I will give a outline of the program below but, when pushing a new view controller (not a tab bar view) I select a value on a stepper and then click a button to go back. I am trying to send the stepper value to the FirstViewController from FilterViewController.
The program:
App loads on FirstViewController which is the first tab of a tab bar controller, in the top left of the screen is a button (magnifying glass) which opens up FilterViewController.
FilterViewController has a stepper, a label (which displays the value of the stepper) and a button. You click the button, it saves to a variable the value of the stepper and I need to pass it to FirstViewController.
FirstViewController.h (the property im accessing from FilterViewController)
#interface FirstViewController : UIViewController
{
NSString *passedData;
}
#property(nonatomic, retain) NSString *passedData;
FirstViewController.m (code that pushes the new view controller, the property is also synthesised in the implementation)
- (IBAction)searchOptions:(id)sender {
FilterViewController *ctrl = [[FilterViewController alloc] init];
[UIView transitionFromView:self.view toView:ctrl.view duration:1 options:UIViewAnimationOptionTransitionCurlUp completion:nil];
self.filterViewController = ctrl;
[self.navigationController pushViewController:self.filterViewController animated:NO];
}
FilterViewController.m (code that saves the value and passes it to FirstViewController)
- (IBAction)backToMap:(id)sender {
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil];
FirstViewController *fvc = [storyboard instantiateViewControllerWithIdentifier:#"TabBarController"];
fvc.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
self.firstViewData = fvc;
fvc.passedData = #"yo";
//firstViewData.passedData = #"hello test test test";
[self presentViewController:fvc animated:YES completion:nil];
}
When it gets to the execution of this it crashes saying: [UITabBarController setPassedData:]: unrecognized selector sent to instance
Assuming you mean that the crash happens in following line of your code
fvc.passedData = #"yo";
you may want to check that fvc is indeed a FirstViewController NSLog("%#", fvc); i.e. was the class in IB changed from a UIViewController to a FirstViewController ?
Look at your code. You are giving TabBarController as identifier for FirstViewController. May be you are mistaken
FirstViewController *fvc = [storyboard instantiateViewControllerWithIdentifier:#"TabBarController"]; // Here check the identifier
fvc.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
self.firstViewData = fvc;
Related
I have a button inside my nib file. How can I programmatically present another view controller when the user taps on this button?
As I understood , you want to push new viewController on Button click . Please try this
- (IBAction)buttonClicked {
MyViewController *myViewController = [[MyViewController alloc]init];
[self presentViewController: myViewController animated:YES completion:nil];
}
First you need to create an action for your button, normally via Ctrl+drag. On that action implementation you should alloc the destination ViewController. The code would be something like this:
- (IBAction)buttonTapped {
MyViewController *modalViewController = [MyViewController new];
[self presentViewController:modalViewController animated:YES completion:nil];
}
Since you said that your file is a nib, I'm assuming that you aren't on a storyboard with both ViewControllers on it and the ViewController to be presented is code based. If this isn't the case, please elaborate your question.
As requested: Loading a VC from a storyboard
- (IBAction)buttonTapped {
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"MyStoryboard" bundle:nil];
RSSViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:#"RSSVC"];
// OR If is initial
// RSSViewController *viewController = [storyboard instantiateInitialViewController];
viewController.feedURL = #"...";
[self presentViewController:viewController animated:YES completion:nil];
}
If you need, ViewController identifier should be set in the Identity Inspector in the Storyboard.
Refer the below screenshots
First : control+drag the button
Second: Once you release the mouse,it shows you the box
Third:Click Connection Dropdown box.It shows you 3 option
Fourth:Choose or Select Action from the drop down.
Five : Finally give action name
now in ViewContoller.h the action method is
- (IBAction)actionGoNextPage:(id)sender;
Then in ViewContoller.m
#import "SecondViewController.h"
- (IBAction)actionGoNextPage:(id)sender
{
SecondViewController *secondVC = [[SecondViewController alloc]initWithNibName:#"SecondViewController" bundle:nil];
[self presentViewController:secondVC animated:YES completion:nil];
}
I'm writing a program for fun, and in it I have a UIViewController with four buttons, they all send the user to another view, but depending on what button is pressed, I want the label in that other view to have a different text. To do that, I decided to have the label's text to be set equals to a NSString variable, and that variable is set to a certain text depending on what button is pressed. So I have this:
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
UIViewController *vc = [mainStoryboard instantiateViewControllerWithIdentifier:#"resultScreen"];
[self presentViewController:vc animated:YES completion:nil];
_myLabel.text = [NSString stringWithFormat:myText];
In which myText is the NSString variable I want the label to be set to.
Everything seems to be in order, but the label won't have it's text changed. If I try to change it's text inside the viewDidLoad function, though, it works just fine, so I don't know what is happening.
Any idea of what I might need? If you need more info, just comment what you want and I will try to provide it.
You cannot update UI of other controller from current one - you can set variables and later on in viewDidLoad or viewWillAppear you can assign those values to UI
In File: FirstViewController.m
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
SecondViewController *vc = [mainStoryboard instantiateViewControllerWithIdentifier:#"SecondViewController"];
vc.passedText = #"Hello Next";
[self.navigationController pushViewController:vc animated:YES];
In File: SecondViewController.h
#interface SecondViewController : UIViewController
#property (strong, nonatomic) IBOutlet UILabel *myLabel;
#property (strong, nonatomic) NSString *passedText;
In File: SecondViewController.m
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:YES];
self.myLabel.text = self.passedText;
}
I think you need to set your ViewController's property before calling the:
[self presentViewController:vc animated:YES completion:nil];
If you set it after presenting the view, you have to manually refresh the view, which is a bit of an overkill. Just set it before presenting the view. So it would look like:
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
ResultScreenViewController *vc = (ResultScreenViewController *)[mainStoryboard instantiateViewControllerWithIdentifier:#"resultScreen"];
vc.customTitleLabel.text = [NSString stringWithFormat:myText];
[self presentViewController:vc animated:YES completion:nil];
In your ViewController header file:
#property (nonatomic, strong) UILabel *customTitleLabel;
First Create a subclass of a UIViewController with a custom label:
#interface NextViewController : UIViewController
#property (nonatomic, strong) UILabel* customLabel
#end
Now back to your code. You simple cast the UIViewController you get to the subclass you created so you can access the label inside you view controller.
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
NextViewController* nextVC = (NextViewController*)[mainStoryboard instantiateViewControllerWithIdentifier:#"resultScreen"];
nextVC.customLabel.text = [NSString stringWithFormat:myText];
[self presentViewController:nextVC animated:YES completion:nil];
Ok, with the help of one of the answers here I found I solution that works for me. Before, when I had
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
UIViewController *vc = [mainStoryboard instantiateViewControllerWithIdentifier:#"resultScreen"];
[self presentViewController:vc animated:YES completion:nil];
_myLabel.text = [NSString stringWithFormat:myText];
I didn't realise that the resultScreen wasn't linked to UIViewController, but to ViewContronller. So all I needed to do was change the vc declaration to
ViewController *vc = (ViewController *)[mainStoryboard instatiateViewControllerWithIdentifier:#"resultScreen:];
So then all I needed to do was change the label's text at the ViewDidLoad module. It works just fine for me now.
Its simple..
if ([_mylabel.text isEqualToString: myText)
{
//--- Now process your method here. Show alert or what else you need
}
try this. I think that accessing UIlabel directly of other UIViewController is not a good approach. Follow this & it will definitely work.
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
resultScreen *vc = [mainStoryboard instantiateViewControllerWithIdentifier:#"resultScreen"];
vc.strText = myText;
[self presentViewController:vc animated:YES completion:nil];
In your resultScreen view controller create a NSString property.
resultScreen.h
#property (retain, nonatomic) NSString *strText;
resultScreen.m
-(void)viewDidLoad
{
self.myLabel.text = self.strText;
}
you are trying to set the labelText before presenting the second View.
Before view gets loaded into the memory, its all outlets are nil.
so use the NSString variable in second view, and try to set the value of that variable,and then in
viewWillAppear: method assign the value of string variable to the labelText, this will definitely work.
Cheers!
I was having memory management issues, finally found out the problem, I keep instantiating new view controllers. When the app launches it goes straight to the FirstViewController which is an element inside of UITabBarController in the storyboard.
I then show FilterViewController with this method:
- (IBAction)searchOptions:(id)sender {
FilterViewController *ctrl = [[FilterViewController alloc] init];
[UIView transitionFromView:self.view toView:ctrl.view duration:1
options:UIViewAnimationOptionTransitionCurlUp completion:nil];
self.filterViewController = ctrl;
[self.navigationController pushViewController:self.filterViewController
animated:NO];
}
Which works fine and brings up FilterViewController which has its own .xib, so it is not in the storyboard.
Now when trying to pop back to FirstViewController I use this method:
- (IBAction)backToMap:(id)sender {
// i used the below when trying to push another view controller
/*UIStoryboard *storyboard = [UIStoryboard storyboardWithName
:#"MainStoryboard" bundle:nil];
FirstViewController *fvc = [storyboard
instantiateViewControllerWithIdentifier:#"FirstViewController"];
fvc.modalTransitionStyle = UIModalTransitionStyleCoverVertical;*/
[self.navigationController popViewControllerAnimated:YES];
}
However it doesnt do anything. Nothing at all, I cant see what is wrong here?
popViewontrollerAnimated is only used when you have pushed your view controller onto a navigation stack, so it won't do anything here unless there is one in your project.
When you use transitionFromView... you are replacing your current view with the new view so you will need to call it again to get back to your old one.
I have looked at all the tutorials I can find on this one, and I still don't have the answer. I need to call another view from the code. I am using UIStoryboards. I have changed the view many times by control-dragging from UIButtons, but now it must be from the code. I am trying to call the info page from the main menu if it is the first time the user has opened the app. I cannot seem to find a way to change the views from the code, however. All my views are controlled by the same files (ViewController2). The identifier of my main menu is ViewControllerMain, and the identifier of the info page is ViewControllerInfo. First I tried this:
[ViewControllerMain presentViewController: ViewControllerInfo
animated:YES
completion: NULL];
Then I tried making different UIViewControllers for each and saying:
[ViewController2 presentViewController: ViewController
animated:YES
completion: NULL];
Neither worked. For the first one, it says:
Use of undeclared identifier ViewControllerMain.
In the second one, it says:
unexpected interface name 'ViewController': expected identifier.
What can I do?
To create a view controller:
UIViewController * vc = [[UIViewController alloc] init];
To call a view controller (must be called from within another viewcontroller):
[self presentViewController:vc animated:YES completion:nil];
For one, use nil rather than null.
Loading a view controller from the storyboard:
NSString * storyboardName = #"MainStoryboard";
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:storyboardName bundle: nil];
UIViewController * vc = [storyboard instantiateViewControllerWithIdentifier:#"IDENTIFIER_OF_YOUR_VIEWCONTROLLER"];
[self presentViewController:vc animated:YES completion:nil];
Identifier of your view controller is either equal to the class name of your view controller, or a Storyboard ID that you can assign in the identity inspector of your storyboard.
You need to instantiate the view controller from the storyboard and then show it:
ViewControllerInfo* infoController = [self.storyboard instantiateViewControllerWithIdentifier:#"ViewControllerInfo"];
[self.navigationController pushViewController:infoController animated:YES];
This example assumes that you have a navigation controller in order to return to the previous view. You can of course also use presentViewController:animated:completion:. The main point is to have your storyboard instantiate your target view controller using the target view controller's ID.
Swift
This gets a view controller from the storyboard and presents it.
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let secondViewController = storyboard.instantiateViewController(withIdentifier: "secondViewControllerId") as! SecondViewController
self.present(secondViewController, animated: true, completion: nil)
Change the storyboard name, view controller name, and view controller id as appropriate.
You can call ViewController this way, If you want with NavigationController
1.In current Screen : Load new screen
VerifyExpViewController *addProjectViewController = [[VerifyExpViewController alloc] init];
[self.navigationController pushViewController:addProjectViewController animated:YES];
2.1 In Loaded View : add below in .h file
#interface VerifyExpViewController : UIViewController <UINavigationControllerDelegate>
2.2 In Loaded View : add below in .m file
#implementation VerifyExpViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.navigationController.delegate = self;
[self setNavigationBar];
}
-(void)setNavigationBar
{
self.navigationController.navigationBar.backgroundColor = [UIColor clearColor];
self.navigationController.navigationBar.translucent = YES;
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:#"B_topbar.png"] forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.titleTextAttributes = #{NSForegroundColorAttributeName: [UIColor whiteColor]};
self.navigationItem.hidesBackButton = YES;
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:#"Btn_topback.png"] style:UIBarButtonItemStylePlain target:self action:#selector(onBackButtonTap:)];
self.navigationItem.leftBarButtonItem.tintColor = [UIColor lightGrayColor];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:#"Save.png"] style:UIBarButtonItemStylePlain target:self action:#selector(onSaveButtonTap:)];
self.navigationItem.rightBarButtonItem.tintColor = [UIColor lightGrayColor];
}
-(void)onBackButtonTap:(id)sender
{
[self.navigationController popViewControllerAnimated:YES];
}
-(IBAction)onSaveButtonTap:(id)sender
{
//todo for save button
}
#end
Hope this will be useful for someone there :)
There's 2 ways you can do this:
1, Create a segue to your ViewController in your Storyboard as explained in my answer here: How to perform a segue that is not related to user input in iOS 5?
2, Give your ViewController and identifier and call it using the code in my answer here: Call storyboard scene programmatically (without needing segue)?
main logic behind this is_,
NSString * storyboardIdentifier = #"SecondStoryBoard";
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:storyboardIdentifier bundle: nil];
UIViewController * UIVC = [storyboard instantiateViewControllerWithIdentifier:#"YourviewControllerIdentifer"];
[self presentViewController:UIVC animated:YES completion:nil];
UIStoryboard* storyboard = [UIStoryboard storyboardWithName:#"MainStoryboard_iPhone_iOS7" bundle:nil];
AccountViewController * controller = [storyboard instantiateViewControllerWithIdentifier:#"accountView"];
// [self presentViewController:controller animated:YES completion:nil];
UIViewController *topRootViewController = [UIApplication sharedApplication].keyWindow.rootViewController;
while (topRootViewController.presentedViewController)
{
topRootViewController = topRootViewController.presentedViewController;
}
[topRootViewController presentViewController:controller animated:YES completion:nil];
Import the view controller class which you want to show and use the following code
KartViewController *viewKart = [[KartViewController alloc]initWithNibName:#"KartViewController" bundle:nil];
[self presentViewController:viewKart animated:YES completion:nil];
I'm using storyboard and I have a view that loads dynamic buttons. On click of this button, I need to load the second view controller and also pass data. I cannot use segue as its dynamic button.
I use following code to load the second view controller
UIStoryboard* sb1 = [UIStoryboard storyboardWithName:#"MainStoryboard_iPhone"
bundle:nil];
UIViewController* vc1 = [sb1 instantiateViewControllerWithIdentifier:#"SecondViewController"];
[self.navigationController pushViewController:vc1 animated:YES];
In the 2nd view controller, I need to access about 5 fields from the 1st view controller. How do I pass the data?
You can create a Segue not bounded to a button by ctrl+drag from the first controller to the second one (don't forget to give this segue and identifier).
Next In the IBAction of the button (set via Interface Builder or via addTarget:self action:forControlEvents: ) you can call the [self performSegueWithIdentifier:#"YourSegueIdentifier" sender:button];
You can pass the data to the second controller, as usual, in - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
Try something like that:
Class A
// CLASS_A.h
#import <UIKit/UIKit.h>
#interface CLASS_A : UIViewController {
...
}
- (IBAction)Btn_PushPressed:(id)sender;
...
#end
// CLASS_A.m
#import "CLASS_A.h"
#import "CLASS_B.h"
#implementation CLASS_A
- (IBAction)Btn_PushPressed:(id)sender
{
UIStoryboard* sb1 = [UIStoryboard storyboardWithName:#"MainStoryboard_iPhone"
bundle:nil];
CLASS_B* vc1 = [sb1 instantiateViewControllerWithIdentifier:#"SecondViewController"];
vc1.delegate = self;
[self.navigationController pushViewController:vc1 animated:TRUE];
}
....
#end
Class B
// CLASS_B.h
#import <UIKit/UIKit.h>
#class CLASS_A;
#interface CLASS_B : UIViewController {
...
}
#property (weak, nonatomic) CLASS_A *delegate;
....
#end
// CLASS_B.m
#import "CLASS_B.h"
#import "CLASS_A.h"
#implementation CLASS_B
....
#end
This is how to do it in Swift 2.0. Instead of using prepareForSegue,
Swift 3.0
let someViewConroller = self.storyboard?.instantiateViewController(withIdentifier: "SomeViewController") as! SomeViewController
someViewConroller.someObject = self.someObject!
self.navigationController?.pushViewController(someViewConroller, animated: true)
Swift 2.0
let someViewConroller = self.storyboard?.instantiateViewControllerWithIdentifier("SomeViewController") as! SomeViewController
someViewConroller.someObject = self.someObject!
self.navigationController?.pushViewController(someViewConroller, animated: true)
Swift 3
let destinationView = self.storyboard?.instantiateViewController(withIdentifier: "ID") as! ViewController2
destinationView.Value2 = Value1
self.present(destinationView, animated: true, completion: nil)
You can simply use
NSUserDefaults
to store the data and retrieve in what ever page you need
In view controller A
[[NSUserDefaults standardUserDefaults] setObject:aData forKey:#"DATA"];
[[NSUserDefaults standardUserDefaults] synchronize];
In destination Controller
NSData * aData = [[NSUserDefaults standardUserDefaults] valueForKey:#"DATA"];
firstly you can use segue even you have dynamic buttons, just add target method to UIButtons and push view controller using segue in that method. in the second view controller, take few properties and assign values to those properties before you push second view controller. like:
UIStoryboard* sb1 = [UIStoryboard storyboardWithName:#"MainStoryboard_iPhone"
bundle:nil];
UIViewController* vc2 = [sb1 instantiateViewControllerWithIdentifier:#"SecondViewController"];
[vc2 setName:#"name"];
[self.navigationController pushViewController:vc2 animated:YES];
before that you need to assign property to a NSString *name in SecondViewController
You can define a protocol: PassValueDelegate,and in the first viewController you can implement this protocol.
UIStoryboard* sb1 = [UIStoryboard storyboardWithName:#"MainStoryboard_iPhone" bundle:nil];
UIViewController* vc1 = [sb1 instantiateViewControllerWithIdentifier:#"SecondViewController"];
//set the delegate for the second view controller,so you can access the values in the first controller
vc1.delegate = self;
[self.navigationController pushViewController:vc1 animated:YES];