Dear Peter,
thank you for your details.
It is true that I am confused about the initializers.
Which initializer should I call from my initWithCoder method?
I can not call [super initWithCoder] because NSDocument does not have
such a method. Should I call [self init] instead oder [super init]?
Still confused...
Thank you
Arno
Am 18.08.2011 09:39, schrieb Peter:
You have two independent initializers in your class.
You should have one designated initializer which is called by all
other initializers in your class.
Quoting from "The Objective-C Programming Language"
In the implementation of a custom initializer, you must ultimately
invoke a designated initializer.
Designated initializers are described in “The Designated
Initializer”; a full explanation of this issue is given
in “Coordinating Classes.”
In brief, if you are implementing a new designated initializer, it
must invoke the superclass’ designated initializer. If you are
implementing any other initializer, it should invoke its own
class’s designated initializer, or another of its own initializers
that ultimately invokes the designated initializer.
This makes sure that you don't get inconsistencies like those you
describe.
Am 17.08.2011 um 13:34 schrieb Arno Oesterheld:
Hello,
I am a beginner with Xcode and Objective-C and stuck with a quite
simple thing for over two days now. I hope you can help me.
My Project is deployed for OS X 10.6, it uses Garbage Collection and
I am using Xcode 4.0.1.
I made a multi document application starting with the template
provided by Xcode. I just have one class as subclass of NSDocument.
For opening documents I use initWithCoder. The decoding mithin this
method works fine - I get the values that were saved.
But these values are "lost" when I would like to use them in an other
method (of the same class).
I assume that I make some mistakes with using the right comibation of
init: / initWithCoder: / initWithContentsOfURL: etc.
The self-object does always have a different adress in the
initWithCoder method then in the other methods.
I tried plenty of combinations of the above methods and even tried to
call differend methods in the super class (NSDocument) within
initWithCoder.
This is my header file:
#import<Cocoa/Cocoa.h>
@interface OptimiererZwoMultiDoc : NSDocument<NSCoding> {
__strong struct bildanalyse {
float winkelo;
...
float skalfak; // Der Skalierungsfaktor, den dieses Bild
erfahren muss damit es so gross ist wie das kleinste - Wert ist also
immer<= 0
};
__strong struct bildanalyse *analyse;
__strong int16_t anzahlanalysewerte;
...
@private
NSTextView *ausgabe;
...
}
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification;
- (void) prepareAnalyseDoc;
...
@property (assign) IBOutlet NSTextView *ausgabe;
@property __strong struct bildanalyse *analyse;
@property __strong int16_t anzahlanalysewerte;
@end
When I try this implementation:
#import "OptimiererZwoMultiDoc.h"
@implementation OptimiererZwoMultiDoc
@synthesize ausgabe;
@synthesize analyse;
@synthesize anzahlanalysewerte;
...
- (id)init
{
self = [super init];
NSLog(@"init self=%@",self);
if (self) {
...
}
return self;
}
- (NSString *)windowNibName
{
NSLog(@"windowNibName self=%@",self);
return @"OptimiererZwoMultiDoc";
}
- (void)windowControllerDidLoadNib:(NSWindowController *)aController
{
NSLog(@"windowControllerDidLoadNib self=%@",self);
[super windowControllerDidLoadNib:aController];
}
- (BOOL) readFromData:(NSData *)data ofType:(NSString *)typeName
error:(NSError **)outError{
NSLog(@"readFromData self=%@",self);
[NSKeyedUnarchiver unarchiveObjectWithData: data];
if (outError) {
*outError = [NSError errorWithDomain:NSOSStatusErrorDomain
code:unimpErr userInfo:NULL];
}
return YES;
}
- (id) initWithCoder: (NSCoder *) coder{
struct bildanalyse tempAnalyse;
NSLog(@"initWithCoder self=%@",self);
anzahlanalysewerte = [coder decodeIntForKey:@"anzahlanalysewerte"];
....
return self;
}
then I get this output:
init self=<OptimiererZwoMultiDoc: 0x2002955a0>
readFromData self=<OptimiererZwoMultiDoc: 0x2002955a0>
initWithCoder self=<OptimiererZwoMultiDoc: 0x20028f5e0>
windowNibName self=<OptimiererZwoMultiDoc: 0x2002955a0>
windowControllerDidLoadNib self=<OptimiererZwoMultiDoc: 0x2002955a0>
As you can see, the object self is different in initWithCoder. Why?
What's wrong with my code?
Any advice is very welcome.
Thank you very much in advance!
Best regards
Arno
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