I'm subclassing NSTextField
MultiTextField.h
#import <AppKit/AppKit.h>
#interface MultiTextField : NSTextField {
id storedObject;
}
#property (nonatomic, retain) id storedObject;
#end
MultiTextField.m
#import "MultiTextField.h"
#implementation MultiTextField
#synthesize storedObject;
#end
to store a pointer to an object, which I want to "rename".
I made this textfield editable and have a delegate which listens to controlTextDidChange: and works fine:
- (void)controlTextDidChange:(NSNotification *)aNotification {
NSTextView *textView = [[aNotification userInfo] objectForKey:#"NSFieldEditor"];
NSString *theString = [[textView textStorage] string];
if([theString length] > 0 ) {
MyObject *theObject = ???; // I need access to the MultiTextField.storedObject!
[theObject setName:theString];
}
}
the only problem is that I can't access the storedObject (see comment in the if-block).
So how do I access that storedObject?
Try this:
MyObject *theObject = [[aNotification object] storedObject];
Related
How do I set the array in my model-class ValueItem with the content of an NSArrayControllerin my AppDelegate class:
#interface AppDelegate : NSObject <NSApplicationDelegate>
{
ValueItem *vi;
}
and:
#implementation AppDelegate
{
ValueItem *array = [[ValueItem alloc]init];
[array setValueArray:[outArrayController arrangedObjects]];
NSArray *testArray2 = vi.valueArray; // !!!getter or setter doesn't work!!!
NSLog(#"test array 2 is:%#", testArray2);
}
NSLog returns NULL. What do I miss here?
(valueArray is initialized with #property and #synthesize)
ValueItem.h:
#import <Foundation/Foundation.h>
#interface ValueItem : NSObject
{
NSNumber *nomValue;
NSNumber *tolerancePlus;
NSNumber *toleranceMinus;
NSMutableArray *valueArray;
}
#property (readwrite, copy) NSNumber *nomValue;
#property (readwrite, copy) NSNumber *tolerancePlus;
#property (readwrite, copy) NSNumber *toleranceMinus;
#property (nonatomic, retain) NSMutableArray *valueArray;
#end
ValueItem.m:
#import "ValueItem.h"
#implementation ValueItem
#synthesize nomValue, tolerancePlus, toleranceMinus;
#synthesize valueArray;
-(NSString*)description
{
return [NSString stringWithFormat:#"nomValue is: %# | tolerancePlus is: %# | toleranceMinus is: %#", nomValue, tolerancePlus, toleranceMinus];
}
#end
Solution: Need to make sure you're dealing with the AppDelegate's vi property:
// We need to make sure we're manipulating the AppDelegate's vi property!
self.vi = [[ValueItem alloc]init];
[vi setValueArray:[outArrayController arrangedObjects]];
NSArray *testArray2 = vi.valueArray; // !!!getter or setter doesn't work!!!
NSLog(#"test array 2 is:%#", testArray2);
Explanation :
On the first two lines you were manipulating the array ValueItem variable, then attempting to set testArray2 to the value of the uninitialized vi ValueItem variable.
// This is a new variable, unrelated to AppDelegate.vi
ValueItem *array = [[ValueItem alloc]init];
[array setValueArray:[outArrayController arrangedObjects]];
// Here, AppDelegate.vi hasn't been initialized, so valueArray *will* be null!
NSArray *testArray2 = vi.valueArray;
NSLog(#"test array 2 is:%#", testArray2);
The location is working but the title isn't appearing, most strange.
location.latitude = (double) 51.501468;
location.longitude = (double) -0.141596;
// Add the annotation to our map view
MapViewAnnotation *newAnnotation = [[MapViewAnnotation alloc] initWithTitle:#"ABC" andCoordinate:location];
[self.mapView addAnnotation:newAnnotation];
// [newAnnotation release];
MapViewAnnotation.h
#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
#interface MapViewAnnotation : NSObject <MKAnnotation> {
NSString *title;
CLLocationCoordinate2D coordinate;
}
#property (nonatomic, copy) NSString *title;
#property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
- (id)initWithTitle:(NSString *)ttl andCoordinate:(CLLocationCoordinate2D)c2d;
#end
and MapViewAnnotation.m
#import "MapViewAnnotation.h"
#implementation MapViewAnnotation
#synthesize title, coordinate;
- (id)initWithTitle:(NSString *)ttl andCoordinate:(CLLocationCoordinate2D)c2d {
title = ttl;
coordinate = c2d;
return self;
}
#end
[newAnnotation release] is remmed out to keep the ARC happy :-)
Any ideas?
This did the trick:
[mapView selectAnnotation:newAnnotation animated:YES];
previously the title would only show if you clicked on the Pin.
you call annotation delegates refer this link, mapkit-example-in-iphone
That code looks fine (except for the non-standard implementation of the init method).
The most likely reason the title (callout) isn't appearing is that in your viewForAnnotation delegate method, you are not setting canShowCallout to YES (it defaults to NO).
In the viewForAnnotation delegate method, after you create the MKAnnotationView, set canShowCallout to YES.
Unrelated to the title/callout not showing, the init method in your MapViewAnnotation class should be implemented like this:
- (id)initWithTitle:(NSString *)ttl andCoordinate:(CLLocationCoordinate2D)c2d {
self = [super init];
if (self) {
title = ttl;
coordinate = c2d;
}
return self;
}
My objective is to show in a label the text of an object of a custom class called Files. Here is Files.h :
#import <Foundation/Foundation.h>
#interface Files : NSObject
#property (nonatomic, retain) NSString *title;
#property (nonatomic, retain) NSString *text;
#end
This is Files.m :
#import "Files.h"
#implementation Files
#dynamic title;
#dynamic text;
#end
Here is the .h file of my app. the label is called trackName:
#import <UIKit/UIKit.h>
#import "Files.h"
#interface FirstViewController : UIViewController
{
Files *plainpalais;
}
#property (weak, nonatomic) IBOutlet UILabel *trackName;
-(Files*) chooseFile;
#end
This is the .m file of the app:
#import "FirstViewController.h"
#interface FirstViewController ()
#end
#implementation FirstViewController
#synthesize trackName;
-(Files*)chooseFile
{
return plainpalais;
}
- (void)viewDidLoad
{
[super viewDidLoad];
plainpalais.text=#"hello";
plainpalais.title=#"plainpalais";
trackName.text=plainpalais.title;
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
[self setTrackName:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation
{
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
} else {
return YES;
}
}
#end
The problem is that the label trackName doesn't show plainpalais...
Thanks for help !
PS: I'm a beginner so this is probably a basic mistake.
You have used #dynamic in your Files.m implementation which tells the compiler that you'll provide getters/setters for these properties at a later time, i.e. using the Objective-C runtime.
I suspect you want to use #synthesize rather than #dynamic. For example,
#import "Files.h"
#implementation Files
#synthesize title;
#synthesize text;
#end
Also you haven't actually created a Files object in the code you have given us. The chooseFile method appears to be returning a nil object (assuming you haven't initialised plainpalais somewhere else). Perhaps you should initialise plainpalais in an init method, e.g.
- (id)init {
self = [super init];
if (self) {
plainpalias = [[Files alloc] init];
}
return self;
}
Don't forget to release this object in dealloc (if you aren't using ARC).
I'm trying to hide an object in my viewController, with code executed from a custom class, but the object is nil.
FirstViewController.h
#import <UIKit/UIKit.h>
#interface FirstViewController : UIViewController {
IBOutlet UILabel *testLabel;
}
#property (nonatomic, retain) IBOutlet UILabel *testLabel;
- (void) hideLabel;
FirstViewController.m
I synthesize testLabel and I have a function to hide it. If I call the function from viewDidAppear it works, but I want to call it from my other class. When called from the other class, testLabel is nil
#import "FirstViewController.h"
#import "OtherClass.h"
#implementation FirstViewController
#synthesize testLabel;
- (void) hideLabel {
self.testLabel.hidden=YES;
NSLog(#"nil %d",(testLabel==nil)); //here I get nil 1 when called from OtherClass
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
OtherClass *otherClass = [[OtherClass alloc] init];
[otherClass hideThem];
//[self hideLabel]; //this works, it gets hidden
}
OtherClass.h
#class FirstViewController;
#import <Foundation/Foundation.h>
#interface OtherClass : NSObject {
FirstViewController *firstViewController;
}
#property (nonatomic, retain) FirstViewController *firstViewController;
-(void)hideThem;
#end
OtherClass.m
calls the hideLabel function in FirstViewController. In my original project, (this is an example obviously, but the original project is at work) I download some data here and I want to hide my loading label and indicator when download is done
#import "OtherClass.h"
#import "FirstViewController.h"
#implementation OtherClass
#synthesize firstViewController;
-(void)hideThem {
firstViewController = [[FirstViewController alloc] init];
//[firstViewController.testLabel setHidden:YES]; //it doesn't work either
[firstViewController hideLabel];
}
Any ideas?
Your UILabel is nil because you just initialized your controller but didn't load it's view. Your controller`s IBoutlets are instantiated from the xib or storyboard automatically when you ask access to the bound view for the first time, so in order to access them you first have to load its view by some means.
EDIT (after OP comments):
Since your FirstViewController is already initialized and your OtherClass is instantiated by that controller, you could just hold a reference to it and not try to initialize a new one.
So try something like this:
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
OtherClass *otherClass = [[OtherClass alloc] init];
otherClass.firstViewController = self;
[otherClass hideThem];
}
In your OtherClass.m:
-(void)hideThem {
[self.firstViewController hideLabel];
}
I have one class that controls one window, and another class that controls a different window in the same xib, however, the second window never displays what it should.
In the first class I alloc and init the second class, then pass some information to it. In the second class it displays that data in the table view.
Yes, in the .xib I have all the connections set up correctly, I've quadruple checked. Also the code is correct, same with the connections, I've quadruple checked.
Edit: and yes, there's data in the arrays, and the classes are NSObjects.
Edit2: I kinda found the problem. For some reason, the array is filled with contents, but it's returning 0 as a count.
Edit 9000:
Here's the code:
Answer.h
#import <Cocoa/Cocoa.h>
#interface MSAnswerView : NSObject {
IBOutlet NSWindow *window;
NSArray *User;
NSArray *Vote;
NSArray *Text;
IBOutlet NSTableView *view;
IBOutlet NSTableColumn *voteCount;
IBOutlet NSTableColumn *saidUser;
IBOutlet NSTextView *body;
}
-(void)setUpWithVoteCount:(NSArray *)array User:(NSArray *)user Text:(NSArray *)text;
#property (nonatomic, retain) NSWindow *window;
#property (nonatomic, retain) NSTableView *view;
#property (nonatomic, retain) NSTableColumn *voteCount;
#property (nonatomic, retain) NSTableColumn *saidUser;
#property (nonatomic, retain) NSTextView *body;
#end
.m
#import "MSAnswerView.h"
#implementation MSAnswerView
#synthesize view;
#synthesize voteCount;
#synthesize saidUser;
#synthesize body;
#synthesize window;
-(void)awakeFromNib
{
[view setTarget:self];
[view setDoubleAction:#selector(bodydata)];
[view reloadData];
}
-(void)setUpWithVoteCount:(NSArray *)array User:(NSArray *)user Text:(NSArray *)text
{
Vote = array;
User = user;
Text = text;
if (window.isVisible = YES) {
[view reloadData];
[view setNeedsDisplay];
}
}
-(int)numberOfRowsInTableView:(NSTableView *)aTable
{
return [User count];;
}
-(id)tableView:(NSTableView *)aTable objectValueForTableColumn:(NSTableColumn *)aCol row:(int)aRow
{
if (aCol == voteCount)
{
return [Vote objectAtIndex:aRow];
}
else if (aCol == saidUser)
{
return [User objectAtIndex:aRow];
}
else
{
return nil;
}
}
-(void)bodydata
{
int index = [view selectedRow];
[body setString:[Text objectAtIndex:index]];
}
#end
The problems in your code are numerous.
For one thing, this comparison in -setUpWithVoteCount:User:Text: is incorrect:
window.isVisible = YES
That should be the comparison operator, == not the assignment operator =.
Secondly, you are naming your ivars and methods incorrectly. Instance variables (in fact, variables of any type) should start with a lower-case letter. This is to distinguish them from class names. Check out the Apple coding guidelines.
I'd also suggest that a name like text is a bad name for a variable that stores a collection like an NSArray. Instead, you should name it something like textItems so it's clear that the variable represents a collection and not a single string.
Also, the class itself is poorly named. You have called it MSAnswerView but it's not a view, it's some type of window controller. At the very least call it MSAnswerWindowController. Better still would be to make it a subclass of NSWindowController and make it File's Owner in its own nib. This is the standard pattern for window controllers.
Your method -setUpWithVoteCount:User:Text: should really be an initializer:
- initWithVoteCount:user:text:
That way it's clear what it's for and that it should be called once at object creation time.
The main problem, however, is that you're not retaining the values that you pass in to your setup method. That means that if no other object retains a reference to them, they will go away at some indeterminate point in the future. If you access them at a later time, you will crash or at the very least receive bad data, which is what's occurring.
Of course, you must also add a -dealloc method in this case to ensure you release the objects when you're finished with them.
Putting all those suggestions together, your class should really look something like this:
MSAnswerWindowController.h:
#import <Cocoa/Cocoa.h>
//subclass of NSWindowController
#interface MSAnswerWindowController : NSWindowController <NSTableViewDataSource>
{
//renamed ivars
NSArray *users;
NSArray *voteCounts;
NSArray *textItems;
IBOutlet NSTableView *view;
IBOutlet NSTableColumn *voteCount;
IBOutlet NSTableColumn *saidUser;
IBOutlet NSTextView *body;
}
//this is now an init method
- (id)initWithVoteCounts:(NSArray *)someVoteCounts users:(NSArray *)someUsers textItems:(NSArray *)items;
//accessors for the ivars
#property (nonatomic, copy) NSArray* users;
#property (nonatomic, copy) NSArray* voteCounts;
#property (nonatomic, copy) NSArray* textItems;
#property (nonatomic, retain) NSWindow *window;
#property (nonatomic, retain) NSTableView *view;
#property (nonatomic, retain) NSTableColumn *voteCount;
#property (nonatomic, retain) NSTableColumn *saidUser;
#property (nonatomic, retain) NSTextView *body;
#end
MSAnswerWindowController.m:
#import "MSAnswerWindowController.h"
#implementation MSAnswerWindowController
//implement the init method
- (id)initWithVoteCounts:(NSArray*)someVoteCounts users:(NSArray*)someUsers textItems:(NSArray*)items
{
//this is an NSWindowController, so tell super to load the nib
self = [super initWithWindowNibName:#"MSAnswerWindow"];
if(self)
{
//copy all the arrays that are passed in
//this means we hold a strong reference to them
users = [someUsers copy];
voteCounts = [someVoteCounts copy];
textItems = [items copy];
}
return self;
}
//make sure we deallocate the object when done
- (void)dealloc
{
self.users = nil;
self.voteCounts = nil;
self.textItems = nil;
[super dealloc];
}
//this is called when the window first loads
//we do initial window setup here
- (void)windowDidLoad
{
[view setTarget:self];
[view setDataSource:self];
[view setDoubleAction:#selector(bodydata)];
}
//this is called when the view controller is asked to show its window
//we load the table here
- (IBAction)showWindow:(id)sender
{
[super showWindow:sender];
[view reloadData];
}
- (NSInteger)numberOfRowsInTableView:(NSTableView*)aTable
{
return [users count];
}
- (id)tableView:(NSTableView*)aTable objectValueForTableColumn:(NSTableColumn*)aCol row:(NSInteger)aRow
{
if (aCol == voteCount)
{
return [voteCounts objectAtIndex:aRow];
}
else if (aCol == saidUser)
{
return [users objectAtIndex:aRow];
}
return nil;
}
- (void)bodydata
{
NSInteger index = [view selectedRow];
[body setString:[textItems objectAtIndex:index]];
}
#synthesize users;
#synthesize voteCounts;
#synthesize textItems;
#synthesize view;
#synthesize voteCount;
#synthesize saidUser;
#synthesize body;
#end