将字符串写入plist文件

Question

我想将数组保存到plist。因此，我已经写了上面这个功能。但是当我运行它时，我得到了上面的错误。

var tasks = [String]()

func addTask(name: String){
    let path = NSBundle.mainBundle().pathForResource("Classes", ofType: "plist")
    let dict = NSDictionary(contentsOfFile: path!)
    dict?.setValue(name, forKey: "AppleDevice")
}

错误：

2015-09-12 21:37:52.383 SB Reminder[12433:2057713] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[__NSCFDictionary setObject:forKey:]: mutating method sent to immutable object'
*** First throw call stack: