导航栏透明度改变

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{

    if (scrollView !=self.MyCollectionDetailsTable) {

        return;

    }

    

    UIColor *color=kUIColorFromRGBWithAlapha(232, 91, 85, 1);

    UIColor *color1=[UIColor whiteColor];

    CGFloat offset=scrollView.contentOffset.y;

    if (offset<0) {

         _RedFocusBtn.layer.borderColor=kUIColorFromRGBWithAlapha(147, 147, 147, 1).CGColor;

        [_RedFocusBtn setTitleColor:kUIColorFromRGBWithAlapha(147, 147, 147, 1) forState:UIControlStateNormal];

       [_BackBtn setImage:[UIImage imageNamed:@"heifanhui"] forState:UIControlStateNormal];

        self.RedView.backgroundColor = [color colorWithAlphaComponent:0];

        self.RedTitle.textColor= [color1 colorWithAlphaComponent:0];

    }else {

        CGFloat alpha=1-((65*kMainNewScreenScale-offset)/65*kMainNewScreenScale);

        self.RedView.backgroundColor=[color colorWithAlphaComponent:alpha];

        self.RedTitle.textColor=[color1 colorWithAlphaComponent:alpha];

        _RedFocusBtn.layer.borderColor=[UIColor whiteColor].CGColor;

        [_RedFocusBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

        [_BackBtn setImage:[UIImage imageNamed:@"denglufanhui"] forState:UIControlStateNormal];

    }

}