half color rect

ViewController.m

//
//  ViewController.m
//  HalfColorRect
//
//  Created by MizushimaYusuke on 2017/06/11.
//  Copyright © 2017 MizushimaYusuke. All rights reserved.
//

#import "ViewController.h"
@import SpriteKit;

@interface ViewController ()
@property (nonatomic, weak) SKScene *scene;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self setupScene];
    [self createRect];
}

- (void)setupScene {
    SKView *sv = [[SKView alloc] initWithFrame:self.view.bounds];
    SKScene *s = [SKScene sceneWithSize:sv.frame.size];
    s.backgroundColor = [UIColor colorWithWhite:0.75 alpha:1];
    [sv presentScene:s];
    [self.view addSubview:sv];
    self.scene = s;
}

- (void)createRect {
    UIBezierPath *path = [UIBezierPath bezierPath];
    [path moveToPoint:CGPointMake(-60, -60)];
    [path addLineToPoint:CGPointMake(60, -60)];
    [path addLineToPoint:CGPointMake(60, 60)];
    [path closePath];
    
    for (int i=0; i<4; i++) {
        float hue = 0.2 * i;
        UIGraphicsBeginImageContextWithOptions(CGSizeMake(120, 120), NO, 0);
        CGContextRef ctx = UIGraphicsGetCurrentContext();
        CGContextTranslateCTM(ctx, 60, 60);
        [[UIColor colorWithHue:hue saturation:0.9 brightness:0.9 alpha:1] set];
        [path fill];
        
        CGContextRotateCTM(ctx, M_PI);
        [[UIColor colorWithHue:hue saturation:0.4 brightness:0.9 alpha:1] set];
        [path fill];
        
        UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        
        SKTexture *texture = [SKTexture textureWithImage:img];
        
        for (int j=0; j<3; j++) {
            SKSpriteNode *node =[SKSpriteNode spriteNodeWithTexture:texture];
            node.name = @"rect";
            node.position = CGPointMake(i * 120 + 150, CGRectGetMidY(self.view.bounds));
            node.xScale = 1.0 - j * 0.3;
            node.yScale = 1.0 - j * 0.3;
            node.zRotation = M_PI * j;
            [self.scene addChild:node];
        }
    }
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    [self.scene enumerateChildNodesWithName:@"rect" usingBlock:^(SKNode * _Nonnull node, BOOL * _Nonnull stop) {
        if ([node.name isEqual:@"rect"] && arc4random_uniform(5) == 0) {
            [node runAction:[SKAction rotateByAngle:M_PI * 0.5 duration:0.5]];
        }
    }];
}

@end

http://lepetit-prince.net/ios/?p=6361