在Swift中选择照片时“数组索引超出范围”

Question

I cant figure out what's the problem here.

I have 6 images and when i click on them it popsup a image picker. If i choose a photo with a sequence, like 1,2,3,4,5,6... it works. But when i choose the first photo that's not the first one (array[0]), i get an error:

`$"Array index out of range"

Here is my code:

class SecondViewController: UIViewController,UIImagePickerControllerDelegate, UINavigationControllerDelegate {

var imagemEscolhida = -1

@IBOutlet var firstImageView: UIImageView!
@IBOutlet var secondImageView: UIImageView!
@IBOutlet var thirdImageView: UIImageView!
@IBOutlet var fourthImageView: UIImageView!
@IBOutlet var fifthImageView: UIImageView!
@IBOutlet var sixthImageView: UIImageView!


@IBAction func firstImageButton(sender: AnyObject) {

    imagemEscolhida = 1
    abreBibliotecaFotos(imagemEscolhida)

}

@IBAction func secondImageButton(sender: AnyObject) {
    imagemEscolhida = 2
    abreBibliotecaFotos(imagemEscolhida)

}

@IBAction func thirdImageButton(sender: AnyObject) {
    imagemEscolhida = 3
    abreBibliotecaFotos(imagemEscolhida)
}

@IBAction func fourthImageButton(sender: AnyObject) {
    imagemEscolhida = 4
    abreBibliotecaFotos(imagemEscolhida)
}

@IBAction func fifthImageButton(sender: AnyObject) {
    imagemEscolhida = 5
    abreBibliotecaFotos(imagemEscolhida)
}

@IBAction func sixthImageButton(sender: AnyObject) {
    imagemEscolhida = 6
    abreBibliotecaFotos(imagemEscolhida)
}

func abreBibliotecaFotos (img: Int )
{
    imagePicker.allowsEditing = false
    imagePicker.sourceType = .PhotoLibrary

    presentViewController(imagePicker, animated: true, completion: nil)
}



let imagePicker = UIImagePickerController()

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
    if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
        firstImageView.contentMode = .ScaleAspectFit

        restaurante.imagem.insert(pickedImage, atIndex: imagemEscolhida-1)

        switch imagemEscolhida
        {
        case 1:
            firstImageView.image = restaurante.imagem[0]
        case 2:
            secondImageView.image = restaurante.imagem[1]
        case 3:
            thirdImageView.image = restaurante.imagem[2]
        case 4:
            fourthImageView.image = restaurante.imagem[3]
        case 5:
            fifthImageView.image = restaurante.imagem[4]
        case 6:
            sixthImageView.image = restaurante.imagem[5]
        default:
            println("Something else")
        }



        picker.dismissViewControllerAnimated(true, completion: nil)

    }

    dismissViewControllerAnimated(true, completion: nil)
}

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


override func viewDidLoad() {
    super.viewDidLoad()

    imagePicker.delegate = self
}


}

Answer 1

You should initialize the array before you use it in the correct size. I would like to refer to my answer to a really similar question . So initialize it from 0 to 5 at definition then your code should work.

Answer 2

It looks like the restaurante.imagem array is empty and your code crashes because you try to insert something at index which is higher than the maximum index of the array - which is 0 .

The line to blame is:

restaurante.imagem.insert(pickedImage, atIndex: imagemEscolhida-1)