I have a table and I want to show there some text; but I can't, I don't know why. My app is a view-based app, and I don't want to change it for a Table View Controller. Here's the code:
.h
{
NSArray *array;
IBOutlet UITableView *table;
}
.m
- (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 [array count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
cell.textLabel.text = [array objectAtIndex:indexPath.row];
// Configure the cell
return cell;
}
Please help me because I'm trying to solve this and I don't know what's wrong, why the Table doesn't show the array!
Thank you!
You almost certainly haven't connected your datasource and delegates properly in IB.
Your UIViewController needs to implement UITableViewDelegate and UITableViewDatasource, and you need to then connect it to your UITableView (table) as such in Interface Builder.
For details, read through Apple's documentation here.
On your .H file are you using this interfaces <UITableViewDelegate, UITableViewDataSource>?
The answer is that you've never ever created single cell. The call you make dequeueReusableCellWithIndentifier only recycles cells you've already created. Add this code after the dequeueResusable... line:
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
Related
So I have a tableView that has sections and rows, and it uses a custom cell class. The custom cell has an image view and a few labels. The table view works fine, and the search works, except the search does not display any of the labels that are in my custom cell class, only the imageView with the correct image. I am quite confused as to why this is, especially since the image is still displayed, but not the labels. Here is some code.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
//TODO: problem with search view controller not displaying labels for the cell, needs fixing
JSBookCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if(cell == nil) {
cell = [[JSBookCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
JSBook *book = nil;
//uses the appropriate array to pull the data from if a search has been performed
if(tableView == self.searchDisplayController.searchResultsTableView) {
book = self.filteredTableData[(NSUInteger)indexPath.section][(NSUInteger)indexPath.row];
}
else {
book = self.books[(NSUInteger)indexPath.section][(NSUInteger)indexPath.row];
}
FFMetaData *data = [self.ff metaDataForObj:book];
cell.titleLabel.text = book.title;
cell.priceLabel.text = [NSString stringWithFormat:#"$%#", book.price];
cell.authorLabel.text = book.author;
cell.descriptionLabel.text = book.description;
cell.dateLabel.text = [self.formatter stringFromDate:data.createdAt];
if(book.thumbnail == nil) {
cell.imageView.image = [UIImage imageNamed:#"messages.png"];
[self setCellImage:cell withBook:book atIndex:indexPath withTableView:tableView];
}
else {
cell.imageView.image = [UIImage imageWithData:book.thumbnail];
}
return cell;
}
Before this problem, I had only one section in the tableView, and everything worked perfectly. Now that I have multiple sections and rows the search is broken as I described. Any ideas? Also, for [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath]; I used to have [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath]; But now if I use that I get a weird exception when I try to search:
NSInternalInconsistencyException', reason: 'request for rect at invalid index path ( 2 indexes [1, 1])'
So that is confusing me also. Thanks for the help!
[self.tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
did not work because table view cells are registered to a specific table view. This will not work for your search results controller table view. You did find this out yourself and switched to:
[tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
which is the right thing to do.
Also, designing your custom cell in storyboard will not really work for your search results controller because you are not able to design cells for search table view, only for the main table view.
Yes, you can register that class for your search table view, as you did here,
[self.searchDisplayController.searchResultsTableView registerClass:[JSBookCell class] forCellReuseIdentifier:CellIdentifier];
but that will not have any of the stuff you designed in your custom cell in storyboard. You would have to create all programmatically.
I got the same exception when I tried to search and some how this fixes it.
if (tableView == self.searchDisplayController.searchResultsTableView) {
cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
}else{
cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
}
My summary for UITableView with Search Bar and Search Display using same custom cell designed in storyboard protype:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"CellIdentifierAsYouDefinedInStoryboard";
CustomTableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[CustomTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
if (tableView == self.searchDisplayController.searchResultsTableView) {
/* searchResultsTableView code here */
} else {
/* Base tableView table code here */
}
/* more cell code here */
return cell;
}
and then add this line for searchResultsTableView to match your custom cell height:
- (void)viewDidLoad
{
[super viewDidLoad];
[self.searchDisplayController.searchResultsTableView setRowHeight:self.tableView.rowHeight];
/* more of your viewDidLoad code */
}
If you are using a UITableView in a UIViewController and you want to reuse a Cell Identifier you created in your StoryBoard for your searchDisplayController, try this:
StoryBoard > UIViewController > Reference Outlets > link tableView to your UIViewController's .h file and call it something like tableView so you should have something like this:
#property (strong, nonatomic) IBOutlet UITableView *tableView;
So rather than doing it like this:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath]
}
do this
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
[self.tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath]
}
If you create a cell in the storyboard you should not register the class (this actually screws things up). You register the class if you make the cell in code , and you register a nib if you make the cell in the nib. If you make it in the storyboard, you don't register anything, you use dequeueReusableCellWithIdentifier:forIndexPath:, and you don't need the if (cell == nil) clause at all.
Try with this, it's work for me
JSBookCell * cell = [yourtableview dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
I'm new to iOS dev, so I do apologise for asking potentially dumb question.
What I want to do is something very similar to the default Weather app; where the app has a info button, it flips to another view which has a table along with a Done button to go back to the app.
I'm using the 'Utility Application' template which does most of this for me :)
However, I am now struggling to add a tableview into the flipview. Am I on the right path? I'm using storyboard at the moment - beginning to realise this is most likely a limitation on the GUI (after all a GUI can only go so far). If so, is this possible programatically and how would I go about applying it on a default 'Utility Application' template.
I'm using Xcode 4.2.
Any help would be appreciated. Thanks in advance :)
First of all, you'll want to drag and drop a UITableView onto your flipsideViewController in interface builder. Make sure that you like its delegate and data source to the view controller.
Then change flipsideViewController.h to create an instance variable for the array that will store the text for the cells labels and for the controller to conform to the tables delegate and data source methods.
#interface FlipsideViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>
{
NSArray *myArrayOfItems;
}
In flipsideViewController.m alloc/init and populate your array in viewDidLoad
myArrayOfItems = [[NSArray alloc] initWithObjects:#"firstItem",#"secondItem",#"thirdItem",#"fourthItem", nil];
And finally, copy and paste the following and you should have a working table!
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [myArrayOfItems count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.textLabel.text = [myArrayOfItems objectAtIndex:indexPath.row];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(#"Selected cell index:%i",indexPath.row);
}
I'm stuck with a seemingly very simple app that I'm trying to develop
Basically, I have a UITable, and two buttons: red/blue
When a button is pressed, a row with corresponding title of that button is append to the table
I'm overwhelmed by how complicated UITableView has to be implemented (datasource, delegate, resuable identifier, etc)
Can anyone help me out with this, preferably show me detailed codes
For my Buttons, I have something like this
- (IBAction)buttonPressed:(UIButton *)sender{
NSString *item = sender.currentTitle;
[self.cellArray addObject:item];
[self.myTable reloadData];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.cellArray.count;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"The Table Cell";
self.myTableCell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (self.myTableCell == nil) {
self.myTableCell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
self.myTableCell.textLabel.text = [self.cellArray objectAtIndex:indexPath.row];
return self.myTableCell;
}
Since you are learning this..i will post a simple solution.
Make add a member variable NSMutableArray *cellArrays;
initialize it in your viewDidLoad
in buttonPressed check;
if([#"red" isEqualToString:[YourButton titleForState:UIControlStateNormal]])
{
[self.cellArrays addObject:#"red"];
}
else
{
[self.cellArrays addObject:#"blue"];
}
[self.YOURTABLEVIEW reloadData];
Now in your table view datasource method
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.cellArrays.count;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//in between your code;
YOURCELL.textlabel.text = [self.cellArrays objectAtIndex : indexpath.row];
}
Try this ..
I'd recommend subclassing UITableViewController, then override the dataSource and delegate methods and you should be good to go. Going straight to UITableView is more complicated without any obvious benefits.
You may not be using Core Data, but I still recommend this lecture because it hooks up a TableViewController and works great - all code included. Check it out:
http://www.stanford.edu/class/cs193p/cgi-bin/drupal/node/289
The lectures in iTunes U explain everything further.
Enjoy,
Damien
I wanted to add that "One more thing, the compiler shows a warning says no reusable identifier. what exactly is that?" above...
His answer is correct, but to get rid of that compiler warning...
The tableviewcell of your tableview has to have an identifier. In IOS 5, in your storyboard, highlight the TableViewCell in your TableView, and enter a value in the Identifier. This must match the value in your code of the cell that you are creating.
I've been trying to fill a UITableView with data from a NSMutableArray. I have a View-Based application project and so far I've tried every tutorial I found but so far, it just doesn't work. I linked the dataSource and delegate to the File's Owner, I added the procotols UITableViewDelegate and UITableViewDataSource to my UIViewController, I create an array containing 3 strings just to try and debug, everytime I load the app, the table stays empty.
I'm not sure what could be my error, or where I should look to find the problem, if you guys got any idea that would be nice.
Thank you
-(NSInteger) tableView:(UITableView *)table numberOfRowsInSection: (NSInteger)section
{
return [yourArray count];
}
-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"CellIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
NSUInteger row = [indexPath row];
cell.textLabel.text = [yourArray objectAtIndex:row];
return cell;
}
That should populate the table from an array. I've used it several times in my app.
I guess you did forget to call -reloadData on the table view.
Make sure the dataSource and delegate are properly connected to the view controller, also make sure your UITableView is property connected with the outlet if you are using storyboards or a xib file.
If nothing works I recommend you to use XLData that makes UITableView data loading much more simple to implement.
How can i add objects into UITableView?
You have to first take IBOutlet Object of UITableView in interface file and then bind it using interface builder. Set delegate and data source of UITableView in the interface builder property.
And do the following coding in your project.
In .h file:
#interface RootViewController : UITableViewController<UITableViewDelegate,UITableViewDataSource> {
IBOutlet UITableView *tblView;
}
In .m file:
// Customize the number of sections in the table view.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return n;// n for number of row.
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell.
return cell;
}
Implement the UITableViewDataSource delegate methods.
Also check out the Table View Programming Guide.
Tableviews are populated by datasources, datasources are often an array of objects.
I suggest you look through some tutorials on tableviews and also delegate methods.
http://icodeblog.com/2008/08/08/iphone-programming-tutorial-populating-uitableview-with-an-nsarray/
icodeblog is a fantastic website for beginners.