Quote:
Originally Posted by brush51
Hello @all,
i want to make a next and previous function in my DetailView. The DetailView appears when i click a TableView's cell, didSelectRowAtIndexPath:.
I have created a method for calling the detailView and this method is called in didSelectRowAtIndexPath:
Code:
//DashboardViewController.h
- (void) detailViewAufruf:(id) sender;
//DashboardViewController.m
- (void) detailViewAufruf:(id) sender {
NSLog(@"selectedDetail: %@", selectedDetail);
//present and release controller
if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailViewController_iPad" bundle:[NSBundle mainBundle]];
detailViewController.selectedDetail = [[NSArray alloc] init];
detailViewController.selectedCardTitle2 = [[NSArray alloc] init];
detailViewController.selectedDetail = [selectedDetail valueForKey:@"cardText"];
detailViewController.selectedCardTitle2 = [selectedCardTitle valueForKey:@"cardTitle"];
detailViewController.selectedRow2 = [self.tableViews indexPathForSelectedRow];
detailViewController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[dashboardViewController_iPad presentModalViewController:detailViewController animated:YES];
[detailViewController release];
} else {
detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailViewController_iPhone" bundle:[NSBundle mainBundle]];
detailViewController.selectedDetail = [[NSArray alloc] init];
detailViewController.selectedCardTitle2 = [[NSArray alloc] init];
detailViewController.selectedDetail = [selectedDetail valueForKey:@"cardText"];
detailViewController.selectedCardTitle2 = [selectedCardTitle valueForKey:@"cardTitle"];
detailViewController.selectedRow2 = [self.tableViews indexPathForSelectedRow];
detailViewController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[dashboardViewController_iPad presentModalViewController:detailViewController animated:YES];
[detailViewController release];
}
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
selectedDetail = [[NSArray alloc] initWithObjects:[[self fetchedResultsController] objectAtIndexPath:indexPath], nil];
selectedCardTitle = [[NSArray alloc] initWithObjects:[[self fetchedResultsController] objectAtIndexPath:indexPath], nil];
[self detailViewAufruf:indexPath];
}
At next, i want to jump to the next cell, when i am in detailView and press the nextCell button:
Code:
//DetailViewController.m
- (IBAction) previousCard:(id) sender {
NSLog(@"previousBtn");
DashboardViewController *parent = (DashboardViewController *)self.parentViewController;
NSLog(@"parent: %@", parent); //Log == parent: <UIViewController: 0x4e99ee0>
NSIndexPath *actualIndexPath = selectedRow2;
NSIndexPath * newIndexPath = [NSIndexPath indexPathForRow:actualIndexPath.row-1 inSection:actualIndexPath.section];
//[parent.tableViews selectRowAtIndexPath:newIndexPath animated:YES scrollPosition:UITableViewScrollPositionMiddle];
if([parent.view.subviews objectAtIndex:0]) {
UIView * subview = (UIView *) [parent.view.subviews objectAtIndex:0];
UITableView *tView = (UITableView *) subview;
//NSLog(@"tView.delegate: %@", tView.delegate);
/*
[tView selectRowAtIndexPath:newIndexPath animated:YES scrollPosition:UITableViewScrollPositionMiddle];
[tView.delegate tableView:tView didSelectRowAtIndexPath:newIndexPath];
//[tView.delegate tableView:tView didSelectRowAtIndexPath:newIndexPath];
*/
[self.detailViewController detailViewAufruf:sender];
}
}
And if i click to the next cell iam getting an error:
[UIViewController detailViewAufruf:]: unrecognized selector sent to instance 0x5958460
Whats wrong here, can someone help me out?
Thanks,
brush51 |
A number of things are wrong.
Your DashboardViewController class is the class with the table view, right? It has a method detailViewAufruf that is supposed to create and push a detail view controller, passing in the data you want the detail view controller to display.
You say that method is called by didSelectRowAtIndexPath.
In your detailViewAufruf method, you're allocating a pair of empty arrays and assigning them to the detail view controller's selectedDetail and selectedCardTitle2 properties. However, you then assign different values to selectedDetail and selectedCardTitle2. As a result, you leak the empty NSArrays that you assign to those properties a few lines before. Get rid of those first lines that create empty arrays and assign them. There is no point, and it causes a leak.
Your detailViewAufruf method looks like it uses a instance variable selectedDetail to get to the data that you are supposed to pass to the detail controller. However, you also ask your table view for it's selected index path.
Further down, in your detail view controller, you try to call the detailViewAufruf method as if it's a method of the detail view controller, but it is actually a method if your DashboardViewController.
How is your data for the entries in the table view stored? Do you have an array of data objects, one for each entry in the table view?
If you don't, you should. Imagine this:
You create an array of dictionaries, one for each table view entry. Each dictionary contains all the data for that entry.
Make the array of data dictionaries a property of your DashboardViewController, let's call that property dataArray.
Add an integer property indexToDisplay to your detail view controller. Also add a property dataDelegate to the detail view controller. That property would be of type DashboardViewController. (or better yet, create a DashboardDataProtocol, and make the dataDelegate a property of class (id) <DashboardDataProtocol>. That might be a little beyond you, however.)
When the user selects a cell from the table view, you write a didSelectRowAtIndexPath: method that looks something like this:
- (void)tableView
UITableView *)tableView didSelectRowAtIndexPath
NSIndexPath *)indexPath
{
NSInteger row = [indexPath row];
detailViewController =
[[DetailViewController alloc] initWithNibName: @"DetailViewController_iPad"
bundle:[NSBundle mainBundle]];
detailViewController.indexToDisplay = row;
detailViewController.dataDelegate = self;
[dashboardViewController_iPad presentModalViewController:detailViewController animated:YES];
}
The property "indexToDisplay" would tell the detail view controller which item to display. Then it's viewWillAppear method would call a displayNewDataForRow: method to copy that data to the appropriate places in it's view. That method would use the dataDelegate property to ask the DashboardViewController for the dataArray, get the data for the specified index, and display it.
Now, if you write a nextButton method, that method would increment the row count and call the displayNewDataForRow method on the new row number.
next/previous function in detailView of TableView
Linear Mode
