threema-ios/Vendor/QRCodeEncoder/QRCodeEncoderObjectiveCAtGithub/QRCodeEncoderDemoViewController.mm

#import "QRCodeEncoderDemoViewController.h"


@implementation QRCodeEncoderDemoViewController

- (void)dealloc
{
    [super dealloc];
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    
    //the qrcode is square. now we make it 250 pixels wide
    int qrcodeImageDimension = 250;
    
    //the string can be very long
    NSString* aVeryLongURL = @"http://thelongestlistofthelongeststuffatthelongestdomainnameatlonglast.com/";
    
    //first encode the string into a matrix of bools, TRUE for black dot and FALSE for white. Let the encoder decide the error correction level and version
    DataMatrix* qrMatrix = [QREncoder encodeWithECLevel:QR_ECLEVEL_AUTO version:QR_VERSION_AUTO string:aVeryLongURL];
    
    //then render the matrix
    UIImage* qrcodeImage = [QREncoder renderDataMatrix:qrMatrix imageDimension:qrcodeImageDimension];
    
    //put the image into the view
    UIImageView* qrcodeImageView = [[UIImageView alloc] initWithImage:qrcodeImage];
    CGRect parentFrame = self.view.frame;
    CGRect tabBarFrame = self.tabBarController.tabBar.frame;
    
    //center the image
    CGFloat x = (parentFrame.size.width - qrcodeImageDimension) / 2.0;
    CGFloat y = (parentFrame.size.height - qrcodeImageDimension - tabBarFrame.size.height) / 2.0;
    CGRect qrcodeImageViewFrame = CGRectMake(x, y, qrcodeImageDimension, qrcodeImageDimension);
    [qrcodeImageView setFrame:qrcodeImageViewFrame];
    
    //and that's it!
    [self.view addSubview:qrcodeImageView];
    [qrcodeImageView release];
}

@end