当使用popViewController时，推送segue不工作

Question

我试图将我的SignupViewController.h发送到另一个视图控制器。我使用手动推送segue将SignupViewController连接到我的SetupProfileViewController。我也做了同样的事情来回到LoginView。

返回LoginView的解雇操作非常完美。但是，当我按下注册按钮时，女巫通常也会把我的SetupViewController带到iOS模拟器中崩溃。任何建议。

请参阅下面的代码。

  @interface SignupViewController ()

 @end

 @implementation SignupViewController

 - (void)viewDidLoad
{
    [super viewDidLoad];

}



 - (IBAction)signup:(id)sender {


      NSString *username = [self.usernameField.text stringByTrimmingCharactersInSet:            
      [NSCharacterSet whitespaceAndNewlineCharacterSet]];

      NSString *password = [self.passwordField.text stringByTrimmingCharactersInSet:
     [NSCharacterSet whitespaceAndNewlineCharacterSet]];

  NSString *email = [self.emailField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

if ([username length] == 0 || [password length] == 0 || [email length] == 0) {
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Please try again."
                                                        message:@"Make sure you enter all fields."
                                                       delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alertView show];
}
else {
    PFUser *newUser = [PFUser user];
    newUser.username = username;
    newUser.password = password;
    newUser.email = email;

    [newUser signUpInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
        if (error) {
            UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Sorry!"
                                                                message:[error.userInfo objectForKey:@"error"]
                                                               delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [alertView show];
        }
        else {
           [self performSegueWithIdentifier:@"setup" sender:sender];

        }
    }];
}
}






- (IBAction)dismiss:(id)sender {
[self.navigationController popViewControllerAnimated:YES];
 }


@end