文本文件到字符串数组代码在Playground中有效，但在Xcode项目中无效

Question

I have the following code which creates a string array of a text file named num.txt

import Foundation
import UIKit

func linesFromResource(fileName: String) throws -> [String] {

    guard let path = NSBundle.mainBundle().pathForResource("num", ofType: "txt") else {
        throw NSError(domain: NSCocoaErrorDomain, code: NSFileNoSuchFileError, userInfo: [ NSFilePathErrorKey : fileName ])
    }
    let content = try String(contentsOfFile: path, encoding: NSUTF8StringEncoding)
    return content.componentsSeparatedByString("\n")
}

let lines = try linesFromResource("num.txt")
print(lines)

my file num.txt is located in the resource folder of the playground

And it works fine and does what is intended, but when I try to do exactly the same thing in a project it gives me this error message:

For some reason in the project the file "num.txt" can't be called I've tried creating a Resources folder and putting the file there but it didn't work either, what am I doing wrong?

Answer 1

Please check that num.txt file is added in the Copy Bundle Resources , To check that go here ProjectModule->Build Phases->Copy Bundle Resources . For getting more idea check image.

Answer 2

I solved the issue, for some reason when I try to compile a command line application for OSX Copying as Bundle resource doesn't work, I tried to do it as a single view application for iOS and then it worked.

I was able to make it run as an OSX command line application as well by adding the file as Copy Files instead of Copy Bundle Resources and by selecting resources as destination, I had tried this before but not without first deleting the derived data and clean building as NDoc suggested so I guess both things together did the trick.

Answer 3

将linesFromResource("num.txt")更改为linesFromResource("num") ，多余的.txt就是问题所在。