//old method
// public UIImage GetQRCodeImageByString(string sourceStr,QRCodeCorrectionLevel level = QRCodeCorrectionLevel.H)
// {
// CIQRCodeGenerator qrGen = new CIQRCodeGenerator ();
// qrGen.Message = NSData.FromString (sourceStr);
// qrGen.CorrectionLevel = level.ToString();
//
// var output = new CILanczosScaleTransform {
// Image = qrGen.OutputImage,
// Scale = 1
// }.OutputImage;
//
// var context = CIContext.FromOptions(null);
// UIImage img = UIImage.FromImage (context.CreateCGImage (output, output.Extent));
// Console.WriteLine ("output.Extent.Size="+output.Extent.Size);
// Console.WriteLine ("img.Size="+img.Size);
// return img;
// }
public UIImage GetQRCodeImageByString(string sourceStr, nfloat length, QRCodeCorrectionLevel level = QRCodeCorrectionLevel.M)
{
NSString nsStr = new NSString(sourceStr);
CIImage ciImage = CreateQRForString(nsStr, level);
return(CreateNonInterpolatedUIImageFormCIImage(ciImage, length));
}
CIImage CreateQRForString(NSString qrString, QRCodeCorrectionLevel level)
{
NSData strData = qrString.Encode(NSStringEncoding.UTF8);
// 创建filter
CIFilter qrFilter = CIFilter.FromName("CIQRCodeGenerator");
// 设置内容和纠错级别
qrFilter.SetValueForKey(strData, new NSString("inputMessage"));
qrFilter.SetValueForKey(new NSString(level.ToString()), new NSString("inputCorrectionLevel"));
// 返回CIImage
return(qrFilter.OutputImage);
}
