I have added tableview on top of UIViewController and I have also implemented the UITableViewDataSource and UITableViewDelegate methods
For some reason, I am not getting the value out of didSelectRowAtIndexPath. I get the expected value of indexPath.row but the selectedCell.textLabel.text returns nil.
I am not able to figure out what may be the problem. I am using the dynamic table.
//Array of multiple objects is filled through the delegated arrays and the arrays are properly filled.
#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 _arrayForMultipleObjects.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"cell" forIndexPath:indexPath];
array = [[NSMutableArray alloc]init];
// Configure the cell...
_singleSelectionLabel= (UILabel *) [cell viewWithTag:2];
_singleSelectionLabel.text=[self.arrayForMultipleObjects objectAtIndex:indexPath.row];
return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
NSString *valu ;
NSLog(#"%i count",indexPath.row);
UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];
NSString *cellText = selectedCell.textLabel.text;
NSLog(#"%#",cellText);
//Here cellText is null
if([tableView cellForRowAtIndexPath:indexPath].accessoryType==UITableViewCellAccessoryNone)
{ [tableView cellForRowAtIndexPath:indexPath].accessoryType=UITableViewCellAccessoryCheckmark;
valu = cellText;
}
NSLog(#"%#",valu);
}
If you are using storyboard then the default cell style of table cells is Custom which gives you a blank cell where you can add other types of controls to it.
If you dragged a label onto the cell and changed its text, then you are likely using a Custom style of UITableViewCell.
The property textLabel is only available on cells of types other than Custom, such as Basic, or Detailed.
Please double check if this is the case for you.
Edit: As ready suggested you can fetch the text like this:
self.arrayForMultipleObjects[indexPath.row]
Related
This is a little hard to explain, but I will try my best. The code below is just some simple code I put together to demonstrate my problem better. When a user selects the second cell (row) for example, the tableview properly changes the cell with this [cell selected:YES]; when tableview reloads. If the second cell is selected and my tableview reloads with more new cells, the wrong cell is selected. The previous selected second cell becomes the fourth or fifth cell when the tableview updates, but the second cell is still selected.
I know this is because of selectIndexPath index row is two. Is there a way around this?
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{
FriendCell *cell
if (selectedIndexPath.row == indexPath.row )
[cell selected:YES];
else
[cell selected:NO];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
selectIndexPath = indexPath;
}
If your source array can changed (add/remove elements) then you have to keep track of the selected item, not the selected index. You haven't shown what your data source object is, but let's say it was an array of strings:
#property (strong,nonatomic) NSMutableArray *tableData;
#property (strong,nonatomic) NSString *selectedItem;
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{
FriendCell *cell
if (self.selectedItem != nil && [self.tableData[indexPath.row] isEqualToString:self.selectedItem]) {
[cell selected:YES];
} else {
[cell selected:NO];
}
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
self.selectedItem = self.tableData[indexPath.row];
}
I'm attaching an image because this is kinda hard to explain, I've also mocked up what I actually want it to look like. I'm going to try to explain it to so that others might find the question.
Maybe you've run up against this before and know a fix?
Here is the image of what I have alongside a mockup of what I want:
On the left, what I have, the items in the table are not separated by separator lines but the empty lines cells are separated. Ideally, the empty cells would not be shown and the table would just end letting the background show and the items in the table would have separators between their cells.
This is the corresponding code:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
NSMutableArray *withoutThing = [NSMutableArray arrayWithArray:self.containerOfLists];
[withoutThing removeObjectAtIndex:indexPath.row];
self.containerOfLists = withoutThing;
[[NSUserDefaults standardUserDefaults] setObject:self.containerOfLists forKey:#"list of lists"];
[[NSUserDefaults standardUserDefaults] synchronize];
[self.tableView reloadData];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [self.containerOfLists count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"ListCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
cell.textLabel.text = self.containerOfLists[indexPath.row];
return cell;
}
Ok.
In the Storyboard, select your UITableView, set the Separator to Single Line, or by code with:
[yourTableView setSeparatorStyle:UITableViewCellSeparatorStyleSingleLine];
In your code, do somewhere:
[yourTableView setBackgroundColor:[UIColor lightGrayColor]];
Or the gray color you want.
Add this to your datasources methods (as the same level as tableView: cellForRowAtIndexPath):
-(UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section
{
return [[UIView alloc] init];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 5; //return correct number
}
in ViewDidLoad method call:
[self.tableView setSeparatorStyle:UITableViewCellSeparatorStyleSingleLine];
Init cell:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"ListCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if (!cell)
{
//init the cell!
}
cell.textLabel.text = self.containerOfLists[indexPath.row];
return cell;
}
I am trying to create simple messaging app just like the built one.
I want to reproduce the same effect speech bubbles as iMessage.
I found a project from apple called MultipeerGroupChat which has that functionality.
The problem is It has a lot more than what I need making it hard to replicate, because of class dependencies. I dont need multipeer or sending images.I stripped a lot of code out already.
I now have a simple TableView, I added the bubble images and 2 classes:
MessageView.h
Transcript.h
I narrowed down the issue to this table view delegate to display the bubbles:
// The individual cells depend on the type of Transcript at a given row. We have 3 row types (i.e. 3 custom cells) for text string messages, resource transfer progress, and completed image resources
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
// Get the transcript for this row
Transcript *transcript = [self.transcripts objectAtIndex:indexPath.row];
// Check if it's an image progress, completed image, or text message
UITableViewCell *cell;
if (nil != transcript.imageUrl) {
// It's a completed image
cell = [tableView dequeueReusableCellWithIdentifier:#"Image Cell" forIndexPath:indexPath];
// Get the image view
ImageView *imageView = (ImageView *)[cell viewWithTag:IMAGE_VIEW_TAG];
// Set up the image view for this transcript
imageView.transcript = transcript;
}
else if (nil != transcript.progress) {
// It's a resource transfer in progress
cell = [tableView dequeueReusableCellWithIdentifier:#"Progress Cell" forIndexPath:indexPath];
ProgressView *progressView = (ProgressView *)[cell viewWithTag:PROGRESS_VIEW_TAG];
// Set up the progress view for this transcript
progressView.transcript = transcript;
}
else {
// Get the associated cell type for messages
cell = [tableView dequeueReusableCellWithIdentifier:#"Message Cell" forIndexPath:indexPath];
// Get the message view
MessageView *messageView = (MessageView *)[cell viewWithTag:MESSAGE_VIEW_TAG];
// Set up the message view for this transcript
messageView.transcript = transcript;
}
return cell;
}
As mention before I only need the message so I stripped down to this:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell;
Transcript *transcript = [self.messageArray objectAtIndex :[indexPath row]];
cell = [tableView dequeueReusableCellWithIdentifier:#"Message Cell" forIndexPath:indexPath];
MessageView *messageView = (MessageView *)[cell viewWithTag:MESSAGE_VIEW_TAG];
messageView.transcript = transcript;
//how does the code add the view and return it ?? :-S
return cell;
}
This code does not display anything.
Now I dont understand how this code customize the cell to show speech bubbles.
Please advice.
- (id)dequeueReusableCellWithIdentifier:(NSString *)identifier forIndexPath:(NSIndexPath *)indexPath on UITableView will return an instance of UITableViewCell that is ready to be reused or if no reusable cells exist it will create one.
However, according to the documentation, you need to first register a nib or Class with the table view so it knows what cell maps to that reuse identifier.
Check out the methods:
- (void)registerNib:(UINib *)nib forCellReuseIdentifier:(NSString *)identifier
- (void)registerClass:(Class)aClass forHeaderFooterViewReuseIdentifier:(NSString *)identifier
You are missing:
[cell.contentView addSubview:messageView];
in:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
It should be:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell;
Transcript *transcript = [self.messageArray objectAtIndex :[indexPath row]];
cell = [tableView dequeueReusableCellWithIdentifier:#"Message Cell" forIndexPath:indexPath];
MessageView *messageView = (MessageView *)[cell viewWithTag:MESSAGE_VIEW_TAG];
messageView.transcript = transcript;
[cell.contentView addSubview:messageView];
return cell;
}
I'm working on my first app and I'm kind of new to Objective-C, I want to make it so when someone types in a text field then presses a button it will save it to a table view. Does anyone know how to do this or know any tutorials.
all you have to do is everytime you press the button you'll refresh/update your tableview.
- (IBAction)buttonPressed:(id)sender {
NSString *textNameToAdd = yourTextField.text;
[containerArrayForTableView addObject:textNameToAdd];
[myTableView reloadData];
}
// UITABLEVIEW DELEGATES
- (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.
// Usually the number of items in your array (the one that holds your list)
return [containerArrayForTableView count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
//Where we configure the cell in each row
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell;
cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Configure the cell... setting the text of our cell's label
cell.textLabel.text = [containerArrayForTableView objectAtIndex:indexPath.row];
return cell;
}
refer here if you are having trouble configuring with UITableView.
These are some good tutorials for you..
http://www.appcoda.com/ios-programming-tutorial-create-a-simple-table-view-app/
http://www.codigator.com/tutorials/ios-uitableview-tutorial-for-beginners-part-1/
http://iosmadesimple.blogspot.in/2012/10/adding-uitableview-tutorial.html
Happy coding.
EDIT:
Here what i made for you:
Simple Demo With TextField & TableView
EDIT 2:
Simple Demo With 2 TextFields & 2 TableViews
MY UITableview Group style only showing one value from the array of 4 elements.
in viewdidload i add following array
_displayThemeItems=[[NSArray alloc]initWithObjects:#"Default",#"Night",#"Sepia" ,#"Blue" ,nil];
_displayThemeIcons=[[NSArray alloc]initWithObjects:[UIImage imageNamed:#"day.png"],[UIImage imageNamed:#"night.png"],[UIImage imageNamed:#"sepia.png"], [UIImage imageNamed:#"blue.png"],nil];
and my table delegate methods
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [_displayThemeItems count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier=#"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
// No cell available - create one.
if(cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:CellIdentifier];}
NSLog(#"rray%#",_displayThemeItems);
cell.textLabel.text = [_displayThemeItems objectAtIndex:indexPath.row];
cell.imageView.image=[_displayThemeIcons objectAtIndex:indexPath.row];
return cell;
}
Your code look fine to me, the only the only reason that I can think amy effect the result you see is how you set up your table view.
Make sure that your table view frame is bug enough to show the 4 items, and make sure you set the tabe view data source.
Add the "}" just before the return such that the code where you set the title and image comes under the "if" statement.