Sprite kit - 使用 tochesMoved 沿 x 移动节点

Question

我有一个 Box 节点，我只想通过向左或向右滑动来左右移动它。 下面代码的问题在于，一旦发生触摸，Box 就会明显跳到触摸的 x 位置，然后它会随着您的手指移动。

不错，但这不是我想要的效果，如果触摸发生（无论屏幕上的哪个位置），框都会保持在原位，并且只会相应地左右移动（- 或 x 的值触摸的位置）并且最初不要跳到手指的位置。所以 BoxNewPostion.postion.x 不应该真的等于 touchLocation.x

只是补充一点，如果我尝试，Box 会快速闪烁

CGPoint BoxNewPosition = CGPointMake(touchLocation.x - Box.postion.x, Box.position.y); 

看起来好像延迟计算和减去 x 位置。

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

        UITouch *touch = [[event allTouches] anyObject];

        CGPoint touchLocation = [touch locationInView:self.view];


        SKSpriteNode* Box = (SKSpriteNode*)[self childNodeWithName:@"BoxNode"];

        CGPoint BoxNewPosition = CGPointMake(touchLocation.x, Box.position.y);

        Box.position = BoxNewPosition;

}

Answer 1

您可以将以下代码更改为仅在 x 轴上移动。

@implementation MyScene
{
    SKSpriteNode *object1;
    CGPoint destinationLocation;
}

-(id)initWithSize:(CGSize)size
{
    if (self = [super initWithSize:size])
    {
        [self createObject];
        destinationLocation = CGPointMake(300, 150);
    }
    return self;
}

-(void)createObject
{
    object1 = [SKSpriteNode spriteNodeWithColor:[SKColor redColor] size:CGSizeMake(50, 50)];
    object1.position = CGPointMake(300, 150);
    [self addChild:object1];
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    destinationLocation = [touch locationInNode:self.scene];
}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    destinationLocation = [touch locationInNode:self.scene];
}

-(void)update:(CFTimeInterval)currentTime
{
    float x = fabs(object1.position.x - destinationLocation.x);
    float y = fabs(object1.position.y - destinationLocation.y);

    float divider = 0;
    if(x > y)
    {
        divider = x;
    } else
    {
        divider = y;
    }

    float xMove = (x/divider)*8; // change number to increase or decrease speed
    float yMove = (y/divider)*8; // change number to increase or decrease speed

    if(object1.position.x > destinationLocation.x)
        object1.position = CGPointMake(object1.position.x-xMove, object1.position.y);

    if(object1.position.x < destinationLocation.x)
        object1.position = CGPointMake(object1.position.x+xMove, object1.position.y);

    if(object1.position.y > destinationLocation.y)
        object1.position = CGPointMake(object1.position.x, object1.position.y-yMove);

    if(object1.position.y < destinationLocation.y)
        object1.position = CGPointMake(object1.position.x, object1.position.y+yMove);
}

@end