Question

Probably a noob problem but here it is. I have my AppDelegate instantiating a new dictionary from a file in “application didFinishLaunchingWithOptions”. I have an addViewController that I would like to pass a new object to be added to the AppDelegate’s dictionary, for later saving to disk. Here’s some snippets of what I’ve got.

//
//  AppDelegate.m
//  PersonLibraryiOS
//
//  Created by Joey on 11/7/12.
//  Copyright (c) 2012 Joey. All rights reserved.
//

#import "AppDelegate.h"
#import "AddViewController.h"
#import "Person.h"
@implementation AppDelegate
@synthesize PersonDict;

-(void)addtoDict:(Person *)newPerson
{
    [PersonDict setObject:@"newPerson" forKey:[newPerson name]];
}



- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    return YES;
    PersonDict = [NSMutableDictionary dictionaryWithContentsOfFile:@"diskDict"];

and the AddViewController:

//
//  AddViewController.m
//  personLibraryiOS
//
//  Created by Joey on 11/8/12.
//  Copyright (c) 2012 Joey. All rights reserved.
//

#import "AddViewController.h"
#import "TableViewController.h"
#import "person.h"
#import "AppDelegate.h"

@implementation AddViewController
@synthesize nameLabel;
@synthesize ageLabel;
@synthesize heightLabel;
@synthesize weightLabel;
@synthesize hairColorLabel;
@synthesize eyeColorLabel;


- (IBAction)saveButton:(id)sender
{
    person *newperson = [[person alloc]init];

    newperson.name = [nameLabel text];
    newperson.age = [ageLabel text];
    newperson.height = [heightLabel text];
    newperson.weight = [weightLabel text];
    newperson.hairColor = [hairColorLabel text];
    newperson.eyeColor = [eyeColorLabel text];



    [AppDelegate addtoDict:newperson];  <---- the error is here

     }

I know this is probably basic but I’m really confused. I’m importing the AppDelegate.h file in the addViewController, so it should know all about AppDelegate’s methods.

Thanks everyone.

Answer 1

The line:

[AppDelegate addtoDict:newperson];

is attempting to call a class method named addtoDict: on the the class named AppDelegate. Most likely you want to call the addtoDict: instance method (not class method) on your app’s app delegate instance.

You probably want:

[(AppDelegate *)[NSApplication sharedApplication].delegate addtoDict:newperson];