Xcode 7.1 beta：文件内容错误

我刚刚完成了我的 swift 应用程序的最后润色。但升级到 Beta 7 后，它给了我“ContentOfFile”字符串错误。谁能帮我理解如何解决这个问题？

这是我的 ATM 机。

//Reads the Text File
    if var path = NSBundle.mainBundle().pathForResource("Chapters", ofType: "txt"){

        //Reads the Text File into one Huge String
        var data = String(contentsOfFile:path, encoding: NSUTF8StringEncoding, error: nil)

            //sets String content of the Text File as an Array. With each string start at \n (new line)
            if var content = (data){

                //from the mass string of data from the text file, Each chapter content is seperated by #
                var Chapters: [String] = content.componentsSeparatedByString("@")

                //without removing index in the beginning there will be an extra element printed in the array.
                Chapters.removeAtIndex(0)

错误信息：无法使用类型为“（contentsOfFile：String，编码：UInt，错误：NilLiteralConvertible）”的参数列表调用类型“String”的初始值设定项

您需要实现 do try catch 错误处理。尝试这样：

编辑/更新：

Swift 3或稍后

if let fileURL = Bundle.main.url(forResource: "Chapters", withExtension: "txt") {
    do {
        let string = try String(contentsOf: fileURL, encoding: .utf8)
        var chapters = string.components(separatedBy: "@")
        chapters.removeFirst()
    } catch {
        print(error)
    }
}