我需要使用委托将字符串从NSObject类传递给UIViewController

Question

I need to pass a string from a NSObject class to a UIViewController, I understand that the best way is delegation but the delegate method isn't being called. I'm trying to set the UILabel an DieFacesViewController as the selectedOption from TemporarySelection.

A tableview shows the value of CustomOptionStore, once it's tapped passes its value to TemporarySelection and opens the modal view DieFacesViewCountroller which should, at least in my mind, take the label value from TemporarySelection. The reason I created TemporarySelection is because the DieFacesViewController will be used by other classes, not only by CustomOptionStore, and it will need to load the label from all those classes when different tableViews are selected.

I tried to set the delegate as self in both viewDidLoad and viewWillAppear with no luck, I don't understand if the view loads before being able to call the delegate method or if there's something wrong the way I set the method up.

I've been stuck here for two days, this is the first time I post a question so please forgive me if it's a bit confused.

my delegator class TemporarySelection.h is

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

@class DieFacesViewController;

@protocol TemporarySelectionDelegate <NSObject>

-(void)sendSelection;

@end

@interface TemporarySelection : NSObject

@property (nonatomic, weak) id <TemporarySelectionDelegate> delegate;

@property (nonatomic, strong) NSString *selectedOption;

-(void)addSelection: (CustomOptionsStore *) selection;


@end

and my TemporarySelection.m is

#import "TemporarySelection.h"

@implementation TemporarySelection

-(void)addSelection: (CustomOptionsStore *) selection{

    self.selectedOption = selection.description;

    [self.delegate sendSelection];


}

@end

the delegate class DiewFacesViewController.h is

#import <UIKit/UIKit.h>
#import "SelectedStore.h"
#import "TemporarySelection.h"


@interface DieFacesViewController : UIViewController <TemporarySelectionDelegate>


@property (strong, nonatomic) IBOutlet UILabel *SelectionName;


@end

and the DieFacesViewController.m is

#import "DieFacesViewController.h"

@interface DieFacesViewController ()

@end

@implementation DieFacesViewController


- (void)viewDidLoad {

    TemporarySelection *ts = [[TemporarySelection alloc]init];
    ts.delegate = self;

    [super viewDidLoad];

}

-(void)sendSelection{

    TemporarySelection *ts = [[TemporarySelection alloc]init];
    self.SelectionName.text = ts.selectedOption;

}


-(void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:YES];

} 

Answer 1

You are not setting the delegate object properly.Check the above code

 #import "DieFacesViewController.h"

@interface DieFacesViewController ()<TemporarySelectionDelegate>
{
//global object

TemporarySelection *ts;
}
@end

@implementation DieFacesViewController


- (void)viewDidLoad {

    ts = [[TemporarySelection alloc]init];
    ts.delegate = self;

    [super viewDidLoad];

}

-(void)sendSelection{

   //Use the object to extract
    self.SelectionName.text = ts.selectedOption;

}


-(void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:YES];

}