ios – 在swift中不能在不同大小的类型之间使用unsafeBitCast

func uniq<S : SequenceType,T : Hashable where S.Generator.Element == T>(source: S) -> [T] {
    var buffer = [T]()
    var added = Set<T>()
    for elem in source {
        if !added.contains(elem) {
            buffer.append(elem)
            added.insert(elem)
        }
    }
    return buffer
}

func filter() {
    var arrayForSearch = mp3Files as! [String]
    var filteredArray = uniq(arrayForSearch)
    println("filtered array (filteredArray)")
}

我在这个链接enter link description here上找到的重复查找方法.我使用Xcode 6和Swift 1.2

这段代码中有数组.

var mp3Files: Array<String!>!
func exportData() {
    var generalURL: [AnyObject]?
    var arrayFiles: Array<NSURL!>!
    var directory = fileManager.URLsForDirectory(NSSearchPathDirectory.DocumentDirectory,inDomains: NSSearchPathDomainMask.UserDomainMask)
    var urlFromDirectory = directory.first as! NSURL

    var file = fileManager.contentsOfDirectoryAtURL(urlFromDirectory,includingPropertiesForKeys: nil,options: NSDirectoryEnumerationOptions.SkipsHiddenFiles,error: nil)!
    println("file (file)")

    mp3Files = file.map(){ $0.lastPathComponent }.filter(){ $0.pathExtension == "mp3" }

  println("mp3 files  (mp3Files)")
}

当我在游乐场中编写此代码时,它可以工作.
一个例子

var array = ["Apple","Mac","iPhone","iPad Air","Apple","Air","Air"]
var filteredArray = Array(Set(array))

println(filteredArray)

我如何在我的项目中使用它？