I am trying to learn Cocoa and wrote a simple app using the MVC pattern. The
view controls two text fields, the controller receives events from a single
button, and the model receives the value entered into the first text field, and
then requests the view to display that value in the second text field. I used
IB to construct the UI and connect the view object with the text fields, and
made the controller the target for the button. The build is successful, but
the value from the first text field is not copied into the second. A printf
shows the integer value from the first text field is zero. Here are the short
files. Thanks in advance.
Don Klett
#import <Cocoa/Cocoa.h>
#import "View.h"
@interface Model : NSObject {
int value;
View* view;
}
@property (readwrite) int value;
- (void) showValue;
@end
--------
#import "Model.h"
#import "View.h"
@implementation Model
- (id) init {
self = [super init];
view = [[View alloc] init];
return self;
}
@synthesize value;
- (void) showValue {
self.value = [view getFieldValue];
[view setResult:self.value];
}
@end
------
#import <Cocoa/Cocoa.h>
@interface View : NSObject {
IBOutlet NSTextField* number;
IBOutlet NSTextField* result;
}
- (int) getFieldValue;
- (void) setResult: (int) value;
@end
------
#import "View.h"
@implementation View
- (int) getFieldValue {
return [number intValue];
}
- (void) setResult: (int) value {
[result setIntValue:value];
}
@end
------
#import <Cocoa/Cocoa.h>
#import "Model.h"
@interface Controller : NSObject {
Model* model;
}
- (IBAction) viewAction: (id) sender;
@end
------
#import "Controller.h"
@implementation Controller
- (id) init {
self = [super init];
model = [[Model alloc] init];
return self;
}
- (IBAction) viewAction: (id) sender {
[model showValue];
}
@end
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