这篇文章主要为大家展示了“iOS如何实现自定义相机”，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起研究并学习一下“iOS如何实现自定义相机”这篇文章吧。
用到了下面几个库：
#import <AVFoundation/AVFoundation.h> #import <AssetsLibrary/AssetsLibrary.h>
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 <AVFoundation/AVFoundation.h> @interface HAVPlayer () @property (nonatomic,strong) AVPlayer *player;//播放器对象 @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]) { //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 } } /** * 通过KVO监控播放器状态 * * @param keyPath 监控属性 * @param object 监视器 * @param change 状态改变 * @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...，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 () /** * 进度值0-1.0之间 */ @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 <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> //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<UITouch *> *)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<UITouch *> *)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]; } /** * 给输入设备添加通知 */ -(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]; } /** * 移除所有通知 */ -(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]; } /** * 设备连接成功 * * @param notification 通知对象 */ -(void)deviceConnected:(NSNotification *)notification{ NSLog(@"设备已连接..."); } /** * 设备连接断开 * * @param notification 通知对象 */ -(void)deviceDisconnected:(NSNotification *)notification{ NSLog(@"设备已断开."); } /** * 捕获区域改变 * * @param notification 通知对象 */ -(void)areaChange:(NSNotification *)notification{ NSLog(@"捕获区域改变..."); } /** * 会话出错 * * @param notification 通知对象 */ -(void)sessionRuntimeError:(NSNotification *)notification{ NSLog(@"会话发生错误."); } /** * 取得指定位置的摄像头 * * @param position 摄像头位置 * * @return 摄像头设备 */ -(AVCaptureDevice *)getCameraDeviceWithPosition:(AVCaptureDevicePosition )position{ NSArray *cameras= [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]; for (AVCaptureDevice *camera in cameras) { if ([camera position] == position) { return camera; } } return nil; } /** * 改变设备属性的统一操作方法 * * @param propertyChange 属性改变操作 */ -(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); } } /** * 设置闪光灯模式 * * @param flashMode 闪光灯模式 */ -(void)setFlashMode:(AVCaptureFlashMode )flashMode{ [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) { if ([captureDevice isFlashModeSupported:flashMode]) { [captureDevice setFlashMode:flashMode]; } }]; } /** * 设置聚焦模式 * * @param focusMode 聚焦模式 */ -(void)setFocusMode:(AVCaptureFocusMode )focusMode{ [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) { if ([captureDevice isFocusModeSupported:focusMode]) { [captureDevice setFocusMode:focusMode]; } }]; } /** * 设置曝光模式 * * @param exposureMode 曝光模式 */ -(void)setExposureMode:(AVCaptureExposureMode)exposureMode{ [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) { if ([captureDevice isExposureModeSupported:exposureMode]) { [captureDevice setExposureMode:exposureMode]; } }]; } /** * 设置聚焦点 * * @param point 聚焦点 */ -(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]; } }]; } /** * 添加点按手势，点按时聚焦 */ -(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]; //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]; } } /** * 设置聚焦光标位置 * * @param point 光标位置 */ -(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]; }]; } /* #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：
以上是“iOS如何实现自定义相机”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注亿速云行业资讯频道！
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