-(void)willMoveToSuperview:(UIView *)newSuperview

{

    [self.scrollView addObserver:self forKeyPath:@"contentOffset" options:(NSKeyValueObservingOptionNew) context:Nil];

    self.scrollView.contentInset = UIEdgeInsetsMake(self.frame.size.height,  ,, );

    self.scrollView.scrollIndicatorInsets = self.scrollView.contentInset;

}

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context

{

    CGPoint newOffset = [change[@"new"] CGPointValue];

    [self updateSubViewsWithScrollOffset:newOffset];

}

-(void)updateSubViewsWithScrollOffset:(CGPoint)newOffset

{

    float destinaOffset = -;

    float startChangeOffset = -self.scrollView.contentInset.top;

    newOffset = CGPointMake(newOffset.x, newOffset.y<startChangeOffset?startChangeOffset:(newOffset.y>destinaOffset?destinaOffset:newOffset.y));

    float subviewOffset = self.frame.size.height-;

    float newY = -newOffset.y-self.scrollView.contentInset.top;

    float d = destinaOffset-startChangeOffset;

    float alpha = -(newOffset.y-startChangeOffset)/d;

    float imageReduce = -(newOffset.y-startChangeOffset)/(d*);

    self.subTitleLabel.alpha = alpha;

    self.titleLabel.alpha = alpha;

    self.frame = CGRectMake(, newY, self.frame.size.width, self.frame.size.height);

    self.backImageView.frame = CGRectMake(, -0.5*self.frame.size.height+(1.5*self.frame.size.height-)*(-alpha), self.backImageView.frame.size.width, self.backImageView.frame.size.height);

    CGAffineTransform t = CGAffineTransformMakeTranslation(,(subviewOffset-0.35*self.frame.size.height)*(-alpha));

    _headerImageView.transform = CGAffineTransformScale(t,

                                                        imageReduce, imageReduce);

    self.titleLabel.frame = CGRectMake(, 0.6*self.frame.size.height+(subviewOffset-0.45*self.frame.size.height)*(-alpha), self.frame.size.width, self.frame.size.height*0.2);

    self.subTitleLabel.frame = CGRectMake(, 0.75*self.frame.size.height+(subviewOffset-0.45*self.frame.size.height)*(-alpha), self.frame.size.width, self.frame.size.height*0.1);

}