Swift 2.0 code works in Xcode but not in Playground

Question

I\'m learning Swift and have been frustrated trying to figure out how I\'m unable to load files. It turns out that the code works in Xcode but does not work in a playground.

Answer 1

Might be a permission problem. Probably in your XCode project you have a set of privileges which are not available in playground.

Answer 2

If you go to the menu

"View" -> "Debug Area" -> "Show Debug Area"

you will see the full error: "you don't have permissions to access the filesystem from the Playground*."

The workaround is to include the file in the Playground using its Project Navigator.

Go to the menu

"View" -> "Navigators" -> "Show Project Navigator"

then drag and drop your file into the "Resources" folder.

Then use NSBundle to get the path.

func testFileLoad() {

    // get the file path for the file from the Playground's Resources folder
    guard let path = NSBundle.mainBundle().pathForResource("test", ofType: "txt") else {
            print("Oops, the file is not in the Playground")
            return
    }

    // keeping the examples from your question
    let s: String = try! String(contentsOfFile: path, encoding: NSUTF8StringEncoding)
    print(s)

    do {
        let p: String = try String(contentsOfFile: path, encoding: NSUTF8StringEncoding)
        print(p)
    } catch {
        print("nope")
    }

}

testFileLoad()

*Actually you have only access to the /var/ folder containing your Playground shared data, and the Playground is just offering a shortcut. This folder in the Playground's navigator actually represents the /var/ folder, and is unique for each Playground. You can see its address with NSBundle:

NSBundle.mainBundle().resourcePath