我正在编写一个基本的照片应用程序，它允许用户在导航控制器中按下“+”按钮，然后从底部弹出一个 ActionSheet，为用户提供选项，这是一张图片：
我有使用普通按钮让这个应用程序工作的代码，但是当我将它添加到我的这个应用程序的代码中时它崩溃了。这是代码：
import UIKit
class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate
{
@IBOutlet weak var imageView: UIImageView!
@IBAction func addPhoto(sender: UIBarButtonItem)
{
let photoOption = UIAlertController(title: nil, message: "Select an Input Type", preferredStyle: .ActionSheet)
let photoLibraryAction = UIAlertAction(title: "Photo Library", style: .Default) { (alert: UIAlertAction!) -> Void in
println("Photo Library Selected") // Used for debugging
// This code worked in my previous app
let picker = UIImagePickerController()
picker.delegate = self
picker.sourceType = .PhotoLibrary
self.presentViewController(picker, animated: true, completion: nil)
}
let cameraAction = UIAlertAction(title: "Camera", style: .Default) { (alert: UIAlertAction!) -> Void in
println("Camera Selected") // Used for debugging
// This code worked in my previous app
let picker = UIImagePickerController()
picker.delegate = self
picker.sourceType = .Camera
self.presentViewController(picker, animated: true, completion: nil)
}
let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel, handler: nil)
photoOption.addAction(photoLibraryAction)
photoOption.addAction(cameraAction)
photoOption.addAction(cancelAction)
self.presentViewController(photoOption, animated: true, completion: nil)
}
func imagePickerController(picker: UIImagePickerController!, didFinishPickingMediaWithInfo info: [NSObject: AnyObject]!)
{
imageView.image = info[UIImagePickerControllerOriginalImage] as? UIImage
dismissViewControllerAnimated(true, completion: nil)
}
}
奇怪的是，在我运行它并且应用程序崩溃之后，我又回到了代码正常工作并且应用程序仍然崩溃的时候。