学步园

/**
 *  brief 弹跳动画
 *
 *  @param view     执行弹跳动画的view
 *  @param height   弹跳的高度
 *  @param duration 弹跳的时间
 */
- (void)bounceWithView:(UIView *)view height:(CGFloat)height duration:(CFTimeInterval)duration;
{
    CGPoint center = CGPointMake(view.frame.origin.x + view.frame.size.width * 0.5f, view.frame.origin.y + view.frame.size.height*0.5f);
    /*创建一个关键帧动画对象,key值为layer的position属性*/
    CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    /*创建一个可变数组,用于存储每帧执行后position的位置*/
    NSMutableArray *valuesArray = [[NSMutableArray alloc] init];
    /*第一帧的位置*/
    [valuesArray addObject:[NSValue valueWithCGPoint:center]];
    [valuesArray addObject:[NSValue valueWithCGPoint:CGPointMake(center.x, center.y+height)]];
    [valuesArray addObject:[NSValue valueWithCGPoint:center]];
    
    /*创建一个数组,用于存储每一帧的时间点*/
    NSArray *timesArray = @[@(0), @(0.4),@(1)];
    
    /*再创建一个数组,用于保存每一帧的动画曲线*/
    NSArray *timingFunctions = @[[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn],
                                 [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut],
                                 [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]];
    /*设置关键帧的值*/
    animation.values = valuesArray;
    /*设置关键帧时间点的值*/
    animation.keyTimes = timesArray;
    /*设置动画曲线*/
    animation.timingFunctions = timingFunctions;
    /*设置动画时间*/
    animation.duration = duration;
    /*设置代理*/
    animation.delegate = self;
    /*设置动画完成后是否自动移除,默认是YES,此处改为NO,否则在animationDidStop里就找不到这个动画了*/
    animation.removedOnCompletion = NO;
    /*重复执行*/
    animation.repeatCount = HUGE_VAL;
    /*将动画添加近_menuView.layer中*/
    [view.layer addAnimation:animation forKey:@"menuAnimation"];
}