Sprite Kit - 将对象移动到触摸位置

Question

我的场景中有一个物体.当我触摸屏幕时,我希望对象的y位置成为我触摸的y位置.为此,我有以下代码:

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

    SKNode *player = [self childNodeWithName:@"player"];

    UITouch *touch = [touches anyObject];
    CGPoint positionInScene = [touch locationInNode:self];
    player.position = CGPointMake(player.position.x, positionInScene.y);
}

它适用于此代码,但如何让对象以稳定的速度移动到触摸位置？因此,不是跳到触摸y位置,而是以预定义的速度移动到它.

Answer 1

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

    SKNode *player = [self childNodeWithName:@"player"];

    UITouch *touch = [touches anyObject];
    CGPoint positionInScene = [touch locationInNode:self];

  // Determine speed
int minDuration = 2.0;
int maxDuration = 4.0;
int rangeDuration = maxDuration - minDuration;
int actualDuration = (arc4random() % rangeDuration) + minDuration;

// Create the actions
SKAction * actionMove = [SKAction moveTo:CGPointMake(player.position.x, positionInScene.y); duration:actualDuration];
[player runAction:actionMove];

}