Basically, i'm using the prepareForSegue method to transition to another view within my storyboard, my view had to be embedded in a navigation controller in order to display the navigation bar so I am passing variables in such a way:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if([segue.identifier isEqualToString:#"exploreAddSelected"]){
UINavigationController *navController = (UINavigationController *)segue.destinationViewController;
AddTableViewController *controller = (AddTableViewController *)navController.topViewController;
controller.tagName = tagName;
}
}
My issue is I need to be able to set some method values in the actual view controller when using the prepareForSegue method, as you can do when using pushViewController as below:
DetailViewController *detailViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"DetailViewController"];
detailViewController.tagName = tagName;
[detailViewController setCurrentHashtag:nil];
[navigationController pushViewController:self.detailViewController animated:YES];
I need to be able to set the "setCurrentHashtag" method, that is declared in the view controller that the segue "exploreAddSelected" goes to. How would I do this?
The answer to this is actually extremely obvious, but it takes me to ask the question to realise the answer myself.
You can simply set:
controller.currentHashtag = nil;
Where currentHashtag is a newly declared instance in the view controller.
Then in the actual view controller set:
[self setCurrentHashtag:currentHashtag];
Just add the currentHashtag to the method.
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if([segue.identifier isEqualToString:#"exploreAddSelected"]){
UINavigationController *navController = (UINavigationController *)segue.destinationViewController;
AddTableViewController *controller = (AddTableViewController *)navController.topViewController;
controller.tagName = tagName;
[controller setCurrentHashTag:nil]; //add this line
}
}
I'm not sure what you are doing here. If the segue points to a view controller directly (and nor via another navigation controller), you do not need the mapping to topviewcontroller, but use the destinationcontroller directly.
Related
sorry for my bad English
i need to pass data from my First View Controller to Front View Controller of SWRevealViewController
in my First View Controller i do this code
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"menu"]) {
SWRevealViewController *sw = (SWRevealViewController *) segue.destinationViewController;
// error is here i get nav with nil
UINavigationController *nav = (UINavigationController *)sw.frontViewController;
FrontViewController *home = (FrontViewController *) nav.topViewController;
home.passed_student = selected_student;
}
}
In storyBord no object(view controller) is created untill it is presented using segue or accessed some other way so here in your code your are presenting the SWRevealViewController but try to access the object of FrontViewController which is not in memory.
So first you should pass your selected_student to your SWRevealViewController then from here to FrontViewController because you can access the object of FrontViewController from here during presenting it using segue. This is the simplest way of doing it.
I need to pass a PFObject to 2 views, first one is detail and second is a segue from the detail. I can easily pass the PFObject to the detail, using PFObject *obj = [array objectAtIndex:indexPath.row], detailVC.object = object in prepareForSegue to a property of the detail view controller, but when I try to pass from the detail to the third view, using vc.object = self.object in prepareForSegue then the value of the PFObject in third view is nil. What is the problem?
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"segue"]) {
thirdVC *vc = (thirdVC *)segue.destinationViewController;
vc.object = self.object;
}
}
I often found this error when I tried to segue to a VC embedded within its own navigation controller. Make sure it is not, and if it is use this to refer to the controller instead
if ([segue.identifier isEqualToString:#"<#Segue Name#>"]) {
UINavigationController *nav = (UINavigationController *)[segue destinationViewController];
<#UIViewController#> *controller = (<#UIViewController#> *)nav.topViewController;
controller.object = self.object;
}
Other than that, I can only think to log the object inside the second VC's prepareForSegue and see if it exists there
I want to pass the variable " uid " between the FirstViewController and SecondViewController, so I used the following code to pass it. It successfully pass it, but the problem it hides the NavigationBar and the TabBar !
How can I solve it?
SecondViewController *vc2 = [self.storyboard instantiateViewControllerWithIdentifier:#"SecondViewController"];
vc2.uid = uid;
[self.navigationController pushViewController:vc2 animated:YES];
Why dont you use storyboard segues to solve this? Just embed you view controller on a Navigation View controller and call performSegueWithIdentifier function.
Just add prepareForSegue function to your class and set uid there:
- (void) prepareForSegue: (UIStoryboardSegue *) segue sender: (id) sender
{
if([segue.identifier isEqualToString:#"secondViewSegue"])
{
//**OPTION A**: If you are using Push segue
SecondViewController *secondVC = (SecondViewController
*)segue.destinationViewController;
//**OPTION B**: ***ELSE, If you are using a Modal segue
UINavigationController *navController = (UINavigationController*)segue.destinationViewController;
SecondViewController *secondVC = (SessionViewController *)navController.topViewController;
//END OF OPTION B
secondVc.uid = uidValue;
}
}
I have two view controllers, MainViewController and SecondViewController.
In my main view controller, I have data I pass to the second view controller like so:
-(IBAction)shareToSocial:(id)sender {
SecondViewController *view2 = (SecondViewsController *)[storyboard instantiateViewControllerWithIdentifier:#"PushToNext"];
view2.secTitle = self.MainTitle;
[self.navigationController setModalPresentationStyle: UIModalPresentationCurrentContext];
[self setModalPresentationStyle:UIModalPresentationCurrentContext];
}
Where both secTitle and MainTitle are NSStrings for each controller. From what I've read, by setting view2.secTitle to self.MainTitle, when SecondViewController pops in I my view2.secTitle will have the same value as MainTitle. So if MainTitle is "Hello World" then I open secondViewController, secTitle would also be "Hello World". However, I've been getting null with secTitle even though I am setting the data for it.
If I use pushViewController instead of modal, the values are passed between the two controllers fine. So I'm not sure if I'm doing anything wrong here exactly.
I've also tried using [view2 setSecTitle:MainTitle] to no avail.
There's not much code on my SecondViewController but here's how it looks:
-(IBAction)showMessage:id(sender){
NSLog(#"test: %#", self.secTitle);
}
-(IBAction)closeMessage:id(sender){
[self dismissViewControllerAnimated:YES completion:nil];
}
Also, I've noticed that when I used dismissViewControllerAnimated on SecondViewController to close it and go back to the MainViewController, a black empty screen shows for a few seconds before showing the Main View and touch events on MainViewController is not detected anymore.
Please help.
Could you use performSegueWithIdentifier and prepareForSegue? If you've got your views in your storyboard and set up a segue between them, given it an identifier and set the style to modal you should be able to do this:
-(IBAction)shareToSocial:(id)sender {
[self performSegueWithIdentifier:#"modelToNextSegue" sender:self];
}
Then in prepareForSegue method you pass your values:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
SecondViewController *view2 = [segue destinationViewController];
view2.secTitle = self.MainTitle;
}
Try this:
SecondViewController *view2 = (SecondViewsController *)[storyboard instantiateViewControllerWithIdentifier:#"PushToNext"];
view2.secTitle = self.MainTitle;
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:view2];
[nav setModalPresentationStyle: UIModalPresentationCurrentContext];
[self setModalPresentationStyle:UIModalPresentationCurrentContext];
I have a viewController that is usually (most often) accessed by using a push segue. This viewController needs to be embedded in a UINavigationController. So typically, this is no problem. The push segue manages pushing the viewController, and therefore the viewController has it's UINavigationController.
My issue is that in a few cases, I'd like to present this same exact viewController using a modal segue. When I do this, the viewController is not embedded in a navigationController. Is there a way to do this using segues?
I know this can be done purely in code without segues by creating a UINavigationController, setting the rootView as the viewController and then presenting that modally. That can be done using code like this :
MyViewController *viewController = [[MyViewController alloc] init];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:viewController];
[self presentModalViewController:navController animated:YES];
But how do I do this same thing but using Segues?
Update
For further clarity, here is some code to supplement how I used the accepted answer in the prepareForSegue method.
When Using Modal Segue
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue destinationViewController] isEqualToString:#"Modal to MyVC"])
{
UINavigationController *nav = [segue destinationViewController];
MyViewController *vc = [nav topViewController];
//setup vc
}
}
When Using Push Segue
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue destinationViewController] isEqualToString:#"Push to MyVC"])
{
MyViewController *vc = [segue destinationViewController];
//setup vc
}
}
In your Storyboard, you can embed a ViewController in a Navigation Controller by selecting the View Controller and then picking from the menu at the top Editor->Embed In->Navigation Controller. From another view controller, you control drag to this Navigation controller to set up the modal segue. You can also control drag to the original View Controller to set up segues to it without the Navigation Controller.