xcode,ios8, swift, files and arrays

Question

I am trying to add persistance to my application, so i have to read and write to a file

This is the code i use to read:

let path = NSBundle.mainBundle().pathForResource("Data", ofType: "txt")
var text = String(contentsOfFile: path!, encoding: NSUTF8StringEncoding, error: nil)!

and this is the line I use to write

text.writeToFile(path!, atomically: false, encoding: NSUTF8StringEncoding, error: nil)

Here happens something strange,there is no Data.txt file in my project folder but it works.Why?

To solve this i deleted some folders,created a Data.txt file in the project folder and the app work fine but i cannot see the data stored in the txt file,why?And if i delete the file the app doesn't show errors and continues to work even if i moved to thrash the file.How is it possible?How can I edit or delete this file before it's loaded in the application?

Another issue I have is that i would like to use an array instead of a big string,the array should be like this

var array = [(number:Int(),name:String(),date:String())]

the txt file has the following structure number\tname\tdate\nnumber\tname\tdate and so on

I don't know how to split the different lines of the file into an array and the 3 elements of the line into an element of the array using "\n" as separator for the elements and \t to separate the Int and the two Strings

And I don't know how to save the array in the txt file and reload it,do I have to use some for cycle or some while or there is some function specific for my case?

Thanks

Leo Dabus · Accepted Answer · 2015-02-16 16:32:36Z

3

You won't be able to save a tuple using NSUserDefaults, so I think you should use a subarray to group your data before storing it:

class Load {
    class func array(key:String) -> [AnyObject]! {
        return NSUserDefaults.standardUserDefaults().arrayForKey(key)
    }
}
class Save {
    class func array(key:String, _ value:[AnyObject]){
        NSUserDefaults.standardUserDefaults().setObject(value, forKey: key)
    }

}
var number = 15
var name = "John"
var date = NSDate()

var myArray:[[AnyObject]] = []

myArray.append([number,name,date])

Save.array("myArray", myArray)

number = 16
name = "Jane"
date = NSDate().dateByAddingTimeInterval(60*60*24)

myArray.append([number,name,date])
Save.array("myArray", myArray)


let loadedArray = Load.array("myArray")

answered Feb 16, 2015 at 16:32

Leo Dabus

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