生成二维码

// 生成二维码
- (UIImage *)generateQRCode:(NSString *)code size:(CGSize)size {
    
    NSData *codeData = [code dataUsingEncoding:NSUTF8StringEncoding];
    //生成
    CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    [qrFilter setValue:codeData forKey:@"inputMessage"];
    [qrFilter setValue:@"H" forKey:@"inputCorrectionLevel"];
    
     //上色
    CIFilter *colorFilter = [CIFilter filterWithName:@"CIFalseColor"
                                       keysAndValues:
                             @"inputImage",qrFilter.outputImage,
                             @"inputColor0",[CIColor colorWithCGColor:[UIColor blackColor].CGColor],
                             @"inputColor1",[CIColor colorWithCGColor:[UIColor whiteColor].CGColor],
                             nil];
    
    CIImage *qrImage = colorFilter.outputImage;
    
    //绘制
    CGImageRef cgImage = [[CIContext contextWithOptions:nil] createCGImage:qrImage fromRect:qrImage.extent];
    UIGraphicsBeginImageContext(size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetInterpolationQuality(context, kCGInterpolationNone);
    CGContextScaleCTM(context, 1.0, -1.0);
    CGContextDrawImage(context, CGContextGetClipBoundingBox(context), cgImage);
    UIImage *codeImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    CGImageRelease(cgImage);
    
    return codeImage;
}

生成条形码

// 生成条形码
- (UIImage *)generateBarCode:(NSString *)code size:(CGSize)size {
    // 注意生成条形码的编码方式
    NSData *codeData = [code dataUsingEncoding: NSASCIIStringEncoding];
    CIFilter *filter = [CIFilter filterWithName:@"CICode128BarcodeGenerator"];
    [filter setValue:codeData forKey:@"inputMessage"];
    // 设置生成的条形码的上，下，左，右的margins的值
    [filter setValue:[NSNumber numberWithInteger:0] forKey:@"inputQuietSpace"];
    CIImage *qrImage = filter.outputImage;
    
    //绘制
    CGImageRef cgImage = [[CIContext contextWithOptions:nil] createCGImage:qrImage fromRect:qrImage.extent];
    UIGraphicsBeginImageContext(size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetInterpolationQuality(context, kCGInterpolationNone);
    CGContextScaleCTM(context, 1.0, -1.0);
    CGContextDrawImage(context, CGContextGetClipBoundingBox(context), cgImage);
    UIImage *codeImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    CGImageRelease(cgImage);
    
    return codeImage;
}