如何有条件地改变成一个新的故事板

Question

我正在用Xcode 7 IOS 9编写一个小IOS应用程序(目标-c)。现在，我正试图通过按一个名为“确认”的按钮，从主故事板切换到第二个故事板。如何在ViewController.m中编写有条件地转到第二个故事板的代码？因此，如果所有输入是正确的，用户按确认它将转到新的故事板，否则停留和显示警告信息。谢谢!

Answer 1

    UIStoryboard *storyBoard;
    if (yourcondition)
           storyBoard = [UIStoryboard storyboardWithName:@"StoryBoard1" bundle:[NSBundle mainBundle]];
    else
            storyBoard = [UIStoryboard storyboardWithName:@"StoryBoard2" bundle:[NSBundle mainBundle]];

    YourTargetViewController *targetCon = [stryBoard instantiateViewControllerWithIdentifier:@"TargetControllerID"];
    [self.navigationController pushViewController:targetCon animated:YES];

希望能帮上忙..。

Answer 2

试试这段代码。可能对你有帮助。

//button Actions
- (IBAction)loginbtnClicked:(id)sender
{
    [self.tfEmail resignFirstResponder];
    [self.tfPasswrd resignFirstResponder];
    if ([self.tfEmail.text isEqualToString:@""] || [self.tfPasswrd.text isEqualToString:@""])
    {
          UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@“Title” message:@"You are required to fill out all fields." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
          [alert show];
          return;
    }
   if ([self isEmailValid:self.tfEmail.text])
   {
         //put your required code here.

        //Navigate to next view controller.
        UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main” bundle:nil];
        HomeVC *homeVC =[storyboard instantiateViewControllerWithIdentifier:@"HomeVCID"];
        [self.navigationController pushViewController:chatVC animated:TRUE];
   }
   else
   {
         UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@“Title” message:@"Please enter valid email address." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
   }
}