iOS开发-自定义相机实例(仿微信)

网上有很多自定义相机的例子，这里只是我临时写的一个小demo，仅供参考：

用到了下面几个库：

#import 
#import 

在使用的时候需要在Info.plist中把相关权限写进去：

Privacy - Microphone Usage Description
Privacy - Photo Library Usage Description
Privacy - Camera Usage Description

我在写这个demo时，是按照微信的样式写的，同样是点击拍照、长按录制视频，视频录制完直接进行播放，这里封装了一个简易的播放器：

m文件

#import "HAVPlayer.h"
#import 

@interface HAVPlayer ()

@property (nonatomic,strong) AVPlayer *player;//播放器对象

@end

@implementation HAVPlayer



- (instancetype)initWithframe:(CGRect)frame withShowInView:(UIView *)bgView url:(NSURL *)url {
  if (self = [self initWithframe:frame]) {
    //创建播放器层
    AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];
    playerLayer.frame = self.bounds;

    [self.layer addSublayer:playerLayer];
    if (url) {
      self.videoUrl = url;
    }

    [bgView addSubview:self];
  }
  return self;
}

- (void)dealloc {
  [self removeAvPlayerNtf];
  [self stopPlayer];
  self.player = nil;
}

- (AVPlayer *)player {
  if (!_player) {
    _player = [AVPlayer playerWithPlayerItem:[self getAVPlayerItem]];
    [self addAVPlayerNtf:_player.currentItem];

  }

  return _player;
}

- (AVPlayerItem *)getAVPlayerItem {
  AVPlayerItem *playerItem=[AVPlayerItem playerItemWithURL:self.videoUrl];
  return playerItem;
}

- (void)setVideoUrl:(NSURL *)videoUrl {
  _videoUrl = videoUrl;
  [self removeAvPlayerNtf];
  [self nextPlayer];
}

- (void)nextPlayer {
  [self.player seekToTime:CMTimeMakeWithSeconds(0, _player.currentItem.duration.timescale)];
  [self.player replaceCurrentItemWithPlayerItem:[self getAVPlayerItem]];
  [self addAVPlayerNtf:self.player.currentItem];
  if (self.player.rate == 0) {
    [self.player play];
  }
}

- (void) addAVPlayerNtf:(AVPlayerItem *)playerItem {
  //监控状态属性
  [playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];
  //监控网络加载情况属性
  [playerItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil];

  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playbackFinished:) name:AVPlayerItemDidPlayToEndTimeNotification object:self.player.currentItem];
}

- (void)removeAvPlayerNtf {
  AVPlayerItem *playerItem = self.player.currentItem;
  [playerItem removeObserver:self forKeyPath:@"status"];
  [playerItem removeObserver:self forKeyPath:@"loadedTimeRanges"];
  [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)stopPlayer {
  if (self.player.rate == 1) {
    [self.player pause];//如果在播放状态就停止
  }
}


-(void)observevalueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
  AVPlayerItem *playerItem = object;
  if ([keyPath isEqualToString:@"status"]) {
    AVPlayerStatus status= [[change objectForKey:@"new"] intValue];
    if(status==AVPlayerStatusReadyToPlay){
      NSLog(@"正在播放...，视频总长度:%.2f",CMTimeGetSeconds(playerItem.duration));
    }
  }else if([keyPath isEqualToString:@"loadedTimeRanges"]){
    NSArray *array=playerItem.loadedTimeRanges;
    CMTimeRange timeRange = [array.firstObject CMTimeRangevalue];//本次缓冲时间范围
    float startSeconds = CMTimeGetSeconds(timeRange.start);
    float durationSeconds = CMTimeGetSeconds(timeRange.duration);
    NSTimeInterval totalBuffer = startSeconds + durationSeconds;//缓冲总长度
    NSLog(@"共缓冲：%.2f",totalBuffer);
  }
}

- (void)playbackFinished:(NSNotification *)ntf {
  Plog(@"视频播放完成");
  [self.player seekToTime:CMTimeMake(0, 1)];
  [self.player play];
}

@end

另外微信下面的按钮长按会出现圆弧时间条：

m文件

#import "HProgressView.h"

@interface HProgressView ()


@property (nonatomic,assign)CGFloat progressValue;

@property (nonatomic, assign) CGFloat currentTime;

@end

@implementation HProgressView


// only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
  // Drawing code
  CGContextRef ctx = UIGraphicsGetCurrentContext();//获取上下文
  Plog(@"width = %f",self.frame.size.width);
  CGPoint center = CGPointMake(self.frame.size.width/2.0, self.frame.size.width/2.0); //设置圆心位置
  CGFloat radius = self.frame.size.width/2.0-5; //设置半径
  CGFloat startA = - M_PI_2; //圆起点位置
  CGFloat endA = -M_PI_2 + M_PI * 2 * _progressValue; //圆终点位置

  UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:startA endAngle:endA clockwise:YES];

  CGContextSetLineWidth(ctx, 10); //设置线条宽度
  [[UIColor whiteColor] setStroke]; //设置描边颜色

  CGContextAddPath(ctx, path.CGPath); //把路径添加到上下文

  CGContextStrokePath(ctx); //渲染
}

- (void)setTimeMax:(NSInteger)timeMax {
  _timeMax = timeMax;
  self.currentTime = 0;
  self.progressValue = 0;
  [self setNeedsDisplay];
  self.hidden = NO;
  [self performSelector:@selector(startProgress) withObject:nil afterDelay:0.1];
}

- (void)clearProgress {
  _currentTime = _timeMax;
  self.hidden = YES;
}

- (void)startProgress {
  _currentTime += 0.1;
  if (_timeMax > _currentTime) {
    _progressValue = _currentTime/_timeMax;
    Plog(@"progress = %f",_progressValue);
    [self setNeedsDisplay];
    [self performSelector:@selector(startProgress) withObject:nil afterDelay:0.1];
  }

  if (_timeMax <= _currentTime) {
    [self clearProgress];

  }
}

@end

接下来就是相机的控制器了，由于是临时写的，所以用的xib，大家不要直接使用，直接上m文件代码吧：

#import "HVideoViewController.h"
#import 
#import "HAVPlayer.h"
#import "HProgressView.h"
#import 
#import 

typedef void(^PropertyChangeBlock)(AVCaptureDevice *captureDevice);
@interface HVideoViewController ()

//轻触拍照，按住摄像
@property (strong, nonatomic) IBOutlet UILabel *labelTipTitle;

//视频输出流
@property (strong,nonatomic) AVCaptureMovieFileOutput *captureMovieFileOutput;
//图片输出流
//@property (strong,nonatomic) AVCaptureStillImageOutput *captureStillImageOutput;//照片输出流
//负责从AVCaptureDevice获得输入数据
@property (strong,nonatomic) AVCaptureDeviceInput *captureDeviceInput;
//后台任务标识
@property (assign,nonatomic) UIBackgroundTaskIdentifier backgroundTaskIdentifier;

@property (assign,nonatomic) UIBackgroundTaskIdentifier lastBackgroundTaskIdentifier;

@property (weak, nonatomic) IBOutlet UIImageView *focusCursor; //聚焦光标

//负责输入和输出设备之间的数据传递
@property(nonatomic)AVCaptureSession *session;

//图像预览层，实时显示捕获的图像
@property(nonatomic)AVCaptureVideoPreviewLayer *previewLayer;

@property (strong, nonatomic) IBOutlet UIButton *btnBack;
//重新录制
@property (strong, nonatomic) IBOutlet UIButton *btnAfresh;
//确定
@property (strong, nonatomic) IBOutlet UIButton *btnEnsure;
//摄像头切换
@property (strong, nonatomic) IBOutlet UIButton *btnCamera;

@property (strong, nonatomic) IBOutlet UIImageView *bgView;
//记录录制的时间 默认最大60秒
@property (assign, nonatomic) NSInteger seconds;

//记录需要保存视频的路径
@property (strong, nonatomic) NSURL *saveVideoUrl;

//是否在对焦
@property (assign, nonatomic) BOOL isFocus;
@property (strong, nonatomic) IBOutlet NSLayoutConstraint *afreshCenterX;
@property (strong, nonatomic) IBOutlet NSLayoutConstraint *ensureCenterX;
@property (strong, nonatomic) IBOutlet NSLayoutConstraint *backCenterX;

//视频播放
@property (strong, nonatomic) HAVPlayer *player;

@property (strong, nonatomic) IBOutlet HProgressView *progressView;

//是否是摄像 YES 代表是录制 NO 表示拍照
@property (assign, nonatomic) BOOL isVideo;

@property (strong, nonatomic) UIImage *takeImage;
@property (strong, nonatomic) UIImageView *takeImageView;
@property (strong, nonatomic) IBOutlet UIImageView *imgRecord;


@end

//时间大于这个就是视频，否则为拍照
#define TimeMax 1

@implementation HVideoViewController


-(void)dealloc{
  [self removeNotification];


}

- (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view.

  UIImage *image = [UIImage imageNamed:@"sc_btn_take.png"];
  self.backCenterX.constant = -(SCREEN_WIDTH/2/2)-image.size.width/2/2;

  self.progressView.layer.cornerRadius = self.progressView.frame.size.width/2;

  if (self.HSeconds == 0) {
    self.HSeconds = 60;
  }

  [self performSelector:@selector(hiddenTipsLabel) withObject:nil afterDelay:4];
}

- (void)hiddenTipsLabel {
  self.labelTipTitle.hidden = YES;
}

- (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
}

- (void)viewWillAppear:(BOOL)animated {
  [super viewWillAppear:animated];
  [[UIApplication sharedApplication] setStatusBarHidden:YES];
  [self customCamera];
  [self.session startRunning];
}


-(void)viewDidAppear:(BOOL)animated{
  [super viewDidAppear:animated];
}

-(void)viewDidDisappear:(BOOL)animated{
  [super viewDidDisappear:animated];
  [self.session stopRunning];
}

- (void)viewWillDisappear:(BOOL)animated {
  [super viewWillDisappear:animated];
  [[UIApplication sharedApplication] setStatusBarHidden:NO];
}

- (void)customCamera {

  //初始化会话，用来结合输入输出
  self.session = [[AVCaptureSession alloc] init];
  //设置分辨率 (设备支持的最高分辨率)
  if ([self.session canSetSessionPreset:AVCaptureSessionPresetHigh]) {
    self.session.sessionPreset = AVCaptureSessionPresetHigh;
  }
  //取得后置摄像头
  AVCaptureDevice *captureDevice = [self getCameraDeviceWithPosition:AVCaptureDevicePositionBack];
  //添加一个音频输入设备
  AVCaptureDevice *audioCaptureDevice=[[AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio] firstObject];

  //初始化输入设备
  NSError *error = nil;
  self.captureDeviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:captureDevice error:&error];
  if (error) {
    Plog(@"取得设备输入对象时出错，错误原因：%@",error.localizedDescription);
    return;
  }

  //添加音频
  error = nil;
  AVCaptureDeviceInput *audioCaptureDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:audioCaptureDevice error:&error];
  if (error) {
    NSLog(@"取得设备输入对象时出错，错误原因：%@",error.localizedDescription);
    return;
  }

  //输出对象
  self.captureMovieFileOutput = [[AVCaptureMovieFileOutput alloc] init];//视频输出

  //将输入设备添加到会话
  if ([self.session canAddInput:self.captureDeviceInput]) {
    [self.session addInput:self.captureDeviceInput];
    [self.session addInput:audioCaptureDeviceInput];
    //设置视频防抖
    AVCaptureConnection *connection = [self.captureMovieFileOutput connectionWithMediaType:AVMediaTypeVideo];
    if ([connection isVideoStabilizationSupported]) {
      connection.preferredVideoStabilizationMode = AVCaptureVideoStabilizationModeCinematic;
    }
  }

  //将输出设备添加到会话 (刚开始 是照片为输出对象)
  if ([self.session canAddOutput:self.captureMovieFileOutput]) {
    [self.session addOutput:self.captureMovieFileOutput];
  }

  //创建视频预览层，用于实时展示摄像头状态
  self.previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];
  self.previewLayer.frame = self.view.bounds;//CGRectMake(0, 0, self.view.width, self.view.height);
  self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;//填充模式
  [self.bgView.layer addSublayer:self.previewLayer];

  [self addNotificationToCaptureDevice:captureDevice];
  [self addGenstureRecognizer];
}



- (IBAction)onCancelAction:(UIButton *)sender {
  [self dismissViewControllerAnimated:YES completion:^{
    [Utility hideProgressDialog];
  }];
}


- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
  if ([[touches anyObject] view] == self.imgRecord) {
    Plog(@"开始录制");
    //根据设备输出获得连接
    AVCaptureConnection *connection = [self.captureMovieFileOutput connectionWithMediaType:AVMediaTypeAudio];
    //根据连接取得设备输出的数据
    if (![self.captureMovieFileOutput isRecording]) {
      //如果支持多任务则开始多任务
      if ([[UIDevice currentDevice] isMultitaskingSupported]) {
 self.backgroundTaskIdentifier = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil];
      }
      if (self.saveVideoUrl) {
 [[NSFileManager defaultManager] removeItemAtURL:self.saveVideoUrl error:nil];
      }
      //预览图层和视频方向保持一致
      connection.videoOrientation = [self.previewLayer connection].videoOrientation;
      NSString *outputFielPath=[NSTemporaryDirectory() stringByAppendingString:@"myMovie.mov"];
      NSLog(@"save path is :%@",outputFielPath);
      NSURL *fileUrl=[NSURL fileURLWithPath:outputFielPath];
      NSLog(@"fileUrl:%@",fileUrl);
      [self.captureMovieFileOutput startRecordingToOutputFileURL:fileUrl recordingDelegate:self];
    } else {
      [self.captureMovieFileOutput stopRecording];
    }
  }
}


- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
  if ([[touches anyObject] view] == self.imgRecord) {
    Plog(@"结束触摸");
    if (!self.isVideo) {
      [self performSelector:@selector(endRecord) withObject:nil afterDelay:0.3];
    } else {
      [self endRecord];
    }
  }
}

- (void)endRecord {
  [self.captureMovieFileOutput stopRecording];//停止录制
}

- (IBAction)onAfreshAction:(UIButton *)sender {
  Plog(@"重新录制");
  [self recoverLayout];
}

- (IBAction)onEnsureAction:(UIButton *)sender {
  Plog(@"确定 这里进行保存或者发送出去");
  if (self.saveVideoUrl) {
    WS(weakSelf)
    [Utility showProgressDialogText:@"视频处理中..."];
    ALAssetsLibrary *assetsLibrary=[[ALAssetsLibrary alloc]init];
    [assetsLibrary writeVideoAtPathToSavedPhotosAlbum:self.saveVideoUrl completionBlock:^(NSURL *assetURL, NSError *error) {
      Plog(@"outputUrl:%@",weakSelf.saveVideoUrl);
      [[NSFileManager defaultManager] removeItemAtURL:weakSelf.saveVideoUrl error:nil];
      if (weakSelf.lastBackgroundTaskIdentifier!= UIBackgroundTaskInvalid) {
 [[UIApplication sharedApplication] endBackgroundTask:weakSelf.lastBackgroundTaskIdentifier];
      }
      if (error) {
 Plog(@"保存视频到相簿过程中发生错误，错误信息：%@",error.localizedDescription);
 [Utility showAllTextDialog:KAppDelegate.window Text:@"保存视频到相册发生错误"];
      } else {
 if (weakSelf.takeBlock) {
   weakSelf.takeBlock(assetURL);
 }
 Plog(@"成功保存视频到相簿.");
 [weakSelf onCancelAction:nil];
      }
    }];
  } else {
    //照片
    UIImageWriteToSavedPhotosAlbum(self.takeImage, self, nil, nil);
    if (self.takeBlock) {
      self.takeBlock(self.takeImage);
    }

    [self onCancelAction:nil];
  }
}

//前后摄像头的切换
- (IBAction)onCameraAction:(UIButton *)sender {
  Plog(@"切换摄像头");
  AVCaptureDevice *currentDevice=[self.captureDeviceInput device];
  AVCaptureDevicePosition currentPosition=[currentDevice position];
  [self removeNotificationFromCaptureDevice:currentDevice];
  AVCaptureDevice *toChangeDevice;
  AVCaptureDevicePosition toChangePosition = AVCaptureDevicePositionFront;//前
  if (currentPosition == AVCaptureDevicePositionUnspecified || currentPosition == AVCaptureDevicePositionFront) {
    toChangePosition = AVCaptureDevicePositionBack;//后
  }
  toChangeDevice=[self getCameraDeviceWithPosition:toChangePosition];
  [self addNotificationToCaptureDevice:toChangeDevice];
  //获得要调整的设备输入对象
  AVCaptureDeviceInput *toChangeDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:toChangeDevice error:nil];

  //改变会话的配置前一定要先开启配置，配置完成后提交配置改变
  [self.session beginConfiguration];
  //移除原有输入对象
  [self.session removeInput:self.captureDeviceInput];
  //添加新的输入对象
  if ([self.session canAddInput:toChangeDeviceInput]) {
    [self.session addInput:toChangeDeviceInput];
    self.captureDeviceInput = toChangeDeviceInput;
  }
  //提交会话配置
  [self.session commitConfiguration];
}

- (void)onStartTranscribe:(NSURL *)fileURL {
  if ([self.captureMovieFileOutput isRecording]) {
    -- self.seconds;
    if (self.seconds > 0) {
      if (self.HSeconds - self.seconds >= TimeMax && !self.isVideo) {
 self.isVideo = YES;//长按时间超过TimeMax 表示是视频录制
 self.progressView.timeMax = self.seconds;
      }
      [self performSelector:@selector(onStartTranscribe:) withObject:fileURL afterDelay:1.0];
    } else {
      if ([self.captureMovieFileOutput isRecording]) {
 [self.captureMovieFileOutput stopRecording];
      }
    }
  }
}


#pragma mark - 视频输出代理
-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:(NSArray *)connections{
  Plog(@"开始录制...");
  self.seconds = self.HSeconds;
  [self performSelector:@selector(onStartTranscribe:) withObject:fileURL afterDelay:1.0];
}


-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error{
  Plog(@"视频录制完成.");
  [self changeLayout];
  if (self.isVideo) {
    self.saveVideoUrl = outputFileURL;
    if (!self.player) {
      self.player = [[HAVPlayer alloc] initWithframe:self.bgView.bounds withShowInView:self.bgView url:outputFileURL];
    } else {
      if (outputFileURL) {
 self.player.videoUrl = outputFileURL;
 self.player.hidden = NO;
      }
    }
  } else {
    //照片
    self.saveVideoUrl = nil;
    [self videoHandlePhoto:outputFileURL];
  }

}

- (void)videoHandlePhoto:(NSURL *)url {
  AVURLAsset *urlSet = [AVURLAsset assetWithURL:url];
  AVAssetImageGenerator *imageGenerator = [AVAssetImageGenerator assetImageGeneratorWithAsset:urlSet];
  imageGenerator.appliesPreferredTrackTransform = YES;  // 截图的时候调整到正确的方向
  NSError *error = nil;
  CMTime time = CMTimeMake(0,30);//缩略图创建时间 CMTime是表示电影时间信息的结构体，第一个参数表示是视频第几秒，第二个参数表示每秒帧数.(如果要获取某一秒的第几帧可以使用CMTimeMake方法)
  CMTime actucalTime; //缩略图实际生成的时间
  CGImageRef cgImage = [imageGenerator copyCGImageAtTime:time actualTime:&actucalTime error:&error];
  if (error) {
    Plog(@"截取视频图片失败:%@",error.localizedDescription);
  }
  CMTimeShow(actucalTime);
  UIImage *image = [UIImage imageWithCGImage:cgImage];

  CGImageRelease(cgImage);
  if (image) {
    Plog(@"视频截取成功");
  } else {
    Plog(@"视频截取失败");
  }


  self.takeImage = image;//[UIImage imageWithCGImage:cgImage];

  [[NSFileManager defaultManager] removeItemAtURL:url error:nil];

  if (!self.takeImageView) {
    self.takeImageView = [[UIImageView alloc] initWithframe:self.view.frame];
    [self.bgView addSubview:self.takeImageView];
  }
  self.takeImageView.hidden = NO;
  self.takeImageView.image = self.takeImage;
}

#pragma mark - 通知

//注册通知
- (void)setupObservers
{
  NSNotificationCenter *notification = [NSNotificationCenter defaultCenter];
  [notification addObserver:self selector:@selector(applicationDidEnterBackground:) name:UIApplicationWillResignActiveNotification object:[UIApplication sharedApplication]];
}

//进入后台就退出视频录制
- (void)applicationDidEnterBackground:(NSNotification *)notification {
  [self onCancelAction:nil];
}


-(void)addNotificationToCaptureDevice:(AVCaptureDevice *)captureDevice{
  //注意添加区域改变捕获通知必须首先设置设备允许捕获
  [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
    captureDevice.subjectAreaChangeMonitoringEnabled=YES;
  }];
  NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
  //捕获区域发生改变
  [notificationCenter addObserver:self selector:@selector(areaChange:) name:AVCaptureDeviceSubjectAreaDidChangeNotification object:captureDevice];
}
-(void)removeNotificationFromCaptureDevice:(AVCaptureDevice *)captureDevice{
  NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
  [notificationCenter removeObserver:self name:AVCaptureDeviceSubjectAreaDidChangeNotification object:captureDevice];
}

-(void)removeNotification{
  NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
  [notificationCenter removeObserver:self];
}

-(void)addNotificationToCaptureSession:(AVCaptureSession *)captureSession{
  NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
  //会话出错
  [notificationCenter addObserver:self selector:@selector(sessionRuntimeError:) name:AVCaptureSessionRuntimeErrorNotification object:captureSession];
}


-(void)deviceConnected:(NSNotification *)notification{
  NSLog(@"设备已连接...");
}

-(void)deviceDisconnected:(NSNotification *)notification{
  NSLog(@"设备已断开.");
}

-(void)areaChange:(NSNotification *)notification{
  NSLog(@"捕获区域改变...");
}


-(void)sessionRuntimeError:(NSNotification *)notification{
  NSLog(@"会话发生错误.");
}




-(AVCaptureDevice *)getCameraDeviceWithPosition:(AVCaptureDevicePosition )position{
  NSArray *cameras= [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
  for (AVCaptureDevice *camera in cameras) {
    if ([camera position] == position) {
      return camera;
    }
  }
  return nil;
}


-(void)changeDeviceProperty:(PropertyChangeBlock)propertyChange{
  AVCaptureDevice *captureDevice= [self.captureDeviceInput device];
  NSError *error;
  //注意改变设备属性前一定要首先调用lockForConfiguration:调用完之后使用unlockForConfiguration方法解锁
  if ([captureDevice lockForConfiguration:&error]) {
    //自动白平衡
    if ([captureDevice isWhiteBalanceModeSupported:AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance]) {
      [captureDevice setWhiteBalanceMode:AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance];
    }
    //自动根据环境条件开启闪光灯
    if ([captureDevice isFlashModeSupported:AVCaptureFlashModeAuto]) {
      [captureDevice setFlashMode:AVCaptureFlashModeAuto];
    }

    propertyChange(captureDevice);
    [captureDevice unlockForConfiguration];
  }else{
    NSLog(@"设置设备属性过程发生错误，错误信息：%@",error.localizedDescription);
  }
}


-(void)setFlashMode:(AVCaptureFlashMode )flashMode{
  [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
    if ([captureDevice isFlashModeSupported:flashMode]) {
      [captureDevice setFlashMode:flashMode];
    }
  }];
}

-(void)setFocusMode:(AVCaptureFocusMode )focusMode{
  [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
    if ([captureDevice isFocusModeSupported:focusMode]) {
      [captureDevice setFocusMode:focusMode];
    }
  }];
}

-(void)setExposureMode:(AVCaptureExposureMode)exposureMode{
  [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
    if ([captureDevice isExposureModeSupported:exposureMode]) {
      [captureDevice setExposureMode:exposureMode];
    }
  }];
}

-(void)focusWithMode:(AVCaptureFocusMode)focusMode exposureMode:(AVCaptureExposureMode)exposureMode atPoint:(CGPoint)point{
  [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
//    if ([captureDevice isFocusPointOfInterestSupported]) {
//      [captureDevice setFocusPointOfInterest:point];
//    }
//    if ([captureDevice isExposurePointOfInterestSupported]) {
//      [captureDevice setExposurePointOfInterest:point];
//    }
    if ([captureDevice isExposureModeSupported:exposureMode]) {
      [captureDevice setExposureMode:exposureMode];
    }
    if ([captureDevice isFocusModeSupported:focusMode]) {
      [captureDevice setFocusMode:focusMode];
    }
  }];
}


-(void)addGenstureRecognizer{
  UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapScreen:)];
  [self.bgView addGestureRecognizer:tapGesture];
}

-(void)tapScreen:(UITapGestureRecognizer *)tapGesture{
  if ([self.session isRunning]) {
    CGPoint point= [tapGesture locationInView:self.bgView];
    //将UI坐标转化为摄像头坐标
    CGPoint cameraPoint= [self.previewLayer captureDevicePointOfInterestForPoint:point];
    [self setFocusCursorWithPoint:point];
    [self focusWithMode:AVCaptureFocusModeContinuousAutoFocus exposureMode:AVCaptureExposureModeContinuousAutoExposure atPoint:cameraPoint];
  }
}


-(void)setFocusCursorWithPoint:(CGPoint)point{
  if (!self.isFocus) {
    self.isFocus = YES;
    self.focusCursor.center=point;
    self.focusCursor.transform = CGAffineTransformMakeScale(1.25, 1.25);
    self.focusCursor.alpha = 1.0;
    [UIView animateWithDuration:0.5 animations:^{
      self.focusCursor.transform = CGAffineTransformIdentity;
    } completion:^(BOOL finished) {
      [self performSelector:@selector(onHiddenFocusCurSorAction) withObject:nil afterDelay:0.5];
    }];
  }
}

- (void)onHiddenFocusCurSorAction {
  self.focusCursor.alpha=0;
  self.isFocus = NO;
}

//拍摄完成时调用
- (void)changeLayout {
  self.imgRecord.hidden = YES;
  self.btnCamera.hidden = YES;
  self.btnAfresh.hidden = NO;
  self.btnEnsure.hidden = NO;
  self.btnBack.hidden = YES;
  if (self.isVideo) {
    [self.progressView clearProgress];
  }
  self.afreshCenterX.constant = -(SCREEN_WIDTH/2/2);
  self.ensureCenterX.constant = SCREEN_WIDTH/2/2;
  [UIView animateWithDuration:0.25 animations:^{
    [self.view layoutIfNeeded];
  }];

  self.lastBackgroundTaskIdentifier = self.backgroundTaskIdentifier;
  self.backgroundTaskIdentifier = UIBackgroundTaskInvalid;
  [self.session stopRunning];
}


//重新拍摄时调用
- (void)recoverLayout {
  if (self.isVideo) {
    self.isVideo = NO;
    [self.player stopPlayer];
    self.player.hidden = YES;
  }
  [self.session startRunning];

  if (!self.takeImageView.hidden) {
    self.takeImageView.hidden = YES;
  }
//  self.saveVideoUrl = nil;
  self.afreshCenterX.constant = 0;
  self.ensureCenterX.constant = 0;
  self.imgRecord.hidden = NO;
  self.btnCamera.hidden = NO;
  self.btnAfresh.hidden = YES;
  self.btnEnsure.hidden = YES;
  self.btnBack.hidden = NO;
  [UIView animateWithDuration:0.25 animations:^{
    [self.view layoutIfNeeded];
  }];
}



@end

使用也挺简单：

- (IBAction)onCameraAction:(UIButton *)sender {
  //额 。。由于是demo,所以用的xib，大家根据需求自己更改，该demo只是提供一个思路，使用时不要直接拖入项目
  HVideoViewController *ctrl = [[NSBundle mainBundle] loadNibNamed:@"HVideoViewController" owner:nil options:nil].lastObject;
  ctrl.HSeconds = 30;//设置可录制最长时间
  ctrl.takeBlock = ^(id item) {
    if ([item isKindOfClass:[NSURL class]]) {
      NSURL *videoURL = item;
      //视频url

    } else {
      //图片

    }
  };
  [self presentViewController:ctrl animated:YES completion:nil];
}

demo地址也给出来吧：iosCamera_jb51.rar

自此就结束啦，写的比较简单，希望能帮助到大家，谢谢！

x效果图也帖出来吧：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。