iPhone 动画 - 将视图移动一圈

Question

有没有办法在不使用视图动画旋转视图的情况下围绕中心点移动视图？

   A

A  C  A

   A

Answer 1

    #import <QuartzCore/QuartzCore.h>
    #define degreesToRadians(deg) (deg / 180.0 * M_PI)

Manualy ：

-(CGPoint)setPointToAngle:(int)angle center:(CGPoint)centerPoint radius:(double)radius
 {
    return CGPointMake(radius*cos(degreesToRadians(angle)) + centerPoint.x, radius*sin(degreesToRadians(angle)) + centerPoint.y);
 }

带有类似这样的动画：

    int angle = 0; // start angle position 0-360 deg
    CGPoint center = self.view.center;
    CGPoint start = [self setPointToAngle:angle center:center radius:radius]; //point for start moving
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, start.x, start.y);

    for(int a =0;a<4;a++) //set path points for 90, 180, 270,360 deg form begining angle
    {
        angle+=45;
        expPoint = [self setPointToAngle:angle center:center radius:expRadius];
        angle+=45;
        start = [self setPointToAngle:angle center:center radius:radius];
        CGPathAddQuadCurveToPoint(path, NULL,expPoint.x, expPoint.y, start.x, start.y);
    }

    CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    pathAnimation.removedOnCompletion = NO;
    pathAnimation.path = path;
    [pathAnimation setCalculationMode:kCAAnimationCubic];
    [pathAnimation setFillMode:kCAFillModeForwards];
    pathAnimation.duration = 14.0; 

    [MY_VIEW.layer addAnimation:pathAnimation forKey:nil];

也看看

CGPathAddQuadCurveToPoint, 
CGPathAddCurveToPoint, 
CGPathAddArcToPoint, 
CGPathAddArc 

和其他

Answer 2

放入动画线程并在每一帧手动移动它并不是什么大问题，所以这就是我所做的。