Resize of section header in UITableViewController not working properly - ios

Question

I am trying to resize a section header, according to a selection in the headers UISegmentedControl.
For some reason, it just doesn't want to work. I have tried with [self.tableView beginUpdates]; and [self.tableView endUpdates]; before, around and after the change-height code.. but it just act weird.
I get it to hide and show content, but it seems to allocate a different height for the view even thought the size of the header should be less.
This is what happens:
https://dl.dropboxusercontent.com/u/3077127/Problem3.mov
This is my code:
typedef enum {
kSearchTypeFrom = 0,
kSearchTypeTo
} kSearchType;
#interface MainVC ()
#property (nonatomic, strong) FilterVC *filterView;
#property (nonatomic, assign) kSearchType searchType;
#end
#implementation MainVC
#synthesize filterView = _filterView;
#synthesize searchType = _searchType;
[...]
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
self.searchType = kSearchTypeFrom;
[self.tableView beginUpdates];
[self.tableView endUpdates];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
}
// Configure the cell...
[cell.detailTextLabel setText:#"Test"];
return cell;
}
- (UIView*)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
if (!self.filterView) {
self.filterView = [[FilterVC alloc] init];
[self.filterView.view setBackgroundColor:self.navigationController.navigationBar.barTintColor];
}
[self.filterView.segment setSelectedSegmentIndex:self.searchType];
[self.filterView.segment addTarget:self action:#selector(didChangeSegmentSelection:) forControlEvents:UIControlEventValueChanged];
return self.filterView.view;
}
- (float)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
if (self.searchType == kSearchTypeFrom)
{
return 130;
}
else {
return 100;
}
}
#pragma mark - Height change table section
- (void)didChangeSegmentSelection:(UISegmentedControl*)segment
{
[self.tableView beginUpdates];
self.searchType = segment.selectedSegmentIndex;
NSLog(#"Selected: %d", segment.selectedSegmentIndex);
if (segment.selectedSegmentIndex == 0)
{
[self.filterView.changeToText setHidden:NO];
[self.filterView.changeToButton setHidden:NO];
[self.filterView.fromButton setUserInteractionEnabled:NO];
}
else {
[self.filterView.changeToText setHidden:YES];
[self.filterView.changeToButton setHidden:YES];
[self.filterView.fromButton setUserInteractionEnabled:YES];
}
[self.tableView endUpdates];
[self.filterView.view needsUpdateConstraints];
}
[...]
The FilterVC class is nothing more than an UIViewController containing the following:
#import "InsetTextField.h"
#interface FilterVC : UIViewController
#property (nonatomic, strong) IBOutlet InsetTextField *amountField;
#property (nonatomic, strong) IBOutlet UISegmentedControl *segment;
#property (nonatomic, strong) IBOutlet UIButton *fromButton;
#property (nonatomic, strong) IBOutlet UILabel *changeToText;
#property (nonatomic, strong) IBOutlet UIButton *changeToButton;
#end
What is it that I am doing wrong?

Answer 1

As an alternate to trying to animate, you could try reloading the table using the following:
- (void)didChangeSegmentSelection:(UISegmentedControl*)segment
{
//[self.tableView beginUpdates];
self.searchType = segment.selectedSegmentIndex;
NSLog(#"Selected: %d", segment.selectedSegmentIndex);
if (segment.selectedSegmentIndex == 0)
{
[self.filterView.changeToText setHidden:NO];
[self.filterView.changeToButton setHidden:NO];
[self.filterView.fromButton setUserInteractionEnabled:NO];
}
else {
[self.filterView.changeToText setHidden:YES];
[self.filterView.changeToButton setHidden:YES];
[self.filterView.fromButton setUserInteractionEnabled:YES];
}
//[self.tableView endUpdates];
[self.tableView reloadData];
[self.filterView.view needsUpdateConstraints];
}
EDIT:
How about a variable to track height? This is sloppy code, but if the concept works, you can refactor it:
// Declare a variable
#proprty (strong, nonatomic) float headerHeight;
// Use that variable for defining the height
- (float)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
if (self.searchType == kSearchTypeFrom)
{
headerHeight = 130;
}
else {
headerHeight = 100;
}
return headerHeight
}
Then change that variable:
- (void)didChangeSegmentSelection:(UISegmentedControl*)segment
{
[self.tableView beginUpdates];
self.searchType = segment.selectedSegmentIndex;
// Change the variable used for the header height
if (self.searchType == kSearchTypeFrom)
{
headerHeight = 130;
}
else {
headerHeight = 100;
}
NSLog(#"Selected: %d", segment.selectedSegmentIndex);
if (segment.selectedSegmentIndex == 0)
{
[self.filterView.changeToText setHidden:NO];
[self.filterView.changeToButton setHidden:NO];
[self.filterView.fromButton setUserInteractionEnabled:NO];
}
else {
[self.filterView.changeToText setHidden:YES];
[self.filterView.changeToButton setHidden:YES];
[self.filterView.fromButton setUserInteractionEnabled:YES];
}
[self.tableView endUpdates];
[self.filterView.view needsUpdateConstraints];
}