相关疑难解决方法(0)

目标:我想呈现一个新场景:

[self.scene.view presentScene:level2 transition:reveal];

并结束当前的背景音乐以启动新的背景音乐(2级的新背景音乐).

问题:在呈现新场景时,1.场景(level1)的背景音乐一直在播放,即使在离开迷你游戏时也不会停止,因为整个游戏由几个迷你游戏组成.

播放的音乐是SKAction:

@implementation WBMAnimalMiniGameLvL1

    -(id)initWithSize:(CGSize)size {    
        if (self = [super initWithSize:size])
        {
            /* Setup your scene here */
        self.temporaryScore = 0;
        self.animalSKSprites = [[WBMAnimalsMiniGameModel alloc] init];
        self.backgroundImage = [SKSpriteNode spriteNodeWithImageNamed:@"farmBackground1024x768.png"];
        self.backgroundImage.position = CGPointMake(CGRectGetMidX(self.frame),
                                       CGRectGetMidY(self.frame));
        self.temporaryStartingPointIndex = -1;
        [self addChild:self.backgroundImage];
        self.playBackgroundSound = [SKAction playSoundFileNamed:@"farm.mp3" waitForCompletion:NO];

        //SKAction *repeat = [SKAction repeatActionForever:playSound];
        [self runAction:self.playBackgroundSound withKey:@"play"];

        [self drawAllAnimalsOntoScreen];

    }
    return self;
}

这是向下一级别的过渡发生的:

-(void)transitionToNextLevel
{
    NSLog(@"transitionToNextLevel");
    SKTransition *reveal = [SKTransition moveInWithDirection:SKTransitionDirectionDown duration:0.5];
    //SKView *skView = (SKView *)self.view;
    SKScene *level2 …

当我使用[self playSoundFileNamed]播放声音时,第一次播放声音会有一个小延迟,整个应用程序冻结大约半秒钟,但之后就没问题了.我怎么能摆脱这个？