tomohisa

// add child view
    UIViewController* controller = [self.storyboard instantiateViewControllerWithIdentifier:@"test"];
    [self addChildViewController:controller];
    controller.view.frame = CGRectMake(0, 44, 320, 320);
    [self.view addSubview:controller.view];
    [controller didMoveToParentViewController:self];

// remove child view
    UIViewController *vc = [self.childViewControllers lastObject];
    [vc.view removeFromSuperview];

snej

#if TARGET_OS_IPHONE
#import <UIKit/UIKit.h>
typedef UIImage QRImage;
#else
#import <AppKit/AppKit.h>
typedef NSImage QRImage;
#endif


+ (QRImage*) QRCodeImageWithData: (NSData*)data size: (CGFloat)size {

socketbox

Attributions

These instructions are an amalgam of steps presented by Wired’s Robbie Gonzalez, Phil of thecubicle.com, and JPerm of YouTube fame.

Definitions

A right trigger is R U R'

A left trigger is L' U' L

An r-alg is R U R' U'