ios - SKSpriteNode 的动画旋转

Question

我正在尝试旋转一个 SKSpriteNode 以面向 CGPoint 的方向。我已经设法这样做了:

CGPoint direction = rwNormalize(offset);

self.player.zRotation = atan2f(direction.y, direction.x);

我该如何调用它，以便 SKSpriteNode 为其旋转设置动画而不是瞬时旋转。无论 Sprite 应该转向哪里，是否也可以在动画中保持相同的旋转速度？提前致谢!

Answer 1

使用SKAction:

CGPoint direction = rwNormalize(offset);
float angle = atan2f(direction.y, direction.x);
// Speed of rotation (radians per second)
float speed = 2.0;

float duration = angle > M_PI_2 ? angle/speed : (angle + M_PI_2)/speed;
[self.player runAction:
    [SKAction rotateToAngle:angle duration:duration]];