I have a screen with a button. Clicking the button will display a popover with two buttons. I want to be able to use the following method when the popover is dismissed:
#pragma mark - UIPopoverControllerDelegate
- (void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController {
NSLog(#"OrderViewController.m -popoverControllerDidDismissPopover start");
}
The popover view has its own class:
#import <UIKit/UIKit.h>
#import "MenuItemModel.h"
#interface SelectedItemsOptionsViewController : UIViewController
#property (weak) id <UIPopoverControllerDelegate> delegate;
#property (strong, nonatomic) MenuItemModel *item;
#end
The class which creates the popover has:
#interface OrderViewController : UIViewController <PageViewControllerDelegate,
UITableViewDataSource, UITableViewDelegate, ServiceConnectorDelegate,
UIPopoverControllerDelegate>
So the OrderViewController - wants to know when SelectedItemsOptionsViewController has been dismissed.
I have the method declared (first block of code) and I am setting the delegate as:
SelectedItemsOptionsViewController *destViewController = (SelectedItemsOptionsViewController *)segue.destinationViewController;
popSegue = (UIStoryboardPopoverSegue *)segue;
[destViewController setDelegate:self];
destViewController.item = toDisplay;
So I am setting the delegate OK as far as i'm aware... the delegate property is #syntheized in th SelectedItemsOptionsViewController.m and well, its driving me a bit crazy.
I could be misunderstanding something here but looks like you're assigning the delegate for a UIViewController class, but where are you assigning the popOver its delegate, in the storyboard?
Related
I am a very beginner of objective c and I wanted to create a scene about using 2 child view controller in a master view controller which includes MapKit and TableView. I ve searched it on internet for 1 day and but I couldn't make any of solutions since I failed in different steps of each suggestions. I know that there are a lot of way to pass data between View Controllers and I thought the best way is using delegation logic in this situation. (let me know if I am wrong please). By the way, I can update or move the cursor onto specific location WHEN I set a dummy button on MapKitViewController, so MapKit part is not where I am failing at. I am pretty sure that the problem is about communication between 2 View Controllers which are active at the same time.
Problem:
Updating MapView by clicking a table row of TableView which includes location coordinate detail. Both children view are set on a MasterViewController by 2 container views.
Tried so far:
Created a method "goToLocation:(Location*) location" in MapViewController and sent parameters to this method from TableViewController. =>(Lat and Long parameters received by goToLocation() but MapKitView doesn't get updated)
Tried to create a delegate logic between MapView and TableView.=>(Probably I couldn't create it properly. Please see below)
What I want :
I want to know what part I am doing wrong. Is there a easy or proper way to achieve that ?
TableViewController.h
#class TableViewController; //define class
#protocol TableViewDelegate <NSObject> //define delegate protocol
//define delegate method to be implemented within another class
- (void) locationSelected: (TableViewController *) sender object:(Location *) location;
#end
#property (nonatomic, weak) id <TableViewDelegate> delegate; //define TableViewVCDelegate as delegate
TableViewController.m
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
[self notifyNow:[_locations objectAtIndex:indexPath.row]];
}
- (void) notifyNow:(Location *) location {
//this will call the method implemented in your other class
[self.delegate locationSelected:self object:(Location *) location];
NSLog(#"Selected: %#",[location name]);
}
MapViewController.h
//make it a delegate for TableViewVCDelegate
#interface MapViewController : UIViewController <TableViewDelegate>
MapViewController.m
- (void)viewDidLoad {
_tableViewController = [[TableViewController alloc]init];
_tableViewController.delegate = self; //set its delegate to self somewhere
}
!!_ This Method Doesn't Get Triggered _!!
- (void)locationSelected:(TableViewController *)sender object:(Location *)location {
NSLog(#"%# is great!", [location name]);
}
MainViewController.m (Master/Root View Controller)
#import "MainViewController.h"
#import "MapViewController.h"
#import "TableViewController.h"
#interface MainViewController ()
#property (strong, nonatomic) IBOutlet UIView *topCont;
#property (strong, nonatomic) IBOutlet UIView *bottomCont;
#property (strong, nonatomic) IBOutlet UIView *safeArea;
#end
#implementation MainViewController
MapViewController *mapViewVC;
TableViewController *tableViewVC;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
[self.navigationController setNavigationBarHidden:YES animated:YES];
tableViewVC = [self.storyboard instantiateViewControllerWithIdentifier:#"TableViewController"];
mapViewVC = [self.storyboard instantiateViewControllerWithIdentifier:#"TopChildVC"];
[self addChildViewController:tableViewVC];
[tableViewVC.view setFrame:CGRectMake(0.0f,
0.0f,
self.safeArea.frame.size.width,
self.safeArea.frame.size.height/2)];
[self.bottomCont addSubview:tableViewVC.view];
[tableViewVC didMoveToParentViewController:self];
[self addChildViewController:mapViewVC];
[mapViewVC.view setFrame:CGRectMake(0.0f,
0.0f,
self.safeArea.frame.size.width,
self.safeArea.frame.size.height/2)];
[self.topCont addSubview:mapViewVC.view];
[mapViewVC didMoveToParentViewController:self];
}
#end
I just like to play with coding for a hobby, so probably a noob question;
I have a simple storyboard for MacOS with 2 views. Both have there own classes (main class and subclass). How can I control a outlet in the subclass from the main class?
for example
I have a button (IBAction) in the mainclass and a textfield (IBOutlet) in the subclass. I want to set the stringvalue for the textfield with a click on the button in main.
I have searched a lot last days but just don't get it. (or just need a push in the right direction)
EDIT after JingJingTao's answer:
I used the control-drag function to open the second window.
I tried the code JingJingTao gives, but the textfield doesn't respond to the action.
My classes look like this now:
ViewController.h
#import <Cocoa/Cocoa.h>
#interface ViewController : NSViewController
- (IBAction)newText:(id)sender;
#end
ViewController.m
#import "ViewController.h"
#import "ViewController2.h"
#interface ViewController ()
#property (nonatomic) ViewController2 *subclass;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (void)setRepresentedObject:(id)representedObject {
[super setRepresentedObject:representedObject];
}
- (void)newText:(id)sender {
self.subclass.textField.stringValue = #"button pressed";
}
#end
ViewController2.h
#import "ViewController.h"
#interface ViewController2 : ViewController
#property (nonatomic) IBOutlet NSTextField *textField;
#end
ViewController2.m
#import "ViewController2.h"
#interface ViewController2 ()
#end
#implementation ViewController2
- (void)viewDidLoad {
[super viewDidLoad];
}
#end
Update:
I've attached two screenshots of what it looks like in the storyboard for the first suggestion,
1) Add a view to your ViewController, set the class at the top right to 'YourView', 'YourView' is a just an NSView, add a textfield to it and hook it up.
2) Add YourView as a property to your ViewController, i.e. #property (nonatomic) IBOutlet NSView *yourView; and hook it up.
Let me know if there are any issues.
You just need to put the textfield in the public interface of your subclass, so you can access it in your main class, although it does sound like you're using inheritance and I don't think you need to but that's another topic :D.
Example:
In MainClassViewController.m
#interface MainClassViewController ()
#propert (nonatomic) Subclass *subclass;
#end
#implementation MainClassViewController
// I guess you already add your subclass to the main viewcontroller because they display on the same screen.
- (void)yourButtonTapMethod {
self.subclass.textfield.text = #"Your value";
}
In Subclass.h
#interface Subclass : NSObject
#property (nonatomic) IBOutlet UITextfield *textfield;
I use Cocoa Touch instead of Cocoa, so maybe it's NSTextfield for you. Please let me know if this does not answer your question, good luck.
what I'm basically trying to make is a very simple program that can switch back and forth between 2 views on a single window.
When the program loads there is a window with a custom view that contains a login button. When clicked, the view changes to a second custom view that contains a label and a logout button. I have this much working.
What I can't figure out is how to get the logout button to bring me back to the first view.
Here is the code for the AppDelegate class where i have the button method to switch the view:
header:
#import <Cocoa/Cocoa.h>
#interface AppDelegate : NSObject <NSApplicationDelegate>
#property (weak) IBOutlet NSWindow *window;
#property (weak) IBOutlet NSView *loginView;
- (IBAction)loginButtonClicked:(id)sender;
#end
implementation:
#import "AppDelegate.h"
#import "myCustomView.h"
#implementation AppDelegate
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
// Insert code here to initialize your application
}
- (void)applicationWillTerminate:(NSNotification *)aNotification {
// Insert code here to tear down your application
}
- (IBAction)loginButtonClicked:(id)sender {
[_loginView removeFromSuperview];
myCustomView *new = [[myCustomView alloc]initWithNibName:#"myCustomView" bundle:nil];
[[[self window]contentView]addSubview:[new view]];
}
#end
This is the code for my custom class that is a subclass of NSViewController.
header:
#import <Cocoa/Cocoa.h>
#class AppDelegate;
#interface myCustomView : NSViewController
#property (strong) IBOutlet NSView *logoutView;
- (IBAction)logoutButtonClicked:(id)sender;
#end
implementation:
#import "myCustomView.h"
#implementation myCustomView
- (void)viewDidLoad {
[super viewDidLoad];
// Do view setup here.
}
- (IBAction)logoutButtonClicked:(id)sender {
[_logoutView removeFromSuperview];
myCustomView *newController = [[myCustomView alloc]initWithNibName:#"MainMenu" bundle:nil];
[[[self window]contentView]addSubView:[newController view]];
//this does not work. No visible #interface for 'myCustomClass' declares the selector 'window'
}
#end
The button method to go back to the login page is where I'm stuck. Even though I've added the header file for AppDelegate into myCustomClass I cannot use the instance of NSWindow. What am I doing wrong here? Am I at least on the right track? any help here is greatly appreciated.
I also tried using #class instead of #import, but still can't use the instance of NSWindow from AppDelegate.
Here are the pictures of my two xib files:
[][1
UPDATE: The suggestions from Paul Patterson in his comments were very helpful, but haven't solved my problem. For now what I am doing to get my project to work is putting the buttons in the window instead of the views and then hiding them when i don't need them. This works and I can switch back and forth, however I still can't figure out how to use a button on a custom view itself to load a different view onto the same window.
I have read around, and it seems as though delegates would be really useful in my app. Unfortunately, every tutorial about protocols I have tried has failed - the delegate is not receiving the message! It would be great if someone could tell me what I'm doing wrong.
I created a really simple test app with two ViewControllers, a FirstViewController and a SecondViewController. I have set them up in container views to see the effect properly.
My Main.storyboard looks like this:
The purpose of the test app is to change the background colour of the SecondViewController when one of the buttons is pressed in the FirstViewController.
Here is FirstViewController.h:
#import <UIKit/UIKit.h>
#protocol FirstViewControllerDelegate
-(void)colourDidChange:(UIColor *)theColour;
#end
#interface FirstViewController : UIViewController{
UIButton *redButton;
UIButton *blueButton;
}
#property (nonatomic, retain) id <FirstViewControllerDelegate> delegate;
#property (nonatomic, retain) IBOutlet UIButton *redButton;
#property (nonatomic, retain) IBOutlet UIButton *blueButton;
-(IBAction)redPressed;
-(IBAction)bluePressed;
My FirstViewController.m:
#import "FirstViewController.h"
#interface FirstViewController ()
#end
#implementation FirstViewController
#synthesize redButton, blueButton;
#synthesize delegate;
-(IBAction)redPressed{
[self.delegate colourDidChange:[UIColor redColor]];
}
-(IBAction)bluePressed{
[self.delegate colourDidChange:[UIColor blueColor]];
}
-(void)viewDidLoad
{
[super viewDidLoad];
}
I think I have implemented the protocol and the calling of the delegate correctly.
Here is my SecondViewController.h:
#import <UIKit/UIKit.h>
#import "FirstViewController.h"
#interface SecondViewController : UIViewController <FirstViewControllerDelegate>
-(void)colourDidChange:(UIColor *)theColour;
And my SecondViewController.m:
-(void)colourDidChange:(UIColor *)theColour{
self.view.backgroundColor = theColour;
}
-(void)viewDidLoad
{
[super viewDidLoad];
FirstViewController *firstView = [[FirstViewController alloc]init];
firstView.delegate = self;
}
I have breakpointed the project and realised that colourDidChange: in the SecondViewController is never executed.
It would be much appreciated if someone could point out what I have done wrong, whether declaring (or conforming to) the delegate poorly or not setting the delegate the right way.
Many thanks.
I suspect that there are 2 instances of FirstViewController, one created by your storyboard and another one created in SecondViewController's viewDidLoad method.
When theFirstViewController creates SecondViewController it could set the delegate property or use an Outlet to connect them.
Note: delegate properties should not be retain, they should be assign (or weak with ARC).
You are honestly very close. Container views will call the prepareForSegue: method, so you should be initializing the second view controller's delegate in this method:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"TypeContainerViewSegueNameHere"]) {
SecondViewController *viewController = (SecondViewController *)segue.destinationViewController;
viewController.delegate = self;
}
}
This way you know that you are getting the instance of SecondViewController that will be in use. Also, you do not need to redeclare the delegate method in your SecondViewController.h file:
-(void)colourDidChange:(UIColor *)theColour;
Finally, in storyboard set the title of the container view segue to SecondViewController to whatever title you like and then copy paste that title to where 'TypeContainerViewSegueNameHere' is written above.
EDIT 1:
A typical situation would be similar to this:
#protocol ViewControllerDelegate;
#interface ViewController : UIViewController
#property (nonatomic, strong) id<ViewControllerDelegate>delegate;
#end
#protocol ViewControllerDelegate <NSObject>
- (void) delegateMethod;
#end
...
#implementation ViewController
- (void) buttonAction:(id)sender {
[self.delegate delegateMethod];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"TypeContainerViewSegueNameHere"]) {
SecondViewController *viewController = (SecondViewController *)segue.destinationViewController;
viewController.delegate = self;
}
}
#end
...
#interface SecondViewController : UIViewController <ViewControllerDelegate>
#end
...
#implementation SecondViewController
- (void)delegateMethod {
}
#end
That said, you could make your main view controller the delegate of your FirstViewController, which has the two view containers as seen in your screenschot. And then call a delegate method from the main view controller to the second view controller. Although I am curious as to why you have these two view controllers as child view controllers rather than placing a view and two buttons in one view controller.
EDIT 2:
Here is an example (written quickly and not tested). Think of it as a triangle of delegates:
#protocol FirstViewControllerDelegate;
#interface FirstViewController : UIViewController
#property (nonatomic, strong) id<FirstViewControllerDelegate>delegate;
#end
#protocol FirstViewControllerDelegate <NSObject>
- (void) firstViewControllerDelegateMethod;
#end
...
#implementation FirstViewController
- (void) buttonAction:(id)sender {
[self.delegate firstViewControllerDelegateMethod];
}
#end
...
#protocol MainViewControllerDelegate;
#interface MainViewController : UIViewController <FirstViewControllerDelegate>
#end
#protocol MainViewControllerDelegate <NSObject>
- (void) mainViewControllerDelegateMethod;
#end
...
#implementation MainViewController
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"TypeContainerViewSegueNameHere"]) {
SecondViewController *viewController = (SecondViewController *)segue.destinationViewController;
viewController.delegate = self.delegate;
}
if ([segue.identifier isEqualToString:#"TypeContainerViewSegueNameHere"]) {
FirstViewController *viewController = (FirstViewController *)segue.destinationViewController;
viewController.delegate = self;
}
}
- (void)firstViewControllerDelegateMethod {
[self.delegate mainViewControllerDelegateMethod];
}
#end
...
#interface SecondViewController : UIViewController <MainViewControllerDelegate>
#end
...
#implementation SecondViewController
- (void)mainViewControllerDelegateMethod {
}
#end
Like I said, you should think about reducing the complexity of this section of your app and consider putting all of your views in one view controller.
In my app I'm trying to pass data from the parent view to the child view. However, when I run the app the delegate method isn't being called.
Here is the code on how I implemented the custom delegate:
parent.h
#protocol SLBWallViewControllerDelegate <NSObject>
- (void) pictureToBeUploaded:(id)picture;
#end
#interface SLBWallViewController : UIViewController <UIActionSheetDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate>
- (IBAction)createPotButtonPressed:(id)sender;
#property (weak, nonatomic) id <SLBWallViewControllerDelegate> delegate;
#end
parent.m
[self.delegate pictureToBeUploaded:info[UIImagePickerControllerEditedImage]];//i'm taking the pic from a uiimagepicker
child.h
#interface SLBPostViewController : UIViewController <SLBWallViewControllerDelegate>
#property (weak, nonatomic) IBOutlet UIImageView *picture;
#end
child.m
#pragma mark - Wall View Controller Delegate
- (void)pictureToBeUploaded:(id)picture{
self.picture.image = picture;
}
Is there anything wrong or missing?
Well, the problem probably (edit: confirmed in the comments) is that self.delegate is nil at that point. So you send a message to nil and nothing happens of course. What you have to do is make sure that you assign a Child instance to delegate property before trying to send the message. Something like this for example:
//...
self.delegate = //.. a 'Child' instance
//...
[self.delegate pictureToBeUploaded:info[UIImagePickerControllerEditedImage]];
//(1) In Child in .h file create one property
#property (nonatomic,strong) UIImage * someImage;
//(2) In Child in .m file override the property
-(void)setSomeImage:(UIImage *)someImage{
_someImage=someImage;
self.picture.image = self.someImage;
}
//(3) In Parent in .m file set image to child's 'someImage' property
childsObject.someImage= UIImagePickerControllerEditedImage;