iOS生成二维码

雨点打透心脏的1/2处 2022-07-12 12:26 195阅读 0赞

//  生成二维码
    -(void)createQRCode{
        CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
        [filter setDefaults];
        NSData *data = [@"http://blog.csdn.net/chen_gp_x" dataUsingEncoding:NSUTF8StringEncoding];
        [filter setValue:data forKey:@"inputMessage"];
        CIImage *outputImage = [filter outputImage];
        CIContext *context = [CIContext contextWithOptions:nil];
        CGImageRef cgImage = [context createCGImage:outputImage
                                           fromRect:[outputImage extent]];
        UIImage *image = [UIImage imageWithCGImage:cgImage
                                             scale:1.
                                       orientation:UIImageOrientationUp];
        NSLog(@"image QRCode : %@",NSStringFromCGSize(image.size));
        UIImage *resized = [self resizeImage:image
                                 withQuality:kCGInterpolationNone
                                        rate:5.0];
        NSLog(@"%@",NSStringFromCGSize(resized.size));
        UIImageView *theImageView =[[UIImageView alloc]initWithImage:resized];
        theImageView.frame = CGRectMake(50, 200, self.view.frame.size.width - 100, self.view.frame.size.width - 100);
        [self.view addSubview:theImageView];
        CGImageRelease(cgImage);
    }

- (UIImage *)resizeImage:(UIImage *)image withQuality:(CGInterpolationQuality)quality rate:(CGFloat)rate{
        UIImage *resized = nil;
        CGFloat width = image.size.width * rate;
        CGFloat height = image.size.height * rate;
        
        UIGraphicsBeginImageContext(CGSizeMake(width, height));
        CGContextRef context = UIGraphicsGetCurrentContext();
        CGContextSetInterpolationQuality(context, quality);
        [image drawInRect:CGRectMake(0, 0, width, height)];
        resized = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        
        return resized;
    }

转载请注明出处：[http://blog.csdn.net/chen\_gp\_x][http_blog.csdn.net_chen_gp_x]

[http_blog.csdn.net_chen_gp_x]: http://blog.csdn.net/chen_gp_x