重启后,Sprite Kit暂停/恢复场景不起作用

时间:2014-07-15 03:48:06

标签: ios objective-c sprite-kit

我有一个游戏,当按下主页按钮时我已经成功实现了暂停功能。在具有主场景的View Controller中,我暂停使用:

- (void)appWillEnterBackground{
SKView *skView = (SKView *)self.view;
skView.paused = YES;
bubbleOn=NO; //turns bubble spawn off

[[NSNotificationCenter defaultCenter] removeObserver:self];
[[NSNotificationCenter defaultCenter]
 addObserver:self
 selector:@selector(appWillEnterForeground)
 name:UIApplicationDidBecomeActiveNotification
 object:NULL];
 }   

要取消暂停,

- (void)appWillEnterForeground{
SKView * skView = (SKView *)self.view;
skView.paused=NO;
bubbleOn=YES; Allows recursive method to run until bubbleOn = YES
[NSTimer scheduledTimerWithTimeInterval:slowMo target:scene selector:@selector(spawnNew) userInfo:nil repeats:NO]; //Recursive spawn method

[[NSNotificationCenter defaultCenter] removeObserver:self];
[[NSNotificationCenter defaultCenter]
 addObserver:self
 selector:@selector(appWillEnterBackground)
 name:UIApplicationWillResignActiveNotification
 object:NULL];}

这很有效,直到我的游戏结束并呈现新的场景(结束场景)。在结束场景显示得分之后,用户可以再次点击以再次开始并且呈现主场景。主场景的 initWithSize 方法开始递归方法 spawnNew 。如果应用程序进入后台,场景会暂停并生成新的停止。

但是当应用程序转到前台时,场景会恢复,但 spawnNew 方法不起作用。它被调用并输出正确的NSLog消息,但该方法不会产生气泡节点。

spawnNew方法在我的主场景的实现中:

-(void) spawnNew{
if (bubbleOn==YES){
    bubble = [SKSpriteNode spriteNodeWithImageNamed:ballName];
    bubble.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:bubble.size.width/2];
    ...
    //bubble properties
    ...
    [self addChild:bubble];
    NSLog(@"Spawn!");

    [NSTimer scheduledTimerWithTimeInterval:slowMo target:self selector:@selector(spawnNew) userInfo:nil repeats:NO];

    return;
} else{
    return;
}

此时我没有想法!有什么建议?

1 个答案:

答案 0 :(得分:3)

最简单的方法是摆脱NSTimer。您可以改为使用SKAction

使用SKScene initWithSize方法:

- (instancetype)initWithSize:(CGSize)size {
    if (self = [super initWithSize:size]) {
        ....

        __weak GameScene *weakSelf = self;
        SKAction *spawnBubble = [SKAction runBlock:^{
            [weakSelf spawnNew];
        }];
        SKAction *wait = [SKAction waitForDuration:slowMo];
        [self runAction:[SKAction repeatActionForever:
            [SKAction sequence:@[spawnBubble,wait]]]];
    }
    return self;
}

在这种情况下,您甚至不需要使用bubbleOn变量,因为一旦SKView暂停,场景就会停止执行任何操作。