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I created a button and added an action for it, but as soon as it invoked, I got this error: -[NSCFDictionary numberButtonClick:]: unrecognized selector sent to instance 0x3d03ac0 2010-03-16 22:23:58.811 Money[8056:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason:'*** -[NSCFDictionary numberButtonClick:]: unrecognized selector sent to instance 0x3d03ac0' This is my code: - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) { UIButton *numberButton = [UIButton buttonWithType:UIButtonTypeCustom]; numberButton.frame = CGRectMake(10, 435, 46, 38); [numberButton setImage:[UIImage imageNamed:@"one.png"] forState:UIControlStateNormal]; [numberButton addTarget:self action:@selector(numberButtonClick:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview: numberButton]; } return self; } -(IBAction)numberButtonClick:(id)sender{ NSLog(@"---"); }

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