Objects string value is not set correctly - objective-c

Question

I'm writing a small project time management program for myself and have run into a problem which has confounded me.
They way it's set up is that I have an object called TCObject which I use in another object called ProjectTimerController. ProjectTimerController is a NSWindowController and it has it's own NIB file.
What I'm doing is pretty straight forward. When you click a line in a NSTableView ProjectTimerController finds a TCObject which corresponds to that line. It then loads info from that TCObject into an interface where you can view and edit some stuff.
Here's a screenshot of what it looks like:
Now when I change the text in NSTextView and then press the Add button the -saveString function is called and currentSelection (which is a TCObject and represents the currently selected line) and it's notes variable is set. I know that _notes is set as the new value as NSLog function logs the correct string being in _notes when setString is run. The same, correct, string is logged in -tableViewSelectionDidChange: just before currentSelection is set as the newly selected object.
But if I select the line where I just changed the notes it just loads the same text, "Initial String" and checking _notes tells me it's "Initial String".
Thing I don't have this problem with isFinished. When the Finished check box is toggled I set the corresponding TCObjects' isFinished Boolean value to the same value as the checkbox. This the object remembers and correctly changes depending on what line I have selected.
[EDIT]
*I've added a clearer explanation here.
I click a line in the NSTableView (lets say the top one)
This loads a corresponding TCObject from the myProjects array and that object's variable are added to the Notes NSTextView box and Finished is toggled on or off.
If I now write into The Notes box and press "Add" the text there is set into that TCObject's _notes variable.
So If I click another line some other text is loaded into the Notes box. Clicking back on the top line should give me the string I just wrote into Notes in step 3. But it doesn't. _notes always seems to contain the string I set when I initialize it in the -init method.
The "Finished" checkbox works fine. When I click that the state is saved and loaded correctly when I click a line.
I know that _notes is correctly set when I press the Add button as the NSLog method in setString logs the string I have written into Notes when I press the Add button.
[/EDIT]
Here below is a barebones version of TCObject and ProjectTimerController.
//TCObject.h
#interface TCObject : NSObject
{
NSString *_notes;
Boolean _isFinished;
}
#property (retain, nonatomic) NSString *notes;
#property (nonatomic) Boolean isFinished;
#end
//TCObject.m
#import "TCObject.h"
#implementation TCObject
#synthesize notes = _notes, isFinished = _isFinished;
-(id)init{
if (self = [super init]) {
self.notes = #"Initial string";
self.isFinished = NO;
}
return self;
}
- (void)dealloc {
[_notes release]; _notes = nil;
[super dealloc];
}
-(void)setNotes:(NSString *)notes {
[notes retain];
[_notes release];
_notes = notes;
NSLog(#"Setting _notes as: %#", _notes);
}
-(NSString *)notes {
NSLog(#"Getting _notes, which is: %#", _notes);
return _notes;
}
#end
//ProjectTimerController.m
- (id)initWithWindow:(NSWindow *)window {
self = [super initWithWindow:window];
if (self)
{
myProjects = [[NSMutableArray alloc]init];
currentSelection = nil;
TCObject *newProject = [[TCObject alloc] init];
TCObject *newProject2 = [[TCObject alloc] init];
TCObject *newProject3 = [[TCObject alloc] init];
TCObject *newProject4 = [[TCObject alloc] init];
[myProjects addObject:newProject];
[myProjects addObject:newProject2];
[myProjects addObject:newProject3];
[myProjects addObject:newProject4];
}
return self;
}
-(IBAction)isFinishedToggle:(id)sender {
if(currentSelection != nil){
currentSelection.isFinished = finishedCheckBtn.state;
}
}
-(IBAction)saveString:(id)sender {
if(currentSelection != nil){
currentSelection.notes = [[notesField textStorage] string];
}
}
//delegate function for NSTableView
- (void)tableViewSelectionDidChange:(NSNotification *)aNotification {
NSInteger selectedIndex = [table selectedRow];
if(selectedIndex == -1){
return;
}
//here the correct notes string is printed
NSLog(#"curr: %i", currentSelection.notes);
currentSelection = [myProjects objectAtIndex:selectedIndex];
NSString *notesInfo = currentSelection.notes;
Boolean isFinishedInfo = currentSelection.isFinished;
[notesField setString:notesInfo];
[finishedCheckBtn setState:isFinishedInfo];
}

Answer 1

Finally found the problem. Seems that changing notes in this way:
-(IBAction)saveString:(id)sender {
if(currentSelection != nil){
currentSelection.notes = [[notesField textStorage] string];
}
}
causes some problems. Everything works fine if I do it this way:
-(IBAction)saveString:(id)sender{
if(currentSelection != nil){
NSString *temps = [NSString stringWithFormat:#"%#", [[notesField textStorage] string]];
currentSelection.notes = temps;
}
}
So I'm guessing what was going on is that _notes was pointing to the text contained in my NSTextView. So when I changed the text there _notes also changed or something like that...