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离线生成二维码

发布于 2024-11-10 04:37:19 字数 47 浏览 0 评论 0原文

是否有一个 Objective-C 库可以让我离线生成 QRCodes？谢谢

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动听の歌 2024-11-17 04:37:19

请参阅：https://github.com/jverkoey/ObjQREncoder#readme

使用

#import <QREncoder/QREncoder.h>

UIImage* image = [QREncoder encode:@"http://www.google.com/"];

See: https://github.com/jverkoey/ObjQREncoder#readme

To use

#import <QREncoder/QREncoder.h>

UIImage* image = [QREncoder encode:@"http://www.google.com/"];

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南烟 2024-11-17 04:37:19

在 Mavericks 和 iOS7 中，二维码生成是 Core Image 的一部分。您只需使用 CIQRCodeGenerator 过滤器。在 Github 上，您可以找到一个为 iOS 实现此功能的类。我已经修改了此代码以获得下面的 OS X 兼容代码：

NSString *website = @"http://stackoverflow.com/";
NSData *urlAsData = [website dataUsingEncoding:NSUTF8StringEncoding];

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

[filter setValue: urlAsData forKey:@"inputMessage"];
[filter setValue:@"M" forKey:@"inputCorrectionLevel"];

CIImage *outputImage = [filter valueForKey:kCIOutputImageKey];

如果您想绘制 CIImage，有几种可能性。您可以像这样创建一个 NSImage：

CIContext *context = [[NSGraphicsContext currentContext] CIContext];
CGImageRef cgImage = [context createCGImage:outputImage
                                   fromRect:[outputImage extent]];

NSImage *image = [[NSImage alloc] initWithCGImage:cgImage size:NSZeroSize];

但是该图像通常会比您想要的小得多。我相信二维码中的每个黑点都会变成一个像素。不完全是你想要的。要放大图像而不使其模糊，请执行以下操作：

NSSize largeSize = NSMakeSize(image.size.width * 10, image.size.height * 10);

[image setScalesWhenResized:YES];
NSImage *largeImage = [[NSImage alloc] initWithSize:largeSize];
[largeImage lockFocus];
[image setSize:largeSize];
[[NSGraphicsContext currentContext] setImageInterpolation:NSImageInterpolationNone];
[image drawAtPoint:NSZeroPoint fromRect:CGRectMake(0, 0, largeSize.width, largeSize.height) operation:NSCompositeCopy fraction:1.0];
[largeImage unlockFocus];

largeImage 就是您可以显示的结果图像。

如果您想解码 QR，请使用 AVFoundation，如下所述博客。不幸的是，目前似乎只有 iOS7 支持。

In Mavericks and iOS7 QR code generation is part of Core Image. You just use the CIQRCodeGenerator filter. On Github you can find a class which implements this for iOS. I've adapted this code to get the OS X compatible code below:

NSString *website = @"http://stackoverflow.com/";
NSData *urlAsData = [website dataUsingEncoding:NSUTF8StringEncoding];

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

[filter setValue: urlAsData forKey:@"inputMessage"];
[filter setValue:@"M" forKey:@"inputCorrectionLevel"];

CIImage *outputImage = [filter valueForKey:kCIOutputImageKey];

If you want to draw the CIImage there are several possibilities. You can create an NSImage like this:

CIContext *context = [[NSGraphicsContext currentContext] CIContext];
CGImageRef cgImage = [context createCGImage:outputImage
                                   fromRect:[outputImage extent]];

NSImage *image = [[NSImage alloc] initWithCGImage:cgImage size:NSZeroSize];

But this image will typicall be much smaller than you want. I believe each black dot in the QR code just becomes one pixel. Not quite what you want. To scale up the image without making it blurry, do this:

NSSize largeSize = NSMakeSize(image.size.width * 10, image.size.height * 10);

[image setScalesWhenResized:YES];
NSImage *largeImage = [[NSImage alloc] initWithSize:largeSize];
[largeImage lockFocus];
[image setSize:largeSize];
[[NSGraphicsContext currentContext] setImageInterpolation:NSImageInterpolationNone];
[image drawAtPoint:NSZeroPoint fromRect:CGRectMake(0, 0, largeSize.width, largeSize.height) operation:NSCompositeCopy fraction:1.0];
[largeImage unlockFocus];

largeImage is then your result image which you can display.

If you want to decode a QR you use AVFoundation as explained in this blog. Unfortunately this seems to only be supported on iOS7 at the moment.

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梦明 2024-11-17 04:37:19

只是生成 QR 码的简单且本机的方法：

(CIImage *)createQRForString:(NSString *)qrString {
NSData *stringData = [qrString dataUsingEncoding: NISOLatin1StringEncoding];
CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
[qrFilter setValue:stringData forKey:@"inputMessage"];
返回qrFilter.outputImage；
NSData *stringData =