在视图之间导航时保​​留UI数据

Question

In my test project I have a ViewController and a TableViewController controller embedded in a Navigation Controller. The ViewController is the main view, and the user can navigate to the TableViewController and then return back to the ViewController.

I am using a 'push' segue when going from ViewContoller>TableViewController, and the TableViewController is dismissed using [self dismissViewControllerAnimated:YES completion:nil]; when the user wishes to go back to ViewController.

In ViewController, I have a button that changes the text on a label:

-(IBAction)onButtonPress:(id)sender {
      _myLabel.text = @"New Label Text";
}

When navigating to TableView, and then back to ViewController, the change in the _myLabel.text has been lost and the original text is restored . What is the best way to ensure UI data is retained when navigating between views? I might only have one label in this project, but at some point I will have many UI elements, for example, WebViews that need to keep a page loaded when the user navigates away and then comes back.

What would you suggest is the best method to implementing this?

Thanks for your time.

Answer 1

First of all, View is your data representation, any data is your Model. So you may store Model with its entities and values. Your controllers manage data to represent it on View or to change Model according to user actions in View.

So add some Model-object for storing _myLabel.text . And use this object for both controllers in your app.

Answer 2

尝试从ViewWillAppear或ViewDidAppear方法中删除设置文本，将其放在ViewDidLoad 。