How to read a playground text resource files with Swift 2 and Xcode 7

Question

Xcode 7 Playgrounds now supports loading files from the nested Resources directory.

I can get SKScene(fileNamed: "GameScene") when I have a GameScene.sks in my Resources or NSImage(named:"GameScene.png") if I have a GameScene.png in your Resources.

But how can I read a regular text file from the Playground Resources directory as well?

Answer 1

We can use the Bundle.main

So, if you have a test.json in your playground like

You can access it and print its content like that:

// get the file path for the file "test.json" in the playground bundle
let filePath = Bundle.main.path(forResource:"test", ofType: "json")

// get the contentData
let contentData = FileManager.default.contents(atPath: filePath!)

// get the string
let content = String(data:contentData!, encoding:String.Encoding.utf8)

// print
print("filepath: \(filePath!)")

if let c = content {
    print("content: \n\(c)")
}

Will print

filepath: /var/folders/dm/zg6yp6yj7f58khhtmt8ttfq00000gn/T/com.apple.dt.Xcode.pg/applications/Json-7800-6.app/Contents/Resources/test.json
content: 
{
    "name":"jc",
    "company": {
        "name": "Netscape",
        "city": "Mountain View"
    }
}

Answer 2

Swift 5

It is possible to get to files in your Resources folder by the bundle in a Playground.

import UIKit

Here are two ways to get the JSON data.

Path:

    guard let path = Bundle.main.path(forResource:"test", ofType: "json"),
    let data = FileManager.default.contents(atPath: path) else {
        fatalError("Can not get json data")
    }

URL:

    guard let url = Bundle.main.url(forResource:"test", withExtension: "json") else {
            fatalError("Can not get json file")
    }
    if let data = try? Data(contentsOf: url) {
        // do something with data
    }

Answer 3

You can use String directly with a URL. Example in Swift 3:

let url = Bundle.main.url(forResource: "test", withExtension: "json")!
let text = String(contentsOf: url)

Answer 4

Another short way (Swift 3):

let filePath = Bundle.main.path(forResource: "test", ofType: "json")
let content: String = String(contentsOfFile: filePath!, encoding: .utf8)

Answer 5

Jeremy Chone's answer, updated for Swift 3, Xcode 8:

// get the file path for the file "test.json" in the playground bundle
let filePath = Bundle.main.path(forResource: "test", ofType: "json")

// get the contentData
let contentData = FileManager.default.contents(atPath: filePath!)

// get the string
let content = String(data: contentData!, encoding: .utf8)


// print
print("filepath: \(filePath!)")

if let c = content {
    print("content: \n\(c)")
}

Answer 6

Added try for swift3.1:

let url = Bundle.main.url(forResource: "test", withExtension: "json")!
// let text = String(contentsOf: url)
do {
    let text = try String(contentsOf: url)
    print("text: \n\(text)")
}
catch _ {
    // Error handling
}

// --------------------------------------------------------------------
let filePath2 = Bundle.main.path(forResource: "test", ofType: "json")
do {
    let content2: String = try String(contentsOfFile: filePath2!, encoding: .utf8)
    print("content2: \n\(content2)")

}
catch _ {
    // Error handling
}