Xcode 6.1 componentsSeparatedByCharacterInSet编译器错误

Question

to be able to deploy an App onto an iPhone with IOS 8.1 I updated Xcode 6.0.1 to 6.1. 为了能够使用IOS 8.1将应用程序部署到iPhone，我将Xcode 6.0.1更新为6.1。

With this step I got a couple of compiler errors, eg 通过这一步，我遇到了一些编译器错误，例如

var lines : NSArray = mydata.componentsSeparatedByCharactersInSet(NSCharacter.newlineCharacterSet())

Error: 错误：

Cannot convert the expression's type '$T6??' 无法转换表达式的类型'$ T6 ??' to type '[AnyObject]' 键入“ [AnyObject]”

What is '$T6?? 什么是“ $ T6”？

Answer 1

Figured out that I need an explicit cast as [NSArray] 弄清楚我需要显式转换为[NSArray]

var lines : NSArray = mydata.componentsSeparatedByCharactersInSet(NSCharacter.newlineCharacterSet()) as [NSArray]

But still don't know, what '$T6??' 但还是不知道，'$ T6？' stands for. 代表。 Google did not help. Google没有帮助。