Shows how to generate a QRCode on iOS or Mac OS X

QRCode.m

#if TARGET_OS_IPHONE
#import <UIKit/UIKit.h>
typedef UIImage QRImage;
#else
#import <AppKit/AppKit.h>
typedef NSImage QRImage;
#endif


+ (QRImage*) QRCodeImageWithData: (NSData*)data size: (CGFloat)size {
    CIFilter* filter = [CIFilter filterWithName: @"CIQRCodeGenerator"];
    [filter setValue: data forKey: @"inputMessage"];
    CIImage* ciImage = filter.outputImage;
    if (!ciImage)
        return nil;

#if TARGET_OS_IPHONE
    UIImage* tinyImage = [[UIImage alloc] initWithCIImage: ciImage];
    if (size <= tinyImage.size.width)
        return tinyImage;

    // Scale image up:
    UIGraphicsBeginImageContext(CGSizeMake(size, size));
    CGContextSetInterpolationQuality(UIGraphicsGetCurrentContext(), kCGInterpolationNone);
    [tinyImage drawInRect: CGRectMake(0, 0, size, size)];
    UIImage* image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;

#else
    NSCIImageRep *rep = [NSCIImageRep imageRepWithCIImage: ciImage];
    NSImage* tinyImage = [[NSImage alloc] init];
    [tinyImage addRepresentation: rep];
    if (size <= rep.size.width)
        return tinyImage;

    // Scale image up:
    NSImage* nsImage = [[NSImage alloc] initWithSize: NSMakeSize(size, size)];
    [nsImage lockFocus];
    [NSGraphicsContext currentContext].imageInterpolation = NSImageInterpolationNone;
    [tinyImage drawInRect: NSMakeRect(0, 0, size, size)];
    [nsImage unlockFocus];
    return nsImage;
#endif
}


+ (CBImage*) QRCodeImageWithData: (NSData*)data {
    return [self QRCodeImageWithData: data size: 500];
}

thanks for this useful code! One bug/issue is at the bottom: CBImage should be QRImage.

I completely rewrite it on swift. My I cite you in my public repo or we can merge these two?

@ingconti Sure, you can cite me; I'm not maintaining this code but you can add a link to yours here.

Outdated code. Please update with modern API UIGraphicsImageRenderer ...
UIImage *outputImage;
UIGraphicsBeginImageContextWithOptions(NSMakeSize(size, size), NO, 0);
UIGraphicsImageRenderer *renderer = [[UIGraphicsImageRenderer alloc] initWithBounds:CGMakeRect(0,0,size,size)];
outputImage = [renderer imageWithActions:^(UIGraphicsImageRendererContext *ctx) {
//draw QR code
}];

Please update with modern API

As I said, I'm not maintaining this. But thanks for posting more recent code.

You are welcome

On 28 Oct 2019, at 18:05, Jens Alfke ***@***.***> wrote: Please update with modern API As I said, I'm not maintaining this. But thanks for posting more recent code. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <https://gist.github.com/c210cc4cbfe8fd277186?email_source=notifications&email_token=AA64MJ6RM3DOZDRKKXOY5QTQQ4LULA5CNFSM4HWG7FIKYY3PNVWWK3TUL52HS4DFVNDWS43UINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAF3IIS#gistcomment-3068041>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA64MJ7ABKX3CHQTF265RX3QQ4LULANCNFSM4HWG7FIA>.

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