iOS內建掃描 和 產生二維碼

標籤：qrcode   ios   

1.二維碼產生

libqrencode介紹：是一個用C語言編寫的用來解析二維條碼(QRCode)的程式庫，libqrencode通過手機的CCD網路攝影機來掃描二維條碼。

匯入libqrencode庫，下面直接代碼：

#import <Foundation/Foundation.h>@interface QRCodeGenerator : NSObject+ (UIImage *)qrImageForString:(NSString *)string imageSize:(CGFloat)size;+ (UIImage *) twoDimensionCodeImage:(UIImage *)twoDimensionCode withAvatarImage:(UIImage *)avatarImage;@end

#import "QRCodeGenerator.h"#import "qrencode.h"enum {qr_margin = 3};@implementation QRCodeGenerator+ (void)drawQRCode:(QRcode *)code context:(CGContextRef)ctx size:(CGFloat)size {unsigned char *data = 0;int width;data = code->data;width = code->width;float zoom = (double)size / (code->width + 2.0 * qr_margin);CGRect rectDraw = CGRectMake(0, 0, zoom, zoom);// drawCGContextSetFillColor(ctx, CGColorGetComponents([UIColor blackColor].CGColor));for(int i = 0; i < width; ++i) {for(int j = 0; j < width; ++j) {if(*data & 1) {rectDraw.origin = CGPointMake((j + qr_margin) * zoom,(i + qr_margin) * zoom);CGContextAddRect(ctx, rectDraw);}++data;}}CGContextFillPath(ctx);}+ (UIImage *)qrImageForString:(NSString *)string imageSize:(CGFloat)size {if (![string length]) {return nil;}QRcode *code = QRcode_encodeString([string UTF8String], 0, QR_ECLEVEL_L, QR_MODE_8, 1);if (!code) {return nil;}// create contextCGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();CGContextRef ctx = CGBitmapContextCreate(0, size, size, 8, size * 4, colorSpace, kCGImageAlphaPremultipliedLast);CGAffineTransform translateTransform = CGAffineTransformMakeTranslation(0, -size);CGAffineTransform scaleTransform = CGAffineTransformMakeScale(1, -1);CGContextConcatCTM(ctx, CGAffineTransformConcat(translateTransform, scaleTransform));// draw QR on this context[QRCodeGenerator drawQRCode:code context:ctx size:size];// get imageCGImageRef qrCGImage = CGBitmapContextCreateImage(ctx);UIImage * qrImage = [UIImage imageWithCGImage:qrCGImage];// some releasesCGContextRelease(ctx);CGImageRelease(qrCGImage);CGColorSpaceRelease(colorSpace);QRcode_free(code);return qrImage;}+ (UIImage *) twoDimensionCodeImage:(UIImage *)twoDimensionCode withAvatarImage:(UIImage *)avatarImage{        // two-dimension code 二維碼        CGSize size = twoDimensionCode.size;        CGSize size2 =CGSizeMake(1.0 / 5.5 * size.width, 1.0 / 5.5 * size.height);                UIGraphicsBeginImageContext(size);                [twoDimensionCode drawInRect:CGRectMake(0, 0, size.width, size.height)];        [[self avatarImage:avatarImage] drawInRect:CGRectMake((size.width - size2.width) / 2.0, (size.height - size2.height) / 2.0, size2.width, size2.height)];                UIImage *resultingImage =UIGraphicsGetImageFromCurrentImageContext();        UIGraphicsEndImageContext();        return resultingImage;    }+ (UIImage *) avatarImage:(UIImage *)avatarImage{        UIImage * avatarBackgroudImage = [UIImage imageNamed:@"icon.png"];        CGSize size = avatarBackgroudImage.size;        UIGraphicsBeginImageContext(size);                [avatarBackgroudImage drawInRect:CGRectMake(0, 0, size.width, size.height)];        [avatarImage drawInRect:CGRectMake(10, 10, size.width - 20, size.height - 20)];                UIImage *resultingImage =UIGraphicsGetImageFromCurrentImageContext();        UIGraphicsEndImageContext();        return resultingImage;    }@end

2.掃描

iOS7蘋果推出了內建的掃描功能，下面直接代碼：

-(void)viewWillAppear:(BOOL)animated{    [self setupCamera];}- (void)setupCamera{    // Device    _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];        // Input    _input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];        // Output    _output = [[AVCaptureMetadataOutput alloc]init];    [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];        // Session    _session = [[AVCaptureSession alloc]init];    [_session setSessionPreset:AVCaptureSessionPresetHigh];    if ([_session canAddInput:self.input])    {        [_session addInput:self.input];    }        if ([_session canAddOutput:self.output])    {        [_session addOutput:self.output];    }        // 條碼類型 AVMetadataObjectTypeQRCode    _output.metadataObjectTypes [email protected][AVMetadataObjectTypeCode128Code,AVMetadataObjectTypeUPCECode,AVMetadataObjectTypeCode39Code,AVMetadataObjectTypeCode39Mod43Code,AVMetadataObjectTypeEAN13Code,AVMetadataObjectTypeEAN8Code,AVMetadataObjectTypeCode93Code,AVMetadataObjectTypePDF417Code,AVMetadataObjectTypeQRCode,AVMetadataObjectTypeAztecCode,AVMetadataObjectTypeInterleaved2of5Code,AVMetadataObjectTypeITF14Code,AVMetadataObjectTypeDataMatrixCode] ;        // Preview    _preview =[AVCaptureVideoPreviewLayer layerWithSession:self.session];    _preview.videoGravity = AVLayerVideoGravityResizeAspectFill;    _preview.frame =CGRectMake(20,110,280,280);    [self.view.layer insertSublayer:self.preview atIndex:0];            // Start    [_session startRunning];}#pragma mark AVCaptureMetadataOutputObjectsDelegate- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{       NSString *stringValue;        if ([metadataObjects count] >0)    {        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];        stringValue = metadataObject.stringValue;    }        [_session stopRunning];    UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"提示" message:[NSString stringWithFormat:@"結果：%@",stringValue] delegate:self cancelButtonTitle:nil otherButtonTitles:@"知道了",@"重新掃描", nil];    [alert show];}- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{    if(buttonIndex == 0)    {        [self dismissViewControllerAnimated:YES completion:^         {             [timer invalidate];         }];    }    else    {        [_session startRunning];    }}

iOS內建掃描 和 產生二維碼