May I indulge the group.
In doing the Hillegass challenge of Chapter 18 ( creating a doc based
app to draw ovals), detoured to get a deeper understanding to Apples
Sketch-112, which in turn lead to properties and ivars, which lead to
this little demo app to give me some more insight into how properties
and ivars worked. The problem I have is that I cannot set a label
programmatically....and am not sure if this is related to my
understanding of properties, or my understanding of the workings of an
NSTExtField.
( I did a search of this site, tried, "validateEditing" but still
could not prevail. )
Basically, a non-doc app, with an NSTextField ( whose initial title is
"label"), an AppController with an IBOutlet ( textField), and with
AppController's outlet to NSTextField's control connection established
in the nib.
The relevant code in AppController.h thus.
@interface AppController : NSObject {
NSTextField * _textField;
}
@property (readwrite, retain) IBOutlet NSTextField *textField;
The accessors like this. ( I know that I could have used @synthesize)
but I wanted to see what was happening in the code.
- (NSTextField*) textField
{
METHOD_LOG;// << A macro which reveals method's name, and the object
(self) >>
NSLog(@"%@", _textField);
return _textField;
}
- (void) setTextField: (NSTextField*) t
{
METHOD_LOG;
if ( _textField == t)
return;
[_textField release];
[t retain];
_textField = t;
NSLog(@"The value of TextField \"_textField\" is: %@",[_textField
stringValue]);
// this line a test to see if "validateEditing" works
[_textField validateEditing]; // does not effect outcome
}
and finally, in awakeFromNib, this;
METHOD_LOG;
NSColor * g = [ NSColor greenColor];
NSString *s = @"FooBar";
NSTextField *f = [[NSTextField alloc]init];
[f setBackgroundColor:g];
[f setStringValue:s];
NSLog(@"The value of TextField \"f\" is: %@",[f stringValue]);
[self setTextField: f];
[f release];
My output is this: (which includes a warning, which is probably
relevant, but I have not been able to find much on it);
MethodName: setTextField: "self" = <AppController: 0x1002140d0>
The value of TextField "_textField" is: label
MethodName: awakeFromNib "self" = <AppController: 0x1002140d0>
The value of TextField "f" is: FooBar
MethodName: setTextField: "self" = <AppController: 0x1002140d0>
The value of TextField "_textField" is: FooBar
__CFServiceControllerBeginPBSLoadForLocalizations timed out while
talking to pbs
So, from my reading of ivars, properties and outlets, it seems that
Apple now recommends that the properties (not the ivars ) be exposed,
which I have tried to do. Also, from the output in the console, it
seems as if the outlet is set, but then reverts back to the word
"label". Some insight would be appreciated. (It might very well be
that this involves something that is yet to be covered, and if so, I
will move on. But, just wish to know if this is something obvious that
I have missed).
Thanks as always.
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