clothespins

ViewController.m

//
//  ViewController.m
//  Clothespins
//
//  Created by MizushimaYusuke on 2017/10/10.
//  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 createClothepins];
}

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

- (void)createClothepins {
    float dx = CGRectGetMaxX(self.view.bounds) / 9.0;
    for (int i=1; i<9; i++) {
        SKNode *pin = [self createClothepin];
        pin.position = CGPointMake(dx * i, self.view.center.y);
        pin.name = @"pin";
    }
}

- (SKNode *)createClothepin {
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(20, 50), false, 0);
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    UIBezierPath *path = [UIBezierPath bezierPath];
    [path moveToPoint:CGPointZero];
    [path addLineToPoint:CGPointMake(8, 30)];
    [path addLineToPoint:CGPointMake(10, 50)];
    [path addLineToPoint:CGPointMake(0, 50)];
    [path closePath];
    [[UIColor whiteColor] set];
    [path fill];
    
    float hue = arc4random_uniform(10) * 0.1;
    [[UIColor colorWithHue:hue saturation:0.8 brightness:1 alpha:1] set];
    CGContextSetLineWidth(ctx, 3);
    CGContextStrokeEllipseInRect(ctx, CGRectMake(7, 25, 6, 6));
    CGContextSetBlendMode(ctx, kCGBlendModeClear);
    CGContextFillEllipseInRect(ctx, CGRectMake(7, 40, 10, 10));
    
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    SKTexture *texture = [SKTexture textureWithImage:img];
    
    SKNode *pin = [SKNode node];
    [self.scene addChild:pin];
    
    for (int i=0; i<2; i++) {
        SKSpriteNode *n = [SKSpriteNode spriteNodeWithTexture:texture];
        [pin addChild:n];
        
        if (i==0) {
            n.xScale = n.xScale * -1;
            [n runAction:[SKAction repeatActionForever:[SKAction sequence:@[[SKAction rotateByAngle:0.3 duration:1.0],  [SKAction rotateByAngle:-0.3 duration:1.0]]]]];
        } else {
            [n runAction:[SKAction repeatActionForever:[SKAction sequence:@[[SKAction rotateByAngle:-0.3 duration:1.0],  [SKAction rotateByAngle:0.3 duration:1.0]]]]];
        }
    }
    
    return pin;
}

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

@end

http://lepetit-prince.net/ios/?p=6733