Question

It’s about objective c and cocoa

I’ve faced a problem and don’t know how to solve it. Hope I can find answer here and it will be helpful for some other programmers.

So, I have a simple window with 4 elements:

1. NSTextField – first field to set value
2. NSButton – to set value in first field
3. NSTextField – second field to set value
4. NSButton – to set value in second field

here is “controller 1” code:

#import "controller2.h"

@interface controller1 : NSControl{
IBOutlet NSTextField * text1;
}
-(IBAction)click:(id)sender;
@end

@implementation controller1
-(IBAction)click:(id)sender
{
[text1 setStringValue:@"text1 changed"];

// create controller 2 instance
controller2 * c2 = [[[controller2 alloc] init] autorelease];
// call first time using one way
[c2 click:self];

// call second time using another way
[self sendAction:@selector(click:) to:c2];
}
@end

and controller 2 code:

@interface controller2 : NSControl{
IBOutlet NSTextField * text2;
}
-(IBAction)click:(id)sender;

@end

@implementation controller2
-(IBAction)click:(id)sender
{
[text2 setStringValue:@"text 2 changed"];
NSLog(@"Test2");
}
@end

when I click on button1 I rase “click” in controller1 – everything is fine and work correct

when I click on button2 I rase “click” in controller2 – everything is fine and work correct

BUT if I want to click button1 and rase “click” in controller2 it doesn’t work (

Can anyone help with it? It seems to have a very simple resolution but i don’t know what i did wrong.

Answer 1

controller2 * c2 = [[[controller2 alloc] init] autorelease];

You’re creating a completely new “controller2” (bad name for a class, by the way – always capitalize class names: “MyController”, etc.). You need an IBOutlet from your Controller1 to a Controller2. That way you can send messages to it by name.

Remember: objects in a nib are “freeze-dried” instances of classes.