在函数外更改 var 的值

Question

我在 class 的顶部声明了 var imagePicked = 0。现在，当我在 IBAction 中更改 imagePicked 的值时，如下所示：

import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

@IBOutlet weak var titelbild: UIButton!
@IBOutlet weak var profilbild: UIButton!


let imagePicker = UIImagePickerController()
var imagePicked = 0



override func viewDidLoad() {
    super.viewDidLoad()


    imagePicker.delegate = self
 //   imagePicker.allowsEditing = false
  //  imagePicker.sourceType = .PhotoLibrary


}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


@IBAction func titelbildtapped(sender: AnyObject) {


 //   if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary){


    imagePicked == 1

        imagePicker.allowsEditing = false
        imagePicker.sourceType = .PhotoLibrary


        self.presentViewController(imagePicker, animated: true, completion: nil)



  //  }


}


@IBAction func profilbildtapped(sender: AnyObject) {


    imagePicked == 2

        imagePicker.allowsEditing = false
        imagePicker.sourceType = .PhotoLibrary


        self.presentViewController(imagePicker, animated: true, completion: nil)

    print ("output")

}





func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {


if imagePicked == 1 {

    titelbild.setImage(pickedImage, forState: UIControlState.Normal)
       // titelbild.imageView?.image = pickedImage

 } else if imagePicked == 2 {
        profilbild.setImage(pickedImage, forState: .Normal)        }

    }
    dismissViewControllerAnimated(true, completion: nil)
}



func imagePickerControllerDidCancel(picker: UIImagePickerController) {
    dismissViewControllerAnimated(true, completion: nil)
}

}

imagePicked 的值似乎仍然是 0 而不是 2。我怎样才能改变它的值，所以它不仅在我改变它的函数内部改变了？

Answer 1

好的。问题出在您的 titelbildtapped / profilbildtapped 函数中。在那里你必须分配值 1 / 2 与单个 = 而不是双 == 检查是否相等。

所以在这些函数中将 imagePicked == 1 / imagePicked == 2 更改为 imagePicked = 1 / imagePicked = 2，它应该可以工作！

在函数外更改 var 的值

Change value of var outside the function

func

ios

swift