ios - 为什么我的 SpriteNode 没有被添加到场景中？

Question

我正在制作一个 SpriteNode 并尝试将其添加到场景中。即使我使用 [self addChild: child] 也不会显示。我只是看不出哪里出错了。这是我的 View Controller.m:

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Pause the view (and thus the game) when the app is interrupted or backgrounded
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleApplicationWillResignActive:) name:UIApplicationWillResignActiveNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleApplicationDidBecomeActive:)  name:UIApplicationDidBecomeActiveNotification  object:nil];

    // Configure the view.
    SKView * skView = (SKView *)self.view;
    skView.showsFPS = YES;
    skView.showsNodeCount = YES;

    // Create and configure the scene.
    SKScene * scene = [TitleScene sceneWithSize:skView.bounds.size];
    scene.scaleMode = SKSceneScaleModeAspectFill;

    // Present the scene.
    [skView presentScene:scene];
}

这是我的 Scene.m

- (void)viewWillAppear:(BOOL)animated
{
    SKView * skView = (SKView *)self.view;
    skView.showsFPS = YES;
    skView.showsNodeCount = YES;

    SKTexture *YellowLabelTexture = [SKTexture textureWithImageNamed:@"YellowLabel.png"];
    SKTexture *BlueLabelTexture = [SKTexture textureWithImageNamed:@"BlueLabel.png"];
    SKTexture *GreenLabelTexture = [SKTexture textureWithImageNamed:@"GreenLabel.png"];
    SKTexture *RedLabelTexture = [SKTexture textureWithImageNamed:@"RedLabel.png"];
    SKTexture *WhiteLabelTexture = [SKTexture textureWithImageNamed:@"WhiteLabel.png"];

     NSArray *anim = [NSArray arrayWithObjects:YellowLabelTexture, BlueLabelTexture, GreenLabelTexture, RedLabelTexture, WhiteLabelTexture, nil];

    SKSpriteNode *labelNode = [SKSpriteNode spriteNodeWithImageNamed:@"WhiteLabel.png"];
    labelNode.position = CGPointMake(160, 400);

    SKAction *actionAnimate = [SKAction animateWithTextures:anim timePerFrame:.5 resize:YES restore:NO];
    SKAction *actionRepeat = [SKAction repeatActionForever:actionAnimate];
    [self runAction:actionRepeat];

    [self addChild:labelNode];

}

有人能找出导致 Sprite 未添加到场景中的原因吗？另外，如何将它添加到场景中？谢谢!

Answer 1

正如@akashg 所说，您不能使用viewWillAppear 方法，而且您应该为labelNode 使用runAction:

[self runAction:actionRepeat]; 到 [labelNode runAction:actionRepeat];

您的代码应如下所示:

-(id)initWithSize:(CGSize)size {    
    if (self = [super initWithSize:size]) {
        /* Setup your scene here */


        SKView * skView = (SKView *)self.view;
        skView.showsFPS = YES;
        skView.showsNodeCount = YES;

        SKTexture *YellowLabelTexture = [SKTexture textureWithImageNamed:@"YellowLabel.png"];
        SKTexture *BlueLabelTexture = [SKTexture textureWithImageNamed:@"BlueLabel.png"];
        SKTexture *GreenLabelTexture = [SKTexture textureWithImageNamed:@"GreenLabel.png"];
        SKTexture *RedLabelTexture = [SKTexture textureWithImageNamed:@"RedLabel.png"];
        SKTexture *WhiteLabelTexture = [SKTexture textureWithImageNamed:@"WhiteLabel.png"];

        NSArray *anim = [NSArray arrayWithObjects:YellowLabelTexture, BlueLabelTexture, GreenLabelTexture, RedLabelTexture, WhiteLabelTexture, nil];

        SKSpriteNode *labelNode = [SKSpriteNode spriteNodeWithImageNamed:@"WhiteLabel.png"];
        labelNode.position = CGPointMake(160, 400);

        SKAction *actionAnimate = [SKAction animateWithTextures:anim timePerFrame:.5 resize:YES restore:NO];
        SKAction *actionRepeat = [SKAction repeatActionForever:actionAnimate];
        [labelNode runAction:actionRepeat];

        [self addChild:labelNode];

    }
    return self;
}

@end