iOS如何實現自定義相機

這篇文章主要為大家展示了“iOS如何實現自定義相機”，內容簡而易懂，條理清晰，希望能夠幫助大家解決疑惑，下面讓小編帶領大家一起研究并學習一下“iOS如何實現自定義相機”這篇文章吧。

用到了下面幾個庫：

#import <AVFoundation/AVFoundation.h>
#import <AssetsLibrary/AssetsLibrary.h>

在使用的時候需要在Info.plist中把相關權限寫進去：

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

我在寫這個demo時，是按照微信的樣式寫的，同樣是點擊拍照、長按錄制視頻，視頻錄制完直接進行播放，這里封裝了一個簡易的播放器：

m文件

#import "HAVPlayer.h"
#import <AVFoundation/AVFoundation.h>

@interface HAVPlayer ()

@property (nonatomic,strong) AVPlayer *player;//播放器對象

@end

@implementation HAVPlayer

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
  // Drawing code
}
*/

- (instancetype)initWithFrame:(CGRect)frame withShowInView:(UIView *)bgView url:(NSURL *)url {
  if (self = [self initWithFrame:frame]) {
    //創建播放器層
    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 {
  //監控狀態屬性
  [playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];
  //監控網絡加載情況屬性
  [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];//如果在播放狀態就停止
  }
}

/**
 * 通過KVO監控播放器狀態
 *
 * @param keyPath 監控屬性
 * @param object 監視器
 * @param change 狀態改變
 * @param context 上下文
 */
-(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...，視頻總長度:%.2f",CMTimeGetSeconds(playerItem.duration));
    }
  }else if([keyPath isEqualToString:@"loadedTimeRanges"]){
    NSArray *array=playerItem.loadedTimeRanges;
    CMTimeRange timeRange = [array.firstObject CMTimeRangeValue];//本次緩沖時間范圍
    float startSeconds = CMTimeGetSeconds(timeRange.start);
    float durationSeconds = CMTimeGetSeconds(timeRange.duration);
    NSTimeInterval totalBuffer = startSeconds + durationSeconds;//緩沖總長度
    NSLog(@"共緩沖：%.2f",totalBuffer);
  }
}

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

@end

另外微信下面的按鈕長按會出現圓弧時間條：

m文件

#import "HProgressView.h"

@interface HProgressView ()

/**
 * 進度值0-1.0之間
 */
@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();//獲取上下文
  Plog(@"width = %f",self.frame.size.width);
  CGPoint center = CGPointMake(self.frame.size.width/2.0, self.frame.size.width/2.0); //設置圓心位置
  CGFloat radius = self.frame.size.width/2.0-5; //設置半徑
  CGFloat startA = - M_PI_2; //圓起點位置
  CGFloat endA = -M_PI_2 + M_PI * 2 * _progressValue; //圓終點位置

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

  CGContextSetLineWidth(ctx, 10); //設置線條寬度
  [[UIColor whiteColor] setStroke]; //設置描邊顏色

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

  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

接下來就是相機的控制器了，由于是臨時寫的，所以用的xib，大家不要直接使用，直接上m文件代碼吧：

#import "HVideoViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "HAVPlayer.h"
#import "HProgressView.h"
#import <Foundation/Foundation.h>
#import <AssetsLibrary/AssetsLibrary.h>

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

//輕觸拍照，按住攝像
@property (strong, nonatomic) IBOutlet UILabel *labelTipTitle;

//視頻輸出流
@property (strong,nonatomic) AVCaptureMovieFileOutput *captureMovieFileOutput;
//圖片輸出流
//@property (strong,nonatomic) AVCaptureStillImageOutput *captureStillImageOutput;//照片輸出流
//負責從AVCaptureDevice獲得輸入數據
@property (strong,nonatomic) AVCaptureDeviceInput *captureDeviceInput;
//后臺任務標識
@property (assign,nonatomic) UIBackgroundTaskIdentifier backgroundTaskIdentifier;

@property (assign,nonatomic) UIBackgroundTaskIdentifier lastBackgroundTaskIdentifier;

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

//負責輸入和輸出設備之間的數據傳遞
@property(nonatomic)AVCaptureSession *session;

//圖像預覽層，實時顯示捕獲的圖像
@property(nonatomic)AVCaptureVideoPreviewLayer *previewLayer;

@property (strong, nonatomic) IBOutlet UIButton *btnBack;
//重新錄制
@property (strong, nonatomic) IBOutlet UIButton *btnAfresh;
//確定
@property (strong, nonatomic) IBOutlet UIButton *btnEnsure;
//攝像頭切換
@property (strong, nonatomic) IBOutlet UIButton *btnCamera;

@property (strong, nonatomic) IBOutlet UIImageView *bgView;
//記錄錄制的時間 默認最大60秒
@property (assign, nonatomic) NSInteger seconds;

//記錄需要保存視頻的路徑
@property (strong, nonatomic) NSURL *saveVideoUrl;

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

//視頻播放
@property (strong, nonatomic) HAVPlayer *player;

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

//是否是攝像 YES 代表是錄制 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

//時間大于這個就是視頻，否則為拍照
#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 {

  //初始化會話，用來結合輸入輸出
  self.session = [[AVCaptureSession alloc] init];
  //設置分辨率 (設備支持的最高分辨率)
  if ([self.session canSetSessionPreset:AVCaptureSessionPresetHigh]) {
    self.session.sessionPreset = AVCaptureSessionPresetHigh;
  }
  //取得后置攝像頭
  AVCaptureDevice *captureDevice = [self getCameraDeviceWithPosition:AVCaptureDevicePositionBack];
  //添加一個音頻輸入設備
  AVCaptureDevice *audioCaptureDevice=[[AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio] firstObject];

  //初始化輸入設備
  NSError *error = nil;
  self.captureDeviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:captureDevice error:&error];
  if (error) {
    Plog(@"取得設備輸入對象時出錯，錯誤原因：%@",error.localizedDescription);
    return;
  }

  //添加音頻
  error = nil;
  AVCaptureDeviceInput *audioCaptureDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:audioCaptureDevice error:&error];
  if (error) {
    NSLog(@"取得設備輸入對象時出錯，錯誤原因：%@",error.localizedDescription);
    return;
  }

  //輸出對象
  self.captureMovieFileOutput = [[AVCaptureMovieFileOutput alloc] init];//視頻輸出

  //將輸入設備添加到會話
  if ([self.session canAddInput:self.captureDeviceInput]) {
    [self.session addInput:self.captureDeviceInput];
    [self.session addInput:audioCaptureDeviceInput];
    //設置視頻防抖
    AVCaptureConnection *connection = [self.captureMovieFileOutput connectionWithMediaType:AVMediaTypeVideo];
    if ([connection isVideoStabilizationSupported]) {
      connection.preferredVideoStabilizationMode = AVCaptureVideoStabilizationModeCinematic;
    }
  }

  //將輸出設備添加到會話 (剛開始 是照片為輸出對象)
  if ([self.session canAddOutput:self.captureMovieFileOutput]) {
    [self.session addOutput:self.captureMovieFileOutput];
  }

  //創建視頻預覽層，用于實時展示攝像頭狀態
  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<UITouch *> *)touches withEvent:(UIEvent *)event {
  if ([[touches anyObject] view] == self.imgRecord) {
    Plog(@"開始錄制");
    //根據設備輸出獲得連接
    AVCaptureConnection *connection = [self.captureMovieFileOutput connectionWithMediaType:AVMediaTypeAudio];
    //根據連接取得設備輸出的數據
    if (![self.captureMovieFileOutput isRecording]) {
      //如果支持多任務則開始多任務
      if ([[UIDevice currentDevice] isMultitaskingSupported]) {
        self.backgroundTaskIdentifier = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil];
      }
      if (self.saveVideoUrl) {
        [[NSFileManager defaultManager] removeItemAtURL:self.saveVideoUrl error:nil];
      }
      //預覽圖層和視頻方向保持一致
      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<UITouch *> *)touches withEvent:(UIEvent *)event {
  if ([[touches anyObject] view] == self.imgRecord) {
    Plog(@"結束觸摸");
    if (!self.isVideo) {
      [self performSelector:@selector(endRecord) withObject:nil afterDelay:0.3];
    } else {
      [self endRecord];
    }
  }
}

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

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

- (IBAction)onEnsureAction:(UIButton *)sender {
  Plog(@"確定 這里進行保存或者發送出去");
  if (self.saveVideoUrl) {
    WS(weakSelf)
    [Utility showProgressDialogText:@"視頻處理中..."];
    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(@"保存視頻到相簿過程中發生錯誤，錯誤信息：%@",error.localizedDescription);
        [Utility showAllTextDialog:KAppDelegate.window Text:@"保存視頻到相冊發生錯誤"];
      } else {
        if (weakSelf.takeBlock) {
          weakSelf.takeBlock(assetURL);
        }
        Plog(@"成功保存視頻到相簿.");
        [weakSelf onCancelAction:nil];
      }
    }];
  } else {
    //照片
    UIImageWriteToSavedPhotosAlbum(self.takeImage, self, nil, nil);
    if (self.takeBlock) {
      self.takeBlock(self.takeImage);
    }

    [self onCancelAction:nil];
  }
}

//前后攝像頭的切換
- (IBAction)onCameraAction:(UIButton *)sender {
  Plog(@"切換攝像頭");
  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];
  //獲得要調整的設備輸入對象
  AVCaptureDeviceInput *toChangeDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:toChangeDevice error:nil];

  //改變會話的配置前一定要先開啟配置，配置完成后提交配置改變
  [self.session beginConfiguration];
  //移除原有輸入對象
  [self.session removeInput:self.captureDeviceInput];
  //添加新的輸入對象
  if ([self.session canAddInput:toChangeDeviceInput]) {
    [self.session addInput:toChangeDeviceInput];
    self.captureDeviceInput = toChangeDeviceInput;
  }
  //提交會話配置
  [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;//長按時間超過TimeMax 表示是視頻錄制
        self.progressView.timeMax = self.seconds;
      }
      [self performSelector:@selector(onStartTranscribe:) withObject:fileURL afterDelay:1.0];
    } else {
      if ([self.captureMovieFileOutput isRecording]) {
        [self.captureMovieFileOutput stopRecording];
      }
    }
  }
}


#pragma mark - 視頻輸出代理
-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:(NSArray *)connections{
  Plog(@"開始錄制...");
  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(@"視頻錄制完成.");
  [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;  // 截圖的時候調整到正確的方向
  NSError *error = nil;
  CMTime time = CMTimeMake(0,30);//縮略圖創建時間 CMTime是表示電影時間信息的結構體，第一個參數表示是視頻第幾秒，第二個參數表示每秒幀數.(如果要獲取某一秒的第幾幀可以使用CMTimeMake方法)
  CMTime actucalTime; //縮略圖實際生成的時間
  CGImageRef cgImage = [imageGenerator copyCGImageAtTime:time actualTime:&actucalTime error:&error];
  if (error) {
    Plog(@"截取視頻圖片失敗:%@",error.localizedDescription);
  }
  CMTimeShow(actucalTime);
  UIImage *image = [UIImage imageWithCGImage:cgImage];

  CGImageRelease(cgImage);
  if (image) {
    Plog(@"視頻截取成功");
  } else {
    Plog(@"視頻截取失敗");
  }


  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

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

//進入后臺就退出視頻錄制
- (void)applicationDidEnterBackground:(NSNotification *)notification {
  [self onCancelAction:nil];
}

/**
 * 給輸入設備添加通知
 */
-(void)addNotificationToCaptureDevice:(AVCaptureDevice *)captureDevice{
  //注意添加區域改變捕獲通知必須首先設置設備允許捕獲
  [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
    captureDevice.subjectAreaChangeMonitoringEnabled=YES;
  }];
  NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
  //捕獲區域發生改變
  [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];
}
/**
 * 移除所有通知
 */
-(void)removeNotification{
  NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
  [notificationCenter removeObserver:self];
}

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

/**
 * 設備連接成功
 *
 * @param notification 通知對象
 */
-(void)deviceConnected:(NSNotification *)notification{
  NSLog(@"設備已連接...");
}
/**
 * 設備連接斷開
 *
 * @param notification 通知對象
 */
-(void)deviceDisconnected:(NSNotification *)notification{
  NSLog(@"設備已斷開.");
}
/**
 * 捕獲區域改變
 *
 * @param notification 通知對象
 */
-(void)areaChange:(NSNotification *)notification{
  NSLog(@"捕獲區域改變...");
}

/**
 * 會話出錯
 *
 * @param notification 通知對象
 */
-(void)sessionRuntimeError:(NSNotification *)notification{
  NSLog(@"會話發生錯誤.");
}



/**
 * 取得指定位置的攝像頭
 *
 * @param position 攝像頭位置
 *
 * @return 攝像頭設備
 */
-(AVCaptureDevice *)getCameraDeviceWithPosition:(AVCaptureDevicePosition )position{
  NSArray *cameras= [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
  for (AVCaptureDevice *camera in cameras) {
    if ([camera position] == position) {
      return camera;
    }
  }
  return nil;
}

/**
 * 改變設備屬性的統一操作方法
 *
 * @param propertyChange 屬性改變操作
 */
-(void)changeDeviceProperty:(PropertyChangeBlock)propertyChange{
  AVCaptureDevice *captureDevice= [self.captureDeviceInput device];
  NSError *error;
  //注意改變設備屬性前一定要首先調用lockForConfiguration:調用完之后使用unlockForConfiguration方法解鎖
  if ([captureDevice lockForConfiguration:&error]) {
    //自動白平衡
    if ([captureDevice isWhiteBalanceModeSupported:AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance]) {
      [captureDevice setWhiteBalanceMode:AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance];
    }
    //自動根據環境條件開啟閃光燈
    if ([captureDevice isFlashModeSupported:AVCaptureFlashModeAuto]) {
      [captureDevice setFlashMode:AVCaptureFlashModeAuto];
    }

    propertyChange(captureDevice);
    [captureDevice unlockForConfiguration];
  }else{
    NSLog(@"設置設備屬性過程發生錯誤，錯誤信息：%@",error.localizedDescription);
  }
}

/**
 * 設置閃光燈模式
 *
 * @param flashMode 閃光燈模式
 */
-(void)setFlashMode:(AVCaptureFlashMode )flashMode{
  [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
    if ([captureDevice isFlashModeSupported:flashMode]) {
      [captureDevice setFlashMode:flashMode];
    }
  }];
}
/**
 * 設置聚焦模式
 *
 * @param focusMode 聚焦模式
 */
-(void)setFocusMode:(AVCaptureFocusMode )focusMode{
  [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
    if ([captureDevice isFocusModeSupported:focusMode]) {
      [captureDevice setFocusMode:focusMode];
    }
  }];
}
/**
 * 設置曝光模式
 *
 * @param exposureMode 曝光模式
 */
-(void)setExposureMode:(AVCaptureExposureMode)exposureMode{
  [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
    if ([captureDevice isExposureModeSupported:exposureMode]) {
      [captureDevice setExposureMode:exposureMode];
    }
  }];
}
/**
 * 設置聚焦點
 *
 * @param point 聚焦點
 */
-(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];
    }
  }];
}

/**
 * 添加點按手勢，點按時聚焦
 */
-(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];
    //將UI坐標轉化為攝像頭坐標
    CGPoint cameraPoint= [self.previewLayer captureDevicePointOfInterestForPoint:point];
    [self setFocusCursorWithPoint:point];
    [self focusWithMode:AVCaptureFocusModeContinuousAutoFocus exposureMode:AVCaptureExposureModeContinuousAutoExposure atPoint:cameraPoint];
  }
}

/**
 * 設置聚焦光標位置
 *
 * @param point 光標位置
 */
-(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;
}

//拍攝完成時調用
- (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];
}


//重新拍攝時調用
- (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];
  }];
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
  // Get the new view controller using [segue destinationViewController].
  // Pass the selected object to the new view controller.
}
*/

@end

使用也挺簡單：

- (IBAction)onCameraAction:(UIButton *)sender {
  //額 。。由于是demo,所以用的xib，大家根據需求自己更改，該demo只是提供一個思路，使用時不要直接拖入項目
  HVideoViewController *ctrl = [[NSBundle mainBundle] loadNibNamed:@"HVideoViewController" owner:nil options:nil].lastObject;
  ctrl.HSeconds = 30;//設置可錄制最長時間
  ctrl.takeBlock = ^(id item) {
    if ([item isKindOfClass:[NSURL class]]) {
      NSURL *videoURL = item;
      //視頻url

    } else {
      //圖片

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

demo地址也給出來吧：iosCamera_jb51.rar

自此就結束啦，寫的比較簡單，希望能幫助到大家，謝謝！

x效果圖也帖出來吧：

以上是“iOS如何實現自定義相機”這篇文章的所有內容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內容對大家有所幫助，如果還想學習更多知識，歡迎關注億速云行業資訊頻道！