iOS二维码的生成和扫描
程序员文章站
2023-12-20 20:45:28
本文实例为大家分享了android九宫格图片展示的具体代码,供大家参考,具体内容如下
属性
@property (strong,nonatomic)avcapt...
本文实例为大家分享了android九宫格图片展示的具体代码,供大家参考,具体内容如下
属性
@property (strong,nonatomic)avcapturedevice * device; @property (strong,nonatomic)avcapturedeviceinput * input; @property (strong,nonatomic)avcapturemetadataoutput * output; @property (strong,nonatomic)avcapturesession * session; @property (strong,nonatomic)avcapturevideopreviewlayer * layer; @property (nonatomic, strong)uiimageview *imageview;
二维码的生成
// 1.创建过滤器 cifilter *filter = [cifilter filterwithname:@"ciqrcodegenerator"]; // 2.恢复默认 [filter setdefaults]; // 3.给过滤器添加数据(正则表达式/账号和密码) nsstring *datastring = @"http://www.520it.com"; nsdata *data = [datastring datausingencoding:nsutf8stringencoding]; [filter setvalue:data forkeypath:@"inputmessage"]; // 4.获取输出的二维码 ciimage *outputimage = [filter outputimage]; //因为生成的二维码模糊,所以通过createnoninterpolateduiimageformciimage:outputimage来获得高清的二维码图片 // 5.显示二维码 self.imageview.image = [self createnoninterpolateduiimageformciimage:outputimage withsize:200];
* createnoninterpolateduiimageformciimage:outputimage方法的实现
/** * 根据ciimage生成指定大小的uiimage * * @param image ciimage * @param size 图片宽度 */ - (uiimage *)createnoninterpolateduiimageformciimage:(ciimage *)image withsize:(cgfloat) size { cgrect extent = cgrectintegral(image.extent); cgfloat scale = min(size/cgrectgetwidth(extent), size/cgrectgetheight(extent)); // 1.创建bitmap; size_t width = cgrectgetwidth(extent) * scale; size_t height = cgrectgetheight(extent) * scale; cgcolorspaceref cs = cgcolorspacecreatedevicegray(); cgcontextref bitmapref = cgbitmapcontextcreate(nil, width, height, 8, 0, cs, (cgbitmapinfo)kcgimagealphanone); cicontext *context = [cicontext contextwithoptions:nil]; cgimageref bitmapimage = [context createcgimage:image fromrect:extent]; cgcontextsetinterpolationquality(bitmapref, kcginterpolationnone); cgcontextscalectm(bitmapref, scale, scale); cgcontextdrawimage(bitmapref, extent, bitmapimage); // 2.保存bitmap到图片 cgimageref scaledimage = cgbitmapcontextcreateimage(bitmapref); cgcontextrelease(bitmapref); cgimagerelease(bitmapimage); return [uiimage imagewithcgimage:scaledimage]; }
二维码的扫描
// 1.创建捕捉会话 avcapturesession *session = [[avcapturesession alloc] init]; self.session = session; // 2.添加输入设备(数据从摄像头输入) avcapturedevice *device = [avcapturedevice defaultdevicewithmediatype:avmediatypevideo]; avcapturedeviceinput *input = [avcapturedeviceinput deviceinputwithdevice:device error:nil]; [session addinput:input]; // 3.添加输出数据(示例对象-->类对象-->元类对象-->根元类对象) avcapturemetadataoutput *output = [[avcapturemetadataoutput alloc] init]; [output setmetadataobjectsdelegate:self queue:dispatch_get_main_queue()]; [session addoutput:output]; // 3.1.设置输入元数据的类型(类型是二维码数据) [output setmetadataobjecttypes:@[avmetadataobjecttypeqrcode]]; // 4.添加扫描图层 avcapturevideopreviewlayer *layer = [avcapturevideopreviewlayer layerwithsession:session]; layer.frame = self.view.bounds; [self.view.layer addsublayer:layer]; self.layer = layer; // 5.开始扫描 [session startrunning];
*扫描到结果后会调用的方法
// 当扫描到数据时就会执行该方法 - (void)captureoutput:(avcaptureoutput *)captureoutput didoutputmetadataobjects:(nsarray *)metadataobjects fromconnection:(avcaptureconnection *)connection { if (metadataobjects.count > 0) { //获得扫描数据,最后一个时最新扫描的数据 avmetadatamachinereadablecodeobject *object = [metadataobjects lastobject]; nslog(@"%@", object.stringvalue); // 停止扫描 [self.session stoprunning]; // 将预览图层移除 [self.layer removefromsuperlayer]; } else { nslog(@"没有扫描到数据"); } }
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。