iOSで画像からQRコードを読み取る ref: http://qiita.com/yoshida-k/items/78f2ef2ffa38361a73fa

file0.txt

-(BOOL)hasQRCode:(UIImage *)image
{
    ZBarImage *zbarimg = [[ZBarImage alloc] initWithCGImage:image.CGImage];
    ZBarImageScanner *scanner = [[ZBarImageScanner alloc] init];
    BOOL hasqr = [scanner scanImage:zbarimg];
    return hasqr;
}