iOS二维码条形码的制作

- (IBAction)creatQRImage:(id)sender {

   

[self.textField resignFirstResponder];

    

 //这里是我放了个TextField的控件，但我们没有输入值得时候就返回

    if (self.textField.text.length ==0) {

       return;

    }

    // 1.创建过滤器：做二维码还是条形码的关键CIQRCodeGenerator

    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];

    // 2.恢复默认

    [filter setDefaults];

    // 3.给过滤器添加数据(正则表达式/账号和密码)

    NSString *dataString = self.textField.text;

    NSData *data = [dataString dataUsingEncoding:NSUTF8StringEncoding];

    [filter setValue:data forKeyPath:@"inputMessage"];

    // 4.获取输出的二维码

    CIImage *outputImage = [filter outputImage];

    // 5.将CIImage转换成UIImage，并放大显示

    self.imageView.image = [self createNonInterpolatedUIImageFormCIImage:outputImage withSize:200];

    

}

 

 

- (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size

{

    //A rectangle that specifies the extent of the image. (read-only)

    //This rectangle specifies the extent of the image in working space coordinates.

    CGRect extent = CGRectIntegral(image.extent);

    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));

    // 1.创建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到图片

    CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);

    CGContextRelease(bitmapRef);

    CGImageRelease(bitmapImage);

    return [UIImage imageWithCGImage:scaledImage];

}

 下面是条形码

- (UIImage*)generateBarCode:(NSString*)barCodeStr width:(CGFloat)width height:(CGFloat)height

{

    CIImage * barcodeImage;

    

    NSData * data = [barCodeStr dataUsingEncoding:NSUTF8StringEncoding];

    CIFilter * filter = [CIFilter filterWithName:@"CICode128BarcodeGenerator"];

    

    [filter setValue:data forKey:@"inputMessage"];

    barcodeImage = [ filter outputImage];

    CGFloat scaleX = width / barcodeImage.extent.size.width;

    CGFloat scaleY = height / barcodeImage.extent.size.height;

    

    CIImage * transformedImage = [barcodeImage imageByApplyingTransform:CGAffineTransformScale(CGAffineTransformIdentity, scaleX, scaleY)];

    return [UIImage imageWithCIImage:transformedImage];

    

    

}