So I know that if there is a segue which is setup and activated through the storyboard, one can use the prepareForSegue method to pass data to the destination view controller.
I'm wondering if there is a way to do this if one uses the performSegueWithIdentifier method? It seems the prepareForSegue method is only called if the segue is activated with the storyboard, not with performSegue.
One particular problem is that I can't access the UIStoryboardSegue (it is not an argument in performSegue as it is in prepareForSegue), and therefore can't access the destination VC either.
Answer is here in StackOverflow.
How to pass prepareForSegue: an object
// When any of buttons are pressed, push the next view
- (IBAction)buttonPressed:(id)sender
{
[self performSegueWithIdentifier:#"MySegue" sender:sender];
}
// This will get called too before the view appears
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"MySegue"]) {
// Get destination view
SecondView *vc = [segue destinationViewController];
// Get button tag number (or do whatever you need to do here, based on your object
NSInteger tagIndex = [(UIButton *)sender tag];
// Pass the information to your destination view
[vc setSelectedButton:tagIndex];
}
}
Related
I'm trying to create a manual segue, which happens only if there is a certain conidition (a successful login).
The steps I have followed are these:
1) I've created a button in source viewcontroller, and i connected the button with a drag with the destination viewcontroller.
2) I set the identifier for the segue, calling it login_ok
3) I've created a -(IBAction)buttonPressed:(id)sender
Now, I tried to make an example, to see if the work or not. I wrote:
- (IBAction)buttonPressed:(id)sender
{
BOOL test = false;
if(test == true)
{
[self performSegueWithIdentifier:#"login_ok" sender:self];
}
Theoretically, the segue should not work, because i set test=false, and i said the segue should work only if test=true.
But the segue works and makes me go to the destination viewcontroller.
Why?
If you connected the button with a drag to the destination controller, it should segue anyway.
You need to connect the segue between screens and not from the button to the screen. Then, you can control your segue from the code.
You should define your segue between controllers not from button to the controller. Defining segue between view controllers is more useful than defining segue from any component to a view controller, because when you want to use a condition for any action, you can use these two methods effectively
[self performSegueWithIdentifier:#"segueID" sender:self];
and
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
For example:
- (IBAction)buttonPressed:(id)sender
{
BOOL test = YES;
if(test == YES)
[self performSegueWithIdentifier:#"login_ok" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"login_ok"])
{
YourNextController *controller = [segue destinationViewController];
controller.welcomeText = #"Hi! Test is true congratulations";
}
}
Especially passing data from controller to another one, this way is always useful.
I'm new on Stackoverflow and I'm currently learning XCode from scratch and I'm in a process of making a Single Page Application with options.
Anyone knows how to efficiently make a simple menu with multiple selectable UIButtons that make the main ViewController display different datasets depending on the selection in XCode?
Tried different things (creating SecondViewController for example but can't figure out how to pass data from it to main ViewController).
Any help will be greatly appreciated.
Refer this:
https://www.appcoda.com/storyboards-ios-tutorial-pass-data-between-view-controller-with-segue/
How to pass prepareForSegue: an object
Simple Test from above Answer Reference:
Simply grab a reference to the target view controller in prepareForSegue: method and pass any objects you need to there. Here's an example...
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Make sure your segue name in storyboard is the same as this line
if ([[segue identifier] isEqualToString:#"YOUR_SEGUE_NAME_HERE"])
{
// Get reference to the destination view controller
YourViewController *vc = [segue destinationViewController];
// Pass any objects to the view controller here, like...
[vc setMyObjectHere:object];
}
}
REVISION: You can also use performSegueWithIdentifier:sender: method to activate the transition to a new view based on a selection or button press.
For instance, consider I had two view controllers. The first contains three buttons and the second needs to know which of those buttons has been pressed before the transition. You could wire the buttons up to an IBAction in your code which uses performSegueWithIdentifier: method, like this...
//When any of my buttons are pressed, push the next view
- (IBAction)buttonPressed:(id)sender
{
[self performSegueWithIdentifier:#"MySegue" sender:sender];
}
// This will get called too before the view appears
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"MySegue"]) {
// Get destination view
SecondView *vc = [segue destinationViewController];
// Get button tag number (or do whatever you need to do here, based on your object
NSInteger tagIndex = [(UIButton *)sender tag];
// Pass the information to your destination view
[vc setSelectedButton:tagIndex];
}
}
Hope this help but please go through refernces!
Then I call this method I want to have segue. Is it right?
- (void)showMapViewController {
[self performSegueWithIdentifier:#"MapViewController" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"MapViewController"])
{
UINavigationController *navigationController = segue.sourceViewController;
LoginViewController *loginViewController = [[navigationController viewControllers] objectAtIndex:0];
[loginViewController performSegueWithIdentifier:#"MapViewController" sender:self];
}
}
You have to create segue in storyboard and give a unique identifier. It can be perform automaticaly if you set this on some button action, e.g. if you create a segue on button action an want to push a navigation controller. When ever that button will be push segue will be perform automaticlay. In this case if you want to do some custom coding to set some properties etc. then you should implement this delegate method
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"segueIdentifier"])
{
// Here you can get source and destination view controllers and can perform some custom tasks.
}
}
You can also perform segue by code if you want to, for that you have to call this method.
[self performSegueWithIdentifier:#"segueidentifer" sender:self];
For this you have to create a segue in storyboard by clt+drag from one view controller to other(source -> destination) and give an identifier.
I want to create a game which is basically ask your buddy to put a word. And you will guess what word has been entered. For that reason, I have to pass guesword from FirstViewController to SecondViewController.
First View Controller
- (IBAction)doneBtn:(id)sender {
self.guessWord = [enterTF.text lowercaseString];
NSLog (#"Guessword s %#", guessWord);
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Make sure your segue name in storyboard is the same as this line
NSLog (#"%#", [segue identifier]);
if ([[segue identifier] isEqualToString:#"F2S"])
{
// Get reference to the destination view controller
SecondViewController *gvc = [segue destinationViewController];
// Pass any objects to the view controller here, like...
gvc.guessWord =self.guessWord;
}
}
Second View Controller
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
NSLog(#"%#",guessWord);
}
In the SecondViewController guessword output "null". Why am I getting null?
In the second view controller, declare your variable in the .h file, say a string type:
#property (nonatomic, strong) NSString *someText;
Synthesize it in the .m file:
#synthesize someText;
In the first view controller's segue method:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Make sure your segue name in storyboard is the same as this line
NSLog (#"%#", [segue identifier]);
if ([[segue identifier] isEqualToString:#"F2S"])
{
// Get reference to the destination view controller
SecondViewController *gvc = [segue destinationViewController];
gvc.someText = **YOUR TEXT HERE** ; //this should set the value in the second view controller
}
}
If the passed value is not a string, change accordingly.
Here is the sequence of events happening in your code:
The segue object is created. Source and destination view controllers are set on the segue, causing the second view controller to be loaded.
-viewDidLoad: is called on the second view controller.
-prepareForSegue: is called on the first view controller.
-viewWillAppear: and -viewDidAppear: are called on the second view controller.
-viewDidLoad: is called before guessWord is configured in -prepareForSegue:. Try -viewWillAppear: or -viewDidAppear: instead when logging guessWord.
Okey guys, here's the deal...
I'm trying to connect two views with one segue and writing in Label a tag from clicked button. I hope you know what I mean...
Here's the example:
Title view appears and you have to choose the difficulty 1-3 (tag values of buttons) and after clicking your're moved to game view but you'd like to use tag values from title view buttons in game logic.
Here's the sample screen:
This is what I've found and this perfectly suits!
// When any of my buttons are pressed, push the next view
- (IBAction)buttonPressed:(id)sender
{
[self performSegueWithIdentifier:#"Segue" sender:sender];
}
// This will get called before the view appears
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"Segue"]) {
// Get destination view
SecondView *vc = [segue destinationViewController];
// Get button tag number (or do whatever you need to do here, based on your object
NSInteger tagIndex = [(UIButton *)sender tag];
// Pass the information to your destination view
[vc setSelectedButton:tagIndex];
}
}
And here is the link to whole topic.
Set your buttons to trigger the segue that presents the second view controller.
In your first view controller, implement - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender and use the sender to retrieve the tag.