componentsByString for NSMutableSet in Swift 3.0

Question

I have label and NSMutable Set.

I want to assign my set value to label.text.

  @IBOutlet var location: UILabel!
 var mutSet:NSMutableSet = NSMutableSet()

        self.location.text = **mutSet.allObjects.componetsJoinedByString("\n")**

mutSet.allObjects.componetsJoinedByString("\n") throws compile time error similarly I have tried joined , it also throws compile time error.

Please provide me alternative way in Swift

*compone**n**ts*. Why `NSMutableSet` at all? Use native Swift `Set`. — vadian, Sep 10 '17 at 18:18
Sorry,It didnt provide hint. same thing working in Objective C but not in swift — user7529768, Sep 10 '17 at 18:19
I have chosen NSMutableSet because I have to add String and Array of String to NSMutableSet. Native set is not allowing me add the String and Array of String — user7529768, Sep 10 '17 at 18:26
allObjects returns [Any] not [String] so the compiler can’t send it a message for a string. swift is stricter about this than Objective-C — Abizern, Sep 10 '17 at 18:32
That's not true. You can add string and array of string. See my answer. — vadian, Sep 10 '17 at 18:34
The NSMutableSet() that the OP is using doesn't work the same way as in your answer. — Abizern, Sep 11 '17 at 07:59

vadian · Answer 1 · 2017-09-10T19:06:35.667

2

First of all to answer your question: You have to write

(mutSet.allObjects as! [String]).joined(separator: "\n")

NS(Mutable)Set lacks any type information. You have to cast the type to actual [String]

It's highly recommended to use native Set and generally you are discouraged from using NSMutable... types if there is a native counterpart.

var mutSet = Set<String>(["a", "b", "c"])

You can append (actually insert) an item - a set is unordered

mutSet.insert("d")

or an array of items

mutSet.formUnion(["c", "d", "f"])

Joining is much shorter than in Foundation NSMutableSet

mutSet.joined(separator: "\n")

or sorted joined

mutSet.sorted().joined(separator: "\n")

edited Sep 10 '17 at 19:06

answered Sep 10 '17 at 18:33

vadian

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Thank you for the solution – user7529768 Sep 11 '17 at 15:13
Thank them by accepting their answer! Click the tick. – occulus Jun 02 '18 at 21:44

componentsByString for NSMutableSet in Swift 3.0

1 Answers1