CODEWITHSUNDEEP
objective-cuiviewcontroller
Juan Roldan
Juan Roldan

Reputation: 21

Missing method declaration in view controller

I have typed this into my .m file - StudentLoginViewController - and the compiler keeps giving me the error:

no visible @interface for 'NOSbject' declares the selector 'viewDidLoad'

Here's my code:

// StudentLoginViewController.h

#import <UIKit/UIKit.h>

@interface StudentLoginViewController : NSObject  <UITextFieldDelegate> {
    IBOutlet UILabel *Username ,*Password ;
    IBOutlet UIButton *LoginButton ;
    IBOutlet UITextField *UsernameText ,*PasswordText;
}

@end

// StudentLoginViewController.m

#import "StudentLoginViewController.h"

@interface StudentLoginViewController ()

@end

@implementation StudentLoginViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    UsernameText.delegate=self;
    PasswordText.delegate=self;
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    // this text will not be updated to the newest text yet,
    // but we know what what the user just did to get into a string

    NSString *Username, *Password;
    if (textField == UsernameText) {
        Username = @"jzarate";
        Password = PasswordText.text; 
    } else {
        Username= UsernameText.text;
        Password = @"14054";
    }

    // If both the username and password are correct  then enable the button
    LoginButton.enabled = ([Username isEqualToString:@"jzarate"] && [Password isEqualToString:@"14054"]);

    // return YES so that the users edits  are used
    return YES;
}

@end

Please note that the code above for the .m file is all the code in it, I have removed the other bits above and below this.

Upvotes: 0

Views: 228

Answers (1)

NightFury
NightFury

Reputation: 13546

It is because viewDidLoad is invoked when you will inherit StudentLoginViewController from UIViewController instead of NSObject. NSObject is itself a super Class of all, so it does not have any parent, who declares viewDidLoad. So you are getting error at:

[super viewDidLoad];

Write:

@interface StudentLoginViewController : UIViewController <UITextFieldDelegate>

instead of

@interface StudentLoginViewController : NSObject <UITextFieldDelegate>

Upvotes: 2

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