Obj-C @synthesize example

mapViewController.h

// I have included a few steps in here to show the flow I normally do to get things working.
// Keep in mind I'm still a massive noob so there may be a better way to do all of this :/


// ...
// Class definition and imports

// STEP 1: Declare vars in the controller @interface
@interface MapViewController : UIViewController <MKMapViewDelegate, UISearchBarDelegate> {
    // ...

    // Interface objects
    MKMapView *mapView;
    UISearchBar *searchBar;

    // ...
    
    // Result objects
    NSMutableArray *results;
    NSMutableData *requestData;

}

// STEP 2: Declare properties of all above declared vars

// Interface objects
@property (nonatomic, retain) MKMapView *mapView;
@property (nonatomic, retain) UISearchBar *searchBar;

// Result objects
@property (nonatomic, retain) NSMutableArray *results;
@property (nonatomic, retain) NSMutableData *requestData;

// ...
// Function definitions etc.

mapViewController.m

// Top of .m
// ...
// Imports

// Implementation
#pragma mark - MapViewController
@implementation MapViewController

// STEP 3: Synthesize the set ivars
@synthesize mapView, searchBar, results, requestData

// STEP 4: Now you should be able to use them :)

// NOTE: If you are using ARC - if you want to allocate a set variable to memory and persist it then do:
results = [NSMutableArray array]; // from memory?

// NOTE: If you are not using ARC:
results = [[NSMutableArray alloc] init]


// I only ever use @syntesize to connect the .h and .m - as I said I might be wrong but it has worked for me so far haha

// If anyone else wants to correct me somewhere please do :) I'm keen to learn!