I\'m willing to change a specific header view of my UITableView when I click a row.
I\'ve read all posts about it yet. I tried \"reloadData\", \"setNeed
You just change it directly. I created an instance variable in the header file for a label that I will put in the header's view I'll create:
@interface MainViewController : UITableViewController {
// creating my datasource array instance variable
NSArray *_items;
// this is the label I will add to the header view when I create it
UILabel *_headerLabel;
}
@end
And in my tableView when they select a row I call a function that simply changes the text on the label:
@implementation MainViewController
- (id)init {
self = [super initWithStyle:UITableViewStyleGrouped];
/ filling my datasource with test strings
_items = @[@"one", @"two"];
return self;
}
- (void)changeHeaderLabel:(NSString *)newLabel {
// when this function gets called and is passed a string, I will simply
// set the text on the label to the new string and viola!
_headerLabel.text = newLabel;
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// this table will only have a single section for demo purposes
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// return the count of my datasource array
return _items.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
// attempt to create a cell by reusing one with a given identifier
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
// if I wasn't able to reuse one
if (cell == nil) {
// create one from scratch with that identifier
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
}
// now simply set the text on the cell from my data source array of strings
cell.textLabel.text = _items[indexPath.row];
// and return the cell
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// deselect the row so the cell automatically fades out after selection
[tableView deselectRowAtIndexPath:indexPath animated:YES];
// here you could do one of two things, either get a reference to the cell itself,
// and then get the value stored in it's textLabel
UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];
NSString *newHeaderTitleString = selectedCell.textLabel.text;
// OR you can get it right from your datasource
NSString *newHeaderTitleString = _items[indexPath.row];
// then just call the above function with the string as the single param
[self changeHeaderLabel:newHeaderTitleString];
}
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
// here I just create a view that will span the whole frame and is an arbitrary height
UIView *headerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 80)];
// set the background color to clear
headerView.backgroundColor = [UIColor clearColor];
// then I initialize my instance variable with a frame that's centered in the view
// for aesthetic purposes
_headerLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, self.view.frame.size.width - 10, 80)];
// then I set the text color, add an autoresizing mask so if the view rotates
// it still remains centered properly, set the text to some starting value,
// and add it to the headerView I previously created
_headerLabel.textColor = [UIColor darkGrayColor];
_headerLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth;
_headerLabel.text = @"Before";
[headerView addSubview:_headerLabel];
// then I return the headerView
return headerView;
}
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
// return an arbitrary height here for testing
return 80;
}
That results in the following:
If you have any questions let me know! This is just a quick example to demonstrate it, but you may want to customize the view in a different way altogether. This should at least solve your problem and give you a starting point to work from.