I'm having trouble adding an existing array to the beginning of another array. For example: MutableID array contains 1,2,3,4,5 & idArray array contains 6,7,8
self.MutableID.addObjectsFromArray(idArray as [AnyObject])
//currently puts values to the end of the array not the beginning
this code outputs 1,2,3,4,5,6,7,8 but I want it to output 6,7,8,1,2,3,4,5
I need the values added to the beginning of self.MutableID Any suggestions on how I can accomplish this?
NSMutableArray has insertObjects method.
self.MutableID.insertObjects(otherArray as [AnyObject], atIndexes: NSIndexSet(indexesInRange: NSMakeRange(0, otherArray.count)))
Or you can assign the mutable array to a swift array and use insertContentsOf method ;)
self.MutableID = NSMutableArray(array: [1,2,3,4])
var otherArray = NSMutableArray(array: [6,7,8,9])
var swiftArr : [AnyObject] = self.MutableID as [AnyObject]
swiftArr.insertContentsOf(otherArray as [AnyObject], at: 0)
self.MutableID.insertContentsOf(idArray as [AnyObject], at: 0)
NSArray and NSMutableArray directly. Use var MutableID: [Int] instead.
[AnyObject] to a [Int].NSMutableArray, your question should make that clear with more than just the tags.idArray to [AnyObject] then. Or just use var MutableID: [AnyObject] if really necessary.This question is the Swift version of this question which solves the problem in Objective-C.
If we must, for whatever reason, be using Objective-C's NSArray or NSMutableArray, then we can simply use a Swift translation of the code in my answer over there:
let range = NSMakeRange(0, newArray.count)
let indexes = NSIndexSet(indexesInRange: range)
oldArray.insertObjects(newArray as [AnyObject], atIndexes: indexes)
Where oldArray is an NSMutableArray and newArray is NSArray or NSMutableArray.
Or the other approach, append and reassign:
oldArray = newArray.arrayByAddingObjectsFromArray(oldArray as [AnyObject])
But the most correct thing to do would be to use the Swift Array type, and then use the insertContentsOf(_: Array, at: Int) method, as fluidsonic's answer describes.
