I've got UITableViewController and the body of the tableView:didSelectRowAtIndexPath: method is following:
if (indexPath.row == 0) {
MyViewController *myViewController = [[MyViewController alloc] initWithNibName:#"MyViewController" bundle:nil];
[self.navigationController pushViewController:myViewController animated:NO];
[myViewController release];
}
[tableView deselectRowAtIndexPath:indexPath animated:YES];
Unfortunately when I select the first row in the table view then my view in not displayed. When I debug I can see that it goes into the if statement, view controller is initialized and pushed onto the stack, but the view does not appear.
Any ideas?
Thanks!
Sounds like the MyViewController.xib is not wired up correctly. Make sure that "File Owner" is set to the correct class and that it's view property connects to the view.
-pushViewController:animated: loads the view of the viewController provided to it but if there is no view it doesn't complain.
Related
I am having an app which has a UITableViewController which is my settings page. I am pushing the UITableViewController with a presentModalViewController using self.navigationController (using storyboard ID). however each time I try to see that page, it's showing exception. After reading few posts I tried implementing two methods
- (NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)section
{
return 3;
}
- (UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [super tableView:tableView
cellForRowAtIndexPath:indexPath];
return cell;
}
**my .h File**
#interface Setting : UITableViewController<UITableViewDelegate,UITableViewDataSource>
I have done all UI settings in IB so I didn't change anything in above two implemented methods.
In mainviewcontroller from where I am pushing the view to UITableViewController, I am using the below code
Setting *nextController = [[self storyboard] instantiateViewControllerWithIdentifier:#"setting"];
[self presentModalViewController:nextController animated:YES];
Setting *dvc = [[Setting alloc] init];
[self.navigationController pushViewController:dvc animated:YES];
As I already set all UIs in IB why do I need to implement those methods? At least I can seen the view correctly.
It looks like you're trying to initialize the same viewController twice. You don't need to alloc] init] after you instantiateViewControllerWithIdentifier. At least, from my experience you don't. Try this:
Setting *nextController = [[self storyboard] instantiateViewControllerWithIdentifier:#"setting"];
[self.navigationController pushViewController:nextController animated:YES];
That will "push" the nextController with the storyBoardID of "setting" from the right into your existing NavigationController.
However, using my intuition, I believe you want to present a settings view modally, that has it's own NavigationController. In that case, try this code, which wraps the Settings ViewController into a NavigationController, and presents that whole thing modally, so you can navigate within settings:
Setting *nextController = [self.storyboard instantiateViewControllerWithIdentifier:#"setting"];
UINavigationController *navcont = [[UINavigationController alloc] initWithRootViewController:nextController];
navcont.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentViewController:navcont animated:YES completion:nil];
Alternatively, you could do all of this in the Storyboard itself. Select your settings view controller, and go to Editor Menu > Embed In... > Navigation Controller. Then make a segue from your button to the navigation controller that holds the settings controller. Set the segue to "Modal" and you're all done.
I have this design in my storyboard:
As you see the middle ViewController is connected to a Navigation Controller ( I just made the navigation bar invisible). In this middle page I add all the controls programmatically ( using Parse mobile platform login wizard ).
The thing is I want to navigate to the third page, when Login is done successfully.
- (void)logInViewController:(PFLogInViewController *)logInController didLogInUser:(PFUser *)user {
[self dismissModalViewControllerAnimated:YES];
ViewController2 *viewController = [[[ViewController2 alloc] init] autorelease];
[self.navigationController pushViewController:viewController animated:YES];
printf("%s", [#"Ali" UTF8String]);
}
the message will be printed, but the navigation is failed. Can you help? Perhaps I need to fix something in storyboard.
I'm not sure you should be sending the dismissModalViewControllerAnimated: message. Are you presenting another view controller modally on top of your login view controller?
Anyway, when you have configured a view controller in a storyboard, you can't create the view controller using alloc and init. You need to ask the storyboard to create it. There are a couple of ways to do this.
One way
One way to get the storyboard to create your ViewController2 is to make a push segue in your storyboard.
Open your storyboard.
Control-drag from the login view controller to the ViewController2.
Choose the “push” segue type.
Click on the segue.
Choose View > Utilities > Show Attributes Inspector.
In the Attributes Inspector (right-hand side of the window), set the segue identifier to “didLogIn”.
To execute the segue, do this:
- (void)logInViewController:(PFLogInViewController *)logInController didLogInUser:(PFUser *)user {
[self dismissModalViewControllerAnimated:YES];
[self performSegueWithIdentifier:#"didLogIn" sender:self];
}
Another way
Another way to get the storyboard to create your ViewController2 is to give it a storyboard ID and ask the storyboard to instantiate the view controller by ID. Then you can push the view controller.
Before you can ask the storyboard to create it, you must give a “storyboard ID” to the ViewController2 instance in your storyboard.
Open your storyboard.
Select the ViewController2 instance.
Choose View > Utilities > Show Identity Inspector.
In the Identity Inspector (right-hand side of the window), enter “viewController2”. Case is important!
Then, in your code, ask the storyboard to instantiate viewController2:
- (void)logInViewController:(PFLogInViewController *)logInController didLogInUser:(PFUser *)user {
[self dismissModalViewControllerAnimated:YES]; // Should this be here?
ViewController2 *viewController = [[[ViewController2 alloc] init] autorelease];
[self.navigationController pushViewController:viewController animated:YES];
}
Try this way,
ViewController2 *myViewController=[storyboard instantiateViewControllerWithIdentifier:#"TheNameOfYourController"]
[self.navigationController pushViewController:myViewController animated:YES];
Because a lot of relevant code/settings is missing I would suggest the following:
Use this code:
-(void)logInViewController:(PFLogInViewController *)logInController didLogInUser:(PFUser *)user {
[self dismissViewControllerAnimated:YES completion:NULL];
Class klass = [[NSBundle mainBundle] classNamed:#"ViewController2"];
ViewController2 *viewController = [[klass alloc] init];
[self.navigationController pushViewController:viewController animated:YES];
[viewController release];
NSLog("%#", #"Ali");
}
If that doesn't work check how you suppose to initialize ViewController2.
If all this doesn't help please try to post more relevant code.
To move next viewController using Storyboard Identifier
nextViewController *objnextViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"nextViewControllerIdentifier"];
[self.navigationController pushViewController: objnextViewController animated:YES];
I'm building an iPhone app, with the following structure:
I have the MainViewController which consists of 2 views (like split screen).
The first view of them, has a button. On tap, a UItableView (ResultTableViewController) appears in the second (of the above) view:
-(IBAction)buttonTapped:(id)sender {
if ([(UIButton *)sender tag] == 0) {
ResultsTableViewController *childViewController = [[ResultsTableViewController alloc] init];
childViewController.tableView.delegate = self.results;
[self.results.view addSubview:childViewController.tableView];
}
}
So I have a UItableView as a sub-view of a UIView.
The problem is that pushViewController() in didSelectRowAtIndexPath() of ResultTableViewController does not work (self.navigationController is nil).
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
DetailsViewController *detailView = [[DetailsViewController alloc] initWithNibName:#"DetailsViewController" bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:self.detailView animated:YES];
}
I have tried many of the solutions I found, but nothing works.
In my MainWindow.xib, I have only MainViewController added, is that the problem?
Thanks in advance!
You are adding the view of the child controller to your controller's view, not pushing the child controller onto your navigation stack. Due to that, your child controller's navigation controller will be nil, since it wasn't put into the navigation controller.
Is this what you're going for?
-(IBAction)buttonTapped:(id)sender {
if ([(UIButton *)sender tag] == 0) {
ResultsTableViewController *childViewController = [[ResultsTableViewController alloc] init];
childViewController.tableView.delegate = self.results;
[self.navigationController pushViewController:childViewController animated:YES];
}
}
[self.navigationController pushViewController:self.detailView animated:YES];
above line of code will push the detailview on navigationcontroller stack. Check whethere your tableviewcontroller is on that stack ?
Ok, I found it.
I had to declare my MainViewController as UINavigationControllerDelegate and create a secondary NavigationController in it. I push the viewController in my new navigationController and that's it.
I have an iPad app that uses the storyboard board feature and then I have a separate .xib file for another view. I can switch to the separate view and its fine:
-(IBAction)SecondView:(id)sender{
SecondView *Second = [[SecondView alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:Second animated:NO];
}
But when I am in the Second View and try going back I do everything the same just with the first view controller, but It just goes to a black screen:
-(IBAction)FirstView:(id)sender{
FirstView *First = [[FirstView alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:First animated:NO];
}
What do you guys think? Am I doing something wrong? What is the best way to switch views?
initWithNibName:bundle is for loading nib or xib files.
If you are loading from a storyboard, you need to use
FirstView *First= [self.storyboard instantiateViewControllerWithIdentifier:#"IDENTIFIER"];
IDENTIFIER is defined in your storyboard, it's in the Utilities, Attributes Inspector on the right side.
HOWEVER your real problem is that you shouldn't be loading from the storyboard at all. you should just be calling
[self dismissModalViewControllerAnimated:YES];
That call will clean up the presentModalViewController:animated: that you used to put the modal view controller up in the first place.
You presented SecondView using presentModalViewController:animated:, so you need to dismiss it using dismissModalViewControllerAnimated:.
- (IBAction)FirstView:(id)sender
{
[self dismissModalViewControllerAnimated:YES];
}
I have an UIViewController, this controller is contained in a navigationController.
I add an UITableViewController in this viewController. I would like to call a pushViewController method when I press on a cell of my tableView.
I tried this :
UITableViewController
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
FirstView *myViewController = [[FirstView alloc] init];
[f myViewController];
}
UIViewController (FirstView)
-(void)pushIt
{
SecondView *sCont = [[SecondView alloc] initWithNibName:#"SecondView" bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:sCont animated:YES];
NSLog(#"didSelect"); // is printed
[sCont release];
sCont = nil;
}
But nothing happen. I put NSLog() to my pushIt method and I can see it. So I don't understand why I can't push it.
Any idea?
UIViewController has a property named navigationController that will return a UINavigationController if one exists for the view controller its called from.
Using this property, you can push view controllers onto the navigation stack from your table view's didSelectRowAtIndexPath: method.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
SecondView *sCont = [[SecondView alloc] initWithNibName:#"SecondView" bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:sCont animated:YES];
[sCont release];
}
The reason your current code isn't working is probably because of the following:
You already have an instance of FirstViewController, as you said you have added a table view as its subview
You try and create a new instance of a FirstViewController when the user taps a cell, which isn't on the navigation stack, so trying to push a view controller onto the stack from there doesn't work, because the navigationController property returns nil.
You alloc and init myViewController but never push it to navigation or window or whatever else, then you push sCont to myViewController, that isn't present at window. First, try not using myViewController, next try to push myViewController to navigation before pushing sCont into it.