Question 68996 in IOS Swift Question posted in
The official documentation can be found here.

Append filtered string array to UILables – Swift – Ios swift

Long title! I do apologize.

Expected Outcome: Display uniqued string value in UILabel inside a UIView in a stackView. There may be multiple UIViews in the stackView. The stackView lives inside a tableCell. wow….

The views and cells are custom and I am not allowed to create sections. I have to work with what’s in the existing codebase.

Issue I am stuck at trying to get the unique optional string values into the respective UILabels. I have a working extension to get unique items from an array. But I just don’t know where to implement it, to get the unique values I need.

Code:

// Sample Model Structs
struct Parent {
    var child: [Child]?
}

struct Child {
    var childValue: String?
}

class TableViewCell {  
    var stackView = UIStackView()
    func configureCellFrom(parent: Parent) {
        /// Other code lives in the func to use the Parent struct.   
        if let child = parent.child {
            if child.count > 1 {
                tableCell.topLabel.text = "Multiple Child Values"
                tableCell.ShowChildViewsButton.isHidden = false
                for value in child {
                    let view = CustomUIView() 
                    view.childValue.text = value.childValue.uniqued()
                    self.stackView.addArrangedSubview(view)
                }      
            }
        }
    }
}   
    

extension Sequence where Element: Hashable {
    func uniqued() -> [Element] {
        var set = Set<Element>()
        return filter { set.insert($0).inserted }
    }
}

Above Problem: Where I placed the uniqued() method, will parse out the individual characters in the string. So I know that it is one level too deep. What’s the best way to achieve my required result?

Tags:

2

Answers


  1. 0

    Try this:

    for (i, value) in child.enumerated() {
    let view = CustomUIView()
    view.childValue.text = value.childValue.uniqued()[i]
    self.stackView.addArrangedSubview(view)
}
    Login or Signup to reply.
  2. 0

    The issue there is that uniqued method uses filter method declared on Sequence which will always return an array of the Sequence.Element in the case of a String an array of characters [Character]. You can simply initialize a new string with the array or characters or improve that method to support strings as well. To make that method support strings you need to extend RangeReplaceableCollection. There is a filter method declared on RangeReplaceableCollection which returns Self therefore if you filter a string it will return another string as I showed in this answer from the same post where you found the uniqued method you’ve shown in your question:

    extension RangeReplaceableCollection where Element: Hashable {
    var orderedSet: Self {
        var set = Set<Element>()
        return filter { set.insert($0).inserted }
    }
}

    Usage:

    view.childValue.text = value.childValue?.orderedSet
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search