ios原生二维码扫描
程序员文章站
2022-06-23 14:50:58
做ios的二维码扫描,有两个第三方库可以选择,zbar和zxing。今天要介绍的是ios7.0后avfoundation框架提供的原生二维码扫描。
首先需要添加avfou...
做ios的二维码扫描,有两个第三方库可以选择,zbar和zxing。今天要介绍的是ios7.0后avfoundation框架提供的原生二维码扫描。
首先需要添加avfoundation.framework框架到你工程中build phase的"link binary with libraries"之下,然后就可以开始了。
一、做好准备工作,搭建ui
ui效果如图
iboutlet、ibaction如下:
@property (weak, nonatomic) iboutlet uiview *viewpreview; @property (weak, nonatomic) iboutlet uilabel *lblstatus; @property (weak, nonatomic) iboutlet uibutton *startbtn; - (ibaction)startstopreading:(id)sender;
接下来就都是代码的事情了
二、控制器viewcontroller.h
首先导入avfoundation框架
#import <avfoundation/avfoundation.h>
然后控制器实现 avcapturemetadataoutputobjectsdelegate协议
@interface viewcontroller ()<avcapturemetadataoutputobjectsdelegate>
整体property如下:
@property (strong, nonatomic) uiview *boxview; @property (nonatomic) bool isreading; @property (strong, nonatomic) calayer *scanlayer; -(bool)startreading; -(void)stopreading;
//捕捉会话
@property (nonatomic, strong) avcapturesession *capturesession;
//展示layer
@property (nonatomic, strong) avcapturevideopreviewlayer *videopreviewlayer;
然后在viewdidload方法中初始化
- (void)viewdidload { [super viewdidload]; _capturesession = nil; _isreading = no; }
接下来实现startreading方法(这可就是重点咯)
- (bool)startreading { nserror *error; //1.初始化捕捉设备(avcapturedevice),类型为avmediatypevideo avcapturedevice *capturedevice = [avcapturedevice defaultdevicewithmediatype:avmediatypevideo]; //2.用capturedevice创建输入流 avcapturedeviceinput *input = [avcapturedeviceinput deviceinputwithdevice:capturedevice error:&error]; if (!input) { nslog(@"%@", [error localizeddescription]); return no; } //3.创建媒体数据输出流 avcapturemetadataoutput *capturemetadataoutput = [[avcapturemetadataoutput alloc] init]; //4.实例化捕捉会话 _capturesession = [[avcapturesession alloc] init]; //4.1.将输入流添加到会话 [_capturesession addinput:input]; //4.2.将媒体输出流添加到会话中 [_capturesession addoutput:capturemetadataoutput]; //5.创建串行队列,并加媒体输出流添加到队列当中 dispatch_queue_t dispatchqueue; dispatchqueue = dispatch_queue_create("myqueue", null); //5.1.设置代理 [capturemetadataoutput setmetadataobjectsdelegate:self queue:dispatchqueue]; //5.2.设置输出媒体数据类型为qrcode [capturemetadataoutput setmetadataobjecttypes:[nsarray arraywithobject:avmetadataobjecttypeqrcode]]; //6.实例化预览图层 _videopreviewlayer = [[avcapturevideopreviewlayer alloc] initwithsession:_capturesession]; //7.设置预览图层填充方式 [_videopreviewlayer setvideogravity:avlayervideogravityresizeaspectfill]; //8.设置图层的frame [_videopreviewlayer setframe:_viewpreview.layer.bounds]; //9.将图层添加到预览view的图层上 [_viewpreview.layer addsublayer:_videopreviewlayer]; //10.设置扫描范围 capturemetadataoutput.rectofinterest = cgrectmake(0.2f, 0.2f, 0.8f, 0.8f); //10.1.扫描框 _boxview = [[uiview alloc] initwithframe:cgrectmake(_viewpreview.bounds.size.width * 0.2f, _viewpreview.bounds.size.height * 0.2f, _viewpreview.bounds.size.width - _viewpreview.bounds.size.width * 0.4f, _viewpreview.bounds.size.height - _viewpreview.bounds.size.height * 0.4f)]; _boxview.layer.bordercolor = [uicolor greencolor].cgcolor; _boxview.layer.borderwidth = 1.0f; [_viewpreview addsubview:_boxview]; //10.2.扫描线 _scanlayer = [[calayer alloc] init]; _scanlayer.frame = cgrectmake(0, 0, _boxview.bounds.size.width, 1); _scanlayer.backgroundcolor = [uicolor browncolor].cgcolor; [_boxview.layer addsublayer:_scanlayer]; nstimer *timer = [nstimer scheduledtimerwithtimeinterval:0.2f target:self selector:@selector(movescanlayer:) userinfo:nil repeats:yes]; [timer fire]; //10.开始扫描 [_capturesession startrunning]; return yes; }
实现avcapturemetadataoutputobjectsdelegate协议方法
#pragma mark - avcapturemetadataoutputobjectsdelegate - (void)captureoutput:(avcaptureoutput *)captureoutput didoutputmetadataobjects:(nsarray *)metadataobjects fromconnection:(avcaptureconnection *)connection { //判断是否有数据 if (metadataobjects != nil && [metadataobjects count] > 0) { avmetadatamachinereadablecodeobject *metadataobj = [metadataobjects objectatindex:0]; //判断回传的数据类型 if ([[metadataobj type] isequaltostring:avmetadataobjecttypeqrcode]) { [_lblstatus performselectoronmainthread:@selector(settext:) withobject:[metadataobj stringvalue] waituntildone:no]; [self performselectoronmainthread:@selector(stopreading) withobject:nil waituntildone:no]; _isreading = no; } } }
实现计时器方法movescanlayer:(nstimer *)timer
- (void)movescanlayer:(nstimer *)timer { cgrect frame = _scanlayer.frame; if (_boxview.frame.size.height < _scanlayer.frame.origin.y) { frame.origin.y = 0; _scanlayer.frame = frame; }else{ frame.origin.y += 5; [uiview animatewithduration:0.1 animations:^{ _scanlayer.frame = frame; }]; } }
实现开始和停止方法
- (ibaction)startstopreading:(id)sender { if (!_isreading) { if ([self startreading]) { [_startbtn settitle:@"stop" forstate:uicontrolstatenormal]; [_lblstatus settext:@"scanning for qr code"]; } } else{ [self stopreading]; [_startbtn settitle:@"start!" forstate:uicontrolstatenormal]; } _isreading = !_isreading; } -(void)stopreading{ [_capturesession stoprunning]; _capturesession = nil; [_scanlayer removefromsuperlayer]; [_videopreviewlayer removefromsuperlayer]; }
以上内容就是本文给大家介绍ios原生二维码扫描的全部内容,希望大家喜欢。
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