I have a viewcontroller set up on my storyboard, and I have inserted a tableView inside this view controller. I want to do a [self.tableView reloadData]; on viewDidLoad, but it says the property tableView isn't found.
Here is what the code for my tableView in the viewcontroller.m file looks like:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
return #"Shared with";
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return activeUsers.count;
}
- (sharedUsersTable *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"sharedUser";
sharedUsersTable *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[sharedUsersTable alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
NSDictionary *key = [activeUsers objectAtIndex:indexPath.row];
NSString *name = [key objectForKey:#"shared_user_name"];
NSString *email = [key objectForKey:#"email"];
cell.textLabel.text = [NSString stringWithFormat:#"%#", name];
cell.detailTextLabel.text = [NSString stringWithFormat:#"%#", email];
return cell;
}
Am I missing some special command to call a tableView inside a view controller which isn't a TableViewCOntroller?
You need to make a IBOutlet of tableView and call reloadData on that.
This depends on how you declared your UITableView.
If it is a property (#property (nonatomic, strong) UITableView *myTableView), it will be [self.myTableView reloadData]. If you declared it as just an instance variable (UITableView *_myTableView), it will be [_myTableView reloadData].
you'll have to define tableview datasource and delegate as self.. like table.datasource=self,
and table.delegate=self.....you can do it in viewdidload....but if you have downloaded the data somewhere, then you can do it in that place where you have downloaded and reload the table there. please assign the delegate and datasource to the table and reload the tableview after you have downloaded the data....and please make a property like(#property (nonatomic, strong) UITableView *table)and use self when you do the reload...
Related
I a UITableView called tableView. It's data array called namesArray.
I have a function that adds a name to the array that looks like this:
-(void)addName:(NSString*)name
{
[self.namesArray addObject: name];
[self.tableView reloadData];
}
After I call reloadData on tableView, the last cell (the one that was added) is not showing on tableView, numberOfRowsInSection return the actual number so there is a space for another cell but there is not an actual cell.
I was debugging cellForRowAtIndexPath and I was found out that when cellForRowAtIndexPath called for the new cell, dequeueReusableCellWithIdentifier returns nil while when it called to the other cells (except when indexPath.row == 0 of course) it returns a cell.
The code for cellForRowAtIndexPath:
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier=#"Cell";
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (!cell) {
cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
cell.textLabel.text=[self.namesArray objectAtIndex:indexPath.row];
return cell;
}
numberOfRows:
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.namesArray.count;
}
Note: if I try to print the last object of namesArray using NSLog it's looking fine (the last object is the new one that was created) so it's a problem with reloading the data of tableView
Can you please help me? Thanks!
check the number of rows you returns in numberOfRowsInSection
- (NSInteger)tableView:(UITableView *)tableView
numberOfRowsInSection:(NSInteger)section
it should be something like:
[self.namesArray count];
First dataSource and delegate the tableview. after that make sure using below method with perfection
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [your array count];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier=#"Cell";
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (!cell) {
cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
cell.textLabel.text=[self.namesArray objectAtIndex:indexPath.row];
return cell;
}
After that reload tableView with
[_tableViewName reloadData];
-(void)addName:(NSString*)name
{
[self.namesArray addObject: name];
[self.tableView reloadData];
}
If you are calling this function again and again to fill the array then, do not reload tableview in this method. Because, its getting reloaded overtime you call this method and cellForRowAtIndexPath gets called every time. So, after your array gets filled completely then, reload the tableview
.h
#interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>
{
IBOutlet UITextField *txtName;
IBOutlet UITableView *tableObject;
NSMutableArray *namesArray;
}
- (IBAction)btnAdd:(UIButton *)sender;
.m
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
namesArray = [[NSMutableArray alloc] init];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;
{
return namesArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
{
static NSString *cellIdentifier=#"Cell";
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (!cell) {
cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
cell.textLabel.text=[namesArray objectAtIndex:indexPath.row];
return cell;
}
-(void)addName:(NSString*)name
{
[namesArray addObject: name];
[tableObject reloadData];
}
- (IBAction)btnAdd:(UIButton *)sender {
[self addName:txtName.text];
}
I have a button, a pickerview and a tableview. When I push the button, the current selection of pickerview will be filled in the table view. Here is the code of button which pick value from pickerview
- (IBAction)addCourse:(UIButton *)sender {
NSInteger numRow=[picker selectedRowInComponent:kNumComponent];//0=1st,1=2nd,etc
NSInteger SeaRow=[picker selectedRowInComponent:kSeaComponent];//0=fall,1=spring,2=summer
NSInteger CourseRow=[picker selectedRowInComponent:kCourseComponent];
NSString *num=Number[numRow];
NSString *season=Season[SeaRow];
NSString *course=Course[CourseRow];
NSString *msgCourse=[[NSString alloc ]initWithFormat:#"%# ",course];
NSString *msgSeason=[[NSString alloc ]initWithFormat:#"%# ",season];
NSString *msgYear=[[NSString alloc ]initWithFormat:#"%# ",num];
}
Then I want to populate msgCourse,etc to my tableview
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
...Content from above msgCourse and etc
return cell;
}
How to fix the gap in my second part please? Or any example to look at please?
Check the following code to decide whether or not that fits into your requirements based on what I understand from your question. If it does not, please leave a comment then I will try my best to follow up.
First Step: if you have not done the delegation via storyboard, here is the first thing that you should do programatically:
-(void)ViewDidLoad
{
tableView.delegate = self;
tableView.datasource = self;
}
Second Step: I have not seen a mutablearray in your code, but I assume that you are going to make msgCourse to NSMutableArray.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// I assume you have only one section
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [self.msgCourse count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = nil;
cell = [tableView dequeueReusableCellWithIdentifier:#"Cell"];
if(!cell){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"Cell"];
}
cell.textLabel.text=[self.msgCourse objectAtIndex:indexPath.row];
return cell;
}
Last Step: By the way, do not forget to add the following line of code into your button action to reload your tableView, I assume you update the NSMutableArray and would like to refresh the tableView.
- (IBAction)addCourse:(UIButton *)sender {
.....
.....
.....
[tableView reloadData];
}
Here is the good tutorial, it is worth to duplicate for the sake of learning: http://www.appcoda.com/ios-programming-tutorial-create-a-simple-table-view-app/
I can't find a simple, concise answer anywhere and I refuse to believe that XCode makes things as hard as other tutorials I've found out there...
Say I have the following array
NSArray* days = [NSArray arrayWithObjects:#"Sunday",#"Monday",#Tuesday",#"Wednesday",#"Thursday",#"Friday",#"Saturday",nil];
I have a UI Table View, table_Days, that I would like to simply show the items from my array. What is the proper way to go about populating my table?
Here's my full explanation, starting with a case extremely similar to yours:
http://www.apeth.com/iOSBook/ch21.html#_table_view_data
So suppose days is stored as an instance variable accessed through a property self.days. Then set self as the table view's datasource and use this code:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
if (!self.days) // data not ready?
return 0;
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView
numberOfRowsInSection:(NSInteger)section {
return [self.days count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell =
[tableView dequeueReusableCellWithIdentifier:#"Cell"
forIndexPath:indexPath];
cell.textLabel.text = (self.days)[indexPath.row];
return cell;
}
You should populate your table view using the data source methods. Returning the count of the array for the number of rows.
If you need to detect when a user taps on a cell you can use the delegate methods.
#interface ViewController<UITableViewDataSource, UITableViewDelegate>
#property (nonatomic, copy) NSArray *days;
#property (nonatomic, strong) UITableView *tableDays;
#end
#implementation ViewController
-(void)viewDidLoad
{
[super viewDidLoad];
UITableView *tableDays; // Set this up
[tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:#"Cell"];
tableDays.delegate = self;
tableDays.dataSource = self;
[self.view addSubview:tableDays];
self.tableDays = tableDays;
self.days = #[#"Sunday", #"Monday", #"Tuesday", #"Wednesday", #"Thursday", #"Friday", #"Saturday"];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [self.days count];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell" forIndexPath:indexPath];
cell.textLabel.text = self.days[indexPath.row];
return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *day = self.days[indexPath.row];
NSLog(#"Day tapped: %#", day);
}
#end
You should consider using a UITableViewController if you just want to show a table view.
Note that its better practice to use camel case for variables.
I am beginning with iOS have a silly problem. I just want to show a TableView populated with strings that are stored in a NSMutableArray. I can see that the strings are in the array, but for some reason the TableView is not showing them.
I have bascially this:
#interface Test ()
#property (weak, nonatomic) IBOutlet UITableView *contactList;
#property (strong, nonatomic) NSMutableArray *contactsArray;
#end
- (void)onContactFound:(NSString*)contact
{
[self.contactsArray addObject:contact];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [self.contactsArray count];
}
//4
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
//5
static NSString *cellIdentifier = #"SettingsCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
//6
NSString *tweet = [self.contactsArray objectAtIndex:indexPath.row];
//7
[cell.textLabel setText:tweet];
[cell.detailTextLabel setText:#"via Codigator"];
return cell;
}
I think the problem is in the last part. I copied this code from an example (http://www.codigator.com/tutorials/ios-uitableview-tutorial-for-beginners-part-1/) that said I should add some dynamic properties but in my TableView I do not have these properties in the attributes inspector so basically I do not have the #"SettingsCell" so I guess this is one of the problems at least, maybe this code does not apply in my case and it should be done in another way?
I think you are trying to dequeue a cell without ever creating cells. I think you only get nil cells back. You should use something like this:
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier] autorelease];
}
Also have a look in the API documentation which states:
dequeueReusableCellWithIdentifier: Returns a reusable table-view cell object located by its identifier.
Return Value: A UITableViewCell object with the associated identifier or nil if no such object exists in the reusable-cell queue.
dequeueReusableCellWithIdentifier:
I'm a new programmer in Objective-C and I have a terrible problem in my first application.
I have one class called Places (NSObject) where I found places in a Google places and return an NSArray.
I have another classe called DisplayPlaces (UiViewController). This class imports my "Place.h".
In my viewDidLoad I have this code:
Places *places = [[Places alloc]init];
[places.locationManager startUpdatingLocation];
[places LoadPlaces:places.locationManager.location];
[places.locationManager stopUpdatingLocation];
[places release];
In my method LoadPlaces I load JSON URL and put a result in NSDictionary after I get only places and put in NSArray and return.
Into my Places I alloc my DisplayPlaces and call a method ReturnPlaces: NSArray to return places that I found.
- (void)ReturnPlaces:(NSArray *)locais{
placesArray = locais;
[self.UITableView reloadData];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return [placesArray count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIndentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIndentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIndentifier] autorelease];
}
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
cell.textLabel.text = [placesArray objectAtIndex:indexPath.row];
return cell;
}
It all works.
My problem is:
In my ReturnPlaces: NSArray I call [MyUiTableView reloadData] but I can't refresh my UiTableView.
What can I do?
Set your tableview yourTableView as your property and use
self.yourTableView = tableView; // for assigning the tableView contents to your property
if you are reloading inside any method for tableView, just use
[tableView reloadData];
if you are reloading outside your tableView methods, use
[self.yourTableView reloadData];
Are you calling reloadData on the instance of your tableView. In other words if you have
MyUITableView *mytableView;
then reloading it would require you call
[mytableView reloadData];
not
[MyUITableView reloadData];