Github: https://github.com/nneeranjun/Maps.git
I have a CoordinatesCustomCell (TableViewCell) which contains three labels (all of which I have linked properties in the CoordinatesCustomCell.h file). When I create a cell using the reuse identifier in my TableViewController and try to change the text of the labels, they don't appear to be changed when I run the app. Please view my code with the github link above.
DataTableViewController:
#import "DataTableViewController.h"
#import "CoordinatesCustomCell.h"
#import Firebase;
FIRDatabaseQuery*data;
#implementation DataTableViewController
- (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 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection: (NSInteger)section {
return 2;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
CoordinatesCustomCell *cell = [tableView dequeueReusableCellWithIdentifier:#"CoordinatesCustomCell" forIndexPath:indexPath];
cell.latitude.text = #"Hello";
cell.longitude.text = #"Hello";
// Configure the cell...
return cell;
}
#end
CoordinatesCustomCell.h:
#import <UIKit/UIKit.h>
#interface CoordinatesCustomCell : UITableViewCell
#property (weak, nonatomic) IBOutlet UILabel *index;
#property (weak, nonatomic) IBOutlet UILabel *latitude;
#property (weak, nonatomic) IBOutlet UILabel *longitude;
#end
You need the first call regiterNib or registerClass for your cell in viewDidLoad method
[self.tableView registerClass:[CoordinatesCustomCell class] forCellReuseIdentifier:#"CoordinatesCustomCell"];
or
[self.tableView registerNib:[UINib nibWithNibName:#"CoordinatesCustomCell" bundle:nil] forCellReuseIdentifier:#"CoordinatesCustomCell"];
if you use .xib or storyboard for prototype cell
Don't forget set
self.tableView.delegate = self;
self.tableView.datasource = self;
Related
I'm having two view controller A and B. when click button on view controllerA it will navigate to view controllerB and their is a tableview with textlabel,when i click on tableviewcell i want to navigate back into viewcontrollerA and want to pass that textlabel value back to viewcontrollerA
if you are using push seque is the worst way, reason you increase the memory in your stack trace.
you can do this in multiple ways, search once in google you get multiple answer related to this
UnWind Segue
Protocols & delegates
local database method
using Singleton class.
Using bean object method.
using Plist
finally go for NSUserDefault
I created a sample using Protocols and Delegates, as follows:
ViewController.m
#import "ViewController.h"
#import "ColorsTableViewController.h"
#interface ViewController () <ColorsDelegate>
#property (weak, nonatomic) IBOutlet UILabel *textDataLabel;
- (IBAction)goButtonTapped:(id)sender;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)sendColor:(NSString *)colorName{
self.textDataLabel.text = colorName;
}
- (IBAction)goButtonTapped:(id)sender {
ColorsTableViewController *colorsTableViewController=(ColorsTableViewController *)[self.storyboard instantiateViewControllerWithIdentifier:#"colorTableIdentifier"];
colorsTableViewController.delegate = self;
[self.navigationController pushViewController:colorsTableViewController animated:YES];
}
#end
ColorsTableViewController.h
#import <UIKit/UIKit.h>
#protocol ColorsDelegate <NSObject>
#optional
- (void)sendColor:(NSString *)colorName;
#end
#interface ColorsTableViewController : UIViewController
#property (nonatomic, assign) id<ColorsDelegate> delegate;
#end
ColorsTableViewController.m
#import "ColorsTableViewController.h"
#interface ColorsTableViewController () <UITableViewDelegate, UITableViewDataSource>
#property (weak, nonatomic) IBOutlet UITableView *colorsTableView;
#property (strong, nonatomic) NSArray *colorsArray;
#end
#implementation ColorsTableViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.colorsArray = #[#"Red",#"Green",#"Blue",#"Brown",#"Yellow"];
[self.colorsTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:#"colorCell"];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return self.colorsArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *myCell = [self.colorsTableView dequeueReusableCellWithIdentifier:#"colorCell" forIndexPath:indexPath];
UILabel *myTextLabel = [myCell.contentView viewWithTag:100];
if(!myTextLabel)
{
myTextLabel = [[UILabel alloc]initWithFrame:CGRectMake(10, 5, CGRectGetWidth(myCell.frame), CGRectGetHeight(myCell.frame))];
myTextLabel.tag = 100;
}
myTextLabel.text = self.colorsArray[indexPath.row];
[myCell.contentView addSubview:myTextLabel];
return myCell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *myCell = (UITableViewCell *)[self.colorsTableView cellForRowAtIndexPath:indexPath];
UILabel *myTextLabel = [myCell.contentView viewWithTag:100];
if(myTextLabel)
{
[_delegate sendColor:myTextLabel.text];
}
}
Screenshot:
Here is my GitHub Link, please download and check:
https://github.com/k-sathireddy/sendDataBack
I have a UITableView inside a UITableViewCell and I need to figure out how to set the sub table view datasource and delegate. At the moment this is what I have:
MainTableViewController.h
#import <UIKit/UIKit.h>
#interface MainTableViewController : UITableViewController <UITableViewDataSource, UITableViewDelegate>
#end
MainTableViewController.m
#import "MainTableViewController.h"
#import "TableViewCell.h"
#interface MainTableViewController ()
#property (weak, nonatomic) IBOutlet UITableView *tableView;
#end
#implementation MainTableViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - UITableView delegate functions
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 3;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellIdentifier = #"tableViewCell";
TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
cell.cellLabel.text = [NSString stringWithFormat:#"%ld", (long)indexPath.row];
return cell;
}
#end
TableViewCell.h
#import <UIKit/UIKit.h>
#interface TableViewCell : UITableViewCell <UITableViewDelegate, UITableViewDataSource>
#property (weak, nonatomic) IBOutlet UILabel *cellLabel;
#property (weak, nonatomic) IBOutlet UITableView *subTableView;
#end
TableViewCell.m
#import "TableViewCell.h"
#implementation TableViewCell
-(id)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if (self) {
self.subTableView.delegate = self;
self.subTableView.dataSource = self;
}
return self;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 1;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"subTabeViewCell"];
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"subTabeViewCell"];
cell.textLabel.text = #"test";
return cell;
}
#end
Because I can't ctrl + drag from my sub table view to the TableViewCell class, I'm trying to set the delegate and datasource programmatically within the initialisation, but it's not working and I'm just getting straight up confused.
I know I can set the datasource and delegate to connect to the first class and then within each of the delegate functions check to see which tableView I'm dealing with, but the with the nature of what I'm trying to do it won't really work, I've tried.
So all help is welcome
So I figured it out, well i figured out a way of doing it. Within the cellForRowAtIndexPath in the MainTableViewController.m, I simply added:
[cell.subTableView setDelegate:cell];
[cell.subTableView setDatasource:cell];
And all is working away
Having an issue where the array values do not display in my tableview cells, but can be printed out correctly with NSLog. Thanks in advance for your help!
TableViewCell .h
#import <UIKit/UIKit.h>
#interface TableViewCell : UITableViewCell
#property (strong, nonatomic) IBOutlet UIImageView *image;
#property (strong, nonatomic) IBOutlet UILabel *label;
#end
TableViewController.h
#import <UIKit/UIKit.h>
#interface TableViewController : UITableViewController <UITableViewDataSource, UITableViewDelegate>
#property(nonatomic, strong) NSMutableArray *imagesArray;
#property(nonatomic, strong) NSMutableArray *namesArray;
#end
TableViewController.m
#import "TableViewController.h"
#import "TableViewCell.h"
#interface TableViewController ()
#end
#implementation TableViewController
#synthesize primaryWeaponNames = _primaryWeaponNames;
- (void)viewDidLoad {
[super viewDidLoad];
[self setupArrays];
}
- (void)setupArrays {
_namesArray = [[NSMutableArray alloc] initWithObjects:
#"NAME1", #"NAME2", #"NAME3"
nil];
self.imagesArray = [[NSMutableArray alloc] initWithObjects:
#"IMG1", #"IMG2", #"IMG3"
nil];
}
- (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 _namesArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"TableViewCell";
TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
cell.nameLabel.text = [NSString stringWithFormat:#"%#", [_namesArray objectAtIndex:indexPath.row]];
NSLog(#"%#", _namesArray[indexPath.row]);
cell.image.image = [self.imagesArray objectAtIndex:indexPath.row];
[cell setAccessoryType: UITableViewCellAccessoryDisclosureIndicator];
return cell;
}
When you make the cell in a xib file, you should register the nib in viewDidLoad. Since you didn't do that, the dequeue method will return nil, and you're just creating a default cell (in the if (cell == nil) clause) instead of your custom cell. The default cell doesn't have a nameLabel or image property, so the lines to set the values of those outlets won't do anything.
[self.tableView registerNib:[UINib nibWithNibName:#"Your nib name here" bundle:nil] forCellReuseIdentifier:#"TableViewCell];
In your TableViewController class, you need to include
self.tableView.delegate = self;
self.tableView.datasource = self;
in your viewDidLoad method. Or you can do this in interface builder by right click dragging the table view in your tableview controller to file's owner and setting delegate, then repeat for datasource
In my application, there's a Navigation View(Embed In), a Table View Controller, and a View Controller. And in the ViewController.h, there are...
#property (strong, nonatomic) IBOutlet UILabel *timeDisplay;
#property (strong, nonatomic) IBOutlet UILabel *minuteDisplay;
#property (strong, nonatomic) IBOutlet UILabel *timerDisplay;
#property (strong, nonatomic) IBOutlet UILabel *titleLabel;
and more outlets. The code below is TableViewController.m file. I have a action button(plusbtn), which needs to add a cell in the table view. So, I tried to make the 'plusbtn' do it, but it didn't work. What should I do? Please help me...
#import "TableViewController.h"
#import "TableViewCell.h"
#import "ViewController.h"
#interface TableViewController ()
#property (nonatomic) ViewController *viewController;
#property (strong, nonatomic) NSMutableArray *titleArray;
#property (strong, nonatomic) NSMutableArray *tsArray;
#property (strong, nonatomic) NSMutableArray *tmArray;
#property (strong, nonatomic) NSMutableArray *ttArray;
#property (strong, nonatomic) NSString *cellplustitle;
#property (strong, nonatomic) NSString *cellplustime;
#property (strong, nonatomic) NSString *cellplusmin;
#property (strong, nonatomic) NSString *cellplussec;
#end
#implementation TableViewController
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
_cellplustitle = self.viewController.titleLabel.text;
_cellplustime = self.viewController.timeDisplay.text;
_cellplusmin = self.viewController.minuteDisplay.text;
_cellplussec = self.viewController.timerDisplay.text;
self.titleArray = [NSMutableArray new];
self.tsArray = [NSMutableArray new];
self.tmArray = [NSMutableArray new];
self.ttArray = [NSMutableArray new];
// 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.titleArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"TableViewCell" forIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryNone;
cell.celltitle.text = [self.titleArray objectAtIndex:indexPath.row];
cell.cellmd.text = [self.tmArray objectAtIndex:indexPath.row];
cell.cellsd.text = [self.tsArray objectAtIndex:indexPath.row];
cell.celltd.text = [self.ttArray objectAtIndex:indexPath.row];
// Configure the cell...
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 - 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.
}
*/
- (IBAction)plusbtn:(id)sender {
[self.tableView beginUpdates];
[self.titleArray addObject:self.cellplustitle];
[self.tsArray addObject:self.cellplussec];
[self.tmArray addObject:self.cellplusmin];
[self.ttArray addObject:self.cellplustime];
NSIndexPath *indexPathOfNewItem = [NSIndexPath indexPathForRow:(self.titleArray.count - 1) inSection:0];
[self.tableView insertRowsAtIndexPaths:#[indexPathOfNewItem] withRowAnimation:UITableViewRowAnimationAutomatic];
[self.tableView endUpdates];
[self.tableView scrollToRowAtIndexPath:indexPathOfNewItem atScrollPosition:UITableViewScrollPositionBottom animated:YES];
}
#end
ReloadData should work. If its not working if you put if between beginUpdate and endupdate, then comment rest code and simply try to reload table view after adding item in array. Like...
- (IBAction)plusbtn:(id)sender {
[self.titleArray addObject:self.cellplustitle];
[self.tsArray addObject:self.cellplussec];
[self.tmArray addObject:self.cellplusmin];
[self.ttArray addObject:self.cellplustime];
[self.tableview reloadData];}
Hope this helps?
you have to reload the uitableview using
[self.tableView reloadData];
Hope it helps!
I have a view controller with a static cell named 'Make' I have two controllers one called "AddCarTableViewController" and "MakeTableViewController" when you click on the static cell named 'Make' it presents the make table view controller where you can select the make, then pops the view controller and am trying to store the selected value in the detailTextLabel of the static cell. here is my code for all the controllers.
The problem I'm having is once I select the make everything happens as it should I even log the selected item and it saves it after popping the view controller, but I can't figure out how to implement selected item into the detailTextLabel. Any help will be much appreciated!
"MakeTableViewController.h"
#import <UIKit/UIKit.h>
#import "AddCarTableViewController.h"
#protocol CarMakeDelegate <NSObject>
- (void)updateCarMake:(NSString *)updateMake;
#end
#interface MakeTableViewController : UITableViewController
#property (nonatomic, strong) NSArray *carMakes;
#property (nonatomic, weak) id <CarMakeDelegate> delegate;
#end
MakeTableViewController.m
#import "MakeTableViewController.h"
#interface MakeTableViewController ()
#end
#implementation MakeTableViewController {
NSIndexPath *oldIndexPath;
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.carMakes = [[NSArray alloc] initWithObjects:#"Acura", #"Aston Martin", nil];
}
- (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.carMakes 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 = [self.carMakes objectAtIndex:indexPath.row];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView deselectRowAtIndexPath:indexPath animated:NO];
oldIndexPath = indexPath;
NSString *addMake = self.carMakes[indexPath.row];
[self.delegate updateCarMake:addMake];
NSLog(#"%#", addMake );
[[self navigationController] popViewControllerAnimated:YES];
}
#end
AddCarTableViewController.h
#import <UIKit/UIKit.h>
#import "MakeTableViewController.h"
#interface AddCarTableViewController : UITableViewController
#property (strong, nonatomic) NSString *makeName;
#property (weak, nonatomic) IBOutlet UITableViewCell *makeCell;
#end
AddCarTableViewController.m
#import "AddCarTableViewController.h"
#interface AddCarTableViewController ()
#end
#implementation AddCarTableViewController
- (void)viewDidLoad
{
[super viewDidLoad];
}
#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 4;
}
-(void)updateCarMake:(NSString *)updateMake {
self.makeCell.detailTextLabel.text = updateMake;
}
#end
You don't need to use delegate in this case. Just update the underlying data model. and call
[tableview reloadData];
When the makeViewController is popped.
In the AddCarVC's cellForRowAtIndex, add another line to check if current indexPath corresponds to Make cell and if it does update the detailLabel text.