如何快速从 UIAlertAction 打开照片库？

Question

我正在制作一个应用程序，用户可以将他的图像添加到表格视图列表中。当他到达视图时，会弹出一个警报、操作表样式，询问他是否要拍照、从库中选择或取消。

我遇到了第二个问题。我可以使用以下代码打开带有按钮的库：

@IBOutlet weak var imageView: UIImageView!

@IBAction func loadPhoto(sender: AnyObject) {
            let pickerC = UIImagePickerController()
            pickerC.delegate = self
            self.presentViewController(pickerC, animated: true, completion: nil)
        }

func imagePickerController(picker: UIImagePickerController!, didFinishPickingMediaWithInfo info: NSDictionary!) {

            self.dismissViewControllerAnimated(true, completion: nil);

            let gotImage = info[UIImagePickerControllerOriginalImage] as UIImage
            imageView.image = gotImage

        }

但是当我尝试将此代码与 UIAlertAction 一起使用时，它不起作用。有人能帮助我吗？

谢谢

Answer 1

class ViewController: UIViewController, UIImagePickerControllerDelegate

然后在code后面写下你要打开UIImagePickerController的地方。

if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary
){
            println("Button capture")

            var imagePicker = UIImagePickerController()
            imagePicker.delegate = self
            imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary;
            imagePicker.allowsEditing = false

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

然后实现下面的delegate方法。

func imagePickerController(picker: UIImagePickerController!, didFinishPickingImage image: UIImage!, editingInfo: NSDictionary!){
    self.dismissViewControllerAnimated(true, completion: { () -> Void in

    })

    imageView.image = image

}