动画化SKSpriteNode的旋转 [英] Animate rotation of SKSpriteNode

问题描述

我正在尝试旋转 SKSpriteNode 以面向 CGPoint 的方向.我已经做到了这样:

I am attempting to rotate an SKSpriteNode to face the direction of a CGPoint. I have managed to do this like so:

CGPoint direction = rwNormalize(offset);

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

我怎么称呼它，以使 SKSpriteNode 可以动画化其旋转，而不是瞬时旋转.不管精灵应该旋转到什么位置，动画中还能保持相同的旋转速度吗?预先感谢！

How would I call this so that the SKSpriteNode will animate its rotation rather than it being instantaneous. Would it also be possible to keep the same speed of rotation in the animation no matter where the sprite should turn? Thanks in advance!

推荐答案

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]];

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