iPhone QRCode encoding library

I need to create QRCode in my app and I used OBJQREncoder. I tried with the QRUI example within this, and it can encode about 0-20 characters.

When I increase the character count QRCode is disappeared from the 开发者_StackOverflow中文版screen(Blank Screen). I need to use this library in my app and need to encode about 40-50 chars. How can I over come this blank screen?

Try out this. This will increase the character count to 100 + [QREncoder encode:@"http://www.google.com/" size:6 correctionLevel:QRCorrectionLevelLow];