我有一个场景，我需要通过双击呈现另一个场景，但它不起作用（（我在哪里犯错或者我知道有什么问题？那个代码：
-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
/* Setup your scene here */
self.backgroundColor = [SKColor colorWithRed:0.15 green:0.15 blue:0.3 alpha:1.0];
SKLabelNode *myLabel = [SKLabelNode labelNodeWithFontNamed:@"Chalkduster"];
myLabel.text = @"Kill Them All!";
myLabel.fontSize = 30;
myLabel.position = CGPointMake(CGRectGetMidX(self.frame),
CGRectGetMidY(self.frame));
myLabel.alpha = -2;
SKAction *fadeIn = [SKAction fadeInWithDuration:9.0];
[myLabel runAction:fadeIn];
[self addChild:myLabel];
UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTap)];
doubleTap.numberOfTapsRequired = 2;
[self.view addGestureRecognizer:doubleTap];
}
return self;}
-(void)doubleTap{
NewScene *newScene = [[NewScene alloc] initWithSize:self.view.bounds.size];
SKTransition *doors = [SKTransition doorsOpenVerticalWithDuration:1.0];
[self.view presentScene:newScene transition:doors];}