-[ViewAController doLogin:]: unrecognized selector sent to instance 0x6901bc0

Question

this is login.m

#import 


@interface login : UIViewController {
    IBOutlet UITextField *UserName;
    IBOutlet UITextField *PassWord;
    IBOutlet UIActivityIndicatorView *LoginActivity;
}
@property (nonatomic, retain) IBOutlet UITextField              *UserName;
@property (nonatomic, retain) IBOutlet UITextField              *PassWord;
@property (nonatomic, retain) IBOutlet UIActivityIndicatorView  *LoginActivity;
- (IBAction) doLogin:(id)sender;

@end

and this login.h


#import "login.h"

@implementation login

@synthesize UserName,PassWord;

- (IBAction) doLogin:(id)sender {
    [ PassWord resignFirstResponder ];
    [ LoginActivity startAnimating ];
    NSLog(@"%@ / %@", [ UserName text ], [ PassWord text ] );
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

- (void)viewDidUnload {
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}
- (void)dealloc {
    [super dealloc];
}
@end

if i press login(dologin) i got this error -[ViewAController doLogin:]: unrecognized selector sent to instance

As an unrelated tip, class names,like "login", should be capitalized (Login) and variable names, like "UserName", shouldn't (userName). It makes the code easier to read if if follows standards. — Terry Wilcox

Terry Wilcox Terry Wilcox · Accepted Answer · 2011-04-29T20:15:21

It looks like you've named the class "login", but have hooked up the button to an instance of "ViewAController". ViewAController doesn't have a doLogin: method?

-[ViewAController doLogin:]: unrecognized selector sent to instance 0x6901bc0

1 Answers