在 Swift 中实现 SpriteKit 点击处理程序时的意外行为

Question

我在将 Objective-C 代码转换为 Swift 时遇到了一个问题。我在 SKScene 子类中添加了两个精灵。第一个子画面直接添加到场景中，第二个子画面是第一个节点的子节点。当我点击任一精灵时，游戏应该会记录精灵的名称。这在 Objective-C 版本中按预期工作，但无论我点击哪个节点，Swift 版本都会记录"sprite1"。

目标-C

声明精灵并将它们添加到场景中

    CGSize size = CGSizeMake(32, 32);
    SKSpriteNode *sprite1 = [SKSpriteNode spriteNodeWithColor:[SKColor blueColor] size:size];
    sprite1.name = @"sprite1";
    sprite1.position = CGPointMake(100, 100);
    [self addChild:sprite1];
    SKSpriteNode *sprite2 = [SKSpriteNode spriteNodeWithColor:[SKColor redColor] size:size];
    sprite2.name = @"sprite2";
    sprite2.position = CGPointMake(150, 100);
    [sprite1 addChild:sprite2];

触摸处理程序

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    /* Called when a touch begins */
    for (UITouch *touch in touches) {
        CGPoint location = [touch locationInNode:self];
        SKNode *node = [self nodeAtPoint:location];
        if ([node.name isEqualToString:@"sprite2"]) {
            NSLog(@"sprite2");
        }
        if ([node.name isEqualToString:@"sprite1"]) {
            NSLog(@"sprite1");
        }
    }
}

迅速

声明精灵并将它们添加到场景中

    let size = CGSizeMake(32, 32)
    let sprite1 = SKSpriteNode(color: SKColor.blueColor(), size: size)
    sprite1.name = "sprite1"
    sprite1.position = CGPointMake(100, 100)
    self.addChild(sprite1)
    let sprite2 = SKSpriteNode(color: SKColor.redColor(), size: size)
    sprite2.name = "sprite1"
    sprite2.position = CGPointMake(150, 100)
    sprite1.addChild(sprite2)

触摸处理程序

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    for touch: AnyObject in touches {
        let location = touch.locationInNode(self)
        let node = self.nodeAtPoint(location)
        if (node.name == "sprite2") {
            println("sprite2")
        }
        if (node.name == "sprite1") {
            println("sprite1")
        }
    }
}

Answer 1

您正在将sprite2.name设置为"sprite1"。

let size = CGSizeMake(32, 32)
    let sprite1 = SKSpriteNode(color: SKColor.blueColor(), size: size)
    sprite1.name = "sprite1"
    sprite1.position = CGPointMake(100, 100)
    self.addChild(sprite1)
    let sprite2 = SKSpriteNode(color: SKColor.redColor(), size: size)
    sprite2.name = "sprite1"  //here
    sprite2.position = CGPointMake(150, 100)
    sprite1.addChild(sprite2)

将其更改为"精灵2"。

let size = CGSizeMake(32, 32)
    let sprite1 = SKSpriteNode(color: SKColor.blueColor(), size: size)
    sprite1.name = "sprite1"
    sprite1.position = CGPointMake(100, 100)
    self.addChild(sprite1)
    let sprite2 = SKSpriteNode(color: SKColor.redColor(), size: size)
    sprite2.name = "sprite2"
    sprite2.position = CGPointMake(150, 100)
    sprite1.addChild(sprite2)