UIView 曲線動畫Sample code

       CGPoint endpoint=[self.view convertPoint:point1 fromView:carBG];
       UIBezierPath *path=[UIBezierPath bezierPath];

        CGPoint startPoint=[self.view convertPoint:point fromView:self.myTableView];
        [path moveToPoint:startPoint];
        //贝塞尔曲线中间点
        float sx=startPoint.x;
        float sy=startPoint.y;
        float ex=endpoint.x;
        float ey=endpoint.y;
        float x=sx+(ex-sx)/3;
        float y=sy+(ey-sy)*0.5-400;
        CGPoint centerPoint=CGPointMake(x,y);
        [path addQuadCurveToPoint:endpoint controlPoint:centerPoint];
       
        CAKeyframeAnimation *animation=[CAKeyframeAnimation animationWithKeyPath:@"position"];
        animation.path = path.CGPath;
        animation.removedOnCompletion = NO;
        animation.fillMode = kCAFillModeForwards;
        animation.duration=0.8;
        animation.delegate=self;
        animation.autoreverses= NO;
        animation.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
        [layer addAnimation:animation forKey:@"buy"];