Working with Dictionaries. This example shows how to pass a dictionary between two objects (in this case 2 workspaces). In the main workspace we build the dictionary. In the second workspace we read from the dictionary and build a shape with its variables.

C4WorkSpace.m

//
//  C4WorkSpace.m
//  C4Code
//
//  Created by Travis Kirton on 11/4/2013.
//

#import "MyWorkSpace.h"

@interface C4WorkSpace ()
@property (nonatomic) MyWorkSpace *myWorkSpace;
@end

@implementation C4WorkSpace

-(void)setup {
    self.myWorkSpace = [[MyWorkSpace alloc] init];
    self.myWorkSpace.canvas.frame = CGRectMake(0, 0, 384, 256);
    self.myWorkSpace.canvas.center = self.canvas.center;
    [self.myWorkSpace setup];
    [self.canvas addSubview:self.myWorkSpace.canvas];
    
    C4Shape *circle = [C4Shape ellipse:CGRectMake(0, 0, 100, 100)];
    circle.center = CGPointMake(self.canvas.center.x, 75);
    circle.fillColor = C4RED;
    circle.strokeColor = C4BLUE;
    circle.lineWidth = 20.0f;
    [self.canvas addShape:circle];
    
    NSDictionary *shapeDictionary = @{
        @"size":[NSValue valueWithCGSize:circle.frame.size],
        @"fillColor":circle.fillColor,
        @"strokeColor":circle.strokeColor,
        @"lineWidth":@(circle.lineWidth)
    };
    
    self.myWorkSpace.shapeDictionary = shapeDictionary;
}

-(BOOL)prefersStatusBarHidden {
    return YES;
}

@end

MyWorkSpace.h

//
//  MyWorkSpace.h
//  C4Code
//
//  Created by moi on 11/4/2013.
//  Copyright (c) 2013 moi. All rights reserved.
//

#import "C4WorkSpace.h"

@interface MyWorkSpace : C4WorkSpace
@property (nonatomic) NSDictionary *shapeDictionary;
@end

MyWorkSpace.m

//
//  MyWorkSpace.m
//  C4Code
//
//  Created by moi on 11/4/2013.
//  Copyright (c) 2013 moi. All rights reserved.
//

#import "MyWorkSpace.h"

@interface MyWorkSpace ()

@end

@implementation MyWorkSpace

-(void)setup {
    self.canvas.backgroundColor = C4GREY;
}

-(void)setShapeDictionary:(NSDictionary *)shapeDictionary {
    _shapeDictionary = shapeDictionary;
    
    CGSize size = [shapeDictionary[@"size"] CGSizeValue];
    //I change it to a rect here...
    C4Shape *newShape = [C4Shape rect:CGRectMake(0, 0, size.width, size.height)];
    
    newShape.fillColor = shapeDictionary[@"fillColor"];
    newShape.strokeColor = shapeDictionary[@"strokeColor"];
    newShape.lineWidth = [shapeDictionary[@"lineWidth"] floatValue];
    
    newShape.center = CGPointMake(self.canvas.width / 2.0f, self.canvas.height / 2.0f);
    [self.canvas addShape:newShape];
}

@end