二维码生成

/**

*  生成二维码

*

*  @param code

*  @param width

*  @param height

*

*  @return

*/

+ (UIImage *)generateBarCode:(NSString *)code width:(CGFloat)width height:(CGFloat)height fileName:(NSString *)fileName{

CIImage *qrcodeImage;

NSData *data = [code dataUsingEncoding:NSISOLatin1StringEncoding allowLossyConversion:false];

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

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

[filter setValue:@"H" forKey:@"inputCorrectionLevel"];

qrcodeImage = [filter outputImage];

// 消除模糊

CGFloat scaleX = width / qrcodeImage.extent.size.width; // extent 返回图片的frame

CGFloat scaleY = height / qrcodeImage.extent.size.height;

CIImage *transformedImage = [qrcodeImage imageByApplyingTransform:CGAffineTransformScale(CGAffineTransformIdentity, scaleX, scaleY)];

return [UIImage imageWithCIImage:transformedImage];

}