How to push text from one UITextfield to another UITextfield in the next View? And back!?

Question

an Hi,

I have an UITextField in one view, UITextField A in View A. And I have another in view B, UITextField B in View B.

I use a Navigation Controller Bar to switch between the views. The UITextFields are properties and connected Outlets of both views A and B.

On my view A there is an "Options"-button which pushes view B. So when you are typing in Textfield A, I would like the same text to appear in Textfield B.

When you edit TextField B and you go back to view A (via the "Title View A"-button in de navigation bar), I would like the same text to re-appear in Textfield A.

I expected this to be easy. But I can't get it working.

I tried:

ViewBController *controller = [[ViewBController alloc] initWithNibName:@"ViewBController" bundle:nil];
controller.TextFieldA.text = TextFieldB.text

But nothing appeared in view B. And how do I get back? I dont want to use NSUserdefaults because I would have to remove the values also.

Answer 1

The problem here might be that when u try setting textfieldAs text it is very possible that textFieldA has not been instantiated yet....you should check to see that it has...but i wouldnt connect textFieldA through IB because with your method here when ur view appears it might reintialize its Outlets and clear the text as well, i would probably programitcally set the textfield...hope this helps

Answer 2

Think Model View Controller (MVC)...NSUserDefaults could be a place to store your model, but so could an NSString

Lets assume you go with the NSString. Create it in A & make it a property of B, update your model (the string) in each view in viewWillDisappear. Update the view from the model in ViewWilAppear. Job done.

EDIT: To update a property of B

MyVC * b = [[MyVC alloc] init]; b.myProperty = theReallyImportantValueString;

Then display b with push or displayModalViewController

Answer 3

Thanks to Andii I finally found it.

First of all you can not push UITextFields properties to another view. I had to make a separate NSString that could be pushed. Like this

    BViewController *bViewController = [[BViewController alloc] initWithNibName:@"BViewController" bundle:nil];
    bViewController.aString = self.aTextField.text;

In the viewWillAppear of B I put:

bTextField.text = aString;

Then I wanted to push back the bTextField.text to the A view. I had to make a viewWillDisappear like this (you can also write it shorter):

- (void) viewWillDisappear:(BOOL)animated  {
NSArray *viewControllerArray = [self.navigationController viewControllers]; 
int parentViewControllerIndex = [viewControllerArray count] - 1;

[[viewControllerArray objectAtIndex:parentViewControllerIndex] setBString:bTextField.text];

 [super viewWillDisappear:animated];

}

Finally I had to add this in the viewWillAppear of A:

    if ([self.bString length] > 0) {
    aTextField.text = self.bString;
}