条形码和二维码生成

- (UIImage *)generateBarCode:(NSString *)code width:(CGFloat)width height:(CGFloat)height {
    // 生成条形码图片
    CIImage *barcodeImage;
    NSData *data = [code dataUsingEncoding:NSISOLatin1StringEncoding allowLossyConversion:false];
    CIFilter *filter = [CIFilter filterWithName:@"CICode128BarcodeGenerator"];

    [filter setValue:data forKey:@"inputMessage"];
    barcodeImage = [filter outputImage];

    // 消除模糊
    CGFloat scaleX = width / barcodeImage.extent.size.width; // extent 返回图片的frame
    CGFloat scaleY = height / barcodeImage.extent.size.height;
    CIImage *transformedImage = [barcodeImage imageByApplyingTransform:CGAffineTransformScale(CGAffineTransformIdentity, scaleX, scaleY)];

    return [UIImage imageWithCIImage:transformedImage];
}

- (UIImage *)generateQRCode:(NSString *)code width:(CGFloat)width height:(CGFloat)height {

    // 生成二维码图片
    CIImage *qrcodeImage;
    NSData *data = [_code dataUsingEncoding:NSISOLatin1StringEncoding allowLossyConversion:false];
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];

    [filter setValue:data forKey:@"inputMessage"];
    [filter setValue:@"H" forKey:@"inputCorrectionLevel"];
    qrcodeImage = [filter outputImage];

    // 消除模糊
    CGFloat scaleX = width / qrcodeImage.extent.size.width; // extent 返回图片的frame
    CGFloat scaleY = height / qrcodeImage.extent.size.height;
    CIImage *transformedImage = [qrcodeImage imageByApplyingTransform:CGAffineTransformScale(CGAffineTransformIdentity, scaleX, scaleY)];

    return [UIImage imageWithCIImage:transformedImage];
}