ios sdk二维码生成器

//二维码生成且放到UIImageView显示

- (void)ciImageFromString:(NSString *)qrString imgView:(UIImageView *)imgView imgSize:(CGSize)size{

    

    imgView.backgroundColor = [UIColor redColor];

    imgView.contentMode = UIViewContentModeCenter;

    

    NSData *stringData = [qrString dataUsingEncoding:NSUTF8StringEncoding];

    

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

    

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

    

    // 5.生成二维码

    CIImage *outputImage = filter.outputImage;

    CGFloat scale = size.width / CGRectGetWidth(outputImage.extent);

    CGAffineTransform transform = CGAffineTransformMakeScale(scale, scale); // scale 为放大倍数

    CIImage *transformImage = [outputImage imageByApplyingTransform:transform];

    

    // 保存

    CIContext *context = [CIContext contextWithOptions:nil];

    CGImageRef imageRef = [context createCGImage:transformImage fromRect:transformImage.extent];

    UIImage *qrCodeImage = [UIImage imageWithCGImage:imageRef];

    

    // 6.设置生成好得二维码到imageView上

    imgView.image = qrCodeImage;

    

}