iOS 7 Core Image QR Code生成太模糊 [英] iOS 7 Core Image QR Code generation too blur

问题描述

这是我用于生成QRCode图像的代码

here's my code for generating QRCode image

+ (UIImage *)generateQRCodeWithString:(NSString *)string {
    NSData *stringData = [string dataUsingEncoding:NSUTF8StringEncoding];
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    [filter setValue:stringData forKey:@"inputMessage"];
    [filter setValue:@"M" forKey:@"inputCorrectionLevel"];
    return [UIImage imageWithCIImage:filter.outputImage];
}

结果太模糊。是否可以设置生成的二维码的大小？

The result is too blur. Is it possible to set the size of the generated qr code?

推荐答案

我本来打算悬赏这个问题，但我找到了答案。

I was about to start bounty on this question but i found the answer.

您需要的是一个比例过滤器。要使用CoreImage实现此目的，您需要执行以下操作：

What you need is a scale filter. To achieve this with CoreImage, you need to do something like this:

CIImage *input = [CIImage imageWithCGImage: ImageView.Image.CGImage]; // input image is 100 X 100
CGAffineTransform transform = CGAffineTransformMakeScale(5.0f, 5.0f); // Scale by 5 times along both dimensions
CIImage *output = [input imageByApplyingTransform: transform];
// output image is now 500 X 500

从以下答案： https://stackoverflow.com/a/16316701/2859764

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