iOS开发-自定义相机（仿微信）拍照、视频录制

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 <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：不喜勿碰-_-\
https://github.com/hkjin/KJCamera

自此就结束啦，写的比较简单，希望能帮助到大家，谢谢！