I have a UITableView with custom UITableViewCells.
The table has two sections, the first section has a single row with a UITextField and can only be edited in terms of the text. This section & row cannot be edited from a UITableView perspective
The second section is a list of cells that are generated from an NSArray. These cells are once again custom UITableViewCells comprising of two UITextFields. These cells can be edited from a UITableView perspective, in the sense that the user can delete and insert rows.
In my designated initializer I have specified self.tableView.editing = YES, also I have implemented the method canEditRowAtIndexPath to return YES.
Problem Statement
The table view does not enter editing mode. I do not see the delete buttons or insert buttons against the rows of section 2. What am I missing?
just a suggestion, check whether your controller fit to these requirements :
i use usual UIViewController and it works fine - you need to :
make your controller a delegate of UITableViewDelegate, UITableViewDataSource
implement - (void)setEditing:(BOOL)editing animated:(BOOL)animated
programmatically add EDIT button - self.navigationItem.rightBarButtonItem = self.editButtonItem (if you add EDIT button from builder you will need to call setEditing : YES manually)
Piece of code :)
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
return UITableViewCellEditingStyleDelete;
}
- (void)setEditing:(BOOL)editing animated:(BOOL)animated
{
[super setEditing:editing animated:animated];
[self.tableView setEditing:editing animated:YES];
}
- (void)tableView
:(UITableView *)tableView didSelectRowAtIndexPath
:(NSIndexPath *)indexPath
{
[self.tableView deselectRowAtIndexPath:indexPath animated:NO];
[self.navigationController popViewControllerAnimated:YES];
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
// do not forget interface in header file
#interface ContactsController : ViewController<
UITableViewDelegate,
UITableViewDataSource>
Profit!
What if you do [self tableView setEditing:YES animated:YES]; instead of self.tableView.editing = YES;?
Related
I made my tableView as a subview of UIViewController , and in storyboard , i add prototype cells to this scene . but it seems that the design of cells in storyboard is not working , seems prototype cells works only for UITableViewController?
here is my storyboard design which i use a tableView as ViewController's subview , and add two prototype cells in it (pink and blue cell)
and here are my tableView codes:
#implementation SubViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
[self.tableView registerClass:[TableViewCell class] forCellReuseIdentifier:#"TableViewCell"];
[self.tableView registerClass:[ATableViewCell class] forCellReuseIdentifier:#"ATableViewCell"];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 2;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.row == 0)
{
TableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:#"TableViewCell" forIndexPath:indexPath];
return cell;
}
else
{
ATableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:#"ATableViewCell" forIndexPath:indexPath];
return cell;
}
}
and when i run my code ,i expect there will be a blue and pink cell , but in fact , the tableView will only got two blank cell (seems the design in storyboard not working)
If you are designing with the Storyboard,You dont need the below lines
[self.tableView registerClass:[TableViewCell class] forCellReuseIdentifier:#"TableViewCell"];
[self.tableView registerClass:[ATableViewCell class] forCellReuseIdentifier:#"ATableViewCell"];
Instead of that you need to set identifier for cell in the storyboard as in the below image
You want to check a few things to make sure your table view is wired up and knows to look for the cells in the SubViewController class.
Make sure the UITableView has its outlet set to something you can reference in code. self.tableView isn’t automatically connected unless you are using a UITableViewController subclass.
Make sure your table view has the SubViewController class connected as it’s data source and delegate. You can do this in code, or by dragging in interface builder. Try adding this to your viewDidLoad method: self.tableView.dataSource = self;
You probably want to set up your cells to use string identifiers in the inspector panel of Interface Builder. Then, in cellForRowAtIndexPath:, dequeue your cells using that identifier, instead of registering by class name.
As an aside, you can also use prototype cells with UICollectionView but the API and storyboard setup are very similar, and the same steps apply.
This one is driving me crazy - I don't know what am I missing.
here is my ViewController.
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
[self.tableView registerClass:[CurrentMatchCell class] forCellReuseIdentifier:#"CurrentMatchCell"];
self.tableView.delegate = self;
self.tableView.dataSource = self;
}
#pragma mark -
#pragma mark Table View Data Source Methods
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
NSLog(#"1");
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
NSLog(#"2");
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(#"3");
CurrentMatchCell *cell = (CurrentMatchCell *)[tableView dequeueReusableCellWithIdentifier:#"CurrentMatchCell"];
if (cell == nil) {
NSLog(#"XXX");
}
[cell.matchDescription setText: #"Home Team vs Away Team"];
return cell;
}
Here is screenshots from the app.
delegate and datasource are set programmatically.
cell attributes :
And the .h file :
#interface CurrentMatchesViewController : UIViewController <NSFetchedResultsControllerDelegate,UITableViewDelegate, UITableViewDataSource>
#property (weak, nonatomic) IBOutlet UITableView *tableView;
So, I can see logs 1,2,3 being printed out, cell is not nill but I do not see my content. Why is that?
I only see a number of empty white cells (even if I return 0 or whatever it does show the same every time).
Thanks
If you create your table view and your cell prototypes in a storyboard, the storyboard loader takes care of registering the cell prototypes that you defined in the storyboard. So:
You don't need to call registerClass:forCellReuseIdentifier: again in the code. This will actually mess up your storyboard settings.
You can also use dequeueReusableCellWithIdentifier:forIndexPath: instead of dequeueReusableCellWithIdentifier:. That method always returns a cell, so you don't have to have a nil check.
Edit: If that doesn't do the trick, try calling [self.tableView reloadData] after setting the delegate / data source, or set the delegate and data source in the storyboard.
It is because you're not loading your custom nib. Try this. (Make sure CurrentMatchCell is the name of your xib file).
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
UINib *nib = [UINib nibWithNibName:#"CurrentMatchCell" bundle:nil];
[self.tableView registerNib:nib forCellReuseIdentifier:#"CurrentMatchCell"];
self.tableView.delegate = self;
self.tableView.dataSource = self;
}
Edit: based on your comment: Don't register the custom cell class when using a storyboard.... it does that for you and it also sets the delegate. So try removing those lines from the viewdidload.... and second I would try actually making CurrentMatchesViewController a subclass of UITableViewController
I would like to call a method when a UITableViewCell is selected/tapped. I could do it easily with a static table view, but it requires a UITableViewController which is not good for me in this case, therefore I'm using a normal vc.
I have 10 specified methods like this:
- (void) methodOne {
NSLog(#"Do something");
}
- (void) methodTwo {
NSLog(#"Do something");
}
....
And I would like to call the methodOne when the first cell was tapped, call the methodTwo when the second cell was tapped and so on..
As a first step I set the numberOfRowsInSection to return 10 cells, but have no idea how could I connect the selected cells with the methods. Is there any quick way to do it? It would be a dirty solution to create 10 custom cells and set the every method manually for the custom cells, and there is no free place for it.
You can create an array of NSStrings with method names in the order they should be called from their corresponding UITableViewCells.
NSArray *selStringsArr = #[#"firstMethod", #"secondMethod", #"thirdMethod];
Then create a selector in tableView:didSelectRowAtIndexPath: from the strings array and call it using performSelector:.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *selString = selStringsArr[indexPath.row];
SEL selector = NSSelectorFromString(selString);
if ([self respondsToSelector:#selector(selector)]) {
[self performSelector:#selector(selector)];
}
}
Of course, there are some limitations to using performSelector: which you can read here.
You can use this method for whenever any cell is tapped on the table view
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSInteger selectedRow = indexPath.row; //this is the number row that was selected
switch (selectedRow)
{
case 0:
[self methodOne];
break;
default:
break;
}
}
Use selectedRow to identify which row number was selected. If the first row was selected, selectedRow will be 0.
Don't forget to set the table view's delegate to your view controller. The view controller also has to conform to the UITableViewDelegate protocol.
#interface YourViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>
As long as the table view has a data source and a delegate, it doesn't matter what kind of view controller it is on. All a UITableViewController really is is a UIViewController that already has a table view on it and is that table view's delegate and data source.
Can't figure out how to do UITableViewCell with custom mode with animation like this
make swipe on cell so UIPickerView will appear, like delete
I'm thinking I need to do in my controller in this method:
- (void)setEditing:(BOOL)editing animated:(BOOL)animated
{
[super setEditing:editing animated:animated];
[self.tableView setEditing:editing animated:animated];
//add something here
}
or in my custom cell class:
-(void)setEditing:(BOOL)editing animated:(BOOL)animated
found answer custom editingAccessoryView not working
You should add UIPickerView to your table cell as a subview
Add the custom picker as subview and keep it hidden.when you start editing in the delegate method make the view show by setting hidden property to no
When you are making cell to show in tableview in method -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath here you can add your UIPickerview according to your need to UITableViewCell like this-
[cell.contentView addSubview:pickerView];
hope this helps.
I've created a subclass of UITableViewCell for an iPad app. I need to dynamically generate text fields, take input from the user, and then store that information in an array. I thought of asking the UITableViewCell for the UITextField.text object, which would hold whatever the user wrote before my View Controller's segue (I'm saving the NSString objects upon the segue being called). So I've got an array of UITableViewCells which I ask for the UITextField.text object. But for some reason while my UITableViewCell subclass is being created, my UITextField is not. I can call UITableViewSubclass and it's initialized, but UITableViewSubclass.UITextField is nil.
Here's my UITableViewCell Subclass header (Yes, the UITextField is connected in the storyboard):
#import <UIKit/UIKit.h>
#interface ConditionCell : UITableViewCell
#property (strong, nonatomic) IBOutlet UITextField *condition;
#end
Here's my implementation file:
#import "ConditionCell.h"
#implementation ConditionCell
#synthesize condition;
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
// Initialization code
self.condition = (UITextField *)[self viewWithTag:10];
}
return self;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
#end
This here is the Table View Controller handling the table that contains the cells:
.h file:
#import <UIKit/UIKit.h>
#import "ConditionCell.h"
#interface ConditionsTableViewController : UITableViewController
#property (strong, nonatomic) NSMutableArray *conditionCellArray;
- (void)addNewConditionCell;
#end
.m file:
#import "ConditionsTableViewController.h"
#interface ConditionsTableViewController ()
#end
#implementation ConditionsTableViewController
#synthesize conditionCellArray = _conditionCellArray;
- (NSMutableArray *)conditionCellArray
{
if (_conditionCellArray == nil) {
// Create the array object
_conditionCellArray = [[NSMutableArray alloc] init];
}
return _conditionCellArray;
}
- (void)addNewConditionCell
{
ConditionCell *condCell = [[ConditionCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"conditionCell"];
[self.conditionCellArray addObject:condCell];
[self.tableView beginUpdates];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:self.conditionCellArray.count-1 inSection:0];
[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationTop];
[self.tableView endUpdates];
[self.tableView reloadData];
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#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.conditionCellArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"conditionCell";
ConditionCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[ConditionCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Configure the cell...
//cell.condition = (UITextField *)[cell viewWithTag:1];
return cell;
}
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the specified item to be editable.
return YES;
}
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
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
}
}
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Navigation logic may go here. Create and push another view controller.
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:#"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
*/
}
#end
This Table View Controller lives inside a UIView Controller as the table view does not take up the whole screen. When the user presses an 'ok' button there is a segue that is triggered and it is here that I ask this Table View Controller for the array containing the UITableViewCells, which I then run through a foreach to get their .text properties. Unfortunately I can't seem to get anything I input into the text fields, hence the .text's are always nil. If anyone could help me with this issue it would be greatly appreciated!
You might find this much easier to do using the free Sensible TableView framework. The framework has these text field cells out of the box, and can even create them automatically from your array.
I figured out a better way to do what I wanted to do here that works. Turns out that the way iOS's UITableView works is totally different from what I wanted to do. UITableView works by looking at your storyboard and given the identifiers for the cells, it creates them and allows you to set their properties within the cellForRowAtIndexPath method. However, when the cell goes offscreen, it is not retained as it's own separate object; it is reused. So, you can think of it as if when you scroll a table view, the cells that disappear to one end reappear on the other end with new information. This is key - UITableView want YOU to provide the cell's information. It was not made for input of information directly on a UITableViewCell, which is what I wanted to do.
So what I ended up doing was copy-pasting my cells into their own .xib file, and in the subclass initWithStyle:reuseIdentifier method, do:
NSArray *nibArray = [[NSBundle mainBundle] loadNibNamed:#"ConditionCell" owner:self options:nil];
self = [nibArray objectAtIndex:0];
And that creates the cell with whatever style - setup - UI elements you want.
Next, I want to hold on to a reference to the cell, because that cell has a textbox, and I need to save what's on the textbox when the user presses a "done" button. However, testing revealed the reuse problem I explained above. So how to do this? In my Table's view controller, whenever the user wants to add a new textbox (and presses the button to do so) I have a method which does
[self.conditionCellArray insertObject:[[ConditionCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"conditionCell"] atIndex:0];
This adds a new cell to an array - this is important because I need to have a reference to ALL cells at all times. (It is adding the cell at index 0 because I want to insert it at the top). Then, in the cellForRowAtIndexPath method, I did
return [self.conditionCellArray objectAtIndex:indexPath.row];
Which will return the corresponding cell. Bear in mind, from what I have read this whole thing about keeping a reference to each and every cell in the table is contrary to Apple's stated best practices when using UITableView. However, as I said before, UITableView is meant to display information, not to gather it from user input. So this is why I had to break the rules, if you will, to achieve the desired effect (that I wanted). I hope this helps others who are looking to do the same thing; and if there is a better way don't be shy about telling me.
EDIT: Oh by the way, when you copy paste the cells created in storyboard to their own .xib file make sure to disconnect any IBOutlets and change their class back to UITableViewCell. That way there won't be any problems or conflicts when you connect your .xib file cell.