iOS 7 二维码的生成

叁歲伎倆 2022-10-02 14:58 147阅读 0赞

//二维码生成
        
        //UIImageView *theImageView = [[UIImageView alloc]init];
        //[self.view addSubview:theImageView];
        
        CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
        [filter setDefaults];
        NSData *data = [@"hello worold!" 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));
        // Resize without interpolating
        UIImage *resized = [self resizeImage:image
                                 withQuality:kCGInterpolationNone
                                        rate:5.0];
        
        NSLog(@"%@",NSStringFromCGSize(resized.size));
    
        UIImageView *theImageView =[[UIImageView alloc]initWithImage:resized];
        theImageView.frame = CGRectMake(100, 200, 100, 100);
        [self.view addSubview:theImageView];
        
        CGImageRelease(cgImage);

由于生成的二维码和图片非常小，所以使用方法放大了5倍

//Resize image
    
    - (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;
    }

生成的结果：

![22152126-1eeaf16422704f18a1da727f8bec5f6f.png][]

转载于:https://www.cnblogs.com/cocoajin/p/3382501.html

[22152126-1eeaf16422704f18a1da727f8bec5f6f.png]: /images/20220109/73cd17ebd8884bebb49e54cf108f920c.png