带有固定节头的 UITableView

你好, 我读到，UITableView的默认行为是在滚动节时将节标题行固定在表的顶部，直到下一节将前一节行推出视图。

I have a UITableView inside a UIViewController and this does not seem to be the case.

这只是 UITableViewController的默认行为吗？

这里有一些简化的代码。 我将展示为创建表视图而实现的 UIController接口和每个表视图方法。 我有一个帮助器数据源类，它可以帮助我索引对象，以便与表一起使用。

    @interface MyUIViewController ()<UITableViewDelegate, UITableViewDataSource>
@property (nonatomic, readonly) UITableView *myTableView;
@property (nonatomic, readonly) MyCustomHelperDataSource *helperDataSource;
@end


//when section data is set, get details for each section and reload table on success
- (void)setSectionData:(NSArray *)sections {
super.sectionData = sections; //this array drives the sections


//get additional data for section details
[[RestKitService sharedClient] getSectionDetailsForSection:someId
success:^(RKObjectRequestOperation *operation, RKMappingResult *details) {
NSLog(@"Got section details data");
_helperDataSource = [[MyCustomHelperDataSource alloc] initWithSections:sections andDetails:details.array];
[myTableView reloadData];
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
NSLog(@"Failed getting section details");
}];
}


#pragma mark <UITableViewDataSource, UITableViewDelegate>


- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
if (!_helperDataSource) return 0;
return [_helperDataSource countSectionsWithDetails]; //number of section that have details rows, ignore any empty sections
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
//get the section object for the current section int
SectionObject *section = [_helperDataSource sectionObjectForSection:section];
//return the number of details rows for the section object at this section
return [_helperDataSource countOfSectionDetails:section.sectionId];
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {


UITableViewCell * cell;


NSString *CellIdentifier = @"SectionDetailCell";


cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
cell.textLabel.font = [UIFont systemFontOfSize:12.0f];
}


//get the detail object for this section
SectionObject *section = [_helperDataSource sectionObjectForSection:indexPath.section];


NSArray* detailsForSection = [_helperDataSource detailsForSection:section.sectionId] ;
SectionDetail *sd = (SectionDetail*)[detailsForSection objectAtIndex:indexPath.row];


cell.textLabel.text = sd.displayText;
cell.detailTextLabel.text = sd.subText;
cell.detailTextLabel.textColor = [UIColor blueTextColor];


return cell;
}


- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
return 50.0f;
}


- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
return 30.0f;
}


- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger) section {
//get the section object for the current section
SectionObject *section = [_helperDataSource sectionObjectForSection:section];


NSString *title = @"%@ (%d)";


return [NSString stringWithFormat:title, section.name, [_helperDataSource countOfSectionDetails:section.sectionId]];
}


- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
UIView *header = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 260, 0)];
header.autoresizingMask = UIViewAutoresizingFlexibleWidth;


header.backgroundColor = [UIColor darkBackgroundColor];


SSLabel *label = [[SSLabel alloc] initWithFrame:CGRectMake(3, 3, 260, 24)];
label.font = [UIFont boldSystemFontOfSize:10.0f];
label.verticalTextAlignment = SSLabelVerticalTextAlignmentMiddle;
label.backgroundColor = [UIColor clearColor];
label.text = [self tableView:tableView titleForHeaderInSection:section];
label.textColor = [UIColor whiteColor];
label.shadowColor = [UIColor darkGrayColor];
label.shadowOffset = CGSizeMake(1.0, 1.0);
[header addSubview:label];


return header;
}