Ios xcode7beta给出了错误消息。

它以前工作过。但是在Xcode 7测试版中给出了错误。请帮帮我

private func htmlStringWithFilePath(path: String) -> String? {

        // Error optional for error handling
        var error: NSError?

        // Get HTML string from path
        let htmlString = NSString(contentsOfFile: path, encoding: NSUTF8StringEncoding, error: &error)

        // Check for error
        if let error = error {
            printLog("Lookup error: no HTML file found for path, \(path)")
        }

        return htmlString! as String
    }

现在给出2个错误

让htmlString=NSString（内容文件：路径，编码： NSUTF8StringEncoding，错误：&错误）错误找不到 接受参数列表的NSString类型的初始值设定项 类型（…）

printLog（“查找错误：找不到路径（path）”的HTML文件） 使用未解析标识符printlog时出错

---

在Swift 2中，有一个新的错误处理模型，带有try-and-catch（几乎在整个基金会/Cocoa中）。以下是一个工作示例：

private func htmlStringWithFilePath(path: String) -> String? {

    // Get HTML string from path
    // you can also use String but in both cases the initializer throws
    // so you need the do-try-catch syntax
    do {
        // use "try"
        let htmlString = try String(contentsOfFile: path, encoding: NSUTF8StringEncoding)
        // or directly return
        return htmlString

    // Check for error
    } catch {
        // an "error" variable is automatically created for you

        // in Swift 2 print is now used instead of println.
        // If you don't want a new line after the print, call: print("something", appendNewLine: false)
        print("Lookup error: no HTML file found for path, \(path)")
        return nil
    }
}