I declared a GamePicerViewController (subclass of UITableViewController) .But I got a bug in the prepareForSegue:sender: method . The console says that gamePickerViewController is a UINavigationController. Have any ideas?
I post the GamePickerViewController.h PlayerDetailsViewController.m and the console in the pic abve.
problem solved.
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"PickGame"]) {
UINavigationController *controller = segue.destinationViewController;
GamePickerViewController *gamePickerViewController = [controller viewControllers][0];
gamePickerViewController.delegate = self;
gamePickerViewController.game = _game;
}
}
I forgot the line:
UINavigationController *controller = segue.destinationViewController;
Related
This question already has answers here:
Passing data between view controllers
(45 answers)
Closed 6 years ago.
I am trying to pass data from one ViewController to another ViewController.
Firstviewcontroller.m
-(void)NavigateToAnotherScreen:(NSMutableDictionary*)dict{
[self performSegueWithIdentifier:#"NavDashBoardToInfo" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"NavDashBoardToInfo"])
{
InfoViewController *vc = [segue destinationViewController];
[vc setAppointmentDictionary:dict];
}
}
Secondviewcontroller.h
#property (strong, nonatomic) NSMutableDictionary *AppointmentDictionary;
Secondviewcontroller.m
#synthesize AppointmentDictionary;
- (void)viewWillAppear:(BOOL)animated{
NSLog(#"dict===>%#",AppointmentDictionary); // This gives me null
}
Please help me. What i am doing wrong.
I am getting AppointmentDictionary = (null) in viewwillappear.
Though I am doing proper copy of this.
try this
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.destinationViewController respondsToSelector:#selector(setAppointmentDictionary:)]) {
[segue.destinationViewController performSelector:#selector(setAppointmentDictionary:)
withObject:dict];
}
}
Try this one:
-(void)NavigateToAnotherScreen:(NSMutableDictionary*)dict
{
[self performSegueWithIdentifier:#"NavDashBoardToInfo" sender:dict];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
InfoViewController *info = segue.destinationViewController;
info.AppointmentDictionary = sender;
}
If you are using performsegue for navigation then you can use below method for transferring data between ViewControllers
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"NavDashBoardToInfo"])
{
InfoViewController *info = [segue destinationViewController];
info.AppointmentDictionary = "Value you want to pass";
}
}
You are creating InfoViewController instance and not pushing that view controller. You doing a "performSegueWithIdentifier" here new instance will create, so you first instance "info" is not passing here. You can do in other way.
InfoViewController *info = [[InfoViewController alloc] init];
info.AppointmentDictionary = [dict mutableCopy];
[self.navigationController pushViewController: info animated:true];
Option 2:
-(void)NavigateToAnotherScreen:(NSMutableDictionary*)dict{
[self performSegueWithIdentifier:#"NavDashBoardToInfo" sender: [dict mutableCopy]];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"NavDashBoardToInfo"]) {
InfoViewController *viewController = (InfoViewController *)segue.destinationViewController;
viewController.AppointmentDictionary = (NSMutableDictionary *)sender;
}
}
In the prepareforsegue method you have to pass the value like mentioned above.
Note: make sure your destination view controller is InfoViewController
If you are using performSegueWithIdentifier then provide the body in function . Don't create any new instance using code and provide segue in storyboard -
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"YourController_Segue"]) {
YourController *viewController = (YourController *)segue.destinationViewController;
viewController.AppointmentDictionary = (NSMutableDictionary *)sender;
}
}
I have project where I'm using UINavegationController between to views:
I'm using the navigation controller because I'm using modal presentation (Flip)
But my problem is I'm trying to pass NSString Object to ViewControllerB:
Code:
- (IBAction)goToB:(id)sender {
[self performSegueWithIdentifier:#"goToB" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"goToB"]) {
BViewController *vc = (BViewController*)[segue destinationViewController];
vc.commigFromA = #"I'm going to B!";
}
}
But I'm getting this error:
-[UINavigationController setCommigFromA:]: unrecognized selector sent to instance 0x7ff1c4830c00
Any of you knows why or a way around this error?
I'll really appreciate your help
It's crashing because the destinationViewController on the segue is actually a UINavigationController, not a BViewController, and UINavigationControllers don't know about a property comingFromA. You can test this theory by replacing prepareWithSegue like this:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"goToB"]) {
UINavigationController *nvc = (UINavigationController*)[segue destinationViewController];
BViewController *vc = (BViewController*)nvc.viewControllers[0];
vc.commigFromA = #"I'm going to B!";
}
}
What is wrong with below code. It is crashing with SIGABRT (unrecognized selector sent to instance)
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
NSLog(#"%#",valueName);
if([segue.identifier isEqualToString:#"pushView"])
{
secondViewController *svc = (secondViewController *)[segue destinationViewController];
svc.passedName = valueName;
}
}
The valueName iVar is an NSString which i want to pass.
1) Don't forget to embed you FirstViewController with NavigationController
2) Don't forget to set your segue identifier.
3) Use the same code you have:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
//for example if you value is "123"
NSString *valueName = #"123";
NSLog(#"%#",valueName);
if([segue.identifier isEqualToString:#"pushView"])
{
secondViewController *svc = (secondViewController *)[segue destinationViewController];
svc.passedName = valueName;
}
}
4) Now, in your secondViewController, log you value in ViewDidLoadto see if it is passed...
- (void)viewDidLoad
{
NSLog(#"value: %#", self.passedName);
}
5) The result you should get:
Here is my Code:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"startGame"]) {
UIViewController *controller = (UIViewController *)segue.destinationViewController;
controller.grade = self.currentGrade;
}
}
Error:
(!)Semantic Issue:
Property "grade" not found on object of type 'UIViewController *'
Why do I get this error? I defined it as a property of the view controller and hooked it up in the storyboard.
Type cast to your viewController
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"startGame"]) {
YourViewController *controller = (YourViewController *)segue.destinationViewController;
controller.grade = self.currentGrade;
}
}
Possbile Case : Check Your UIViewController Custom Class. As the segue.destinationViewController; will return you the object of ViewController what you bind with your root view.
As In Your Case :
UIViewController *controller = (UIViewController *)segue.destinationViewController;
controller.grade = self.currentGrade;
Your Access the grade property of your UIViewController and its not finding so it may be one of the reason of this crash.
The grade is your custom property.
You can customize a viewcontroller, and it define a property: grade.
I have a ViewController that has a couple of buttons on it created in Interface Builder. The first button will display a popover linked up in IB, it is linked to a UINavigationController and has a TableView under it with a class of PopupViewController.
The second button, I have an action setup for goToCategory and when clicking on that, I want to set a property on the PopupViewController
ViewController.m
//go to category
-(IBAction)goToCategory:(id)sender{
NSLog(#"GO TO CAT");
//PopupViewController *popupVC = [self.storyboard instantiateViewControllerWithIdentifier:#"popoverVC"];
//popupVC.currentLevel = 1;
[self performSegueWithIdentifier:#"popoverSegue" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
NSLog(#"seg1");
if ([[segue identifier] isEqualToString:#"popoverSegue"]){
//PopupViewController *popupVC = (PopupViewController *)[[segue destinationViewController] visibleViewController];
//PopupViewController *popupVC = [segue destinationViewController];
PopupViewController *popupVC=[[[segue destinationViewController]viewControllers]objectAtIndex:0];
popupVC.test = #"just a test";
NSLog(#"seg2");
}
}
PopupViewController.h
#property (nonatomic, strong) NSString *test;
PopupViewController.m
#synthesize test;
-(void)viewDidLoad{
NSLog(#"test: %#", test); //returns test: (null)
}
I've found a lot of answers on SO, hence some of the commented out lines in my prepareForSegue. But none of these set the value of test. PopupViewController *popupVC = [segue destinationViewController]; throws an error due to it referring to the UINavigationController so I can't use that as it is, even though that seems to be the way to do it in a lot of answers I've seen. But no matter which way I try doing it, the output is always null?
UPDATE:
PopupViewController *popupVC = (PopupViewController *)[[segue destinationViewController] visibleViewController]; and PopupViewController *popupVC=[[[segue destinationViewController]viewControllers]objectAtIndex:0]; from my prepareForSegue above both work on the 6.1 simulator. My iPad's iOS is 5.1.1 which it isn't working on. Is there something different I need to do for iOS 5?
Try this
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
NSLog(#"seg1");
if ([[segue identifier] isEqualToString:#"popoverSegue"])
{
UINavigationController *navController = (UINavigationController*)[segue destinationViewController];
PopupViewController *popupVC = [navController topViewController];
popupVC.test = #"just a test";
NSLog(#"seg2");
}
}