如何在NSUserDefaults中设置数组的数组？

Question

I want to set an array of arrays with NSUserDefaults like this:

let array = [["Mexico","USA","Canada"],["Mexico City","Washington","Ottawa"]]

NSUserDefaults.standardUserDefaults().setObject(array, forKey:"Countries")

Then I try to access it

var recalledArray = NSUserDefaults.standardUserDefaults().objectForKey("Countries") as! NSArray
println(recalledArray)

But this is what the console prints:

(
    "\U00bfMexico",
    "\U00bfUSA",
    "Canada"
)

I only get the first array, missing the second one:

["Mexico City","Washington","Ottawa"]

Why am I only getting back the first array? How do I get back both the arrays?

Answer 1

我很抱歉，还有另一个问题，我正在检查应用程序是否首先启动，然后如果没有保存则保存NSUserDefaults，然后不要再次保存它，因此我在模拟器上运行应用程序后添加了第二个数组，因此代码从未保存到NSUserDefaults ，但无论如何，谢谢您的帮助