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
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@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
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// 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
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/** * 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
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// 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
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// 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服务器之家。
