I'm trying to make a UITableView present a determined number of rows for a section, but even when I verify that its data source is returning x number of rows for numberOfRowsInSection, the table view shows x-1.
The exception to this unexpected behavior is if the numberOfRowsInSection is less than 3.
I've even put a breakpoint in cellForRowAtIndexPath and I confirmed it's being called for the row that is not appearing.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (section == SectionNumber_One) {
return 6;
} else {
return self.numberOfProjectRows; // This returns x, but x-1 rows are being shown
}
}
For example, if self.numberOfProjectRows is 5, only 4 rows are shown for the second section.
If I increase it manually to 6, it shows 5 rows but the data that should be in the 5th position, isn't there.
It doesn't seem to be related to screen size as I tested it on an iPad with same results.
Why is this happening? Is there some other possible modifier of the number of rows in a section?
I'm attaching an screenshot if it's of any help.
EDIT - Here are my delegate methods:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
// Cell with reuse identifier setup
if (section == SectionNumber_One) {
// cell setup for section one that's showing up ok
} else if (section == SectionNumber_Two) {
UITextField *projectField = cell.projectTextField;
if ([self.userProjectKeys count] > row) {
projectField.text = self.availableProjects[self.userProjectKeys[row]];
}
}
return cell;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
// Hide the password row for existing users
if (indexPath.row == FieldTag_Password && ![self.user.key vol_isStringEmpty]) {
return 0.0f;
} else {
return UITableViewAutomaticDimension;
}
}
The problem is probably not in your Datasource methods, but your Delegate methods, tableView(_:heightForRowAt:).
If you do not return a correct height for the cell, it won't show up.
It doesn't matter if you write 1000 cells in your datasource. If you don't return the height, they wont show up.
You are not comforming to the MVC pattern in implementing the table. You must return the count of the tableView's datasource, not variables of it.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (section == SectionNumber_One) {
return 6;
} else {
return [_displayingArray count]; // <-- here
}
}
If you want different items for each sections, then declare different datasource (ie array) for each of them.
EDIT: Even returning constant 6 is dangerous in the other section - you ought to add items to another fixed array and return that array's count in this delegate.
Related
i have UITableView header custom like Instagram where my section acts header, in this tableview i also using paging to get the data from server.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
if (currentPage == 0) {
return 1;
}
if (currentPage < totalPages) {
return myObject.count+1;
}
return myObject.count;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return 1;
}
-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection (NSInteger)section
{
myTimeline = [myObject objectAtIndex:section];
//the rest of my code to display text in UILabel cell, etc
}
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
if (cell.tag == kLoadingCellTag) {
currentPage++;
[self getTimeline];
}
}
Now the problem is, I already make sure that my paging is working and myObject array count is increase.
But when i do the scroll it crash in method viewForHeaderInSection with reason "index 10 beyond bounds [0 .. 9]'" (i set the paging in in server with 10 items per page)
I think the section in ViewForHeaderInSection not updating with numberOfSectionsInTableView method that i already setup.
So how to make the section in ViewForHeaderInSection updated?
Thanks..
Your numberOfSectionsInTableview has return myObject.count+1;, so the table view is dutifully asking for the header for the last section, which is beyond the bounds of your myObject array. You need either to remove the +1 or, if it's there for a reason, to include code in viewForHeaderInSection to handle that special case:
if (currentPage > 0 && currentPage < totalPages && section == myObject.count) {
// create whatever header view is appropriate for the final section
} else {
myTimeline = ... etc
}
I have a tableViewController, and under that i want one static cell and rest of all will be dynamic cells . I have already run for dynamic cells , but within same tableViewController i also need to add one static cell, how can i achieve it?
Please Help
Thanks in advance.
you could do something like the following:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return self.dynamicContent.count + 1; // +1 for the static cell at the beginning
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.row == 0) {
// static cell
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"StaticCellIdentifier" forIndexPath:indexPath];
// customization
return cell;
}
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"DynamicCellIdentifier" forIndexPath:indexPath];
id contentObject = self.dynamicContent[indexPath.row];
// customization
return cell;
}
You cannot create static and dynamic cell at same time in a UITableViewController.
But you can hard code your static cell's data and load the data each time you reload your tableview.
You can keep all your cells in one section and keep checking for index path.row == 0 or create separate sections for them.
typedef NS_ENUM(NSUInteger, TableViewSectionType) {
TableViewSectionType_Static,
TableViewSectionType_Dynamic
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 2; // One for static cell, and another for dynamic cells
}
- (NSInteger)tableView:(UITableView *)tableView
numberOfRowsInSection:(NSInteger)section
{
switch(section) {
case TableViewSectionType_Static:
return 1; // Always return '1' to show the static cell at all times.
case TableViewSectionType_Dynamic:
return [myDynamicData count];
}
}
With this approach your cells will be split into two sections and it will be easier to manage. And it will always show one cell, as number of rows returned for TableViewSectionType_Static is 1 always. It will show the dynamic cells based on your data count.
I am working on an app where I need to reorder rows of section 1. I could achieve the reorder by implementing the tableView delegates. When the table is in editing mode I show reorder for section 1 and no controls for rest sections, but the rows of rest section should be deleted by swipe to left.
I am not sure whether this is possible but my requirement is exact the same.
Work done by me:
Below are the delegates of tableView I implemented:
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {
if ([self.myTable isEditing]) {
return UITableViewCellAccessoryNone;
}
return UITableViewCellEditingStyleDelete;
}
-(BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == 1) {
return YES;
}
return NO;
}
-(BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}
The above code made the edit mode look as I wanted. Re-order sign got visible for only section 1 & red delete button is also not visible for rest sections (as desired).
Problem:
The rows of sections apart from section 1 were also not being deleted.When I swipe to left nothing happens.
In short in edit mode, section 1 should be re-order enabled and rest sections should work as they work in normal mode i.e swipe left to delete row should be functioning in tableview edit mode.
AFAIK you cannot achieve what you are trying. The two sections are part of the same table which is being edited. So once the table is in editing mode, it will affect all the sections and rows.
what you can do is divide the data in the two sections into two separate tables and load the tables in the header view of each section like this
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 2;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 0;
}
-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
if (section == 0) {
TableViewController1 *tab1 = [[TableViewController1 alloc] initWithStyle:UITableViewStylePlain];
return tab1.tableView;
} else{
TableViewController2 *tab2 = [[TableViewController2 alloc] initWithStyle:UITableViewStylePlain];
return tab2.tableView;
}
}
-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
return self.parentTable.frame.size.height/2;
}
tab1 will have data from first section and similar case for tab2 (forgive the variable naming). The parent table should have grouped style and also scrolling should be disabled for it. This way the two sections can be edited independent of each other. Also, this categorises data and each section becomes independently scrollable. Hope this helps and answers what ur looking for.
I have two tableviews and cells are configured depending on which table view it is, they are implemented in the cellForRowAtIndexPath method via indexpath.section. However, the two tableviews have a different number of sections. Is there a way to go about this issue? Thanks
When i said they had different section numbers i meant the following:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
if(tableView==byTeam) {
return [teamnameswithoutRepeat count];
} else {
return [JSONPointsArray count];
}
// Return the number of sections.
}
When i use the following in cellforrowatindexpath:
label.text=[currentarray objectAtIndex: indexpath.section];
there is a range error because indexpath.section is too big, it is using the JSONPointsArray to determine the number of sections, however when i run the app the by team tableview has the correct amount of sections.
Your cellForRow... method needs to be similar:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if (tableView == byTeam) {
// process the "byTeam" table using the teamnamesiwthoutRepeat array
} else {
// process the other table using the JSONPointsArray array
}
}
I have two UITableView which appears according to UISegmentControl.selectedSegmentIndex. The first table is grouped style and the second is plain.
NSFetchedResultsController is for the first UITableView, and NSMutableArray for the second.
In my numberOfSectionsInTableView:
return [_fetchedResultsController.sections count];
In this case the second UITableView's data displays for 3 times (because FirstTableView section count = 3).
I would like for the second tableView numberOfSectionsInTableView
return 1;
You should check which tableview you are displaying before returning the count. You can use the tableView input param for this.
For eg:-
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
if (tableView == self.firstTableView) //or (tableView == firstTableView)
return [_fetchedResultsController.sections count];
else
return 1;
}
You can use the following condition...
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
if(tableView == firstTableView)
return 1;
else if (tableView == secondTableView)
return 2;
//... and so on you can do like this....
}
All the best !!!
I guess you are setting the same data source for both table views. If that is the case, then in your:
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
if(tableView == firstTableView){ //assuming you have a reference to the first table view
return [_fetchedResultsController.sections count];
}else{
return 1;
}
}
You will have to do this in all your datasource methods. Instead it would be easier to make the datasource of the tableviews different.
To do this you can drag an object (the blue cube ) from the object library and set its class as say, SecondTableDatasource. And then set this object as the datasource for your second table, and implement the corresponding datasource methods in that class.
You can add tag for each tableView and check for each tag in numberOfSectionsInTableView