I'm trying to insert a row after the user has pressed return on the keyboard.
The code inside the textFieldShouldReturn method looks like this:
NSIndexPath *lastIndexPath = [NSIndexPath indexPathForRow:([self.tableView numberOfRowsInSection:([self.tableView numberOfSections] - 1)] - 1)
inSection:([self.tableView numberOfSections] - 1)];
[self.tableView insertRowsAtIndexPaths:#[lastIndexPath]
withRowAnimation:UITableViewRowAnimationRight];
This works fine until 10 rows are shown, after which a row is inserted at the beginning and then one and the end of the tableView.
How can I fix this?
I am pretty sure you have not updated your data. And one o both methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
of UITableViewDataSource returns wrong data.
UITableView only displays data. You should store it yourself somewhere.
Related
I need to always show cell with segmentControll, how can i do it?
There are a couple of ways to do this. Here is what I would do.
1
Don't put the segmented control as part of the table. Simply move it outside the UITableView. With that being said, if you are using a TableView Controller, you have to switch to a ViewController and add TableView to it.
2
This is a way to create a header for your table. Maybe that's what you want.
Use this method if you want a title:
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
Or this one if you want a custom view:
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
And for the height:
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
I want to do min/max (expand/collapse) button functionality.Please see bellow image for more information.Is anybody know how to develop this functionality.I have some examples but those are not like exactly what i want.Please help me to solve this problem.
I've got a similar kinda requirement few days back. I have done this using custom tableview cell.
Firstly, you have to pass the indexpath of each row to the cell. For this i have taken a property in custom tableview cell.
i.e, #property(nonatomic,assign) NSIndexPath *indexPathOfCell;
Now, you have to pass the indexpath of row in datasource method.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
And you have to write a delegate method in custom tableviewcell so that when the user clicks on the min/max button you can reload that cell through this delegate call.
-(void)reloadCellWithIndexPath:(NSIndexPath*)indexPath;
You have to set the view controller as delegate for the custom tableview cell in which you are populating the table. In that class you have to maintain an NSMutableArray.
NSMutableArray *selectedIndexPaths;
When ever the reloadCellWithIndexPath gets called you can simply do same.
-(void)reloadCellWithIndexPath:(NSIndexPath*)indexPath{
if(![selectedIndexPaths containsObject:indexPath]){
[selectedIndexPaths addObject:indexPath];
}else
[selectedIndexPaths removeObject:indexPath];
[tableView reloadData];
}
In heightForRowAtIndexPath method you can change the height for a particular row.
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
BOOL cellModeChanged = NO;
for (NSIndexPath *indexpath in selectedIndexPaths) {
if(indexpath.section == indexPath.section && indexpath.row == indexPath.row)
cellModeChanged = YES;
}
if(cellModeChanged)
return 400.0;
else
return 100.0;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
if ([BGSearchParameter defaultSearchParameters].fetchedResults.count==0)
{
PO(#([self.tableView numberOfRowsInSection:0]));
PO(#([self tableView:nil numberOfRowsInSection:0]));
PO(#(indexPath.row));
while (false);
}
This is the result
self.tableView numberOfRowsInSection:0]): 20
#([self tableView:nil numberOfRowsInSection:0]): 0
Now, I do not know who call that cellForRowAtIndexPath.
Here is the screenshot
The debuggin windows shows that the main thread somehow call cellForRowAtIndexPath.
I usually fix this issue by returning some random UITableViewCell that's never displayed. Howerver, I think it's a bug.
What functions can call cellForRowAtIndexPath anyway besides tableReload and why it doesn't call
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
first?
It seems that my tableView still think there are 20 rows even though there are only 0 rows.
The issue seems to be your tableview is not refreshing. Please include this line in your code so that it will refersh each time:-
[yourTableView reloadData];
You can use the parameter "tableView" of this method to check whether the right instance of "UITableView" is called. For example, in the delegate method" - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section" add these code:
if(tableView== youwanttocheckTableView) {
//do what you want to do
}
You can also check which TableView instance have set its delegate equals "self" in this class.
I have to make a tableview with different cells in it. I have three preferences and the table depends on them. There may be 6 different tableviews - 1 cell, 1cell and 3cell, no cell, 2 cell and 3 cell and so on, this depends on preferences
That's the best way to do this?
Maybe someone knows good example, or tutorial on this
You could make just one UITableView with different sections.
Based on your section id you may be returning different cell in
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
indexPath contains row & section values.
Also you might return different number of rows in a section with:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
//pass value to numper of cells;
return 4 (or) 2;
}
//use this to add cell
[tableview reloadData];
A tableView in my UIViewController has as data source a NSMutableArray.
After I've added a new object to the mutable array, I invoke [tableView reloadData], which correctly invokes:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
returning the correct update amount of elements in the array. However the method:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
is not called afterwards. I thought when I reloadData of a table view such method was invoked.
The sections method:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)aTableView
always returns 1, in my code.
Thanks
What does the
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
method returns?
Have you managed it to return the count of your data source which is a NSMutableArray as you have mentioned?
In this method call :
[array count];
It was a thread issue... Ive fixed it with:
dispatch_async( dispatch_get_main_queue(), ^{
[table reloadData];
});