SpriteKit里面，有几个关键的class：
SKView，理解为页面，也就是容纳场景（SKScene）的容器，相当于普通应用的View；
SKScene：场景，一些元素比如人物、武器都是通过场景展示给用户的；
SKView和SKScene的关系，通常用ViewController.m的这几句构造联系：
- (void)viewDidLoad //这个方法是关键
{
[super viewDidLoad];
SKView * skView = (SKView *)self.view;
skView.showsFPS= YES;
skView.showsNodeCount= YES;
//skView是视图
//------------------以下几句是联系：
SKScene * scene =[MyScene sceneWithSize:skView.bounds.size];
scene.scaleMode = SKSceneScaleModeAspectFill;
//skScene是场景
//Present the scene.
[skView presentScene:scene]; //添加场景
}
skLabelNode:理解为一个标签类，这样设置属性：
-(SKLabelNode*)newHelloNode //返回一个SKLabelNode
{
SKLabelNode *helloNode =[SKLabelNodelabelNodeWithFontNamed:@"Chalkduster"]; //设置字体
helloNode.name = @"helloNode"; //Key-Value系统
helloNode.text = @"游戏世界";
helloNode.fontSize= 44;
helloNode.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));
return helloNode;
}
skScene和skNode通常这样写：
-(void)createSceneContents
{
NSLog(@"createSceneContents");
self.backgroundColor = [SKColor blueColor];
self.scaleMode = SKSceneScaleModeAspectFit;
[self addChild:[self newHelloNode]];
}
-(SKLabelNode*)newHelloNode //返回一个SKLabelNode
{
SKLabelNode *helloNode =[SKLabelNodelabelNodeWithFontNamed:@"Chalkduster"]; //设置字体
helloNode.name = @"helloNode"; //Key-Value系统
helloNode.text = @"游戏世界";
helloNode.fontSize= 44;
helloNode.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));
return helloNode;
}
skAction:动画类，
SKAction *moveUp =[SKActionmoveByX:0 y:100 duration:0.5];
SKAction *zoom =[SKActionscaleTo:2 duration:0.25];
SKAction *pause =[SKActionwaitForDuration:0.5];
SKAction *fadeAway =[SKActionfadeOutWithDuration:0.25];
SKAction *remove =[SKActionremoveFromParent];
SKAction*moveSequence =[SKActionsequence:@[moveUp,zoom, pause, fadeAway, remove]]; //动画数组
skNode:对象类，skLabelNode的superClass，
SKNode *helloNode =[self childNodeWithName:@"helloNode"];
和SkAction之间的交互这样写：
[helloNode runAction:moveSequence completion:^{//......}];
skSpriteNode:精灵类，写的时候，继承自SKScene：
SKSpriteNode*spaceship =[self newSpaceship];
spaceship.position= CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));
[self addChild:spaceship];
-(SKSpriteNode*)newSpaceship //返回一个SKSpriteNode对象理解为里面的东东
{
SKSpriteNode *hull =[[SKSpriteNodealloc] initWithColor:[SKColor grayColor] size:CGSizeMake(33,24)];
SKAction *hover =[SKActionsequence:@[
[SKActionwaitForDuration:1.0],
[SKActionmoveByX:100y:50.0 duration:1.0],
[SKActionwaitForDuration:1.0],
[SKActionmoveByX:-100.0y:-50 duration:1.0]]];
//动作为hover
[hull runAction: [SKAction repeatActionForever:hover]];
SKSpriteNode*light1 = [self newLight];
light1.position= CGPointMake(-28.0,6.0); //参考系是ship
[hull addChild:light1];
SKSpriteNode*light2 = [self newLight];
light2.position= CGPointMake(28.0,6.0);
[hull addChild:light2]; //添加两个方块
hull.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:hull.size]; //重力影响掉落
hull.physicsBody.dynamic = NO; //重力影响取消
return hull;
}
- (SKSpriteNode*)newLight
{
SKSpriteNode *light =[[SKSpriteNodealloc] initWithColor:[SKColor yellowColor] size:CGSizeMake(8,8)];
SKAction *blink =[SKActionsequence:@[
[SKActionfadeOutWithDuration:0.25],
[SKActionfadeInWithDuration:0.25]]];
SKAction *blinkForever =[SKActionrepeatActionForever:blink];
[light runAction:blinkForever];
return light;
}
函数指针指向的方法：
staticinlineCGFloatskRandf()
{
return rand() / (CGFloat) RAND_MAX;
}
staticinlineCGFloatskRand(CGFloat low, CGFloat high)
{
return skRandf() * (high - low) + low;
}
- (void) addRock
{
SKSpriteNode *rock =[[SKSpriteNodealloc] initWithColor:[SKColor brownColor] size:CGSizeMake(8,8)];
rock.position = CGPointMake(skRand(0, self.size.width), self.size.height-50);
rock.name = @"rock";
rock.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:rock.size];
rock.physicsBody.usesPreciseCollisionDetection=YES;
//使用精确的检测碰撞
[self addChild:rock];
}
代码示例源于：http://blog.csdn.net/kobbbb/article/details/9093601
