Objective-C: How to access methods in other classes
- by Adam
I have what I know is a simple question, but after many searches in books and on the Internet, I can't seem to come up with a solution. I have a standard iPhone project that contains, among other things, a ViewController. My app works just fine at this point.
I now want to create a generic class (extending NSObject) that will have some basic utility methods. Let's call this class Util.m (along with the associated .h file).
I create the Util class (and .h file) in my project, and now I want to access the methods contained in that class class from my ViewController.
Here's an example of a simple version of Util.h
#import <Foundation/Foundation.h>
@interface Util : NSObject {
}
- (void)myMethod;
@end
Then the Util.m file would look something like this:
#import "Util.h"
@implementation Util
- (void)myMethod {
NSLog(@"myMethod Called");
}
@end
Now that my Util class is created, I want to call the "myMethod" method from my ViewController. In my ViewController's .h file, I do the following:
#import "Util.h"
@interface MyViewController : UIViewController {
Util *utils;
}
@property (assign) Util *utils;
@end
Finally, in the ViewController.m, I do the following:
#import "Util.h"
@implementation MyViewController
@synthesize utils;
- (void)viewDidLoad {
[super viewDidLoad];
utils.myMethod; //this doesn't work
[utils myMethod]; //this doesn't work either
NSLog(@"utils = %@", utils); //in the console, this prints "utils = (null)"
}
What am I doing wrong? I'd like to not only be able to directly reference other classes/methods in a simple util class like this, but I'd also like to directly reference other ViewControllers and their properties and methods as well.
I'm stumped! Please Help.
