如何快速从另一个类访问字符串？

Question

I have two classes , one is called the ViewController which looks like this

 import UIKit

 class ViewController: UIViewController {

 let demoURLs = DemoURLs
 let ImgURL = NSURL(string: demoURLs.photoURL)



override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

}

The demoURLs.swift file looks like this

  import Foundation

  struct DemoURLs{
  var photoURL = " xyz " }

But I get an error. I understand that my method is incorrect. What is the correct way of accessing this string , so that I can use it in an NSString ? My final aim is to inflate an imageView with an image from this URL.

Answer 1

The way you are instantiating the struct is incorrect. Change

let demoURLs = DemoURLs

to

let demoURLs = DemoURLs()  // the () calls init()

and you will be able to access the members of the struct.

Answer 2

struct DemoURLs {
 static var photoURL = " xyz " 
}

should do the job.

To read, from any class use:

let myString = DemoURLs.photoURL

To write:

DemoURLs.photoURL = "new name for xyz"