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分组动画

CAAnimationGroup *animationGroup = [CAAnimationGroup animation];

animationGroup.animations = @[[self rotation], [self dropAnimation]];

animationGroup.duration = 10;

//  beginTime  动画开始的时间
//  CACurrentMediaTime 获得当前的时间
//    从调用这个方法开始 5秒 之后 执行动画
animationGroup.beginTime = CACurrentMediaTime() + 5;
animationGroup.removedOnCompletion = NO;
animationGroup.fillMode = kCAFillModeBoth;

[layer addAnimation:animationGroup forKey:@"animationGroup"];

//选转动画
-(CABasicAnimation *)rotation{
CABasicAnimation *rotation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
rotation.toValue = @(M_PI_2*3);
rotation.removedOnCompletion = NO;

return rotation;
}

//掉落
-(CAKeyframeAnimation *)dropAnimation{
CAKeyframeAnimation *drop =[ CAKeyframeAnimation animationWithKeyPath:@"position"];
CGMutablePathRef ref = CGPathCreateMutable();
CGPathMoveToPoint(ref, NULL, layer.position.x, layer.position.y);
//    CGPathAddCurveToPoint cp1x y cpx y 设置两个点 在这两个点之间画曲线
//    x y 终止点
CGPoint endPoint = CGPointMake(50, 600);

CGPathAddCurveToPoint(ref, NULL, 160, 280, -30, 300, endPoint.x, endPoint.y);

//    设置掉落的路径
drop.path = ref;
CGPathRelease(ref);

return drop;
}