矢印を落とすと、四角がその方向に動くといったiPhoneアプリのサンプルコードを描いてみます。
#import “ViewController.h”
#import <SpriteKit/SpriteKit.h>
@interface ArrowScene : SKScene
@end
@implementation ArrowScene
– (void)didMoveToView:(SKView *)view
{
self.backgroundColor = [SKColor whiteColor];
self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:self.frame];
self.physicsBody.dynamic = NO;
[self createLines];
[self createArrows];
[self createPlayer];
}
– (void)createLines
{
for (int i=0; i<11; i++) {
[self createLine:CGPointMake(i * 22+ 80, 100)];
}
}
– (void)createArrows
{
NSArray *arrows = @[@”↓”, @”↑”, @”←”, @”→”];
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(-20, –20, 40, 40) cornerRadius:5];
for (int i=0; i<4; i++) {
SKShapeNode *btn = [SKShapeNode node];
btn.position = CGPointMake(CGRectGetMaxX(self.frame) – 30, i * 50 + 200);
btn.name = @”button”;
btn.path = path.CGPath;
btn.fillColor = [SKColor whiteColor];
btn.strokeColor = [SKColor orangeColor];
btn.lineWidth = 5;
[self addChild:btn];
SKLabelNode *l = [SKLabelNode node];
l.text = arrows[i];
l.fontColor = [SKColor orangeColor];
l.horizontalAlignmentMode = SKLabelHorizontalAlignmentModeCenter;
l.verticalAlignmentMode = SKLabelVerticalAlignmentModeCenter;
[btn addChild:l];
}
}
-(void)createLine:(CGPoint)p
{
SKSpriteNode *node = [SKSpriteNode spriteNodeWithColor:[SKColor grayColor] size:CGSizeMake(10, 10)];
node.name = @”line”;
node.position = p;
[self addChild:node];
node.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:node.size];
SKPhysicsJointSliding *s = [SKPhysicsJointSliding jointWithBodyA:node.physicsBody bodyB:self.physicsBody anchor:node.position axis:CGVectorMake(1, 0)];
[self.physicsWorld addJoint:s];
}
– (void)createPlayer
{
SKSpriteNode *back = [SKSpriteNode spriteNodeWithColor:[SKColor greenColor] size:CGSizeMake(250, 250)];
back.position = CGPointMake(125, CGRectGetMaxY(self.frame) – 155);
[self addChild:back];
SKSpriteNode *player = [SKSpriteNode spriteNodeWithColor:[SKColor yellowColor] size:CGSizeMake(30, 30)];
player.name = @”player”;
player.position = CGPointMake(160,260);
[self addChild:player];
}
– (void)update:(NSTimeInterval)currentTime
{
[self enumerateChildNodesWithName:@”line” usingBlock:^(SKNode *node, BOOL *stop) {
node.physicsBody.velocity = CGVectorMake(-20, 0);
if (node.position.x < 78) {
[node removeFromParent];
[self createLine:CGPointMake(CGRectGetMaxX(self.frame)-3, node.position.y)];
}
}];
SKNode *player = [self childNodeWithName:@”player”];
[self enumerateChildNodesWithName:@”↑” usingBlock:^(SKNode *node, BOOL *stop) {
if (node.position.y < 30) {
node.name = @””;
[player runAction:[SKAction moveByX:0 y:30 duration:0.5]];
[node runAction:[SKAction fadeOutWithDuration:0.3] completion:^{
[node removeFromParent];
}];
}
}];
[self enumerateChildNodesWithName:@”→” usingBlock:^(SKNode *node, BOOL *stop) {
if (node.position.y < 30) {
node.name = @””;
[player runAction:[SKAction moveByX:30 y:0 duration:0.5]];
[node runAction:[SKAction fadeOutWithDuration:0.3] completion:^{
[node removeFromParent];
}];
}
}];
[self enumerateChildNodesWithName:@”↓” usingBlock:^(SKNode *node, BOOL *stop) {
if (node.position.y < 30) {
node.name = @””;
[player runAction:[SKAction moveByX:0 y:-30 duration:0.5]];
[node runAction:[SKAction fadeOutWithDuration:0.3] completion:^{
[node removeFromParent];
}];
}
}];
[self enumerateChildNodesWithName:@”←” usingBlock:^(SKNode *node, BOOL *stop) {
if (node.position.y < 30) {
node.name = @””;
[player runAction:[SKAction moveByX:-30 y:0 duration:0.5]];
[node runAction:[SKAction fadeOutWithDuration:0.3] completion:^{
[node removeFromParent];
}];
}
}];
}
– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint p = [[touches anyObject] locationInNode:self];
[self enumerateChildNodesWithName:@”button” usingBlock:^(SKNode *node, BOOL *stop) {
if ([node containsPoint:p]) {
SKNode *copy = [node copy];
[self addChild:copy];
copy.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(40, 40)];
copy.physicsBody.allowsRotation = NO;
SKLabelNode *l = copy.children[0];
l.verticalAlignmentMode = SKLabelVerticalAlignmentModeCenter;
copy.name = l.text;
}
}];
}
@end
@interface ViewController ()
@end
@implementation ViewController
– (void)viewDidLoad
{
[super viewDidLoad];
SKView *spriteView = [[SKView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:spriteView];
SKScene *scene = [[ArrowScene alloc] initWithSize:spriteView.frame.size];
[spriteView presentScene:scene];
}
@end