CODEWITHSUNDEEP
objective-carrays
Prateek
Prateek

Reputation: 1754

Xcode Global Array and Function

I am trying to create a global array in my app which can be accessed by ALL view controllers. I have put the code in the AppDelegate and then imported the AppDelegate in to the view controller files.

Within the app delegate, I have created an array in the didFinishLaunchingWithOptions: function. However, I need to create a new function in the AppDelegate which I can then call from other view controllers to filter this global array. So far I have this:

// Function to get suggested foods
- (BOOL)getFood:inCategory(NSString *)foodCat 
{
NSMutableArray *filteredArray=[[foodArrayMain filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(foodCat==%@)",foodCat]] mutableCopy];

return filteredArray;
}

However, I know there are errors here and it doesn't seem to work. I have tried calling it in one of the other view controllers like this:

NSArray *foods= [AppDelegate getFood:@"meats"];

Any help?

Upvotes: 0

Views: 231

Answers (2)

Amandir
Amandir

Reputation: 677

First step would be to change the ReturnValue from:

- (BOOL)getFood:inCategory(NSString *)foodCat

to:

- (NSMutableArray *)getFood:inCategory(NSString *)foodCat

Also: I wouldn't use AppDelegate for this. I is not really good style.

Another way would be to use a propertyList in your app's document folder and use that to serialise/deserialise the array information.

Upvotes: 0

giorashc
giorashc

Reputation: 13713

You need to use the AppDelegate instance rather than the AppDelegate class (since your method is an instance method) :

AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedInstance].delegate;
NSArray *foods = [appDelegate getFood:@"meats"];

As Amandir mentioned change the return value of your method to NSArray * since that is the type of the value you are returning from this method. (Or use NSMutableArray * if you intend to modify the array by the calling class or anywhere else)

A more suitable approach will be to define a singleton class which manages your global settings/data.

Upvotes: 1

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