I have a UITableViewController created in storyboard. It has two sections. The first section's rows contain controls laid-out in storyboard. I want to update the rows in the second section using values in an array.
I'm fairly new to iOS development. I understand how to use a UITableViewDataSource to update a table based on the array, but not how to restrict the updates to a specific section. Can anyone outline how to do this?
EDIT This seemed like a simple problem, so I thought I code would just obscure the question. Maybe I was wrong. Heres what I have:
My numberOfRowsInSection function returns 1 in the section number is 0, because the first section (the one I designed in storyboard) has a single row, otherwise it returns the number of elements in the backing data array:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (section == 0)
return 1;
else
return [myData length];
}
My cellForRowAtIndexPath function creates a cell if the section number is 1. But I don't know what to do if the section number is zero. How do I avoid having to recreate the rows I laid-out in storyboard?
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if(indexPath.section == 1)
{
cell.textLabel.text = [myData objectAtindex:indexPath.row];
}
else
{
// What to do here?
}
}
Well If you only have few static controls in the first section why won't you put these controls in a table header view instead? Thus you'll only have one section to worry about :)
In your method - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPathadd this
Create 2 differents UITableViewCells and reference them like this
if (indexPath.section == 1) {
NSString *CellIdentifier = #"DynamicCell";
VideoCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
//You are drawing your second section so you can use your array as values
cell.property1...
cell.property2...
cell.property3...
return cell;
}else{//If you have only 2 sections then else represent your first section
//You are drawing your first section
NSString *CellIdentifier = #"StaticCell";
VideoCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
return cell;
}
You can change the row value in the delegate method
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
To identify the section, just use:
indexPath.section
You can use reloadRowsAtIndexPaths: with an array of all the indexPaths that are in the wanted section, built with a loop and a NSMutableArray.
- (void)reloadSections:(NSIndexSet *)sections
withRowAnimation:(UITableViewRowAnimation)animation;
The parameter "section" is An index set identifying the sections to reload.
Related
I have a populated array which I can display in the tableview, but I want to hide 3 of the cells text (out of 7 cells). I know the below code is wrong, but in this case I only want to show the text in cell 0.
cell.animal.text[0] = animalarray[0]
cell.animal.hidden = true
Because you don't have codes, I can only use words to describe how it should be done.
You need to have an array of the unwanted text that you do not want to show.
Inside your cellForRowAtIndexPath, you need to have a for loop, to go through the animalarray, and within the for loop, have an if-else statement to check whether if(unwantedtext == animalarray), then cell!.textLabel.text = " "
You need to show me codes for me to help you.
I'm gonna try to help you in Objective C, hopefully I can make the logic so clear the language difference doesn't matter.
Generally you are telling the TableView what to print for each cell in the below delegate method in your ViewController.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"cell"];
cell.textLable.text = animalArray[indexPath.row];
return cell;
}
This is where you will decided which index in the animalArray you do or do not want to print. If your requirement is a static the simplest is to hardcode the the blocking.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"cell"];
if(!(indexPath.row == self.indexIDontWantToPrint)) {
cell.textLable.text = animalArray[indexPath.row];
}
return cell;
}
If the indexes you do not want to print is dynamic and submitted to you by say an array.
You need to replace if(!(indexPath.row == self.indexIDontWantToPrint)) with checking if indexPath.row is inside the array of indexes you are to ignore.
NSArray has a handy containsObject method you can use to check if the array contains the current index the tableView wants to print. Be careful of the type difference of indexPath.row is NSInteger while NSArray needs to carry NSNumber for simple numeric numbers.
Adding more efficient logic than jo3birdtalk
1) Instead of having a extra array, you can creat an Object which contains a string & Bool.Add these objects in animalarray
2) Get the object from array at indexpath & check
if(animal.isShow == YES),if Yes show the text else hide label Or set blank string whatever you required
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"cell"];
Animal * animal = animalArray[indexPath.row];
if(animal.isShow == YES)
{
show the text
}else
{
hide label Or set blank string whatever you requered
}
return cell;
}
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 creating an app where users can store an object in Core Data. I have the Objects being pulled into a UITableView and everything is working correctly there. I now want to separate the objects into a possible of 1-3 different sections based on choices in a UISegmentedControl.
Currently I have this to create the 1 section and populate the cells of that section with my objects
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return self.fetchedDiscs.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"DiscCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
//Configure Cell
Disc *currentDisc = [self.fetchedDiscs objectAtIndex:indexPath.row];
cell.textLabel.text = currentDisc.name;
cell.detailTextLabel.text = currentDisc.brand;
return cell;
}
So the main question is how to dynamically change the number of sections and number of rows in section?
The Segmented control returns values such as Option 1, Option 2, Option 3. The only way I can think of is to loop through my fetchedDiscs array and separate that into an array for each section. Then I can return the number of arrays if they exists and I can get the count of each array to get the number of rows in each section. But then I get to the problem of How to get the CellForRowAtIndextPath to work correctly with three arrays.
Basically there has to be a better more logical way to do this. I am just not sure how.
Let, you have a dictionary named dataSource that contains 'x' number of array as value for key "key1", "key2", .. "keyX". You can do this:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [[dataSource allKeys] count];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
//Get the array object form key. I am considering 'keySection' as an example
return [[dataSource objectForKey:#"keySection"] count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"DiscCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
cell.textLabel.text = [[dataSource objectForKey:keySection] objectAtIndex:indexPath.row]
return cell;
}
Note: I wrote the code in this editor, excuse any mistakes, I just tried to share the idea. Hope this helps.. :)
in method
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
usually you use an array to set
[cell.textLabel setTex:#"row"];
but if I want to jump a row?
at example at indexpath.row I don't want to have this cell in my tableview, is possible?
Try this: Incorporate the tableView datasource method for row height.
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.row == NUMBER_TO_AVOID) {
return 0.0f;
}
return 44.0f; //standard cell height
}
I have done this in several similar situations. What you'll do is create a second array "activeItems". Or something like that. Iterate through your main data array and build the active array with the valid items. Than have your data source reference this array instead. This gives you an array that is accurately indexed to your table.
You can put a condition in cellForRowAtIndexPath. Try this:
data = [array objectAtIndex:indexPath.row];
If (data != nil){
[cell.textLabel setText:data];
}
else{
// code that handles data if null
}
My code is a little different to others, but it works.
I am new to app coding, but I would like to add some of
these into sections:
So some of them have their own group with a small title to each.
But my code looks like this:
and I don't know what to insert to do it right.
(The bottom half of that picture is the pictures in the detail view, that shows up in the detail view when you select something from the table view.)
(I know Xcode shows errors in my code, but it still works. )
Can anyone help me?
You have to implement some UITableView methods and delegate methods (and of course set your class as the delegate of the class) :
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
//Here you must return the number of sectiosn you want
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
//Here, for each section, you must return the number of rows it will contain
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
//For each section, you must return here it's label
if(section == 0) return #"header 1";
.....
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
// Set up the cell...
cell.text = // some to display in the cell represented by indexPath.section and indexPath.row;
return cell;
}
With that, you can arrange your data as you want : One array for each section, one big array with sub arrays, ... as you want. Antthing will be ok as far as you can return the wanted values from the methods above.