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 <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.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服务器之家。

原文链接：http://www.jianshu.com/p/5e3452b1c140#