Objective c property issue

Question

In my Settings.h file I have the line

@property (nonatomic, retain) NSArray * connections;

Also in the Settings.m file there are importing:

#import "Settings.h"

and later I provide the implementation

- (NSArray*)connections 
{
    return connections;
}
- (void)setConnections:(NSArray*)_connections
{
    connections = _connections; 
    // do some more stuff
}

But both in getter and setter I get an error about use of undeclared identifier 'connections' I have no idea what do I do wrong, so any of your help would be greatly appreciated!

Answer 1

You are, quite correctly, trying to use an ivar (called connections) as a backing store for your property, also called connections;

To get it to work, you should simply declare an ivar like this:

// Settings.h

NSArray * connections;

It should go between the curly brackets of the class declaration, like this:

@interface MyClass : MySuperClass {
    NSArray *connections;
    // More ivars...
}

@property (nonatomic, assign) NSArray *connections;

@end

Answer 2

in Settings.m 

@synthesize connections = _connections;

in setting.h

Answer 3

In Settings.h add an instance variable NSArray *connections; (if it's not there already), then in Settings.m just below @implementation add this:

@dynamic connections;

Another option is to remove you accessors and go for @synthesize connections; instead of dynamic and the accessor methods will be created for you.