Sorting of an array alphabetically in swift
First convert NSMutableArray to the Array by using below line of code.
let swiftArray = mutableArray as AnyObject as! [String]Use below line of code to sort the Array.
var sortedArray = names.sorted { $0.localizedCaseInsensitiveCompare($1) == NSComparisonResult.OrderedAscending }Check below link for sort Closures.https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Closures.html
Update for Swift 3.0
var sortedArray = swiftArray.sorted { $0.localizedCaseInsensitiveCompare($1) == ComparisonResult.orderedAscending }