CODEWITHSUNDEEP
objective-cios7
fabian
fabian

Reputation: 5463

Static var, method or singleton?

i was wondering how to access "static" vars from a model from different ViewControllers. Should I go for:

#import "CategoryModel.h"

@implementation CategoryModel

-(NSArray*) allSelected {
    return [[NSArray alloc] initWithArray:[[NSUserDefaults standardUserDefaults] objectForKey:SELECTEDCATEGORIES_DEFAULTSKEY]];
}

-(NSString*) allSelectedAsUrlParams {
    NSMutableString *categoryList = [NSMutableString string];

    for (NSArray *category in self.allSelected) {
        [categoryList appendString:[category valueForKey:@"value"]];
        if(![[self.allSelected lastObject] isEqual:category]) {
            [categoryList appendString:@","];
        }
    }

    return categoryList;

}

@end

*Edit (working) *

// header
#import <Foundation/Foundation.h>

@interface CategoryModel : NSObject

+ (NSString*)allSelectedAsUrlParams;

@end


// implementation
#import "CategoryModel.h"

@implementation CategoryModel


+ (NSString*)allSelectedAsUrlParams {
    return @"somethingGreat";
}

@end

// How to use
CategoryModel.allSelectedAsUrlParams

Upvotes: 0

Views: 61

Answers (1)

Paul Bonneville
Paul Bonneville

Reputation: 1945

This is really going to be a matter of architectural preference, but if more than one class is going to need the static vars, this is one approach:

Constants.h

extern BOOL const TEST_MODE;
extern NSString * const SOME_STRING;

Constants.m

BOOL const TEST_MODE = YES;
NSString * const SOME_STRING = @"SomeString";

As an alternative, you can just add the extern NSString * const SOME_STRING; to the header of class that it is specific to (and the corresponding NSString * const SOME_STRING = @"SomeString"; in the .m) and then call that var directly by importing the header of the class with the constant you need and using SOME_STRING to get at it.

Upvotes: 1

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