I have a very simple application that has only 2 view controllers. The initial root controller has two UIButtons on it, and they both transition to the 2nd view controller via Storyboard. The information that is loaded on the 2nd view controller is determined by a buttonPressed IBAction that is linked to both the initial view controller. The problem I am having is that once I tap one of the two buttons, I get the 2nd view controller loading up blank. From debugging, I notice that the buttonPressed function is called after the 2nd view is loaded. How can I make it so that the buttonPressed function is called BEFORE the 2nd view controller is loaded blank?
Hardly any code involved, I have both UIButtons tagged 1 and 2, and the button press function loads two text files depending on the sender tag equaling 1 or 2. Everything is linked up in Storyboard. Any suggestions?
*buttonPressed function:
if([sender tag] == 1)
count = 1;
else
count = 2;
The count determines the file to be loaded.
*In Storyboard, I have just 2 view controllers, (No navigation or any of that) and two UIButtons on the initial view and a text view on the second to display text. The UIButtons are connected to buttonPressed and to the 2nd view controller segue.
Don't bother with a IBAction for button pressed. Have the buttons segue to the new controller and use prepareForSegue:sender: to figure out which button was tapped (the sender).
You can then get a reference to your controller that's about to appear with something like...
SecondController *next = (SecondController *)[segue destinationViewController];
...and tell it which file to load, which it can do in viewDidLoad:.
This sounds like a case for prepareForSegue!
-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if([[segue identifier] isEqualToString:#"First Button Segue Identifier"])
{
ViewController *theViewController = segue.destinationViewController;
theViewController.textProperty = self.firstButtonText;
}
else if ([[segue identifier] isEqualToString:#"Second Button Segue Identifier"])
{
ViewController *theViewController = segue.destinationViewController;
theViewController.textProperty = self.secondButtonText;
}
}
There you go, it is pretty generic because I didn't know your variable names or what text you are using. Similarly, if the segues don't have seperate identifiers, you can use the sender to determine which button is being pressed.
Good luck!
Related
I am using storyboard for making iPhone app.
I placed 2 buttons on the main viewcontroller, and add actions to present modal new TestViewController on the Storyboard.
When click 2 buttons, same TestViewController will be shown, but I want to know which button is clicked in the TestViewController viewdidload.
Any advice or help?
what #Richard Brown suggested is good.
Assign tag to buttons and use that as below:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"ChooseAPlayer"]) {
TestViewController = [segue destinationViewController];
TestViewController.variablename = buttontag;
}
}
Assign different segue names to each button and in the prepareForSegue method you can use that information to pass what you want to the new ViewController.
I have view which contains a collection view. I have added this collection view programatically (in viewDidLoad) - so that is not on the storyboard. This collection view contains several cells. When a user clicks on one of the cells in the collection view, I want to segue to a different view controller (that I plan to add on the storyboard). My question is - since the collection view is not on storyboard, how can I segue out of that? Or is there other way to accomplish that.
Some updates to the original question above:
In Parent View Controller, I do the following:
//Layout for the collection view
CDLayout *cdLayout = [[CDLayout alloc] initWithItemSize:CGSizeMake(cardWidth, cardHeight) withItemInsets:UIEdgeInsetsMake(topInset, leftInset, bottomInset, rightInset) withInterItemSpacingX:8.0f withTopMargin:margin withLeftMargin:margin withBottomMargin:margin withRightMargin:margin shouldRotate:NO];
//This is the collection view controller
CDLineLayoutViewController *cdLineVC = [[CDLineLayoutViewController alloc] initWithCollectionViewLayout:cdLayout withItemCount:12 ];
// add the collection view controller to self - the parent
[self addChildViewController:cdLineVC];
[cdLineVC didMoveToParentViewController:self];
// add collectionView as a subview
[self.view addSubview:cdLineVC.collectionView];
The collectionView has 12 cards. When a user clicks on one of the cards I want to move to another view controller.
As you can see the collection view is not on the storyboard. So, is there a way to create a segue?
BTW, one option is what Taseen suggested below. I tried that and it is working. But as I understand it is not actually a "segue."
Can you please show us any code you have written
What i have understood from your question is that you have added collection view in viewDidLoad. and i believe you have set the delegate of collection view to self, So in
didSelectItemAtIndexPath method you can write this code
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
//From indexpath.item, you know which cell was clicked
//using switch method
switch (indexPath.item) {
case 0:
//You Can push the view controller from here
//You need to import the header file of that View controller
DestinationViewController *destinationView;
//if the self controller in which the collection view is shown is embedded in Navigation controller,
//you can push using
[self.navigationController pushViewController:destinationView animated:YES];
//if it is not embedded, use modal segue
[self.modalViewController presentModalViewController:destinationView animated:YES];
break;
default:
break;
}
}
EDIT: The segue you will create on the storyboard from your ParentViewController to DestinationController will have segueIdentifier property. like shown below
then in didSelectItemAtIndexPath instead of pushing the controller you can use this code
[self performSegueWithIdentifier:#"collectionViewSegue" sender:self];
you can also configure the destination view controller using prepareForSegue method..
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
DestinationViewController *targetVC = (DestinationViewCOntroller *)segue.destinationViewController;
//if you pass anything you can do it here
//if to set any public variable for example image for the imageview
targetVC.cardImageView.image = [UIImage imageNamed:#"queen.png"];
}
This method will be in your parent controller.
Create a new segue by ctrl-click on the initial viewController and drag to the destination viewController. Don't forget to set the segue identifier.
than overwrite the -(void)performSegueWithIdentifier:(NSString *)identifier sender:(id)sender method.
I have a question regarding storyboard segues. Platform is iOS 6.1. Target device is iPhone. IDE is Xcode 4.5.2. What I have are 2 TableViewControllers, both of which have a segue (segOne & segTwo) to the same ViewController. The desired outcome is that when a user navigates to this ViewController, they will return to the originating TableViewController. To do this I need some way to pass the id of the originating segue (or TableViewController) to the destination ViewController. In the past I accomplished this by setting up the 'back' button in the NavigationItem which always worked fine. Now, however I want to code the back buttons as separate controls.
I understand that to accomplish this I need to set up the 'prepareForSegue' method in the source TableViewControllers which I have done. Where I am having a problem is writing the code in the destinationViewControllers to programmatically identify which of the two segues is the source segue, segOne or segTwo? Both segues are identified as 'segOne' and 'segTwo' in Storyboard Seque. Both are style 'push' segues and both are destination 'current' segues. Each of the TableViewController implementation files are identical except for the segue ids. Here's my code:
header file:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender;
implementation file:
-(void)prepareForSegue:(UIStoryboardSegue*)segue sender:(id)sender
{
if([[segue identifier] isEqualToString:#"segOne"])
{
NSLog (#"TableViewController1: segue.identifier %#", segue.identifier);
NSLog (#"TableViewController1: self %#", self);
NSLog (#"TableViewController1: sender %#", (id)sender);
}
}
The output is exactly what I would expect. Here it is forTableViewController1:
TableViewController1: segue.identifier segOne
TableViewController1: self <TableViewController1: 0x928eb70>
TableViewController1: sender <UITableViewCell: 0x927a3e0; frame = (0 22; 768 44); text = ' 1. birth month and year...'; autoresize = W; layer = <CALayer: 0x928d380>>
So, what I need is the code for the ViewController that identifies which of the two segues, segOne or segTwo is the originating segue. I do understand that any code needs to go in the viewDidAppear method of the destination ViewController. Once I have this it will be a simple matter to code the IBAction in the ViewController to navigate to the originating TableViewController. Any code examples on how to do this would be appreciated. thx...
When you push a view controller using a Navigation view controller, it will be pushed on the top of a stack with view controllers.
So all you have to do get back to the previous view controller is to pop the one that got pushed.
Put this in your IBAction method:
[self.navigationController popViewControllerAnimated:YES];
Now, if you really want to know what segue that was used, you can just pass the segue identifier to the destination controller, and put it in a property like this:
-(void)prepareForSegue:(UIStoryboardSegue*)segue sender:(id)sender
{
if([[segue identifier] isEqualToString:#"segOne"])
{
MyOtherViewController *other = (MyOtherViewController *)segue.destinationViewController;
other.theSegueIUsed = #"segOne";
}
}
You also need to add the property to the other view controllers header file:
#property (strong, nonatomic)NSString *theSegueIUsed;
I am new to iOS Development and Objective-C in general. Currently I am working on an app that contains 3 tabs. As you can see from the screenshot below the first tab contains a Table View with 2 cells.
So, after the user taps on one of the cells another detail view appears with buttons which later will be changed with pictures of the products that are going to be listed there.
My question is: How do I connect the buttons with another view that will contain a table view with some details?
What you need is a Grid View to display your products. Use GMGridView. Its brilliant...
In your storyboard, hold down the control key and drag from your cell to the view controller you want to connect it to. Then set the segue style to "push." Set the name of your new segue. Then in code set the product data in the -(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender method.
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// GET THE SELECTED ROW
NSInteger selectedRow = [[self.tableView indexPathForCell: sender] row];
// PASS THE CORRESPONDING DATA TO THE NEXT VIEW CONTROLLER
if (segue.identifier isEqualToString: #"MySegue") {
MyViewController* myvc = (MyViewController*)segue.destinationViewController;
MyProductData* selectedData = [_productData objectAtIndex: selectedRow];
myvc.productData = selectedData;
}
}
So once the user taps a product image button, you want to display more detail about that item?
In your image grid view controller, just create a method:
- (IBAction)imageButtonAction:(id)sender {
// do something like check the [sender tag]
// to determine which button sent the message
// then instantiate the detail view controller and push
}
then connect this method to the Touch Up Inside action in Interface Builder. Rather than a proliferation of action methods for each button, you could give each button a tag and route all of their Touch Up Inside actions to the same method.
I have two Views part of a NavigationController hierarchy, one that displays a list of items and the second allows you to edit an item or add a new one.
On the parent view I have an add button on the right of the navigationbar once pressed performs a segue with identity "AddChild". Also, when the user taps on a table item, I perform another segue with identity "EditChild", all set up in storyboard.
In the case the user arrives at the parent view (with the list of items) but no items exist yet, I want to programatically perform the "AddChild" segue, so I added the following code in viewWillAppear: of the parent viewcontroller.
// if there are no children, send user to add screen
if (self.childListData.count == 0) {
[self performSegueWithIdentifier:#"AddChild" sender:self];
}
The child viewcontroller loads fine, but the navigation items are still of the previos view (a back button and an add button instead of a back button and a save button).
This is my prepareForSegue: method:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get a reference to our detail view
ChildDetailTableViewController *childDetail = (ChildDetailTableViewController *)[segue destinationViewController];
// Pass the managed object context to the destination view controller
childDetail.managedObjectContext = managedObjectContext;
// If we are editing a child we need to pass some stuff, so check the segue title first
if ([[segue identifier] isEqualToString:#"EditChild"])
{
// Get the row we selected to view
NSInteger selectedIndex = [[self.tableView indexPathForSelectedRow] row];
// Pass the child object from the table that we want to view
childDetail.currentChild = [childListData objectAtIndex:selectedIndex];
}
}
I'm not sure what I'm missing so if anyone can help, I'd appreciate it.