ios创建二维码

#import "LCTwoCodeImage.h"

 

@implementation LCTwoCodeImage

 

 

+(UIImage *) GotoCreatMyTwoCode :(NSString *) string {

    //通过传入的字符串来创建二维码初始图层渲染

    CIImage * firstImage = [self creatCIImageFromString:string];

    //通过 CIImage 来生成二维码

    UIImage * qrCode = [self createNonInterpolatedUIImageFormCIImage:firstImage withSize:250.0f];

    

    return qrCode;

}

 

 

+(UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size {

    CGRect extent = CGRectIntegral(image.extent);

    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));

    // create a bitmap image that we'll draw into a bitmap context at the desired size;

    size_t width = CGRectGetWidth(extent) * scale;

    size_t height = CGRectGetHeight(extent) * scale;

    CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();

    CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);

    CIContext *context = [CIContext contextWithOptions:nil];

    CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];

    CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);

    CGContextScaleCTM(bitmapRef, scale, scale);

    CGContextDrawImage(bitmapRef, extent, bitmapImage);

    // Create an image with the contents of our bitmap

    CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);

    // Cleanup

    CGContextRelease(bitmapRef);

    CGImageRelease(bitmapImage);

    return [UIImage imageWithCGImage:scaledImage];

}

 

+(CIImage *)creatCIImageFromString:(NSString *) string {

    NSData * stringData = [string dataUsingEncoding:NSUTF8StringEncoding];

    //添加图层

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

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

    [qrFiler setValue:@"M" forKey:@"inputCorrectionLevel"];

    return [qrFiler outputImage];

}

 

 

 

 

@end