RSPenrose

Original menu using a penrose triangle

It is a UIViewController container that show a Penrose triangle to change controller. With multiple options you can drag the from the top or the bottom, add a button on each side of the triangle, turn the triangle to change controller, etc.

This is just for fun.

Screenshots

How to use

1. Drag&Drop /RSPenrose folder in your project (With RSPenroseView - RSPenroseViewController - UIViewController+RSPenrose)
2. Create a subclass of RSPenroseViewController. I call it RootPenroseViewController.
3. In the Storyboard, create a blanck UIViewController and change it to a RootPenroseViewController.
4. In the Storyboard, add Storyboard Identifier to each other Controller you want, I have "FirstVC", "SecondVC" and "ThirdVC".
5. Add the following lines to RootPenroseViewController.m:

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // Add buttons
    [self addButtonsToTop:@"First" left:@"Second" right:@"Settings"];
    
    // Initializa main controller
    [self setMainControllerWithStoryboardID:@"FirstVC"];
    [self.penroseView selectSide:0];
}

6. Finally, to change controller when side is selected, add the following method (delegate method) :

#pragma mark - RSPenroseViewController Delegate
-(void)didSelectPenroseButtonAtIndex:(int)index
{
    switch (index) {
        case 0:
            [self setMainControllerWithStoryboardID:@"FirstVC"];
            [self.penroseView selectSide:0];
            break;
        case 1:
            [self setMainControllerWithStoryboardID:@"SecondVC"];
            [self.penroseView selectSide:1];
            break;
        case 2:
            [self setMainControllerWithStoryboardID:@"ThirdVC"];
            [self.penroseView selectSide:2];
            break;
        default:
            break;
    }
}

That's it !

Do More

You can use the following options to customize or change behaviour.

Change the side on which the triangle appears

Penrose can appear from Top (default) or Top Add this in RootPenroseViewController awakeFromNib

-(void)awakeFromNib
{
      // Change side appear
      [self setSide:RSPenroseSideAppearTop];
      // OR
      // [self setSide:RSPenroseSideAppearBottom];
}

Change colors

You can change the color of each side of the triangle and the selected side. Add this in RootPenroseViewController viewDidLoad

  // Sides Colors
      [self.penroseView setLeftColor:[UIColor colorWithRed:0.907806F green:0.922750F blue:0.919288F alpha:0.97F]];
      [self.penroseView setRightColor:[UIColor colorWithRed:0.907806F green:0.922750F blue:0.919288F alpha:0.97F]];
      [self.penroseView setTopColor:[UIColor colorWithRed:0.907806F green:0.922750F blue:0.919288F alpha:0.97F]];
      [self.penroseView setSelectColor:[UIColor colorWithRed:0.874510F green:0.945098F blue:0.929412F alpha:0.97F]];

And you can enable/disable if the selected side is with a different color :

      [self.penroseView setColorSelectedSide:YES];

Disable rotation

You can disable the ability to rotate triangle

      [self.penroseView setCanRotate:NO];

Appear/Disappear

Toggle/Change the state of the triangle with this methods

      [self.rootPenroseController togglePenroseView];
      [self.rootPenroseController hidePenroseView];
      [self.rootPenroseController showPenroseView];

And you can use the delegate methods in RootPenroseViewController :

-(void)didShowPenrose
{
    NSLog(@"Penrose Did Show");
}
-(void)didHidePenrose
{
    NSLog(@"Penrose Did Hide");
}

UIViewController+RSPenrose.h

Access to the RootPenroseViewController on each child controller. Just

 #import "UIViewController+RSPenrose.h"

And now you can do what you want !

      [self.rootPenroseController setSide:RSPenroseSideAppearTop];
      [self.rootPenroseController togglePenroseView];
      /* ... */

Different buttons

You have three ways to add buttons to the triangle :

• Basic, on each sides passing titles as parameters

      [self addButtonsToTop:@"First" left:@"Second" right:@"Settings"];

• Only on the top side passing titles as parameters

      [self addButtonsToPenroseViewWithTitles:@[@"First",@"Second",@"Settings"]];

• Or on your own way, passing UIButtons as parameters

      [self addButtonsToPenroseView:@[/* -- Array of UIButton -- */]];