Trying to open a view controller from an SKScene.
Found https://stackoverflow.com/a/20072795/1686319 very helpful, but i get an error when trying to set the delegate from the view controller.
No visible #interface for 'SKScene' declares the selector
'setDelegate:'
EABMyScene.h
#import <SpriteKit/SpriteKit.h>
#protocol EABMySceneDelegate <NSObject>
-(void)doSomething;
#end
#interface EABMyScene : SKScene {
}
#property (nonatomic, weak) id <EABMySceneDelegate> delegate;
#end
Any idea?
Update:
EABViewController.h
#import <UIKit/UIKit.h>
#import <SpriteKit/SpriteKit.h>
#protocol ViewControllerDelegate <NSObject>
-(void) openTweetSheet;
#end
#interface EABViewController : UIViewController <ViewControllerDelegate>
#end
EABViewController.m
#import "EABViewController.h"
#import "EABMyScene.h"
#implementation EABViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Configure the view.
SKView * skView = (SKView *)self.view;
skView.showsFPS = YES;
skView.showsNodeCount = YES;
// Create and configure the scene.
SKScene * scene = [EABMyScene sceneWithSize:skView.bounds.size];
scene.scaleMode = SKSceneScaleModeAspectFill;
[scene setDelegate:self];
// Present the scene.
[skView presentScene:scene];
}
-(void)openTweetSheet
{
NSLog(#"Open Tweet Delegate Method");
}
EABMyScene.h
#import <SpriteKit/SpriteKit.h>
#interface EABMyScene : SKScene {
}
#property (nonatomic, weak) id <ViewControllerDelegate> delegate;
#end
Error: No visible #interface for 'SKScene' declares the selector 'setDelegate:'
Class SKScene does not have a property named delegate, so the statement
[scene setDelegate:self];
produced the compiler error. To fix this issue, cast scene to your SKScene subclass EABMyScene:
[(EABMyScene *)scene setDelegate:self];
Related
I have a little trouble with my delegate example. I created a very simple code to learn how delegates work. I know that my delegate not will be called but i can't figure out why?
So here is the complete code. Please tell me what i do wrong. It is really important for me to understand the error in this code.
First Viewcontroller: h.file
#import <UIKit/UIKit.h>
#protocol ViewControllerDelegate;
#interface ViewController : UIViewController
#property (nonatomic, retain) id<ViewControllerDelegate> delegate;
#end
#protocol ViewControllerDelegate <NSObject>
- (void)transfer:(ViewController *)data number:(NSUInteger)value;
#end
First Viewcontroller: m.file
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize delegate;
- (void)viewDidLoad
{
[super viewDidLoad];
if ([delegate respondsToSelector:#selector(transfer:number:)]){
[delegate transfer:self number:65];
NSLog(#"delegate called");
}
[delegate transfer:self number:65]; //Try to call without if-statement.
}
#end
SecondViewcontroller: h.file
#import <UIKit/UIKit.h>
#import "ViewController.h"
#interface SecondViewController : UIViewController <ViewControllerDelegate>
#end
SecondViewcontroller: m.file
#import "SecondViewController.h"
#interface SecondViewController ()
#end
#implementation SecondViewController
- (void)transfer:(ViewController *)data number:(NSUInteger)value
{
NSLog(#"received information from ViewController");
}
- (void)viewDidLoad
{
[super viewDidLoad];
ViewController *viewcontroller = [[ViewController alloc] init];
viewcontroller.delegate = self;
}
#end
In the storyboard i use two container views so both ViewControllers will shown.
Your current code is fine. The problem appears to be that you are never loading the view controllers view(s) so the viewDidLoad method isn't being called.
To test, push the viewcontroller, or just request viewcontroller.view.
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.
I'm very new to AVFoundation and QuartzCore development and I'm having troubles with CALayers. I'm sorry if this is a silly problem.
Here's my code:
.h
#import <Cocoa/Cocoa.h>
#import <AVFoundation/AVFoundation.h>
#import <QuartzCore/QuartzCore.h>
#interface Document : NSPersistentDocument
{
AVPlayer *player;
AVPlayerLayer *playerLayer;
NSView *playerView;
}
#property AVPlayerLayer *playerLayer;
#property AVPlayer *player;
#property IBOutlet NSView *playerView;
#end
.m
#import "Document.h"
#implementation Document
#synthesize playerView;
#synthesize player;
#synthesize playerLayer;
- (id)init
{
self = [super init];
if (self) {
}
return self;
}
- (NSString *)windowNibName
{
return #"Document";
}
- (void)windowControllerDidLoadNib:(NSWindowController *)aController
{
[super windowControllerDidLoadNib:aController];
[[aController window] setMovableByWindowBackground:YES];
// HERE the layer is nill, and I don't understand why it's not getting initialized?!
[[[self playerView] layer] setBackgroundColor:CGColorGetConstantColor(kCGColorBlack)];
}
+ (BOOL)autosavesInPlace
{
return YES;
}
#end
Any kind of help is very appreciated!
If the layer is nil, you should start by suspecting that its parent playerView is nil. Is it? If so, you probably haven't hooked up the outlet in the nib. (I see you have declared playerView as an outlet in your code, but that doesn't mean you've configured the nib correctly.)
I'm studing protocol and delegates using an Example! When I try to re create this example I notice that this condition is not respected:
if([delegate respondsToSelector:#selector(amountEntered:)]) {blabla}
where is the mistake? Scripts:
First View .h
#import <UIKit/UIKit.h>
#import "EnterAmountViewController.h"
#interface DelegateExampleViewController : UIViewController <EnterAmountDelegate>{
IBOutlet UILabel *amountLabel;
}
-(IBAction)changeAmountPressed;
#end
First View .m
#import "DelegateExampleViewController.h"
#implementation DelegateExampleViewController
-(IBAction)changeAmountPressed
{
EnterAmountViewController * enterAmountVC = [[EnterAmountViewController alloc]init];
enterAmountVC.delegate = self;
}
-(void)amountEntered:(NSInteger)amount
{
amountLabel.text = [NSString stringWithFormat:#"%i" , amount];
}
#end
Second View .h
#import <UIKit/UIKit.h>
#protocol EnterAmountDelegate <NSObject>
-(void)amountEntered:(NSInteger)amount;
#end
#interface EnterAmountViewController : UIViewController {
IBOutlet UITextField *amountTextField;
id<EnterAmountDelegate> delegate;
}
-(IBAction)savePressed;
#property(nonatomic,retain) id<EnterAmountDelegate> delegate;
#end
Second View .m
#import "EnterAmountViewController.h"
#import "DelegateExampleViewController.h"
#implementation EnterAmountViewController
#synthesize delegate;
- (void)viewDidLoad {
[super viewDidLoad];
amountTextField.text = #"";
[amountTextField becomeFirstResponder];
}
-(IBAction)savePressed
{
if([delegate respondsToSelector:#selector(amountEntered:)])
{
[delegate amountEntered:[amountTextField.text intValue]];
NSLog(#"rugg");
}
}
#end
Thanks in advance!
In the method:
-(IBAction)changeAmountPressed
{
EnterAmountViewController * enterAmountVC = [[EnterAmountViewController alloc]init];
enterAmountVC.delegate = self;
}
you are creating an instance of EnterAmountViewController on the stack as a local variable. This variable will be inaccessible at the end of the scope. So, when you execute savePressed you are doing it on a different object where you did not set delegate.
In other words, when you check
if([delegate respondsToSelector:#selector(amountEntered:)])
it returns NO because delegate is nil...
The correct way to set the delegate is using the prepareForSegue mechanism:
#implementation DelegateExampleViewController
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
[(EnterAmountViewController*)segue.destinationViewController setDelegate:self];
}
...
You do not need the changeAmountPressed method nor the relative binding.
I can't get why I can't set delegate. I'm using UINavigationController to switch between two views. Here is my code
SecondViewProtocol.h
#import <Foundation/Foundation.h>
#protocol SecondViewProtocol <NSObject>
#required
-(void)textFieldDidChange:(NSString *)data;
#end
SecondView.h
#import <UIKit/UIKit.h>
#import "SecondViewProtocol.h"
#interface SecondView : UIViewController
#property (nonatomic, retain) id<SecondViewProtocol>delegate;
#end
SecondView.m
#synthesize delegate = _delegate;
.......
-(IBAction)textFieldReturn:(id)sender
{
[[self delegate] textFieldDidChange:[self.textField text]];
}
.......
I have imported SecondViewProtocol.h in FirstView.h
FirstView.m
....
SecondView *secondView = [[SecondView alloc]init];
secondView.delegate = self;
....
Here I get Assigning to id from incompatible type FirtView.
What is wrong here ?
First of all, delegate property should be declared as assign, not retain. You should never retain delegates.
Second, FirstView should conform to SecondViewProtocol like the following.
#interface FirstView: UIViewController <SecondViewProtocol>