Question

我正在试图弄清楚如何知道用户是否正在接触精灵。

我将我的代码简化为裸骨，在init上我创建了一个名为“button”的精灵，然后我试着知道用户何时触摸它/停止触摸。

这就是我现在正在尝试的事情：

-(id)initWithSize:(CGSize)size {    
    if (self = [super initWithSize:size]) {
        self.backgroundColor = [SKColor colorWithRed:0 green:0 blue:0 alpha:1.0];

        // Add button
        SKSpriteNode *sprite = [SKSpriteNode spriteNodeWithImageNamed:@"button"];
        sprite.name = @"button";
        sprite.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));
        [self addChild:sprite];
    }
    return self;
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];
    SKNode *node = [self nodeAtPoint:location];
    if ([node.name isEqualToString:@"button"]) {
        NSLog(@"Started touch on sprite");
    }
}

-(void)update:(CFTimeInterval)currentTime {
/* Called before each frame is rendered */
}

然而，虽然我可以判断按钮是否开始触摸，但我无法判断用户是否结束了触摸或移出了精灵（或者是副本）。我怎么能这样做？

Answer 1

你也可以像这样节点的框架：

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint touchLocation = [touch locationInNode:self.scene];
    if (CGRectContainsPoint(sprite.frame, touchLocation))
    {
        // do something
    }
}

Answer 2

添加到属性:(允许您以各种方法访问它们）

@property (nonatomic) BOOL touchInSprite;
@property (nonatomic) SKSpriteNode * sprite;
@end

添加方法：

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch * touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];

    if ([self.sprite containsPoint: location])                
        self.touchInSprite = true;      
    else
        self.touchInSprite = false;
}

 - (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch * touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];

    if ([self.sprite containsPoint: location]) 
    {               
        self.touchInSprite = true;  
    }    
    else
    {
        self.touchInSprite = false;
        //user stop touches it
    }
}

 - (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch * touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];

    if (self.startTouchValid == true)                
    {
    //Perform action
    }    
}

如何检测精灵是否被触摸？

2 个答案: