i m parsing json data and populating the tableview and making some validation with the incoming json data..everthing works fine.i made the code such that when the last table view row is clicked it got to open a modal view controller.when clicked .i m getting this error [tableiew1] Unrecognised selector send at the instance...could u guys help me out below is the code.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Navigation logic may go here. Create and push another view controller.
if (indexPath.row == 5) {
if (self.dvController6 == nil)
{
Vad_tycker *temp = [[Vad_tycker alloc] initWithNibName:#"Vad_tycker" bundle:[NSBundle mainBundle]];
self.dvController6 = temp;
[temp release];
}
[self presentModalViewController:self.dvController6 animated:YES];
}
}
Seems like you have forgotten to provide the access for the tableView1 in Vad_tycker.
Or You should do a crosscheck whether you have assigned the correct instance in tableView delegate's and also make sure to provide the implementation for the method of delegate's in their respect target classes.
I think you forgot to connect the tableView Datasource and Delegate methods in the vad_tycker controller.
Also check that the instance of UITableView i.e. in your case tableView1 is also connected with the TableView. on the view.
Thanks
Related
I got a big app containing a lot of dependencies. For this case I implemented a class called RootTableViewController to handle all the stuff that has to be done everytime a table view controller is required.
Now I discovered an endless loop and I dont know how to fix it. I got the following code in RootTableViewController:
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
NSString *sectionTitle = [self tableView:tableView titleForHeaderInSection:section];
int numbersOfRowInSection = [self.tableView numberOfRowsInSection:section];
if (numbersOfRowInSection > 0)
{
// ...
}
else
{
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 28.0f)];
return view;
}
}
This works perfect on iOS 5 and iOS 6, but on iOS4 it causes an endless loop, because [tableView numberOfRowsInSection] is calling [tableView viewForHeaderInSection]. How can I fix this using the table view api? Its no solution for me to work with the [ count] of internal data arrays because I got a lot of table view controllers extending this RootTableViewController with different data sources.
This is simply not good style. You are supposed to subclass or rahter implement the related delegate method but you shoudl not call UITableView.numberofRowsInSection:
However, you have certainly implemented tableView:numberOfRowsInSection. Move all of its functionality to the new method myNumberOfRowsInSection: In there do the same. It is mainly a copy of your current numberOfRowsInSection.
Then here in your code sniplet call [self myNumberOfRowsInSection:...];
And within tableView:numberOfRowsInSection:section just do:
return [self myNumberOfRowsInSection:section];
Apply the same pattern to all delegate methods that you may want to call yourself. Move all its business logic into your own method and then only call your own method from the delegate method and from your own code.
If you want to get the number of rows in a section of the data source without accessing the internal data array, you could query the dataSource delegate for it, something like
int numbersOfRowInSection = [self.tableView.dataSource tableView:self.tableView numberOfRowsInSection:section];
(not compiler checked)
Can someone tell me how to assign a interface to a table view element, using storyboards? I'm making a medical calculator that has different calculators for every equation, and I need help making code that points a element to push to another interface. This is because for every equation, there are different fields to fill out (such as age, oxygen levels, whether someone has diabetes or not, height, etc.) Not every equation needs the same fields.
I have tried doing this:
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Deselect row
[tableView deselectRowAtIndexPath:indexPath animated:YES];
// Declare the view controller
UIViewController *anotherVC = nil;
// Determine the row/section on the tapped cell
switch (indexPath.section) {
case 0:
switch (indexPath.row) {
case 0: {
// initialize and allocate a specific view controller for section 0 row 0
anotherVC = [[BmiViewController alloc] init];
break;
}
case 1: {
// initialize and allocate a specific view controller for section 0 row 1
/anotherVC = [[AaOxygenGradientViewController alloc] init];
break;
}
}
break;
}
}
But after doing this, it refers back to what was originally in the storyboard document (which is empty because I have created the interface programmicatally), instead of showing my test alert popup.
Also, is it possible to maybe make a bunch of table view cells, then have every one segue to every other view controller in the storyboard?
Thanks a lot in advance!
First, you are running deselectCellAtIndexPath? What is the reason for this? If you are just trying to remove the blue highlight then it's better to change the UITableViewCellSelectionStyle (or something like this) of the cell.
I'm not sure what you're asking for the first part but for the segue part then yes.
In Storyboard set up the segues from the tableViewController to each other VC that you want to segue to and give them all sensible identifiers.
i.e. medicalCalulatorSegue
graphSegue
userDetailsSegue
etc...
Then in your didSelect method you will have something like...
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
//some stuff...
switch(indexPath.row) {
case 0:
[self performSegueWithIdentifier:#"medicalCalulatorSegue"];
break;
case 1:
[self performSegueWithIdentifier:#"graphSegue"];
break;
case 2:
[self performSegueWithIdentifier:#"userDetailsSegue"];
break;
}
}
This will then segue to each of the different view controllers depending on which cell is selected.
The reason for not deselcting the cell is that in your method prepareForSegue you can then still access the indexPath of the selected cell...
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
I am trying to build a multilayer xmlparser which shows data in a tableview and switches to the next view based on the selected row (most likely to the same viewcontroller).
I started with storyboard segues but as i am using dynamic cells i dont know how to create more than one push segue (because it needs to push to various viewcontrollers). So i kept the storyboard views, deleted all the segues and used the code below instead.
however it throws this exception when the new view tries to pupulate the row:
Terminating app due to uncaught exception
'NSInternalInconsistencyException', reason: 'UITableView dataSource
must return a cell from tableView:cellForRowAtIndexPath:'
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(#"index: %i", indexPath.row);
switch (indexPath.row) {
case 0:
{
DetailViewController *detailViewController = [DetailViewController alloc];
[self.navigationController pushViewController:detailViewController animated:YES];
break;
}
//...
default:
{
LayerViewController *layerViewController= [LayerViewController alloc];
[layerViewController setStartUpWithIndex:indexPath.row andLayer:layercount];
[self.navigationController pushViewController:layerViewController animated:YES];
break;
}
}
}
setStartUpWithIndex:andLayer: is my init method...
the problem does not occur when im pushing via storyboard segue with the following segue code:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
[[segue destinationViewController] setStartUpWithIndex:indexPath.row andLayer:layercount];
}
i think i am missing something the "segue" method does which i need to include in my didSelectRowAtIndexPath as cellForRowAtIndexPath: works fine in the first layer of the view.
requested edit:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"LayerCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
cell.textLabel.text = [[articles objectAtIndex:indexPath.row]objectForKey:#"HerstellerName"];
// cell.textLabel.text = #"ololol";
return cell;
}
the articles array is working btw
You aren't creating any cells. I don't know why Apple didn't include this in the default implementation, but after:
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
You need to add:
if (cell==nil){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
Otherwise you're just relying on dequeued cells which won't exist when the tableView loads.
Edit: And if you're not using ARC, you need to wrap that alloc method with an autorelease.
You are pushing another viewController to be viewed and this next viewController has no dataSource methods implemented. This what happened.
As far as I understood, you are trying to present an xml node with a table in the way that each table row consist child nodes of presented node. selecting row with chld node gets you to next table view which presents table with child nodes of selected node.
IMO you may need only one view controller to present current xml node, which changes only data to be presented in a table and reloads the table again. So no pushing view controllers is needed. You can use then method
– reloadRowsAtIndexPaths:withRowAnimation:
for all the nodes in the table, setting animation similar to changing view controller (aka sliding old table left)
I'm new to using the split view for creating iPad applications. When I first create the project just using the standard MasterDetail Application template (Xcode 4.2), it creates a MasterViewController and a DetailViewController. The template has the following method that is called when a row is selected from the popover table (master detail view controller):
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
if (!self.detailViewController)
{
self.detailViewController = [[DetailViewController alloc] initWithNibName:#"DetailViewController" bundle:nil];
}
[self.navigationController pushViewController:self.detailViewController animated:YES];
Now I understand when you are using a regular navigation controller if you are programing for an iPhone you just do this type of thing to push on another view controller on to the stack. However, with this template, it just pushes the detail view onto the popover rather than updating what is already present. I'm confused as what I need to update to select something from the pop over (master detail view), and then have the detailView update.
Update:
To try and test out the "detailItem" that is already setup for you in the DetailViewController, I commented out the pushViewController and added the following:
//[self.navigationController pushViewController:self.detailViewController animated:YES];
self.detailViewController.detailItem = #"Test";
// setter in detailViewController
- (void)setDetailItem:(id)newDetailItem
{
if (_detailItem != newDetailItem) {
_detailItem = newDetailItem;
// Update the view.
[self configureView];
}
if (self.masterPopoverController != nil) {
[self.masterPopoverController dismissPopoverAnimated:YES];
}
}
- (void)configureView
{
// Update the user interface for the detail item.
// detailDescriptionLabel.text is a IBOutlet to the label on the detailView
if (self.detailItem) {
self.detailDescriptionLabel.text = [self.detailItem description];
}
}
According to this code, the text of the label on the detailViewController should be updated. However, when I do click on the item in the master view controller table, nothing happens.
There are a couple different ways you could do it. First off, like you said, remove the pushViewController call (I don't know why Apple's template does this... maybe just to show you you can?).
Next, let your MasterViewController know about the DetailViewController that is already displayed. I usually set master.detailViewController = detailViewController in the appDelegate.
Remember, the DetailViewController is already being displayed, so you won't always need to realloc it (unless you are replacing it with some other view)
First Option
Use delegate calls to set the information. Declare a protocol to pass information to the detailView and have it display it appropriately. Here is a tutorial describing this in more detail.
Second Option
Pass DetailViewController some data & override the setter to refresh the detailView. Here is a tutorial describing this in more detail.
// in DetailViewController
- (void)setDetailItem:(id)newDetailItem {
if (detailItem != newDetailItem) {
[detailItem release];
detailItem = [newDetailItem retain];
// Update the view.
navigationBar.topItem.title = detailItem;
NSString * imageName = [NSString stringWithFormat:#"%#.png",detailItem];
[self.fruitImageView setImage:[UIImage imageNamed:imageName]];
}
}
Edit: Just looked at the template again, and setDetailItem type code is already in there, but the code is creating a completely new detailView so the detailView that is viewable on the splitViewController is not changed at all.
At the moment, I have an iOS app that starts out with a NavigationView (root view) and a table contained in the root view below the navigation bar. I am attempting to load another view (hoping to make it another table) from a .nib file when the first row in the original table is selected. How can I do this?
Any help or advice would be appreciated. Thank you very much.
You need to make use of the UITableViewDelegate method, tableView:didSelectRowAtIndexPath:
Ensure that your tableview's delegate is set to your view controller inside Interface Builder, or if you are not using interface builder..
[tableView setDelegate:self];
Your view controller will then adopt the UITableViewDelegate protocol and respond to tableView:didSelectRowAtIndexPath: when a row is selected.
Loading your new view when the first row is selected will be implemented like so..
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if(indexPath.section == 0){ // the first row
MyView *myView = [[MyView alloc] init];
[self.navigationController pushViewController:myView animated:YES];
[myView release];
}
}