ios - 在函数外更改 var 的值

Question

我在类(class)顶部声明了 var imagePicked = 0。现在，当我像这样在 IBAction 中更改 imagePicked 的值时:

import UIKit

ViewController 类: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。我如何更改它的值，以便它不仅在我更改它的函数内部发生变化？

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 用一个 = 而不是双 == 来检查平等。

所以将 imagePicked == 1/imagePicked == 2 更改为 imagePicked = 1/imagePicked = 2在这些功能中，它应该可以工作!