I have a UITableView with 2 sections. In my first section, there are 5 rows. In second section there are 2 rows. When I click on an add button,this table view has to be replicated again and again. How can I do that?
-(IBAction)addDetails:(id)sender
{
NSLog(#"value of s is %d,%d",s,210+100*s);
tvc = [[UITableViewController alloc] initWithStyle:UITableViewStyleGrouped];
tvc.tableView.frame = CGRectMake(20,200+250*s,280,280);
//CGRect rect = CGRectMake(cell.bounds.origin.x+10, cell.bounds.origin.y+10,50,30);
[tvc.tableView setSectionFooterHeight:3.0];
[tvc.tableView setSectionHeaderHeight:3.0];
[tvc.tableView setShowsVerticalScrollIndicator:YES];
// [tvc.tableView setBackgroundColor:[UIColor colorWithRed:67.0/255.0 green:185.0/255.0 blue:209.0/255.0 alpha:0.5]];
[tvc.tableView setRowHeight:30];
tvc.tableView.backgroundView = nil;
tvc.tableView.backgroundColor = [UIColor clearColor];
[tvc.tableView setSeparatorStyle:UITableViewCellSelectionStyleGray];
tvc.tableView.delegate = self;
tvc.tableView.dataSource = self;
[self.view addSubview:tvc.tableView];
s++;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 2;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if(section == DETAIL_SECTION)
return 5;
else if(section == CALENDER_SECTION){
return 2;
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
}
When the addDetails Function is invoked again,I want the same table structure with different data in it within the same frame.Now frame is getting repeated.
Please help me to solve this issue
When you click on the add button, create a new UITableView instance, add it to an existing view as a subview. Position and size it according to your needs. Set its delegate and datasource to be the same delegate and datasource as the original. This way, the same delegate/datasource methods will act on each of the tables using the same logic. Whenever you reload the original table, be sure to reload all 'replicated' tables.
Related
I'm struggling for a long time of this problem.
The reason was I had Collection delegate & datasource under the "CollectionView" not "CollectionView Controller" because I embedded one collectionView in the one of TableView Cell
but when I want to set up the
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)
{
}
This is my code
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString * Cell;
if (indexPath.section==0)
{
switch (indexPath.row)
{
case 0:
Cell = #"MoviesIntro";
break;
case 1:
Cell = #"影片介紹";
break;
case 2:
Cell = #"Moviesrelative";
default:
break;
}
}
UITableViewCell *cell =[tableView dequeueReusableCellWithIdentifier:Cell];
if (!cell)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:Cell];
}
switch (indexPath.row)
{
case 0:
{
}
break;
case 1:
{
}
break;
case 2:
{
Tony=(CollectionView*)[cell viewWithTag:741];
Tony.pageImages =imagearray;
[Tony reloadData];
}
break;
default:
break;
}
return cell;
}
Here is CollectionView.m Code
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
self.pic_url=[comment[indexPath.row] objectForKey:#"pic_url"];
self.name_zh=[comment[indexPath.row] objectForKey:#"name_zh"];
self.name_en=[comment[indexPath.row]objectForKey:#"name_en"];
self.intro=[comment[indexPath.row] objectForKey:#"short_Intro"];
self._id=[comment[indexPath.row] objectForKey:#"_id"];
self.trailer=[comment[indexPath.row] objectForKey:#"trailer"];
self.movieTime=[comment[indexPath.row] objectForKey:#"movieTime"];
self.picH_url=[comment[indexPath.row] objectForKey:#"picH_url"];
self.category=[comment[indexPath.row] objectForKey:#"category"];
self.director=[comment[indexPath.row] objectForKey:#"director"];
self.actor=[comment[indexPath.row] objectForKey:#"actor"];
self.language=[comment[indexPath.row] objectForKey:#"language"];
self.MyList=false;
[UIView animateWithDuration:0.05 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
} completion:^(BOOL finished) {
}];
}
Tony is Collection view.h/m files. pageImages is NSMutableArray on the Tony.h files.
to go to other view controller, property not found on object so I don't even know what can i do is anyone have good idea？？
You can set add a delegate variable of your UITableViewCell and a delegate method like:
- (void) pushToViewController;
Then in YourTableViewCell.m file collectionView delegate methods add:
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *){
[delegate pushToViewController];
}
And "tableView Controller"should be the delegate of your tableViewCell, in the controller of UITableView :
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
YourTableViewCell *cell = ...
cell.delegate = self;
}
- (void) pushToViewController {
[self.navigationController pushViewController:someViewController animated:YES];
}
William Hu's suggestion will work.
In general you should not let your UI items implement their own delegates and data sources. It works but breaks the MVC pattern. Instead of that I'd use some custom UICollectionView to hold some reference to the row of the table to which it belongs. You could even 'abuse' the tag property for that (which I personally don't like but is is quite a common pattern) without the need to subclass UICollectionView.
Your UITableViewController can implement the datasource and delegate for the collection views too. On each call of any delegate method a reference to the very collectionView is handed into the method so that you can get the row of the table from there (which you have to set in the table view's cellForRowAtIndexPath of course) and go from there.
Therefore I'd rather suggest re-factoring your code and stick to the MVC pattern.
in an OSX app i'm currently developping to get familiar with obj-c, I want to populate a TableView. After some hours spent reading way too much blog posts, I can't understand how to add a row in my TableView.
Here is what I've done following this guide:
I have an NSMutableArray in my ViewController, this ViewController implement both interfaces NSTableViewDataSource and NSTableViewDelegate. And I implement both methodes as indicated in the guide. I also have a button and a tableView. When I click on the button, I fill my array with my own object, that's works great.
But what I want now, is when my array is populated, my tableview is too. I'm aware I need to bind those two in some way, but I have no idea how, can someone give some indication ?
Here is my code for my ViewController:
- (void)viewDidLoad {
[super viewDidLoad];
self.tableViewEpisodes.delegate = self;
self.tableViewEpisodes.dataSource = self;
}
- (IBAction)btRefresh:(id)sender {
CalendarReader* reader = [[CalendarReader alloc]init];
self.episodes = [Episode getEpisodeFromEKEvents:[reader getLastMonthEventsForCalendarName:#"TV Shows"]];
[self.tableViewEpisodes reloadData];
}
- (NSInteger)numberOfSectionsInTableView:(NSTableView *)tableView
{
return [self.episodes count];
}
- (NSView *)tableView:(NSTableView *)tableView viewForTableColumn:(NSTableColumn *)tableColum row:(NSInteger)row {
// Retrieve to get the #"MyView" from the pool or,
// if no version is available in the pool, load the Interface Builder version
NSTableCellView *result = [tableView makeViewWithIdentifier:#"MyView" owner:self];
// Set the stringValue of the cell's text field to the nameArray value at row
result.textField.stringValue = [self.episodes objectAtIndex:row];
// Return the result
return result;
}
First, you are creating a cell view with an identifier which you have not declared, you need to do something like this (assuming you correctly adopted the UITableView protocol in your class):
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *Ident = #"Ident";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:Ident];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:Ident] autorelease];
}
[cell.textLabel setText: [yourArray objectAtIndex:indexPath.row];
return cell;
}
This is a delegate method for your NSTableView. It is called when the view is loaded so you need to provide a data source at runtime.
Second, I'm assuming you want one section with a number of rows equal to your data array. If this is so, you need to change the delegate method:
- (NSInteger)numberOfSectionsInTableView:(NSTableView *)tableView
to:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
Finally, keep in mind these above methods populate the ROWS, not the COLUMNS as you have it now. Once you populate your array, you need to invoke the method:
[yourTableView reloadData]
In order to refresh the table.
Hope this helps.
Thanks to #bryan-wheeler, I notice a message log when testing his code, and I found out, I was not implementing the correct method: here is my code for my ViewController now:
- (void)viewDidLoad {
[super viewDidLoad];
self.tableViewEpisodes.delegate = self;
self.tableViewEpisodes.dataSource = self;
}
- (NSInteger)numberOfRowsInTableView:(NSTableView *)tableView
{
return 1;
}
-(id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)aTableColumn row:(NSInteger)rowIndex{
return [self.episodes objectAtIndex:rowIndex];
}
For beginner like me, you'll also have to implement the NSCopying protocol for the class stored in your data source array.
Right now, I only have one element in my TableView and it only show its memory address, but I'll update this answer as soon as I found out how to make it works for future beginner in my case.
EDIT: OK, it works !! My mistake was that: in the tableView:objectValueForTableColumn:row: method, I though I needed to return the Object representing the row given in parameter, but I had to return the one for the AND the cell given in parameter, now I found out, it's pretty obvious, but as a French, I didn't understand the method name correctly. Here is my code now:
- (void)viewDidLoad {
[super viewDidLoad];
self.tableViewEpisodes.delegate = self;
self.tableViewEpisodes.dataSource = self;
}
- (NSInteger)numberOfRowsInTableView:(NSTableView *)tableView
{
return [self.episodes count];
}
-(id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)aTableColumn row:(NSInteger)rowIndex{
if([[aTableColumn title] isEqual: #"Serie's name"]){
return [[self.episodes objectAtIndex:rowIndex] seriesName];
}else if([[aTableColumn title] isEqual: #"Season number"]){
return [NSString stringWithFormat:#"%ld", (long)[[self.episodes objectAtIndex:rowIndex] seasonNumber]];
}else if([[aTableColumn title] isEqual: #"Episode number"]){
return [NSString stringWithFormat:#"%ld", (long)[[self.episodes objectAtIndex:rowIndex]episodeNumber]];
}else{
return nil;
}
}
There is some optimisation to do for sure, feel free to propose. But it's doing the job.
// i am creating tableview in for loop. after looping once, tableview delegate/datasource methods needs to call. But here methods(delegate/datasource) are calling after finishing loop
//Note: i am displaying all tables in scrollview based on page
controller
// here is my code
for(int i=0; i < 10; i++)
{
table_obj[i] = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, 700, 500)];
table_obj[i].separatorStyle = UITableViewCellSeparatorStyleNone;
table_obj[i].separatorColor = [UIColor clearColor];
table_obj[i].delegate = self;
table_obj[i].dataSource = self;
table_obj[i].backgroundColor = [UIColor clearColor];
[scrollview addSubview:table_obj[i]];
[table_obj[i] reloadData];
}
//data is loading only in 10th table. not in all tables
If you are reloading your table after that, then it should work fine.
I think the views that your are adding in that, rather than adding that in your - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
mehod, try using custom cell concept. and reload your table whenever you are going from one table view to another tableview.
Custom cell tutorial.
I think you should use tag(table_obj[i] = i) to judge the delegate is invocated by which tableView.
for example :
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
switch (tableView.tag) {
case 0:
//do something
break;
case 1:
//do something
break;
... ...
default:
break;
}
}
Thats because when you set the delegate/dataSource to self, in the loop it gets overriden and will have the last one in the array as the current delegate/dataSource.
You can set 'tags' in your tableViews and then in the callbacks do manipulation based on the tag of the tableView.
Another option will be to loop through the array of tableViews to get the current one, but that isnt very efficient, so I believe the first option is better.
I've recently found a way to solve displaying a button when data exists and not when no data is in a cell. Specifically using Storyboards in a detail view (static cell). This button is a necessity on the Storyboard due to some seque wiring I've hooked up.
I placed a custom button with no background image on it, and set a tag value of the tableviewcell to 1.
Then in my implementation file I've overridden the cellForRowAtIndexPath.
My question is, while this works fine, is it performance intensive? I have only 5 cells in this MOC. Here's my code:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [super tableView:tableView cellForRowAtIndexPath:indexPath];
// need to capture the section and the cell to modify....
if (cell.tag == 1){
if (self.map){
self.mapButton.enabled = YES;
self.mapLabel.text = #"Click Map for Pic Location...";
UIImage *buttonImage = [UIImage imageNamed:#"MyMap.png"];
[self.mapButton setBackgroundImage:buttonImage forState:UIControlStateNormal];
} else{
self.mapLabel.text = #"No Location found for Pic";
self.mapButton.enabled = NO;
}
}
return cell;
}
I'm trying to load a single custom cell into a UITableView and it keeps throwing an error
UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath:
I have no idea why. I have linked my table view cell to the UITableViewCell definition in my code, but it keeps giving me this error. Here is my code; any help would be greatly appreciated.
#import "RegisterDeviceViewController.h"
#implementation RegisterDeviceViewController
#synthesize checkString;
#synthesize cellRegistration;
// The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization.
}
return self;
}
*/
//Change UITableView Style to Grouped
- (id)initWithStyle:(UITableViewStyle)style {
// Override initWithStyle: if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
style = UITableViewStyleGrouped;
if (self = [super initWithStyle:style]) {
}
return self;
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
self.title = #"Registration";
[super viewDidLoad];
}
// 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 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.section == 1) {
if (indexPath.row == 1) {
return cellRegistration;
}
}
return nil;
}
//Pass search type over to rootViewController section2
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:#"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
*/
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc. that aren't in use.
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
#end
Okay. That's not how UITableView works. When the table view needs to draw a cell (ie, a row); it invokes tableView:cellForRowAtIndexPath: on the object specified in the dataSource property. It's your job to return a UITableViewCell from that method. This is how Apple does it (and how you should do it):
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"AnIdentifierString"];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:#"AnIdentifierString"] autorelease];
}
cell.textLabel.text = #"This text will appear in the cell";
return cell;
}
The number of times that method will be invoked depends on the number of sections in the table view and the number of rows in each section. The process works like this:
Table View invokes the delegate method numberOfSectionsInTableView: on its dataSource (it knows it implements that method because the dataSource must adhere to the UITableViewDataSource protocol).
If numberOfSectionsInTableView: returns a number greater than zero, the table view will invoke the delegate method tableView:numberOfRowsInSection: on the dataSource. So if numberOfSectionsInTableView: returns 2, tableView:numberOfRowsInSection: will be invoked twice.
If each invocation of tableView:numberOfRowsInSection: returns a number greater than zero, the table view will invoke the delegate method tableView:cellForRowAtIndexPath: on the dataSource' So if tableView:numberOfRowsInSection: returns 5, tableView:numberOfRowsInSection: will be invoked five times (once for each individual row).
Your opportunity to customise how that cell appears is after you've received a useable cell, but before it is returned (where 'This text will appear in the cell' appears above). You can do quite a lot here; you should see the Class Reference for UITableViewCell to see everything you can do (all I've done is set it to show 'This text...'). The lines above that are a way for iOS to reuse cells for performance considerations. If you, for example, wanted to show a certain string from an array of strings, you could do this (notice the use of the indexPath variable): cell.textLabel.text = [someArrayYouHave objectAtIndex:indexPath.row];.
You wrote:
it keeps throwing an error
'UITableView dataSource must return a
cell from
tableView:cellForRowAtIndexPath:' But
I have no idea why..
But your -tableView:cellForRowAtIndexPath: says, in part:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
//...
return nil;
}
After reading the error message and looking at the code, do you not see the problem?
You are returning only one section, only one row
the section count and row count starts from 0.
Thats y you are getting this kinda error
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.section == 0) {
if (indexPath.row == 0) {
//this checking is no necessary, anyway if you want use like this
//ensure that cellRegistration is UITableViewCell
return cellRegistration;
}
}
return nil;
}
Also refer this post for loading custom cells.
New iOS7+ solution optimized for Smoother Scrolling
You already can see old solutions but as far as huge amount of Apps will continue only iOS7+ support here is a way more optimized and correct solution.
Cell initialization
To initialize cell just call dequeueReusableCellWithIdentifier and iOS7+ systems are enough smart to handle if cell == nil or not. If during dequeue cell is nil system will automatically make a cell for you.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"cellIdentifier" forIndexPath:indexPath];
return cell;
}
Cell configuration
Then do your entire cell configuration in willDisplayCell method. Just create one method in your class that configures cell and here you go with better performance!
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
[self configureCell:cell forRowAtIndexPath:indexPath];
}
- (void)configureCell:(UITableViewCell *)cell
forRowAtIndexPath:(NSIndexPath *)indexPath {
// Configure your cell
}