The back button in the UINavigationBar under control of UINavigationView is constructed based on the settings of the previous view controller. Please try this:         self.navigationController?.navigationBar.backItem?.backButtonTitle = backButtonTitle (Not topItem, but backItem. Modifying topItem would be effective only before the navigation takes place.) By the way, your question is not related to the SwiftUI framework and the tag SwiftUI is not appropriate. Better use UIKit instead.

Please show the class header of the view controller and the part defining leaderBoardTableView. Your code looks as if it is a subclass of UITableViewController.

There may be some problems in your code. Can you create a minimized project which can reproduce the issue and show all the code? Just a short fragment of code would not help finding what is the problem.

Where is your ZStack embedded? Can you show all the code?

Create a function to execute all of them and call it.

Hardly to say anything with the fragments of code currently shown. Please include enough code (including class/struct headers and how those types are instantiated).

However it is working now and I am very grateful! Happy to hear that. Frankly I was at a loss how I should tell what is wrong... I will try better if I have another chance. Good luck.

Using debounce on a single-element publisher like dataTaskPublisher does not make sense. What sort of output do you expect with using debounce?

Can you be more specific? What is Variable to a text field? If you mean text parameter of a text field, there are no ways to have two. Why don't you use two text fields?

Are you talking about the buttons of the navigationBarItems? Or the buttons of each row of the List?

Is that means I can declare import inside class's body code block?? NO.

Are you sure kCGImageSourceTypeIdentifierHint is the right key for your purpose? The doc of kCGImageSourceTypeIdentifierHint says This key can be provided in the options dictionary when you create a CGImageSource object, no mention about CIFilter. At least, the key needs to be of type CIRAWFilterOption, not String. let sourceTypeIdentifierHint = CIRAWFilterOption(rawValue: kCGImageSourceTypeIdentifierHint as String) let rfo: [CIRAWFilterOption: Any] = [ sourceTypeIdentifierHint : "com.sony.raw-image" ]

This line is causing the issue: let storeView = storeViewController() (In Swift, type names should start with Capital letters.) You should not create a new instance of a view controller using init(). You need to access the right instance of storeViewController without creating a new one. To find how to fix, you need to clarify the relationship (transition) between storeViewController and liveViewController.

According to the CIFilter initializer, it is recommended to provide this option.   Thanks. I was missing that part.

a textfield I'm talking about is one you type things in. So what? Can you explain?