用系统自带的视听媒体的框架，avfoundation实现照片拍摄。相比uikit框架（uiimagepickercontroller高度封装），avfoundation框架让开发者有更大的发挥空间。
首先看一下效果图：
下面贴上核心控制器代码：
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#import "hwphotovc.h"#import <avfoundation/avfoundation.h> @interface hwphotovc () @property (nonatomic, strong) avcapturesession *capturesession;//负责输入和输出设备之间的数据传递@property (nonatomic, strong) avcapturedeviceinput *capturedeviceinput;//负责从avcapturedevice获得输入数据@property (nonatomic, strong) avcapturestillimageoutput *capturestillimageoutput;//照片输出流@property (nonatomic, strong) avcapturevideopreviewlayer *capturevideopreviewlayer;//相机拍摄预览图层@property (nonatomic, weak) uiview *containerview;//内容视图@property (nonatomic, weak) uiimageview *focuscursor;//聚焦按钮@property (nonatomic, weak) uiimageview *imgview;//拍摄照片 @end @implementation hwphotovc - (void)viewdidload { [super viewdidload]; self.navigationitem.title = @"拍照"; self.view.backgroundcolor = [uicolor whitecolor]; //创建控件 [self creatcontrol];} - (void)viewwillappear:(bool)animated{ [super viewwillappear:animated]; //初始化信息 [self initphotoinfo];} - (void)viewdidappear:(bool)animated{ [super viewdidappear:animated]; [self.capturesession startrunning];} - (void)viewdiddisappear:(bool)animated{ [super viewdiddisappear:animated]; [self.capturesession stoprunning];} - (void)creatcontrol{ cgfloat btnw = 150.f; cgfloat btnh = 40.f; cgfloat marginy = 20.f; cgfloat w = [uiscreen mainscreen].bounds.size.width; cgfloat h = [uiscreen mainscreen].bounds.size.height; //内容视图 cgfloat containerviewh = h - 64 - btnh - marginy * 3; uiview *containerview = [[uiview alloc] initwithframe:cgrectmake(10, 64 + marginy, w - 20, containerviewh)]; containerview.backgroundcolor = [uicolor whitecolor]; containerview.layer.borderwidth = 1.f; containerview.layer.bordercolor = [[uicolor graycolor] cgcolor]; [self.view addsubview:containerview]; _containerview = containerview; //摄像头切换按钮 cgfloat cameraswitchbtnw = 50.f; cgfloat cameraswitchbtnmargin = 10.f; uibutton *cameraswitchbtn = [[uibutton alloc] initwithframe:cgrectmake(containerview.bounds.size.width - cameraswitchbtnw - cameraswitchbtnmargin, 64 + marginy + cameraswitchbtnmargin, cameraswitchbtnw, cameraswitchbtnw)]; [cameraswitchbtn setimage:[uiimage imagenamed:@"camera_switch"] forstate:uicontrolstatenormal]; [cameraswitchbtn addtarget:self action:@selector(cameraswitchbtnonclick) forcontrolevents:uicontroleventtouchupinside]; [self.view addsubview:cameraswitchbtn]; //聚焦图片 uiimageview *focuscursor = [[uiimageview alloc] initwithframe:cgrectmake(50, 50, 75, 75)]; focuscursor.alpha = 0; focuscursor.image = [uiimage imagenamed:@"camera_focus_red"]; [containerview addsubview:focuscursor]; _focuscursor = focuscursor; //拍摄照片容器 uiimageview *imgview = [[uiimageview alloc] initwithframe:containerview.frame]; imgview.hidden = yes; imgview.layer.borderwidth = 1.f; imgview.layer.bordercolor = [[uicolor graycolor] cgcolor]; imgview.contentmode = uiviewcontentmodescaleaspectfill; imgview.clipstobounds = yes; [self.view addsubview:imgview]; _imgview = imgview; //按钮 nsarray *titlearray = @[@"拍摄照片", @"重新拍摄"]; cgfloat btny = cgrectgetmaxy(containerview.frame) + marginy; cgfloat margin = (w - btnw * titlearray.count) / (titlearray.count + 1); for (int i = 0; i < titlearray.count; i++) { cgfloat btnx = margin + (margin + btnw) * i; uibutton *btn = [[uibutton alloc] initwithframe:cgrectmake(btnx, btny, btnw, btnh)]; btn.tag = 1000 + i; [btn settitle:titlearray[i] forstate:uicontrolstatenormal]; btn.backgroundcolor = [uicolor orangecolor]; btn.layer.cornerradius = 2.0f; btn.layer.maskstobounds = yes; if (i == 1) { btn.hidden = yes; } [btn addtarget:self action:@selector(btnonclick:) forcontrolevents:uicontroleventtouchupinside]; [self.view addsubview:btn]; }} - (void)initphotoinfo{ //初始化会话 _capturesession = [[avcapturesession alloc] init]; //设置分辨率 if ([_capturesession cansetsessionpreset:avcapturesessionpreset1280x720]) { _capturesession.sessionpreset = avcapturesessionpreset1280x720; } //获得输入设备,取得后置摄像头 avcapturedevice *capturedevice = [self getcameradevicewithposition:avcapturedevicepositionback]; if (!capturedevice) { nslog(@"取得后置摄像头时出现问题"); return; } nserror *error = nil; //根据输入设备初始化设备输入对象，用于获得输入数据 _capturedeviceinput = [[avcapturedeviceinput alloc]initwithdevice:capturedevice error:&error]; if (error) { nslog(@"取得设备输入对象时出错，错误原因：%@", error.localizeddescription); return; } //初始化设备输出对象，用于获得输出数据 _capturestillimageoutput = [[avcapturestillimageoutput alloc] init]; nsdictionary *outputsettings = @{avvideocodeckey:avvideocodecjpeg}; //输出设置 [_capturestillimageoutput setoutputsettings:outputsettings]; //将设备输入添加到会话中 if ([_capturesession canaddinput:_capturedeviceinput]) { [_capturesession addinput:_capturedeviceinput]; } //将设备输出添加到会话中 if ([_capturesession canaddoutput:_capturestillimageoutput]) { [_capturesession addoutput:_capturestillimageoutput]; } //创建视频预览层，用于实时展示摄像头状态 _capturevideopreviewlayer = [[avcapturevideopreviewlayer alloc] initwithsession:self.capturesession]; //摄像头方向 avcaptureconnection *captureconnection = [self.capturevideopreviewlayer connection]; captureconnection.videoorientation = avcapturevideoorientationportrait; calayer *layer = _containerview.layer; layer.maskstobounds = yes; _capturevideopreviewlayer.frame = layer.bounds; //填充模式 _capturevideopreviewlayer.videogravity = avlayervideogravityresizeaspectfill; //将视频预览层添加到界面中 [layer insertsublayer:_capturevideopreviewlayer below:self.focuscursor.layer]; [self addnotificationtocapturedevice:capturedevice]; [self addgensturerecognizer];} - (void)btnonclick:(uibutton *)btn{ if (btn.tag == 1000) { //拍摄照片 [self photobtnonclick]; }else if (btn.tag == 1001) { //重新拍摄 [self resetphoto]; }} #pragma mark 拍照- (void)photobtnonclick{ //根据设备输出获得连接 avcaptureconnection *captureconnection = [self.capturestillimageoutput connectionwithmediatype:avmediatypevideo]; captureconnection.videoorientation = avcapturevideoorientationportrait; //根据连接取得设备输出的数据 [self.capturestillimageoutput capturestillimageasynchronouslyfromconnection:captureconnection completionhandler:^(cmsamplebufferref imagedatasamplebuffer, nserror *error) { if (imagedatasamplebuffer) { nsdata *imagedata = [avcapturestillimageoutput jpegstillimagensdatarepresentation:imagedatasamplebuffer]; uiimage *image = [uiimage imagewithdata:imagedata]; _imgview.image = image; _imgview.hidden = no; } }]; uibutton *btn = (uibutton *)[self.view viewwithtag:1001]; btn.hidden = no;} //重新拍摄- (void)resetphoto{ _imgview.hidden = yes; uibutton *btn = (uibutton *)[self.view viewwithtag:1001]; btn.hidden = yes;} #pragma mark - 通知//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; }]; //捕获区域发生改变 [[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(areachange:) name:avcapturedevicesubjectareadidchangenotification object:capturedevice];} - (void)removenotificationfromcapturedevice:(avcapturedevice *)capturedevice{ [[nsnotificationcenter defaultcenter] removeobserver:self name:avcapturedevicesubjectareadidchangenotification object:capturedevice];} //移除所有通知- (void)removenotification{ [[nsnotificationcenter defaultcenter] removeobserver:self];} //设备连接成功- (void)deviceconnected:(nsnotification *)notification{ nslog(@"设备已连接...");} //设备连接断开- (void)devicedisconnected:(nsnotification *)notification{ nslog(@"设备已断开.");} //捕获区域改变- (void)areachange:(nsnotification *)notification{ nslog(@"捕获区域改变...");} #pragma mark - 私有方法//取得指定位置的摄像头- (avcapturedevice *)getcameradevicewithposition:(avcapturedeviceposition )position{ nsarray *cameras = [avcapturedevice deviceswithmediatype:avmediatypevideo]; for (avcapturedevice *camera in cameras) { if ([camera position] == position) { return camera; } } return nil;} #pragma mark 切换前后摄像头- (void)cameraswitchbtnonclick{ avcapturedevice *currentdevice = [self.capturedeviceinput device]; avcapturedeviceposition currentposition = [currentdevice position]; [self removenotificationfromcapturedevice:currentdevice]; avcapturedevice *tochangedevice; avcapturedeviceposition tochangeposition = avcapturedevicepositionfront; if (currentposition == avcapturedevicepositionunspecified || currentposition == avcapturedevicepositionfront) { tochangeposition = avcapturedevicepositionback; } 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.capturesession beginconfiguration]; //移除原有输入对象 [self.capturesession removeinput:self.capturedeviceinput]; //添加新的输入对象 if ([self.capturesession canaddinput:tochangedeviceinput]) { [self.capturesession addinput:tochangedeviceinput]; self.capturedeviceinput = tochangedeviceinput; } //提交会话配置 [self.capturesession commitconfiguration];} //改变设备属性的统一操作方法- (void)changedeviceproperty:(void (^)(avcapturedevice *))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]) { 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- (void)setflashmode:(avcaptureflashmode)flashmode{ [self changedeviceproperty:^(avcapturedevice *capturedevice) { if ([capturedevice isflashmodesupported:flashmode]) { [capturedevice setflashmode:flashmode]; } }];} //设置聚焦模式- (void)setfocusmode:(avcapturefocusmode)focusmode{ [self changedeviceproperty:^(avcapturedevice *capturedevice) { if ([capturedevice isfocusmodesupported:focusmode]) { [capturedevice setfocusmode:focusmode]; } }];} //设置曝光模式- (void)setexposuremode:(avcaptureexposuremode)exposuremode{ [self changedeviceproperty:^(avcapturedevice *capturedevice) { if ([capturedevice isexposuremodesupported:exposuremode]) { [capturedevice setexposuremode:exposuremode]; } }];} //设置聚焦点- (void)focuswithmode:(avcapturefocusmode)focusmode exposuremode:(avcaptureexposuremode)exposuremode atpoint:(cgpoint)point{ [self changedeviceproperty:^(avcapturedevice *capturedevice) { if ([capturedevice isfocusmodesupported:focusmode]) { [capturedevice setfocusmode:avcapturefocusmodeautofocus]; } if ([capturedevice isfocuspointofinterestsupported]) { [capturedevice setfocuspointofinterest:point]; } if ([capturedevice isexposuremodesupported:exposuremode]) { [capturedevice setexposuremode:avcaptureexposuremodeautoexpose]; } if ([capturedevice isexposurepointofinterestsupported]) { [capturedevice setexposurepointofinterest:point]; } }];} //添加点按手势，点按时聚焦- (void)addgensturerecognizer{ [self.containerview addgesturerecognizer:[[uitapgesturerecognizer alloc] initwithtarget:self action:@selector(tapscreen:)]];} - (void)tapscreen:(uitapgesturerecognizer *)tapgesture{ cgpoint point = [tapgesture locationinview:self.containerview]; //将ui坐标转化为摄像头坐标 cgpoint camerapoint = [self.capturevideopreviewlayer capturedevicepointofinterestforpoint:point]; [self setfocuscursorwithpoint:point]; [self focuswithmode:avcapturefocusmodeautofocus exposuremode:avcaptureexposuremodeautoexpose atpoint:camerapoint];} //设置聚焦光标位置- (void)setfocuscursorwithpoint:(cgpoint)point{ self.focuscursor.center = point; self.focuscursor.transform = cgaffinetransformmakescale(1.5, 1.5); self.focuscursor.alpha = 1.0; [uiview animatewithduration:1.0 animations:^{ self.focuscursor.transform = cgaffinetransformidentity; } completion:^(bool finished) { self.focuscursor.alpha = 0; }];} - (void)dealloc{ [self removenotification];} @end |
demo下载链接
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：https://blog.csdn.net/hero_wqb/article/details/77620878
