UITableview header not shown again if scrolled up

Question

I have UITableview Controller, who has search bar in header. When i scrolled up the table view and it bounce. But the search bar hides. when i scroll down then the search bar shown. can any one tell me how can i show the search bar again?

I have tried the following code but it doesn't work smoothly:

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    CGFloat sectionHeaderHeight = 40;//Change as per your table header hight
    if (scrollView.contentOffset.y<=sectionHeaderHeight&&scrollView.contentOffset.y>=0) {
        //scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);
    } else if (scrollView.contentOffset.y>=sectionHeaderHeight) {
        CGPoint newOffset = CGPointMake(0, -[self.tableView  contentInset].top);
        [self.tableView setContentOffset:newOffset animated:YES];
    }
}

Here is screen shot for view before scrolling:

And this is wrong view, After scrolling:

Here is the code for section `-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section { if(section==0) { return 35.0; } else { return 25.0; } }` — Muhammad Umair, May 19 '16 at 10:04
what is that 40 hardcoded ? what happen if you make it to 200 — maddy, May 19 '16 at 10:06
Its header height it is working but i am changing this in viewdidscroll so that's why, it is not smooth — Muhammad Umair, May 19 '16 at 10:09
If i changed the value to 200 the if conditions will not work. — Muhammad Umair, May 19 '16 at 10:10
Maybe, this will help you http://stackoverflow.com/questions/4870085/locking-a-uisearchbar-to-the-top-of-a-uitableview-like-game-center — Flipper, May 19 '16 at 10:20
why have you keep commented that if logic in your cde ? is it not working or you forgot to uncomment — maddy, May 19 '16 at 10:30
@Alok its working for me but it is slow and jerky. i want a smooth bounce of tableview. — Muhammad Umair, May 19 '16 at 10:34
ok how about setting contentOffset to No , and use your custom animation ? — maddy, May 19 '16 at 10:38

maddy · Accepted Answer · 2016-05-19T11:08:15.257

1

How about disabling animation to off and put custom animation like this:

also make your sure to have same sectionHeader height using MAcro. i have still doubt in your one of comment saying 35 or 25.

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
            CGFloat sectionHeaderHeight = 40;//Change as per your table header hight
            if (scrollView.contentOffset.y<=sectionHeaderHeight&&scrollView.contentOffset.y>=0) {

    [UIView animateWithDuration: 1.0
                      animations: ^{
                          scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);
                      }completion: ^(BOOL finished){
                      }
        ];
            } else if (scrollView.contentOffset.y>=sectionHeaderHeight) {
                CGPoint newOffset = CGPointMake(0, -[self.tableView  contentInset].top);


[UIView animateWithDuration: 1.0
                  animations: ^{
                      [self.tableView setContentOffset:newOffset animated:NO];
                  }completion: ^(BOOL finished){
                  }
    ];
            }
}

edited May 19 '16 at 11:08

answered May 19 '16 at 11:00

maddy

4,001
8
42
65

It still hides behind the view – Muhammad Umair May 19 '16 at 11:08
I have commented that lines but still facing the same issue – Muhammad Umair May 19 '16 at 11:10
can you just try for a moment with 40.0f at every place for heightForHeaderInSection. – maddy May 19 '16 at 11:10
I figured out a way thanks for the help it help alot :) – Muhammad Umair May 19 '16 at 11:16
vote up the question please if you think it help someone else too. Thanks – Muhammad Umair May 19 '16 at 11:16

score 0 · Answer 2 · edited May 19 '16 at 11:27

try this code

- (void)scrollViewDidScroll:(UIScrollView *)scrollView  
{  
    CGFloat sectionHeaderHeight = 40;  
    if (scrollView.contentOffset.y<=sectionHeaderHeight&&scrollView.contentOffset.y>=0) {  
        scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);  
    }  
    else if (scrollView.contentOffset.y>=sectionHeaderHeight) {  
        scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0);  
    }  
}

but your problem is,your tableview header is not 40,it's 35 or 25,that means your tableview can't setup a correct number to the inset,try change 40 to correct header height.

Its not a section header. – Muhammad Umair May 19 '16 at 10:45 — Muhammad Umair, May 19 '16 at 10:45

UITableview header not shown again if scrolled up

2 Answers2