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自定义相机碰到的问题，比如常见的拍照录制视频方向，镜像左右颠倒等问题
来源：cnblogs　　作者：辣手小火星　　时间：2020/11/9 16:00:46　　对本文有异议

iOS开发了好几年了，自定义相机都碰到过很多次，每次都是从网上copy代码使用，但是很多时候都会有方向等问题，从来没有真正研究过，现在在这里记录一下自定义相机碰到的问题，以防忘记
问题一：横向拍照/录制视频，得到的视频也需要横屏。
　　　　要实现这个功能，就需要获取到设备的方向，这里有两种方法获取方向
　　　　方法一：根据设备方向开关来获取方向，[UIDevice currentDevice].orientation
　　　　方法二：根据重力感应获取方向


  1. DN_WEAK_SELF
  3.     if([self.cmmotionManager isDeviceMotionAvailable]) {
  5.        [self.cmmotionManager startAccelerometerUpdatesToQueue:[NSOperationQueue currentQueue] withHandler:^(CMAccelerometerData * _Nullable accelerometerData, NSError * _Nullable error) {
  7.            DN_STRONG_SELF
  9.            double x = accelerometerData.acceleration.x;
  11.            double y = accelerometerData.acceleration.y;
  13.            if (fabs(y) >= fabs(x)) {
  15.                if (y >= 0) {
  17.                    //Down
  19.                    self.deviceOrientation = UIDeviceOrientationPortraitUpsideDown;
  21.                } else {
  23.                    //Portrait
  25.                    self.deviceOrientation = UIDeviceOrientationPortrait;
  27.                }
  29.            } else {
  31.                if (x >= 0) {
  33.                    //Righ
  35.                    self.deviceOrientation = UIDeviceOrientationLandscapeRight;
  37.                } else {
  39.                    //Left
  41.                    self.deviceOrientation = UIDeviceOrientationLandscapeLeft;
  43.                }
  45.            }
  47.        }];
  49.     }

 

　　　　　获取到方向后，在拍照前设置方向


  1. AVCaptureConnection *myVideoConnection = [self.ImageOutPut connectionWithMediaType:AVMediaTypeVideo];
  3.     if ([myVideoConnection isVideoOrientationSupported]) {
  5.         myVideoConnection.videoOrientation = [self getCaptureVideoOrientation:self.deviceOrientation];
  7.     }

 

　　　　　在录制视频前设置方向


  1. AVCaptureConnection *connection = [self.captureMovieFileOutput connectionWithMediaType:AVMediaTypeVideo];
  3. if ([connection isVideoOrientationSupported]) {
  5.      connection.videoOrientation = [self getCaptureVideoOrientation:self.deviceOrientation];
  7. }

 

 

问题二： 前置摄像头拍照时，照片和视频左右颠倒（类似微信）

　　　　这个问题其实很简单，只要设置一下输出对象的镜像开关就可以了


  1. AVCaptureSession *session = (AVCaptureSession *)self.session;
  3.         for (AVCaptureVideoDataOutput* output in session.outputs) {
  5.             for (AVCaptureConnection * av in output.connections) {
  7.                 //判断是否是前置摄像头状态
  8.  
  9.                 if ([self.input device].position == AVCaptureDevicePositionFront) {
  11.                     if (av.supportsVideoMirroring) {
  13.                         //镜像设置
  15.                         av.videoMirrored = YES;
  17.                     }
  19.                 }
  21.             }
  23.         }

 

 

　　　　录制视频的话，解决左右颠倒 只能用以上的方法

　　　　而拍照的话，解决左右颠倒，还有一种方法，在拍完照片后，设置图片方向


  1. UIImageOrientation imgOrientation; //拍摄后获取的的图像方向
  2.  
  3.     if ([self.input device].position == AVCaptureDevicePositionFront &&
  5.      self.isFixLeftRightProblem) {
  7.      NSLog(@"前置摄像头");
  9.      // 前置摄像头图像方向 UIImageOrientationLeftMirrored
  11.      // IOS前置摄像头左右成像
  13.      imgOrientation = UIImageOrientationLeftMirrored;
  15.      if (image.imageOrientation == UIImageOrientationRight) {
  17.          imgOrientation = UIImageOrientationLeftMirrored;
  19.      }else if (image.imageOrientation == UIImageOrientationLeft) {
  21.          imgOrientation = UIImageOrientationRightMirrored;
  23.      }else if (image.imageOrientation == UIImageOrientationDown) {
  25.          imgOrientation = UIImageOrientationDownMirrored;
  27.      }else if (image.imageOrientation == UIImageOrientationUp) {
  29.          imgOrientation = UIImageOrientationUpMirrored;
  31.      }
  33.      image = [[UIImage alloc]initWithCGImage:image.CGImage scale:1.0f orientation:imgOrientation];
  35.     }

 

问题三：自定义相机拍照后，在其他端查看时，方向不正确

　　　　这时候就需要矫正方向了


  1. /*    !
  3.  ** 矫正图片方向 参考 http://www.cocoachina.com/articles/12021
  4.  
  5.  */
  6.  
  7. - (UIImage *)fixOrientation {
  9.     
  11.     // No-op if the orientation is already correct
  12.  
  13.     if (self.imageOrientation == UIImageOrientationUp) return self;
  15.     
  17.     // We need to calculate the proper transformation to make the image upright.
  19.     // We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.
  21.     CGAffineTransform transform = CGAffineTransformIdentity;
  23.     
  25.     switch (self.imageOrientation) {
  27.         case UIImageOrientationDown:
  29.         case UIImageOrientationDownMirrored:
  31.             transform = CGAffineTransformTranslate(transform, self.size.width, self.size.height);
  33.             transform = CGAffineTransformRotate(transform, M_PI);
  35.             break;
  37.             
  39.         case UIImageOrientationLeft:
  41.         case UIImageOrientationLeftMirrored:
  43.             transform = CGAffineTransformTranslate(transform, self.size.width, 0);
  45.             transform = CGAffineTransformRotate(transform, M_PI_2);
  47.             break;
  49.             
  51.         case UIImageOrientationRight:
  53.         case UIImageOrientationRightMirrored:
  55.             transform = CGAffineTransformTranslate(transform, 0, self.size.height);
  57.             transform = CGAffineTransformRotate(transform, -M_PI_2);
  59.             break;
  61.         case UIImageOrientationUp:
  63.         case UIImageOrientationUpMirrored:
  65.             break;
  67.     }
  69.     
  71.     switch (self.imageOrientation) {
  73.         case UIImageOrientationUpMirrored:
  75.         case UIImageOrientationDownMirrored:
  77.             transform = CGAffineTransformTranslate(transform, self.size.width, 0);
  79.             transform = CGAffineTransformScale(transform, -1, 1);
  81.             break;
  83.             
  85.         case UIImageOrientationLeftMirrored:
  87.         case UIImageOrientationRightMirrored:
  89.             transform = CGAffineTransformTranslate(transform, self.size.height, 0);
  91.             transform = CGAffineTransformScale(transform, -1, 1);
  93.             break;
  95.         case UIImageOrientationUp:
  97.         case UIImageOrientationDown:
  99.         case UIImageOrientationLeft:
  101.         case UIImageOrientationRight:
  103.             break;
  105.     }
  107.     
  109.     // Now we draw the underlying CGImage into a new context, applying the transform
  111.     // calculated above.
  113.     CGContextRef ctx = CGBitmapContextCreate(NULL, self.size.width, self.size.height,
  115.                                              CGImageGetBitsPerComponent(self.CGImage), 0,
  117.                                              CGImageGetColorSpace(self.CGImage),
  119.                                              CGImageGetBitmapInfo(self.CGImage));
  121.     CGContextConcatCTM(ctx, transform);
  123.     switch (self.imageOrientation) {
  125.         case UIImageOrientationLeft:
  127.         case UIImageOrientationLeftMirrored:
  129.         case UIImageOrientationRight:
  131.         case UIImageOrientationRightMirrored:
  133.             // Grr...
  135.             CGContextDrawImage(ctx, CGRectMake(0,0,self.size.height,self.size.width), self.CGImage);
  137.             break;
  139.             
  141.         default:
  143.             CGContextDrawImage(ctx, CGRectMake(0,0,self.size.width,self.size.height), self.CGImage);
  145.             break;
  147.     }
  149.     
  151.     // And now we just create a new UIImage from the drawing context
  153.     CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
  155.     UIImage *img = [UIImage imageWithCGImage:cgimg];
  157.     CGContextRelease(ctx);
  159.     CGImageRelease(cgimg);
  161.     return img;
  163. }

 

问题四：自定义相机打开后，这时候来电话了，再切回到相机不能拍照了。

　　　这里就需要监听音频中断的通知AVCaptureSessionWasInterruptedNotification，中断结束的通知AVCaptureSessionInterruptionEndedNotification

　　   还要监听系统电话来电  CTCallCenter  callEventHandler，在中断通知AVCaptureSessionWasInterruptedNotification中，将音频输入设备从session中移除，等中断通知结束后，判断是否时系统电话造成的，如果是则将音频输入设备加入session

　　　监听来电的代码 <CoreTelephony/CTCallCenter.h>  <CoreTelephony/CTCall.h>


  1. DN_WEAK_SELF
  3.     self.callCenter = [[CTCallCenter alloc] init];
  5.     self.callCenter.callEventHandler = ^(CTCall * call) {
  7.         DN_STRONG_SELF
  9.         if([call.callState isEqualToString:CTCallStateDisconnected]) {
  11.             NSLog(@"Call has been disconnected");//电话被挂断(我们用的这个)
  13.             self.isSystemCall = NO;
  15.         } else if([call.callState isEqualToString:CTCallStateConnected]) {
  17.             NSLog(@"Call has been connected");//电话被接听
  19.         } else if([call.callState isEqualToString:CTCallStateIncoming]) {
  21.             NSLog(@"Call is incoming");//来电话了
  23.             self.isSystemCall = YES;
  25.             [self endCall];
  27.         } else if([call.callState isEqualToString:CTCallStateDialing]) {
  29.             NSLog(@"Call is Dialing");//拨号
  31.             self.isSystemCall = YES;
  33.             [self endCall];
  35.         } else {
  37.             NSLog(@"Nothing is done");
  39.         }
  41.     };

 

　　　　中断音频代码

 

  1. - (void)initNotification {
  3.     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(AVCaptureSessionWasInterruptedNotification:) name:AVCaptureSessionWasInterruptedNotification object:self.session];
  5.     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(AVCaptureSessionInterruptionEndedNotification:) name:AVCaptureSessionInterruptionEndedNotification object:self.session];
  7. }
  9. #pragma mark - 通知
  10.  
  11. - (void)AVCaptureSessionWasInterruptedNotification:(NSNotification *)notification {
  13.     AVCaptureSessionInterruptionReason reason = [notification.userInfo[AVCaptureSessionInterruptionReasonKey] integerValue];
  15.     NSLog(@"fanshijian 中断 : %d reason : %ld",self.session.interrupted,(long)reason);
  17.     if (reason == AVCaptureSessionInterruptionReasonAudioDeviceInUseByAnotherClient) {
  19.         [self removeAudioInput];
  21.     }
  23. }
  25.  
  27. - (void)AVCaptureSessionInterruptionEndedNotification:(NSNotification *)notification {
  29.     NSLog(@"fanshijian 中断结束 : %d",self.session.interrupted);
  31.     if (![DNVideoChatConfig sharedConfig].isSystemCall) {
  33.         [self addAudioInput];
  35.     }
  37. }
  39. - (void)addAudioInput {
  41.     if (!_audioCaptureDeviceInput) {
  43.         //添加一个音频输入设备
  45.         AVCaptureDevice *audioCaptureDevice = [[AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio] firstObject];
  47.         //添加音频
  49.         NSError *error = nil;
  51.         AVCaptureDeviceInput *audioCaptureDeviceInput = [[AVCaptureDeviceInput alloc]initWithDevice:audioCaptureDevice error:&error];
  53.         if (error) {
  55.             NSLog(@"取得设备输入对象时出错，错误原因：%@",error.localizedDescription);
  57.             return;
  59.         }
  61.         self.audioCaptureDeviceInput = audioCaptureDeviceInput;
  63.     }
  65.     
  67.     if ([self.session canAddInput:self.audioCaptureDeviceInput]) {
  69.         [self.session addInput:self.audioCaptureDeviceInput];
  71.     }
  73. }
  75.  
  77. - (void)removeAudioInput {
  79.     [self.session removeInput:self.audioCaptureDeviceInput];
  81. }

 可以参考demo https://github.com/smallMas/FSEditVideo.git     类FSLiveWindow

原文链接：http://www.cnblogs.com/smallMas/p/13809349.html

 友情链接：直通硅谷 　点职佳 　北美留学生论坛

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