下划线随着scrollview滑动

lineViewScroll.m

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    if (scrollView.tag == 318) {
        self.currentPage = (NSInteger)((scrollView.contentOffset.x + FUll_VIEW_WIDTH / 2) / FUll_VIEW_WIDTH);
    }
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    if (scrollView.tag == 318) {
        NSInteger yourPage = (NSInteger)((scrollView.contentOffset.x + FUll_VIEW_WIDTH / 2) / FUll_VIEW_WIDTH);
        CGFloat additionCount = 0;
        CGFloat yourCount = 1.0 / arrayCount;
        if (arrayCount > 5) {
            additionCount = (arrayCount - 5.0) / 5.0;
            yourCount = 1.0 / 5.0;
            __lineBottom.frame = CGRectMake(scrollView.contentOffset.x / 5, PageBtn - 2, yourCount * FUll_VIEW_WIDTH, 1);__
        }else {
            lineBottom.frame = CGRectMake(scrollView.contentOffset.x / arrayCount, PageBtn - 2, yourCount * FUll_VIEW_WIDTH, 1);
        }
        for (NSInteger i = 0;  i < btnArray.count; i++) {
            if (unselectBtn) {
                [btnArray[i] setTitleColor:unselectBtn forState:UIControlStateNormal];
            }else {
                [btnArray[i] setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
            }
            UIButton *changeButton = btnArray[i];
            [UIView animateWithDuration:0.3 animations:^{
                changeButton.transform = CGAffineTransformMakeScale(1, 1);
            }];
        }
        if (selectBtn) {
            [btnArray[yourPage] setTitleColor:selectBtn forState:UIControlStateNormal];
        }else {
            [btnArray[yourPage] setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        }
        UIButton *changeButton = btnArray[yourPage];
        [UIView animateWithDuration:0.3 animations:^{
            changeButton.transform = CGAffineTransformMakeScale(1.15, 1.15);
        }];
    }
}