I do have two ViewController class, one firstviewController other secondViewController in first viewcontroller i call this [self dimissModalViewControllerAnimation:NO];
to dimiss the view! now i need to dimiss the same view from another secondViewController class.
So do i need to call super in that!
[super dismissModalViewControllerAnimated:NO];
Or Do i need to create any protocol for dismissing the view! from another secondViewController class.
Can any guide me with this issue.
you can register a notification in firstViewController's viewDidLoad
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(handleNotification:) name:#"MyNotification" object:nil];
Add the event handler in firstViewController
- (void)handleNotification:(NSNotification*)note {
[self dismissModalViewControllerAnimated:NO];
}
Then you can trigger the event in secondViewController
[[NSNotificationCenter defaultCenter] postNotificationName:#"MyNotification" object:nil ];
You should only be using super when you're overloading a method definition, e.g.:
- (void)viewDidLoad
{
[super viewDidLoad];
self.title = #"Login / Signup";
}
Typically, if you're trying to tell one view to do something from another view, delegates are your friend. You could create a weak delegate variable to hold a reference to the view controller to be dismissed, and call [delegate dismissModalViewControllerAnimated:NO];
Related
I have a modalViewController that comes up over the top of a viewController with a tableView. When the user clicks a button on the modalViewController I want to reload the tableView within the viewController with this:
[tableView1 reloadData];
I do not want to put the reload in the viewDidAppear or viewWillAppear methods as they get called when i do not need the tableView to reload (i.e. when the user clicks the back button to return to the tableView).
Is there a way to do this?
Try
1) write one method which reloads the table data.
2) Call it on the back button clicked.
This is the classic delegate pattern problem, in your modal view controller you need a delegate reference to the current view controller presenting it
//Modal
#protocol ModalVCDelegate
- (void)tappedBackButton;
#end
#class ModalVC: UIViewController
#property id<ModalVCDelegate> delegate;
#end
#implementation
- (void)backButtonTapped:(id)sender
{
if (self.delegate)
[self.delegate tappedBackButton];
}
#end
Now, in your presenting VC, just process this delegate message
//Parent VC
- (void)showModal
{
ModalVC *vc = [ModalVC new];
vc.delegate = self;
//push
}
- (void)tappedBackButton
{
[self.tableView reloadData];
//close modal
}
You can use delegate . If find it more harder then alternative is to use NSNotificationCenter. You can see accepted answer for Refreshing TableView. This is really very short, easy and understandable way.
using Notification like bellow Method:-
Create NSNotificationCenter at yourViewController's ViewdidLoad Mehod
- (void)viewDidLoad
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(ReloadDataFunction:)
name:#"refresh"
object:nil];
[super viewDidLoad];
}
-(void)ReloadDataFunction:(NSNotification *)notification {
[yourTableView reloadData];
}
Now you can Call this Notification from your modelViewController BackButton or else you want from calling this Refresh notification like putting this line of code:-
[[NSNotificationCenter defaultCenter] postNotificationName:#"refresh" object:self];
NOTE: postNotificationName:#"refresh" this is a key of particular Notification
Try to use this one
Make a Button and click on this button and than you can reload your data.
This button make custom and use it on background.
- (IBAction)reloadData:(id)sender
{
[tblView reloadData];
}
You can use NSNotification to refresh table on ViewController.
Inside viewController :
-(void)dealloc{
[[NSNotificationCenter defaultCenter] removeObserver:self];
[super dealloc];
}
Write code in viewDidLoad:
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(reloadMainTable:)
name:#"ReloadTable"
object:nil];
- (void) reloadMainTable:(NSNotification *) notification
{
[tableView reload];
}
Inside ModelViewController:
[[NSNotificationCenter defaultCenter]
postNotificationName:#"ReloadTable"
object:nil];
Here you can also send custom object instead of nil parameter. But be care full about removal of NSNotification observer.
I have this question asked few times and I have tried a few different methods but have not been successful.
The latest method I have tried is as followed :
I included the ViewController that I wanted to show. I then put this code in the didReceiveRemoteNotification method.
CarFinderViewController *pvc = [[CarFinderViewController alloc] init];
// [self.window.rootViewController presentViewController:pvc animated:YES completion:nil];
[(UINavigationController *)self.window.rootViewController pushViewController:pvc animated:NO];
This did not work. I think the problem I may be having is that my initial view is not a navigation controller like a lot of the examples show.
This is a picture of my story board> The VC that I want to send the user to is the car finder (bottom right)
Can someone explain to me what I might be doing wrong?
You could use basically postNotification when you receive the Remote Notification
for exmaple in your didReceiveRemoteNotification post notification like this
[[NSNotificationCenter defaultCenter] postNotificationName:#"pushNotification" object:nil userInfo:userInfo];
now in your FirstViewController's you can register the FirstViewController for this notification like this
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(pushNotificationReceived) name:#"pushNotification" object:nil];
and in your method
-(void)pushNotificationReceived{
CarFinderViewController *pvc = [[CarFinderViewController alloc] init];
[self presentViewController:pvc animated:YES completion:nil];
}
don't forget to remove the observer from notification in your dealloc method
-(void)dealloc {
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
I think the simplest solution would be to show the CarFinderViewController as a modal view instead of trying to push it to a navigation controller which may or may not be visible at the time.
Another important point to avoid further inconsistencies I'd recommend you instantiate your CarFinderViewController from the storyboard instead of directly through the class methods.
Something like:
UIViewController * vc = self.window.rootViewController;
// You need to set the identifier from the Interface
// Builder for the following line to work
CarFinderViewController *pvc = [vc.storyboard instantiateViewControllerWithIdentifier:#"CarFinderViewController"];
[vc presentViewController:pvc animated:YES completion:nil];
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Passing Data between View Controllers
I have 2 modal views. The first modal view is used to edit quantity and price; the second modal view is used when we click the price textfield of first modal view in order to give give reason why we change the price and we can put new price in price textfield of modal view. I want the price in first modal view change when I set the price in second modal view. How to catch the value of second modal view to put in first modal view ?
Use NSNotification center
You have to addobserver event in First Modalview
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(reload:) name:#"refresh" object:nil];
}
- (void)reload:(NSNotification *)notification {
textfield.text= [[notification userInfo] valueForKey:#"price"] ;
}
In second modalview you have to post notification after you complete edit
(pass your textfield value)
NSDictionary *userInfo = [NSDictionary dictionaryWithObject:#"333" forKey:#"price"];
[[NSNotificationCenter defaultCenter] postNotificationName:#"refresh" object:nil userInfo:userInfo]
;
Finally remove observer
-
(void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[[NSNotificationCenter defaultCenter] removeObserver:self name:#"refresh" object:nil];
}
You can used Singleton just to save some data on that class
The following simple steps will make you able to do this.
In the first Modal ViewController, you can declare a function like
- (void) setUpdatedValueWithValue: (NSString *) newValue
{
self.objTextField.text = newValue;
}
Declare this function on the header file too, so that we can access it from the other class.
In the second Modal ViewController
SecondViewController.h
#interface SecondViewController : UIViewController
{
id objFirstViewController;
}
#property (nonatomic, retain) id objFirstViewController;
#end
SecondViewController.m
#implementation SecondViewController
#synthesize objFirstViewController;
#end
Before you present the SecondViewController pass the object of FirstViewController to SecondViewController like,
- (void) presentSecondViewController
{
SecondViewController *objSecondViewController = [[SecondViewController alloc] init];
objSecondViewController.objFirstViewController = self;
[self presentModalViewController: objSecondViewController animated: YES];
[objSecondViewController release];
objSecondViewController = nil;
}
Then, in the function you are calling to dismiss the SecondViewController after the value edit you can do like,
- (void) finishEdit
{
if([objFirstViewController respondsToSelector: #selector(setUpdatedValueWithValue:)])
{
[objFirstViewController performSelector: #selector(setUpdatedValueWithValue:) withObject: editedTextView.text];
}
[self dismissModalViewControllerAnimated: YES];
}
Hope this helps.
set you object with your keyword
[[NSUserDefaults standardUserDefaults]setObject:#"value of second modal view" forKey:#"keyName"];
than get that object in first modal view
NSString *name = [[NSUserDefaults standardUserDefaults]objectForKey:#"keyName"];
I'm trying to present a Modal View Controller when the app enters in foreground.. These are my files:
AppDelegate.m :
#import "AppDelegate.h"
#import "MainViewController.h"
- (void)applicationWillEnterForeground:(UIApplication *)application
{
[self.window makeKeyAndVisible];
MainViewController * vc = [[MainViewController alloc]init];
[vc myMethodHere];
}
MainViewController.h :
//[..]
-(void) myMethodHere;
MainViewController.m :
-(void)myMethodHere{
NSLog(#"myMethodHere Activated.");
TWTweetComposeViewController *tweetViewController = [[TWTweetComposeViewController alloc] init];
[self presentModalViewController:tweetViewController animated:YES];
}
NSLog(#"myMethodHere Activated.") works.. so I can't understand why "presentModalViewController" doesn't! What should I edit/add? Maybe a delay? Thanks for your help..
p.s. I know my english sucks.. Forgive me :)
I wouldn't rely on the methods in your app delegate for this (even though it seems like the obvious solution) because it creates unnecessary coupling between your application delegate and the view controller. Instead, you can have MainViewController listen for the UIApplicationDidBecomeActive notification, and present the tweet composer view controller in response to this notification.
First, register for the notification in -viewDidLoad.
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(myMethodHere) name:UIApplicationDidBecomeActiveNotification object:nil];
}
Now, when this notification is received when your app returns from the background, myMethodHere will be invoked.
Lastly, remember to remove yourself as an observer when the view unloads.
- (void)viewDidUnload
{
[super viewDidUnload];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidBecomeActiveNotification object:nil];
}
i need to dismiss my uiimagepicker modal viewcontroller automatically when the application enters the background.i tried to put the code to dismissmodalviewcontroller code in viewdiddissappear method,but its not being called.so i made a reference to the viewcontroller in appdelegate and tried to put it in the applicationdidenterbackgroundmethod but still it is not working.can someone point out the right way to do this
Try to add an NSNotificationCenter observer for UIApplicationDidEnterBackgroundNotification in the UIViewController that you want to dismiss. Use the selector to dismiss the modalview
- (void)viewWillAppear:(BOOL)animated
{
[[NSNotificationCenter defaultCenter] addObserver: self
selector: #selector(didEnterBackground:)
name:UIApplicationDidEnterBackgroundNotification
object:nil];
}
- (void)viewWillDisappear:(BOOL)animated
{
[[NSNotificationCenter defaultCenter] removeObserver: self
name:UIApplicationDidEnterBackgroundNotification
object:nil];
}
- (void)didEnterBackground:(NSNotification*)note
{
[self.navigationController dismissModalViewAnimated:NO];
}
Best way to remove the modal when app is moving to background and it works fine .
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(dismissView:)
name:UIApplicationDidEnterBackgroundNotification object:nil];
}
- (void)dismissView:(id)sender {
[self dismissModalViewControllerAnimated:YES];
}
- (void)dealloc {
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
Also you can remove observer like this
[[NSNotificationCenter defaultCenter] removeObserver: self
name:UIApplicationDidEnterBackgroundNotification
object:nil];
I don't think you need to go through all that.
From the docs:
If you present several modal view controllers in succession, and thus build a stack of modal view controllers, calling this method on a view controller lower in the stack dismisses its immediate child view controller and all view controllers above that child on the stack.
Try calling [self dismissModalViewController:NO] from the parent view controller in your implementation of - (void) viewDidUnload.
This is untested, but the docs imply that it should do the job for you.