I have swift array of tuples [(String, String)] and would like to cast this array to NSMutableArray. I have tried this and it is not working:
let myNSMUtableArray = swiftArrayOfTuples as! AnyObject as! NSMutableArray
2 Answers
Since swift types like Tuple or Struct have no equivalent in Objective-C they can not be cast to or referenced as AnyObject which NSArray and NSMutableArray constrain their element types to.
The next best thing if you must return an NSMutableArray from a swift Array of tuples might be returning an Array of 2 element Arrays:
let itemsTuple = [("Pheonix Down", "Potion"), ("Elixer", "Turbo Ether")]
let itemsArray = itemsTuple.map { [$0.0, $0.1] }
let mutableItems = NSMutableArray(array: itemsArray)
1 Comment
Coder ACJHP
NSMutableArray(array: itemsArray) this was the trickThere are two problems with what you are trying to do:
- Swift array can be cast to
NSArray, but it cannot be cast toNSMutableArraywithout constructing a copy - Swift tuples have no Cocoa counterpart, so you cannot cast them or Swift collections containing them to Cocoa types.
Here is how you construct NSMutableArray from a Swift array of String objects:
var arr = ["a"]
arr.append("b")
let mutable = (arr as AnyObject as! NSArray).mutableCopy()
mutable.addObject("c")
print(mutable)
answered Apr 14, 2016 at 0:09
Sergey Kalinichenko
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[[String]]and save it as[AnyObject]