ios - 曲线动画的旋转方向？

Question

在我的应用程序中，我使用以下动画使我的 UIElement 沿顺时针方向沿着圆形路径移动

CGMutablePathRef path = CGPathCreateMutable(); 
CGPathAddArc(path, NULL,viewFormsUI.center.x,viewFormsUI.center.y, 
                     88,radianOf(243),radianOf(0), YES); //viewFormsUI is an UIView 
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"]; 
[animation setPath:path]; 
[animation setDuration:1];
animation.removedOnCompletion = YES;
animation.fillMode = kCAFillModeForwards; 
[animation setAutoreverses:NO];
CFRelease(path); 
[btnRefreshUI.layer addAnimation:animation forKey:@"curveAnimation"];
                             //btnRefreshUI is an UIButton

radianOf 是一个将角度转换为弧度的函数(只返回 M_PI*(angle/180) 的值)

但问题是 UIElement 是逆时针旋转的。我在我的代码中找不到错误，请帮助我。

Answer 1

CGPathAddArc(path, NULL, viewFormsUI.center.x, viewFormsUI.center.y, 88, radianOf(243), radianOf(0), YES);

尝试将 YES 更改为 NO

CGPathAddArc(path, NULL, viewFormsUI.center.x, viewFormsUI.center.y, 88, 弧度(243), 弧度(0), 没有);

这是顺时针 bool