How to change height of grouped UITableView header?

I know how to change the height of the section headers in the table view. But I am unable to find any solution to change the default spacing before the first section.

Right now I have this code:

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
    if (section == 0){
        return 0;
    }
    return 10;
}

Return CGFLOAT_MIN instead of 0 for your desired section height.

> Returning 0 causes UITableView to use a default value. This is > undocumented behavior. If you return a very small number, you > effectively get a zero-height header.

Swift 3:

 func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        if section == 0 {
            return CGFloat.leastNormalMagnitude
        }
        return tableView.sectionHeaderHeight
    }

Swift:

func tableView(tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
    if section == 0 {
        return CGFloat.min
    }
    return tableView.sectionHeaderHeight
}

Obj-C:

    - (CGFloat) tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    if (section == 0)
        return CGFLOAT_MIN;
    return tableView.sectionHeaderHeight;
}

If you use tableView style grouped, tableView automatically set top and bottom insets. To avoid them and avoid internal insets setting, use delegate methods for header and footer. Never return 0.0 but CGFLOAT_MIN.

Objective-C

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
    // Removes extra padding in Grouped style
    return CGFLOAT_MIN;
}

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section {
    // Removes extra padding in Grouped style
    return CGFLOAT_MIN;
}

Swift

func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
    // Removes extra padding in Grouped style
    return CGFloat.leastNormalMagnitude
}

func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
    // Removes extra padding in Grouped style
    return CGFloat.leastNormalMagnitude
}

This worked for me with Swift 4. Modify your UITableView e.g. in viewDidLoad:

// Remove space between sections.
tableView.sectionHeaderHeight = 0
tableView.sectionFooterHeight = 0

// Remove space at top and bottom of tableView.
tableView.tableHeaderView = UIView(frame: CGRect(origin: .zero, size: CGSize(width: 0, height: CGFloat.leastNormalMagnitude)))
tableView.tableFooterView = UIView(frame: CGRect(origin: .zero, size: CGSize(width: 0, height: CGFloat.leastNormalMagnitude)))

It appears that I can't set a table header view with height of 0. I ended up doing the following:

- (void)viewWillAppear:(BOOL)animated{
    CGRect frame = self.tableView.tableHeaderView.frame;
    frame.size.height = 1;
    UIView *headerView = [[UIView alloc] initWithFrame:frame];
    [self.tableView setTableHeaderView:headerView];
}

You can try this:

In the loadView

_tableView.sectionHeaderHeight = 0;

Then

-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
    return 0;
}

It should be removed as long as you do not have any objects in the header...

And if you want some size of the sectionheader, then change only the return value.

same if you do not get the sectionfooter removed.

_tableView.sectionFooterHeight = 0;

and

-(CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section{
    return 0;
}

Well, this works for my problems with the tableview in the iOS7.

You should remove the code self.tableView.tableHeaderView = [UIView new]; after you add

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section{
    return CGFLOAT_MIN;
}

In Swift 4

Remove extra top padding in grouped tableview.

Here height is given 1 as minimal height for the section header because you cannot give 0 as tableview will take it default top margin if assigned zero height.

func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
    return 1
}

func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    return UIView()
}

you can use viewForHeaderInSection and return a view with any height.

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{

    int height = 30 //you can change the height 
    if(section==0)
    {
       UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, height)];
       
       return view;
    }
}

In swift 2.0

func tableView(tableView: UITableView, estimatedHeightForHeaderInSection section: Int) -> CGFloat {
        
        return yourHeight
    }

These two lines are enough.

tableView.sectionHeaderHeight = 0
tableView.sectionFooterHeight = 0
    

For me, it is working in Xcode 12.2, iOS 14.2

Example of viewForHeaderInSection:

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 118)];
view.backgroundColor = COLOR_DEFAULT;

NSString* key = [self.tableKeys objectAtIndex:section];
NSArray *result = (NSArray*)[self.filteredTableData objectForKey:key];
SZTicketsResult *ticketResult = [result objectAtIndex:0];

UIView *smallColoredView = [[UIView alloc] initWithFrame:CGRectMake(0, 5, 320, 3)];
smallColoredView.backgroundColor = COLOR_DEFAULT_KOSTKY;
[view addSubview:smallColoredView];

UIView *topBackgroundView = [[UIView alloc] initWithFrame:CGRectMake(0, 8, 320, 40)];
topBackgroundView.backgroundColor = [UIColor colorWithRed:255.0/255.0 green:248.0/255.0 blue:174.0/255.0 alpha:1];
[view addSubview:topBackgroundView];

UILabel *totalWinnings = [[UILabel alloc] initWithFrame:CGRectMake(10, 8, 300, 40)];
totalWinnings.text = ticketResult.message;
totalWinnings.minimumFontSize = 10.0f;
totalWinnings.numberOfLines = 0;
totalWinnings.backgroundColor = [UIColor clearColor];
totalWinnings.font = [UIFont boldSystemFontOfSize:15.0f];
[view addSubview:totalWinnings];

UIView *bottomBackgroundView = [[UIView alloc] initWithFrame:CGRectMake(0, 55, 320, 58)];
bottomBackgroundView.backgroundColor = [UIColor colorWithRed:255.0/255.0 green:248.0/255.0 blue:174.0/255.0 alpha:1];
[view addSubview:bottomBackgroundView];

UILabel *numberOfDraw = [[UILabel alloc] initWithFrame:CGRectMake(10, 55, 290, 58)];
numberOfDraw.text = [NSString stringWithFormat:@"sometext %@",[ticketResult.title lowercaseString]];;
numberOfDraw.minimumFontSize = 10.0f;
numberOfDraw.numberOfLines = 0;
numberOfDraw.backgroundColor = [UIColor clearColor];
numberOfDraw.font = [UIFont boldSystemFontOfSize:15.0f];
[view addSubview:numberOfDraw];

return view;