I have looked at the documentation yet I still haven't successfully implemented a CollectionView. Here is what I have.
My KVO/KVC compliant NSMutableArray.
#import <Foundation/Foundation.h>
#import "ProjectModel.h"
#interface KVOMutableArray : NSMutableArray
#property NSMutableArray* projectModelArray;
- (id)init;
- (void)insertObject:(ProjectModel *)p inProjectModelArrayAtIndex:(NSUInteger)index;
- (void)removeObjectFromProjectModelArrayAtIndex:(NSUInteger)index;
- (void)setProjectModelArray:(NSMutableArray *)a;
- (NSArray*)projectModelArray;
#end
ProjectModel.h file:
#import <Foundation/Foundation.h>
#interface ProjectModel : NSObject {
NSString *applicationName;
NSString *projectPath;
NSImage *image;
}
#property(retain, readwrite) NSImage *image;
#property(retain, readwrite) NSString *applicationName;
#property(retain, readwrite) NSString *projectPath;
#end
ProjectModel.m:
#import "ProjectModel.h"
#implementation ProjectModel
#synthesize image;
#synthesize projectPath;
#synthesize applicationName;
- (id)init {
self = [super init];
image = [NSImage imageNamed:#"xcodeproject.png"];
return self;
}
#end
I also put #property KVOMutableArray *projectsManager; in my AppDelegate.h file and
projectsManager = [[KVOMutableArray alloc] init];
ProjectModel *pm1 = [[ProjectModel alloc] init];
pm1.projectPath = #"path here";
pm1.applicationName = #"Crittercism Example App";
[projectsManager addObject: pm1];
in my awakeFromNib method.
I get the following exception and then it terminates:
[<NSCollectionViewItem 0x1001c2eb0> addObserver:<NSAutounbinderObservance 0x1001e2a20> forKeyPath:#"representedObject.applicationName" options:0x0 context:0x103111690] was sent to an object that is not KVC-compliant for the "representedObject" property.
Not sure what is the problem. Any help is appreciated I know I've written a lot here.
Edit--
The problem seems to be that it can't find representObject.image or any of the other properties for that matter. How can I fix this?
It worked after I implemented these methods (turns out the documentation lied about only needing the 4 methods they suggested there):
#import <Foundation/Foundation.h>
#import "ProjectModel.h"
#interface KVOMutableArray : NSMutableArray {
NSMutableArray *projectModelArray;
}
#property (readonly, copy) NSMutableArray* projectModelArray;
- (id)init;
- (void)insertObject:(ProjectModel *)p;
- (void)insertObject:(id)p inProjectModelArrayAtIndex:(NSUInteger )index;
- (void)removeObjectFromProjectModelArrayAtIndex:(NSUInteger)index;
- (void)setProjectModelArray:(NSMutableArray *)array;
- (NSUInteger)countOfProjectModelArray;
- (id)objectInProjectModelArrayAtIndex:(NSUInteger)index;
- (void)insertProjectModelArray:(NSArray *)array atIndexes:(NSIndexSet *) indexes;
- (NSArray *)projectModelArrayAtIndexes:(NSIndexSet *)indexes;
- (NSArray*)projectModelArray;
- (void)removeProjectModelArrayAtIndexes:(NSIndexSet *)indexes;
- (NSUInteger)count;
- (void)insertObject:(id)object atIndex:(NSUInteger)index;
#end
Set the mode of your array controller Class and the class name to ProjectModel
Related
I would like to set an text in the text field in another class and get it from another class. This is something what I want, but it does not work. Can you please help me. Thank you!
aaa.h
#import <Cocoa/Cocoa.h>
#interface aaa : NSImageView {
IBOutlet NSTextField *message;
}
#property (nonatomic, retain) IBOutlet NSTextField *message;
#end
aaa.m
#import "aaa.h"
#import "bbb.h"
#implementation aaa
#synthesize message;
- (void)awakeFromNib {
// [message setStringValue:#"ok, this works!"]; //but i don't want it from here
[self hello];
}
#end
bbb.h
#import <Foundation/Foundation.h>
#interface NSObject (bbb)
- (void)hello;
#end
bbb.m
#import "bbb.h"
#import "aaa.h"
#implementation NSObject (bbb)
- (void)hello {
aaa *obj = [[[aaa alloc] init] autorelease];
[obj.message setStringValue:#"This doesn't work :("]; // set text here, dont work.
NSLog(#"TEST: %#", [obj.message stringValue]);
}
#end
You are using category, so first thing it is used for extending the functionality of existing class. So you cannot set textfield value inside category. But else you can add some functonality after extracting the value. So you have to pass the value inside the category first. Try like this below:
- (void)awakeFromNib {
NSString *resultString=[self hello:#"This doesn't work :("];
[message setStringValue:resultString];
}
#end
#interface NSObject (bbb)
- (NSString*)hello:(NSString*)yourString;
#end
#implementation NSObject (bbb)
- (NSString*)hello:(NSString*)yourString {
return yourString;
}
#end
I've declared a property called Squad, but when I send [self getSquad] I get "no visible #interface for SquadViewController declares the selector 'getSquad'".
SquadViewController.h:
#import "FlipsideViewController.h"
#import "Squad.h"
#interface SquadViewController : UIViewController <FlipsideViewControllerDelegate, UIPopoverControllerDelegate>
#property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;
#property (strong, nonatomic) UIPopoverController *flipsidePopoverController;
#property (nonatomic, retain) IBOutlet UILabel *squadNameLabel;
#property Squad *squad;
- (IBAction)updateTitleWithName:(id)sender;
#end
SquadViewController.m:
#import "SquadViewController.h"
#interface SquadViewController ()
#end
#implementation SquadViewController
#synthesize squadNameLabel;
#synthesize squad;
...
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
if (![self getSquad]) //<--THIS IS WHERE THE ERROR IS
{
[self setSquad:[Squad squadWithName:#"New Squad"]]; //<-- NOT HERE, SO THE SETTER SEEMS TO EXIST
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
...
I thought that "#synthesize squad" would generate getSquad and setSquad, so I'm confused.
Here's the code for Squad, if for some reason that I don't get it's relevant (I'm new to Objective C, I still find it very confusing (I'm from a java background)):
Squad.h:
#import "SquadBuilderObject.h"
#interface Squad : NSObject
#property NSString *name;
+ (id) squadWithName:(NSString*)name;
#end
Squad.m:
#import "Squad.h"
#implementation Squad
#synthesize name;
+ (id)squadWithName:(NSString *)name
{
Squad *newSquad = [[Squad alloc] init];
[newSquad setName:name];
return newSquad;
}
#end
The standard getter for a property named squad is squad, not getSquad.
The "get…" nomenclature is typically reserved for things returned by reference (e.g. - (BOOL)getSquad:(Squad **)outSquad).
I'm new to xCode. I'm using xCode 4.6 and I don't understand how xcode instantiates objects fully.
I thought that if you declare the object as a property in the .h file it automatically alloc and init it. the only way I could get my code to work is to do the alloc and init on the property file. I included my sample code below, but can anyone tell me if this is the right way to do this?
#import <Foundation/Foundation.h>
#interface Person : NSObject
#property (nonatomic, strong) NSString *name;
#property (nonatomic) int age;
#end
#import "Person.h"
#implementation Person
#end
#import <UIKit/UIKit.h>
#import "Person.h"
#interface ViewController : UIViewController
#property (strong, nonatomic) Person *person;
#property (weak, nonatomic) IBOutlet UILabel *lblDisplay;
- (IBAction)btnChangeLabel:(id)sender;
#end
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
_person = [[Person alloc]init];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)btnChangeLabel:(id)sender {
[_person setName:#"Rich"];
[_person setAge:50];
_lblDisplay.text = [NSString stringWithFormat:#"%# is %d years old.",_person.name,_person.age];
}
#end
You're doing the right thing, except in your btnChangeLabel method, refer to your properties via:
self.person.name = #"Rich";
self.person.age = 50;
_lblDisplay.text = [NSString stringWithFormat:#"%# is %d years old.",self.person.name,self.person.age];
The only time you want to use the underlying variables "_person" is when you need to allocate the space for them. The rest of the time, you'll use their accessors (getters and setters; which is what the "self.person.name =" thing is doing). This way the compiler will know to do ARC-style releases and retains automagically.
I recently started learning Objective-C and Cocos-2D. I tried to define my own method for automating the creation of sprites.
I added my own class where I'll create other automation methods as well. Anyhow my .h file looks like this:
#import <Foundation/Foundation.h>
#import "cocos2d.h"
#interface ActionsClass : CCNode {
}
#property (nonatomic, strong) CCSprite* createSprite;
#property (nonatomic, strong) CCSprite* spriteName;
#property (nonatomic, strong) NSString* pngName;
#property (nonatomic) CGPoint* spriteCoordinate;
- (CCSprite *)createSprite: (CCSprite *)spriteName: (NSString *)pngName: (CGPoint *)spriteCoordinate;
#end
And the .m is:
#import "ActionsClass.h"
#implementation ActionsClass
#synthesize createSprite = _createSprite;
#synthesize spriteName = _spriteName;
#synthesize pngName = _pngName;
#synthesize spriteCoordinate = _spriteCoordinate;
- (CCSprite *)createSprite: (CCSprite *)spriteName: (NSString *)pngName: (CGPoint *)spriteCoordinate
{
if (!_createSprite)
{
_createSprite = [[CCSprite alloc] init];
_spriteName = [CCSprite spriteWithFile:_pngName];
_spriteName.position = ccp(_spriteCoordinate->x, _spriteCoordinate->y);
[self addChild:_spriteName];
}
return _createSprite;
}
#end
In the main .m file where I want to call the method:
[self createSprite: saif: #"saif.png": ccp(100,100)];
This would give the warning that xcode didn't find the instance method createSprite and defaults it to id
Thanks a lot and sorry if the font or the formatting of the question aren't super neat.
Your method declaration is wrong, so you wont be able to call it.
It should be:
- (CCSprite *)createSprite:(CCSprite *)spriteName pngName:(NSString *)pngName coord:(CGPoint *)spriteCoordinate;
And called like:
[self createSprite:someSprite pngName:somePNGName coord:someCoord];
Edit: I didn't see that you were trying to call this from another class. To do that you will need to import the ActionsClass header file, and call this method on an instance of ActionsClass, e.g.
ActionsClass *actionsClassObject = [[ActionsClass alloc] init];
[actionsClassObject createSprite:someSprite pngName:somePNGName coord:someCoord];
this is a follow-up question to my last one here: iOS: Initialise object at start of application for all controllers to use .
I have set my application up as follows (ignore the DB Prefix):
DBFactoryClass // Built a DataManaging Object for later use in the app
DBDataModel // Is created by the factory, holds all data & access methods
DBViewControllerA // Will show some of the data that DBDataModel holds
moreViewControllers that will need access to the same DBDataModel Object
i will go step by step through the application, and will then in the end post the error message i get when building.
AppDelegate.h
#import "DBFactoryClass.h"
AppDelegate.m
- (BOOL)...didFinishLaunching...
{
DBFactoryClass *FACTORY = [[DBFactoryClass alloc ]init ];
return YES;
}
DBFactoryClass.h
#import <Foundation/Foundation.h>
#import "DBDataModel.h"
#interface DBFactoryClass : NSObject
#property (strong) DBDataModel *DATAMODEL;
#end
DBFactoryClass.m
#import "DBFactoryClass.h"
#implementation DBFactoryClass
#synthesize DATAMODEL;
-(id)init{
self = [super init];
[self setDATAMODEL:[[DBDataModel alloc]init ]];
return self;
}
#end
ViewControllerA.h
#import <UIKit/UIKit.h>
#import "DBDataModel.h"
#class DBDataModel;
#interface todayViewController : UIViewController
#property (strong)DBDataModel *DATAMODEL;
#property (weak, nonatomic) IBOutlet UILabel *testLabel;
#end
ViewControllerA.m
#import "todayViewController.h"
#implementation todayViewController
#synthesize testLabel;
#synthesize DATAMODEL;
- (void)viewDidLoad
{
todaySpentLabel.text = [[DATAMODEL test]stringValue];
}
#end
DBDataModel.h
#import <Foundation/Foundation.h>
#interface DBDataModel : NSObject
#property (nonatomic, retain) NSNumber* test;
#end
DBDataModel.m
#import "DBDataModel.h"
#implementation DBDataModel
#synthesize test;
-(id)init{
test = [[NSNumber alloc]initWithInt:4];
return self;
}
#end
when i build it, i get the following error: EXC_BAD_ACCESS in this line:
#synthesize DATAMODEL;
of DBFactoryClass.m
What #synthesize does is to automatically generate implementations of the accessors for a property. EXC_BAD_ACCESS there means that you're accessing garbage when one of the accessors is executed.
That's probably happening here:
[self setDATAMODEL:[[DBDataModel alloc]init ]];
Make sure that DBDataModel's implementation of init actually returns a legitimate object.
As far as I can tell, your DBFactoryClass class is never stored anywhere, and therefore released right after the allocation if you use ARC (Since you use the strong keyword I assumed you do).
- (BOOL)...didFinishLaunching... {
DBFactoryClass *FACTORY = [[DBFactoryClass alloc ]init ];
// If you use ARC this might be released right afterwards
return YES;
}
If you want the factory to be a singleton, use something like this
+ (id)sharedInstance {
static dispatch_once_t once;
static MyFoo *instance;
dispatch_once(&once, ^{
instance = [[self alloc] init];
});
return instance;
}