iOS Message Sending btw two objects

[erdinc27]

hey guys. i want to develop a project to learn something new. so i created a scenario. i have Two classes(TheDriver and TrafficLights). here the classes.

TheDriver.h

#import <Foundation/Foundation.h>


@interface TheDriver : NSObject

@property (retain, nonatomic) NSString *driverName;
@property (assign, nonatomic) NSInteger drvierAge;
@property (assign, nonatomic) NSInteger driverLicenseCode;

TheDriver.m

#import "TheDriver.h"

@implementation TheDriver

@synthesize driverName;
@synthesize driverLicenseCode;
@synthesize drvierAge;


- (id) init
{
    self = [super init];
    
    if (self)
    {
        
    }
    
    return self;
}

TrafficLights.h

#import <Foundation/Foundation.h>


@interface TrafficLights : NSObject

- (void) redLineActived;
- (void) greenLineActivated;

TrafficLights.m

#import "TrafficLights.h"

@implementation TrafficLights


- (void) redLineActived
{
    
}


- (void) greenLineActivated
{
    
}

@end

i want the driver will push gas pedal when the traffic light is green and if the red light is activated the driver will push break pedal.
i try to make it with delegate but i couldn't achieve. anyone who can help me about this ?

 

[dejo]

i try to make it with delegate but i couldn't achieve. anyone who can help me about this ?

You should show us the code where you tried to use delegation. We can't guess what it was. Also, what do you mean by you "couldn't achieve"? Please elaborate.

 

[erdinc27]

i tried something like this

TheDriver.h

#import <Foundation/Foundation.h>
#import "TrafficLights.h"


@interface TheDriver : NSObject<redLightDelegate>

@property (retain, nonatomic) NSString *driverName;
@property (assign, nonatomic) NSInteger drvierAge;
@property (assign, nonatomic) NSInteger driverLicenseCode;

TheDriver.m

#import "TheDriver.h"

@implementation TheDriver

@synthesize driverName;
@synthesize driverLicenseCode;
@synthesize drvierAge;


- (id) init
{
    self = [super init];
    
    if (self)
    {
        
    }
    
    return self;
}


- (void) redLightSwitchedOn
{
    NSLog(@"The Driver Should Push Break Pedal");
}

TrafficLights.h

#import <Foundation/Foundation.h>

//@class TrafficLights;

@protocol redLightDelegate <NSObject>
- (void) redLightSwitchedOn;
@end

@interface TrafficLights : NSObject

@property (nonatomic, strong) id <redLightDelegate> redLightDel;

- (void) redLightActivated;
- (void) greenLineActivated;

TrafficLights.m

#import "TrafficLights.h"

@implementation TrafficLights
@synthesize redLightDel;

- (void) redLightActivated
{
    [self.redLightDel redLightSwitchedOn];
}


- (void) greenLineActivated
{
    
}

and in viewDidLoad method of viewController i wrote like this

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    
    TrafficLights *myTrafficLight=[[TrafficLights alloc] init];
    [myTrafficLight redLightActivated];

}

but in Log screen nothing is seen.

 

[dejo]

What is the value of redLightDel when this method runs?:

- (void) redLightActivated
{
    [self.redLightDel redLightSwitchedOn];
}

 

[erdinc27]

when this method runs i expect to be triggered "redLightSwitchedOn" method in "TheDriver.m" filen and written in Log screen but nothing is written there. i cant find where i make the mistake.
should i assign the delegate somewhere to any object ?

 

[dejo]

when this method runs i expect to be triggered "redLightSwitchedOn" method in "TheDriver.m" filen and written in Log screen but nothing is written there. i cant find where i make the mistake.
should i assign the delegate somewhere to any object ?

That doesn't really answer my question. Do some basic debugging. When that line of code runs, what is the value of redLightDel? Is it nil or does it point to some redLightDelegate instance? If it's nil, is that a problem?