iosobjective-cxcodeobjective-c-category

Warning "Method definition not found" in Objective-C. Call Method from Category file

I have created some method in category file. I just want to reuse those methods in my view controllers. So I have imported that category file in view controllers and declared the method in header file also. calling it like this:

Category class:

@interface UIViewController (headerView)
-(UILabel *)someMethod;

@implementation UIViewController (headerView)
-(UILabel *)someMethod{
}

HomeViewController:

@interface HomeViewController : UIViewController
-(UILabel *)someMethod;

@implementation HomeViewController
[self someMethod];

I am getting warning message in this line:

@implementation HomeViewController

It's working. But I want to clear this warning. How can I do it?

Solution

  • If you want you category in view controller do it something like that

    Your category

    @interface UIViewController (ExtendedMethods)
- (void)someMethod;
@end

@implementation UIViewController (ExtendedMethods)
- (void)someMethod {
  NSLog(@"Some method");
}
@end

    MyViewController.m 

    #import "MyViewController.h"
#import "UIViewController+ExtendedMethods.h"

@implementation MyViewController
- (void)viewDidLoad {
  [super viewDidLoad];
  [self someMethod];
}
@end