本文實例為大家分享了Android九宮格圖片展示的具體代碼，供大家參考，具體內容如下
屬性
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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; |
二維碼的生成
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// 1.創建過濾器 CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"]; // 2.恢復默認 [filter setDefaults]; // 3.給過濾器添加數據(正則表達式/賬號和密碼) NSString *dataString = @"http://www.520it.com"; NSData *data = [dataString dataUsingEncoding:NSUTF8StringEncoding]; [filter setValue:data forKeyPath:@"inputMessage"]; // 4.獲取輸出的二維碼 CIImage *outputImage = [filter outputImage]; //因為生成的二維碼模糊，所以通過createNonInterpolatedUIImageFormCIImage:outputImage來獲得高清的二維碼圖片 // 5.顯示二維碼 self.imageView.image = [self createNonInterpolatedUIImageFormCIImage:outputImage withSize:200]; |
* createNonInterpolatedUIImageFormCIImage:outputImage方法的實現
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/** * 根據CIImage生成指定大小的UIImage * * @param image CIImage * @param size 圖片寬度 */- (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size{ CGRect extent = CGRectIntegral(image.extent); CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent)); // 1.創建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到圖片 CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef); CGContextRelease(bitmapRef); CGImageRelease(bitmapImage); return [UIImage imageWithCGImage:scaledImage];} |
二維碼的掃描
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// 1.創建捕捉會話 AVCaptureSession *session = [[AVCaptureSession alloc] init]; self.session = session; // 2.添加輸入設備(數據從攝像頭輸入) AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil]; [session addInput:input]; // 3.添加輸出數據(示例對象-->類對象-->元類對象-->根元類對象) AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init]; [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()]; [session addOutput:output]; // 3.1.設置輸入元數據的類型(類型是二維碼數據) [output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]]; // 4.添加掃描圖層 AVCaptureVideoPreviewLayer *layer = [AVCaptureVideoPreviewLayer layerWithSession:session]; layer.frame = self.view.bounds; [self.view.layer addSublayer:layer]; self.layer = layer; // 5.開始掃描 [session startRunning]; |
*掃描到結果后會調用的方法
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// 當掃描到數據時就會執行該方法- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{ if (metadataObjects.count > 0) { //獲得掃描數據，最后一個時最新掃描的數據 AVMetadataMachineReadableCodeObject *object = [metadataObjects lastObject]; NSLog(@"%@", object.stringValue); // 停止掃描 [self.session stopRunning]; // 將預覽圖層移除 [self.layer removeFromSuperlayer]; } else { NSLog(@"沒有掃描到數據"); }} |
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
