaptureDevice *device = FindCameraByName(cameraName);
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if (!device) {
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NSLog(@"[CameraFocusHelper] 未找到摄像头设备");
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return;
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}
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NSLog(@"[CameraFocusHelper] 配置设备: %@ (name=%@, model=%@)",
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device.localizedName, device.localizedName, device.modelID);
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NSError *error = nil;
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// 锁定设备开始配置
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if ([device lockForConfiguration:&error]) {
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// 连续自动对焦模式（持续调整，适合扫描二维码）
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// 连续自动对焦
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if ([device isFocusModeSupported:AVCaptureFocusModeContinuousAutoFocus]) {
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device.focusMode = AVCaptureFocusModeContinuousAutoFocus;
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NSLog(@"[CameraFocusHelper] 已设为连续自动对焦");
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} else {
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NSLog(@"[CameraFocusHelper] 设备不支持连续自动对焦");
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}
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// 连续自动曝光
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@ -25,36 +66,34 @@ extern "C" {
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device.exposureMode = AVCaptureExposureModeContinuousAutoExposure;
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}
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// 对焦范围限制为近距（适合二维码）
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if ([device respondsToSelector:@selector(setAutoFocusRangeRestriction:)]) {
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if ([device isAutoFocusRangeRestrictionSupported]) {
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device.autoFocusRangeRestriction = AVCaptureAutoFocusRangeRestrictionNear;
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}
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// 对焦范围限制为近距
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if ([device respondsToSelector:@selector(isAutoFocusRangeRestrictionSupported)] &&
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[device isAutoFocusRangeRestrictionSupported]) {
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device.autoFocusRangeRestriction = AVCaptureAutoFocusRangeRestrictionNear;
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NSLog(@"[CameraFocusHelper] 已设对焦范围为近距");
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}
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[device unlockForConfiguration];
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NSLog(@"[CameraFocusHelper] 已启用连续自动对焦");
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NSLog(@"[CameraFocusHelper] 摄像头配置完成");
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} else {
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NSLog(@"[CameraFocusHelper] 锁定设备失败: %@", error.localizedDescription);
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NSLog(@"[CameraFocusHelper] lockForConfiguration 失败: %@", error.localizedDescription);
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}
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});
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}
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/// 触发一次自动对焦（用于手动点按时调用）
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void _TriggerAutoFocus()
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/// 确保连续自动对焦仍在生效（传入 C# 选中的摄像头名称）
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void _EnsureContinuousAutoFocus(const char *cameraName)
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{
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dispatch_async(dispatch_get_main_queue(), ^{
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AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
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AVCaptureDevice *device = FindCameraByName(cameraName);
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if (!device) return;
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NSError *error = nil;
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if ([device lockForConfiguration:&error]) {
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if ([device isFocusModeSupported:AVCaptureFocusModeAutoFocus]) {
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device.focusMode = AVCaptureFocusModeAutoFocus;
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}
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if ([device isExposureModeSupported:AVCaptureExposureModeAutoExpose]) {
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device.exposureMode = AVCaptureExposureModeAutoExpose;
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if (device.focusMode != AVCaptureFocusModeContinuousAutoFocus &&
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[device isFocusModeSupported:AVCaptureFocusModeContinuousAutoFocus]) {
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device.focusMode = AVCaptureFocusModeContinuousAutoFocus;
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NSLog(@"[CameraFocusHelper] 重新设回连续自动对焦");
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}
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[device unlockForConfiguration];
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}
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@ -45,10 +45,10 @@ namespace Kill.UI.Pages
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#if UNITY_IOS && !UNITY_EDITOR
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[DllImport("__Internal")]
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private static extern void _EnableContinuousAutoFocus();
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private static extern void _EnableContinuousAutoFocus(string cameraName);
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[DllImport("__Internal")]
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private static extern void _TriggerAutoFocus();
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private static extern void _EnsureContinuousAutoFocus(string cameraName);
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#endif
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// 摄像头相关
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private WebCamTexture webCamTexture;
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@ -59,6 +59,9 @@ namespace Kill.UI.Pages
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// 扫描结果回调
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public event Action<string> OnQRCodeScanned;
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// iOS 摄像头名称（供原生对焦插件使用）
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private string selectedCameraName;
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void OnEnable()
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{
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StartScan();
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@ -148,17 +151,32 @@ namespace Kill.UI.Pages
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yield break;
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}
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// 优先使用后置摄像头，并选择支持自动对焦的摄像头
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// 优先使用后置主摄（广角），iOS 多摄设备排除超广角/长焦
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string deviceName = devices[0].name;
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currentDevice = devices[0];
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for (int i = 0; i < devices.Length; i++)
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{
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if (!devices[i].isFrontFacing)
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{
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deviceName = devices[i].name;
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currentDevice = devices[i];
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break;
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string lowerName = devices[i].name.ToLower();
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// iOS 多摄命名: "Back Camera", "Telephoto Camera", "Ultra Wide Camera"
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// 优先选不带 telephoto/ultra wide 的后置摄像头（即主摄）
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if (!lowerName.Contains("telephoto") && !lowerName.Contains("ultra wide"))
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{
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deviceName = devices[i].name;
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currentDevice = devices[i];
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break;
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}
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// 兜底：第一个后置
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if (deviceName == devices[0].name)
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{
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deviceName = devices[i].name;
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currentDevice = devices[i];
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}
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}
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}
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Debug.Log($"[ScanQRcode] 选中摄像头: {deviceName}");
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selectedCameraName = deviceName;
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RectTransform cameraPreviewRect=cameraPreview.GetComponent<RectTransform>();
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// 使用较低的扫描分辨率以提高性能
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int targetWidth = 2160;
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@ -172,11 +190,13 @@ namespace Kill.UI.Pages
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// 等待摄像头启动
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yield return new WaitUntil(() => webCamTexture.width > 100);
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// iOS: 调用原生插件强制开启连续自动对焦
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// iOS: 延迟后调用原生插件强制开启连续自动对焦
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// (等待 Unity 内部 AVCaptureSession 完全就绪)
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#if UNITY_IOS && !UNITY_EDITOR
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if (enableAutoFocus)
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{
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_EnableContinuousAutoFocus();
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yield return new WaitForSeconds(1.5f);
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_EnableContinuousAutoFocus(deviceName);
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}
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#endif
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// 调整预览画面比例
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@ -287,7 +307,7 @@ namespace Kill.UI.Pages
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/// <summary>
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/// 自动对焦维护协程
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/// iOS: 走原生插件（连续自动对焦已启用，只需定期触发即可）
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/// iOS: 走原生插件周期确保连续对焦模式不被重置
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/// 其他平台: 使用 WebCamTexture.autoFocusPoint 定期设置对焦点
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/// </summary>
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private IEnumerator AutoFocusCoroutine()
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@ -295,8 +315,11 @@ namespace Kill.UI.Pages
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while (isScanning)
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{
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#if UNITY_IOS && !UNITY_EDITOR
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// iOS 通过原生插件触发一次自动对焦
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_TriggerAutoFocus();
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// iOS 通过原生插件确保连续自动对焦仍在生效
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if (!string.IsNullOrEmpty(selectedCameraName))
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{
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_EnsureContinuousAutoFocus(selectedCameraName);
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}
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#else
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// Android/其他: 定期重置对焦点到画面中心
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if (webCamTexture != null && webCamTexture.isPlaying)
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