here is the thing. I have a tableview with a variable number of rows. When you tap one of them, a detail view is shown.
Everything is ok if you tapped rows from 0 to 9, 11 to 19, 21 to 29 etc... But it doesn't work for rows number 10, 20, 30 etc... Even a long tap is detected on this rows, so an alert is shown, in order to delete the row if necessary (and I can remove it without problems), but didselectrowatindexpath is Never called.
I think is something involved that the tableview only keeps 10 rows at the same time. But in cellForRowAtIndex everything loads ok, for all rows. I keep all the data in some NSMutableArray, to access the data I need with [indexPath row].
I have already spend some time looking for similar post, but don't find anything like this.
any help will be appreciate. Thanks!
Some code:
// in .h
#import <UIKit/UIKit.h>
#import "PullRefreshTableViewController.h"
#import "DetalleMailViewController.h"
#interface MensajesTableViewController : PullRefreshTableViewController <DetalleMailViewControllerDelegate>
#property (nonatomic, strong) NSMutableArray *mailAuthors;
#property (nonatomic) int row_tabla_delete;
- (IBAction)presentMenu:(id)sender;
#end
//in .m make the synthesize of mailAuthors and some relevant code:
- (void)viewDidLoad
{
[super viewDidLoad];
self.tableView.allowsSelection = YES;
//This gesture works fine
UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc]
initWithTarget:self action:#selector(presentMenu:)];
lpgr.minimumPressDuration = 0.5; //seconds
lpgr.numberOfTouchesRequired =1;
lpgr.delegate = self;
[self.tableView addGestureRecognizer:lpgr];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *idCell = #"mailTableCell";
MailCell *celda = [tableView dequeueReusableCellWithIdentifier:idCell];
if(celda == nil){
celda = [[MailCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:idCell];
}
celda.mailAuthor.text = [self.mailAuthors objectAtIndex:[indexPath row]];
return celda;
}
-(void) viewWillAppear:(BOOL)animated{
[[self tableView] reloadData];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
//I really use a segue here, but for the sake of simplicity, I just put a trace, never called for rows 10, 20, 30... The segue works fine the rest of the time...
NSLog(#"tapped %d", [indexPath row]);
}
- (IBAction)presentMenu:(id)sender {
if ([sender state] == UIGestureRecognizerStateBegan){
CGPoint p = [sender locationInView:self.tableView];
NSIndexPath * indexPath = [self.tableView indexPathForRowAtPoint:p];
if (indexPath != nil){
self.row_tabla_delete = [indexPath row];
}
//some code to delete the row
}
}
In MailCell.hI have theUILabelfor mailAuthor as a property, and linked in the storyboard with the UILabel inside theUITableViewCell. In the storyboard, I have aTableViewController linked to my own class "MensajeTableViewController", theUITableViewCellto my "MailCell`".
If there is some need to add some other relevant code, or something else, please Help me.
Related
I'm writing an app hat has many views and I used sliding views library (ECSlidingViews). The problem is when I fill an array with objects and fill the table with the objects in tableView:cellForRowIndexPath: method, it does present the data in the table, but when I go to other view and come back the data disappears because tableView:cellForRowIndexPath: is not called. Here is the code:
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(#"begin of cellForRowAtIndexPath");
SchedualeCell *cell = (SchedualeCell *)[tableView dequeueReusableCellWithIdentifier:#"Cell"];
Course *temp = [array objectAtIndex:indexPath.row];
cell.nameLb.text = temp.name;
cell.hourLb.text = [NSString stringWithFormat:#"%d",temp.hour];
cell.startTimeLb.text = temp.startTime;
cell.endTimeLb.text = temp.endTime;
NSLog(#"End of cellForRowAtIndexPath");
return cell;
}
tableView:numberOfRowsInSection: and numberOfSectionsInTableView: is invoked when I come back to the view that has the table view.
P.S.: The view is UIViewController that has table view inside of it, and I searched all StackOverflow before posting my problem.
EDIT : this is where I set the delegate and datasource
- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(#"Did Appear");
// Do any additional setup after loading the view.
self.view.layer.shadowOpacity = 0.75f;
self.view.layer.shadowRadius = 10.0f;
self.view.layer.shadowColor= [UIColor blackColor].CGColor;
if (![self.slidingViewController.underLeftViewController isKindOfClass:[MenuViewController class]])
{
self.slidingViewController.underLeftViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"Menu"];
}
[self.view addGestureRecognizer:self.slidingViewController.panGesture];
if (array == nil)
{
array = [[NSMutableArray alloc]init];
}
table.delegate = self;
table.dataSource = self;
[table reloadData];
}
and I did included The delegate and datasource in the header
#interface MainViewController : UIViewController<UITableViewDataSource , UITableViewDelegate,addDelegate>
First of all , it's not numberOfRowsAtSection and numberOfTableView. It's numberOfSectionsInTableView and numberOfRowsInSection.
Things you can do :
1) NSLog your numberOfRowsInSection. Note that , If it's "0" then your cellForRowAtIndexPath is never going to be called.
2) If you are using your UITableView inside some UIView then you should add :
[self.view addSubview:table];
3) Don't Forget to include :
#interface yourViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>
Once check that you reframed the tableview in ViewWillAppear.
Some times if we set out of frame, CellForRowAtIndexPath will not call.
I have UITableView...when user tap on row, another screen is opened. The problem is, that sometimes, I tap once, but didSelectRowAtIndexPath calls several times. How to prevent that ?
The one case how to reproduce that situation is (you even can try to reproduce that on native iPhone settings):
Tap one row but do not release finger
SLIDE few next rows from left to right or from right to left (not just tap, you should slide) next few rows in different order by other hand
Release finger
You will see that blue selection is on several rows, and what screen will be opened is random
UPDATE:
In didSelectRow I just started new controller, where in viewDidLoad synchronization begin.
And if to reproduce my scenario step by step, than synch can be started several times
- (void)tableView:(UITableView *)tableView
didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
SecondViewController *secondViewController =
[SecondViewController alloc] init];
[self.navigationController
pushViewController:secondViewController animated:YES];
[secondViewController release];
}
Yes, I find the same situation.
Tap one row but do not release finger.
Keep pressing and moving the finger slightly until the row deselected.
Keep the first finger pressing, and tap the screen some times by another finger.
Release all fingers.
Then you can see didSelectRowAtIndexPath method called several times.
I created a new project for test it, and just used the following code. It was reproduced in every times.
So I think it is a bug of iOS SDK !
#import "SPViewController.h"
#interface SPViewController ()
#property (nonatomic, strong) UITableView *tableView;
#end
#implementation SPViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
self.tableView.delegate = self;
self.tableView.dataSource = self;
[self.view addSubview:self.tableView];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - UITableViewDataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return 30;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *cellIdentifier = #"cellIdentifier";
UITableViewCell *cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if(cell == nil){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
cell.textLabel.text = [NSString stringWithFormat:#"Test Cell %d", indexPath.row];
return cell;
}
#pragma mark - UITableViewDelegate
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
return 66;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
NSLog(#"%s %#", __FUNCTION__, indexPath);
}
#end
In my Map application I have segment controller on main screen and using that I have Map View & tableview(both are UIView). I have tried everything but my data is not loading in my tableview. Here is my tableview code. Here marker is attribute in my xml file which contain Showroom name and Iam able to parse this.
.h file
#interface HViewController : UIViewController<UITableViewDataSource, UITableViewDelegate> {
UITableView *_tableView;
}
#property (nonatomic, retain) IBOutlet UITableView *_tableView;
#end
.m file
Edited = with ViewWillAppear,viewDieLoad, segement action method
#synthesize tableView;
- (void)viewDidLoad {
appDelegate = (HAppDelegate *)[[UIApplication sharedApplication] delegate];
[segmentedControl addTarget:self action:#selector(segmentAction:)
forControlEvents:UIControlEventValueChanged];
}
- (void)viewWillAppear:(BOOL)animated
{
self._tableView.rowHeight = 80.0;
[_tableView reloadData];
}
-(void)segmentAction:(id)sender;{
UISegmentedControl* segCtl = sender ;
if( [segCtl selectedSegmentIndex] == 0 )
{
NSLog(#"segmentAction mapView");
mapView.hidden = NO;
_tableView.hidden = YES;
//[ self.view addSubview:mapView] ; // adding view to segmentindex 0
}
if( [segCtl selectedSegmentIndex] == 1 )
{
NSLog(#"segmentAction _tableview");
_tableView.hidden = NO;
mapView.hidden = YES;
//[ self.view addSubview:_tableview] ;
}
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
NSLog(#"appDelegate.markers _tableview");
return [appDelegate.markers count];
}
//method to print row(showroom count on Header)
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection: (NSInteger)section {
if(section == 0)
return [NSString stringWithFormat:NSLocalizedString(#"ShowRooms[%d]", #"Showroom format"), [appDelegate.markers count]];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath {
static NSUInteger const kShowroomNameLabelTag = 2;
UILabel *ShowroomNameLabel = nil;
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
cell.selectionStyle = UITableViewCellSelectionStyleGray;
ShowroomNameLabel = [[[UILabel alloc] initWithFrame:CGRectMake(50, 1, 300, 20)] autorelease];
ShowroomNameLabel.tag = kShowroomNameLabelTag;
ShowroomNameLabel.font = [UIFont boldSystemFontOfSize:18];
[cell.contentView addSubview:ShowroomNameLabel];
NSLog(#"UITableViewCell.markers _tableview");
}
else
{
ShowroomNameLabel = (UILabel *)[cell.contentView viewWithTag:kShowroomNameLabelTag];
}
marker *aMarker = [appDelegate.markers objectAtIndex:indexPath.row];
//ShowroomNameLabel.text = aMarker.name;
ShowroomNameLabel.text= [NSString stringWithFormat:#"ShowroomName= %#", aMarker.name];
return cell;
}
In my tableview Header it shows data count correctly but not showing data.
I have connected delegate,datasource,_tableview to fileOwner of the HViewController in which I have put above code. Plz suggest something where I am wrong. I am parsing XML file and getting data in console alos I can show it on Map. But I am not able to load data in my tableview.
Try moving [_tableView reloadData] to viewWillAppear.
UITableViewController reloads the table view's data in viewWillAppear, not viewDidLoad. I can't tell you the exact reason for which this would make a difference, though I can think of several. Anyway, it's worth a try.
EDIT:
RESPONSE TO COMMENTS
If titleForHeaderInSection: is being called, then there is a data source connected to a table view. So, the problem is not a lack of a data source connection.
I am guessing you have 2 table views in your .xib file: a large one & a short one below it. The large table view is not connected to the data source, so it just displays blank lines. The short table view is connected to the data source. But, it is just tall enough for a header and has no space left to display any cells. Thus, titleForHeaderInSection: is called, but cellForRowAtIndexPath: is not because there is no space to display any cells.
Note that this is just a guess, but it is the only scenario I can think of that would cause the behavior you described. The code you posted looks ok, although a bit more complicated than necessary.
There is no question that reloadData should be in viewWillAppear. That's where the Apple engineers put it when they created the UITableViewController class. So, to put it elsewhere, you have to believe you know better than they do.
Im having a little issue with using more than 1 UITableView on a view.
Here's what I've done so far (using examples, etc from here and other places):
Created a class for each table. Each class is pretty basic:
.h:
#interface ConstructionDocumentsJobTable : UITableViewController <UITableViewDataSource, UITableViewDelegate> {
NSMutableArray *tableItems;
IBOutlet UITableView *itemsTable;
NSInteger recordSelected;
id <JobTableSelectionDelegate> tableSelectDelegate;
}
#property (nonatomic, retain) NSMutableArray *tableItems;
#property (nonatomic, assign) id <JobTableSelectionDelegate> tableSelectDelegate;
#end
.m:
#implementation ConstructionDocumentsJobTable
#synthesize tableItems, tableSelectDelegate;
#pragma mark -
#pragma mark View Life Cycle
-(void) loadView
{
}
-(void) dealloc
{
[tableItems release];
[super dealloc];
}
#pragma mark -
#pragma mark Table view data source
// 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 [tableItems count];
}
// 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];
}
cell.textLabel.text = [tableItems objectAtIndex:indexPath.row];
return cell;
}
#pragma mark -
#pragma mark Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
//pass the tap value back to the delegate
}
Both are completely identical, save the names.
When Im making the call to the first one, it is called in the ViewDidLoad method of the controller of the view. It's pretty basic:
NSMutableArray *tableItems = [[NSMutableArray alloc] initWithCapacity:intMax];
//strDocumentType is set elsewhere and loaded here
if(strDocumentType == #"typea"){
[tableItems addObject:#"Type A - Value 1"];
[tableItems addObject:#"Type A - Value 2"];
}
else {
[tableItems addObject:#"Type B - Value 1"];
}
if(jobTableController == nil){
jobTableController = [[ConstructionDocumentsJobTable alloc] init];
[jobTableController loadView];
jobTableController.tableItems = tableItems;
jobTableController.tableSelectDelegate = self;
}
[tableJobList setDataSource:jobTableController];
[tableJobList setDelegate:jobTableController];
jobTableController.view = jobTableController.tableView;
The second table is built when a cell in the first table is selected. So, in the first tables selection method, the delegate is called back from the parent controller, which then has this:
NSMutableArray *tableTypeItems = [[NSMutableArray alloc] initWithCapacity:100];
if(tableSelect == #"plumbing"){
[tableTypeItems addObject:#"Something"];
[tableTypeItems addObject:#"Other"];
}
if(typeTableController == nil){
typeTableController = [[ConstructionDocumentsTypeTable alloc] init];
[typeTableController loadView];
typeTableController.tableItems = tableTypeItems;
typeTableController.tableSelectDelegate = self;
}
[tableTypeList setDataSource:typeTableController];
[tableTypeList setDelegate:typeTableController];
typeTableController.view = typeTableController.tableView;
[typeTableController.tableView reloadData];
//Code to move the first table off the screen and move this one into view goes here
Ive been stuck on this for days, and I really need to get this done!!!
Im sure it's something REALLLLLLY simple.
Any help you guys can pass along would be HUGELY appreciated.
Thanks everyone.
Your only defining itemsTable in your header, try defining another table, and in your cellForRowAtIndexPath try this:
if(itemsTable1){
/* stuff for first table */
} else {
/* stuff for second table */
}
And do the same for each UITableVIew Delegate
For performance sake it is usual to reuse UITableView' cells.
Is there a way to do the same thing with TableView header' views?
I am talking about the ones that are returned with delegate's method:
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
I tried to do the following which doesn't seem to be working as expected:
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
static NSString *CellIdentifier = #"Header";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: CellIdentifier];
if (cell == nil) {
cell = [self getHeaderContentView: CellIdentifier];
}
return cell;
}
Is there a way to reuse header' views?
The reason Apple built in the ability to reuse tableview cells is because while the tableview may have many rows, only a handful are displayed on screen. Instead of allocating memory for each cell, applications can reuse already existing cells and reconfigure them as necessary.
First off, header views are just UIViews, and while UITableViewCell is a subclass of UIView, they are not intended to be placed as the view of a section header.
Further, since you generally will have far fewer section headers than total rows, there's little reason to build a reusability mechanism and in fact Apple has not implemented one for generic UIViews.
Note that if you are just setting a label to the header, you can use -(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section instead.
For something more custom, such as a label with red text (or a button, image, etc), you can do something like this:
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
UIView *headerView = [[[UIView alloc] initWithFrame:CGRectMake(0,0, 320, 44)] autorelease];
UILabel *label = [[[UILabel alloc] initWithFrame:headerView.frame] autorelease];
label.textColor = [UIColor redColor];
label.text = [NSString stringWithFormat:#"Section %i", section];
[headerView addSubview:label];
return headerView;
}
You can implement that by creating UITableViewHeaderFooterView class
it is subclass of UIView
You also need to create an individual XIB as it will not be created automatically with UITableViewHeaderFooterView creation.
Register Nib with tableview
[self.tblCart registerNib:[UINib nibWithNibName:#"CartHeaderView" bundle:nil] forHeaderFooterViewReuseIdentifier:#"CartHeader"];
Now You can Access that in viewForHeaderInSection
-(UIView *) tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
CartHeaderView *sectionHeader=[tableView dequeueReusableHeaderFooterViewWithIdentifier:#"CartHeader"];
return sectionHeader;
}
Note :
To set background color you will need to create a subview with same frame as section header and set color for that view.
you can follow
Changing the background color on a UITableViewHeaderFooterView loaded from a xib says to use contentView.backgroundColor instead
A simple yet effective solution:
#interface SectionedTableViewController ()
#property (nonatomic, strong) UINib* sectionHeaderNib;
#property (nonatomic, strong) NSMutableArray* sectionHeaders;
#end
#implementation SectionedTableViewController
#synthesize sectionHeaderNib = sectionHeaderNib_;
#synthesize sectionHeaders = sectionHeaders_;
- (void) viewDidUnload
{
self.sectionHeaders = nil;
[super viewDidUnload];
}
- (NSMutableArray*) sectionHeaders
{
if (!sectionHeaders_)
self.sectionHeaders = [NSMutableArray array];
return sectionHeaders_;
}
- (UINib*) sectionHeaderNib
{
if (!sectionHeaderNib_)
self.sectionHeaderNib = [UINib nibWithNibName: NSStringFromClass(YourHeaderView.class) bundle: nil];
return sectionHeaderNib_;
}
- (YourHeaderView*) dequeueHeader
{
return [self.sectionHeaders firstObjectPassingTest: ^(id obj) { return (BOOL) ([obj superview] == nil); }];
}
- (NSString*) sectionHeaderTitleForSection: (NSInteger) section
{
return nil;
}
- (UIView*) tableView: (UITableView*) tableView viewForHeaderInSection: (NSInteger) section
{
YourHeaderView* headerView = [self dequeueHeader];
if (!headerView)
{
headerView = [YourHeaderView instanceFromNib: self.sectionHeaderNib];
[self.sectionHeaders addObject: headerView];
}
return headerView;
}
#end