UIAlertView问题

Question

自从我更新到Xcode8后，我就开始遇到这个问题了，我不知道它是否是由于Xcode的一个bug造成的。

我有这个问题：this happens when I add this view to a tab bar。

它应该是如此的if you do not tie it to anything it remains unchanged。

问题不是我在下面添加的代码

import UIKit

类PhotoSelectViewController: UIViewController，UINavigationControllerDelegate，UIImagePickerControllerDelegate {

@IBOutlet weak var imageView: UIImageView!
@IBOutlet weak var selectImageButton: UIButton!

weak var delegate: PhotoSelectViewControllerDelegate?

override func viewDidLoad() {
    super.viewDidLoad()
}

@IBAction func selectImageTapped(_ sender: AnyObject) {
    let imagePicker = UIImagePickerController()
    imagePicker.delegate = self

    let actionSheet = UIAlertController(title: "Choose image source", message: nil, preferredStyle: .actionSheet)

    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)

    let photoLibraryAction = UIAlertAction(title: "Photo Library", style: .default) { (_) in
        imagePicker.sourceType = .photoLibrary
        self.present(imagePicker, animated: true, completion: nil)
    }
    let cameraAction = UIAlertAction(title: "Camera", style: .default) { (_) in
        imagePicker.sourceType = .camera
        self.present(imagePicker, animated: true, completion: nil)
    }

    actionSheet.addAction(cancelAction)

    if UIImagePickerController.isSourceTypeAvailable(.photoLibrary) {
        actionSheet.addAction(photoLibraryAction)
    }
    if UIImagePickerController.isSourceTypeAvailable(.camera) {
        actionSheet.addAction(cameraAction)
    }

    self.present(actionSheet, animated: true, completion: nil)

    selectImageButton.setTitle("", for: .normal)

}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
        imageView.image = image
        delegate?.photoSelectViewControllerSelectedImage(image: image)
    }
    dismiss(animated: true, completion: nil)
}

}

协议类:PhotoSelectViewControllerDelegate{ func photoSelectViewControllerSelectedImage(镜像: UIImage) }

Answer 1

iOS 8中不推荐使用UIAlertView。

现在您需要使用UIAlertController：

    let alertController = UIAlertController(title: "Choose image source", message: "", preferredStyle: .actionSheet)

    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { result in
        print("Destructive")
    }

    // Replace UIAlertActionStyle.Default by UIAlertActionStyle.default
    let photoLibraryAction = UIAlertAction(title: "Photo Library", style: .default) { result in
        print("OK")
    }

    alertController.addAction(cancelAction)
    alertController.addAction(photoLibraryAction)
    self.present(alertController, animated: true)

​

​

Answer 2

UIAlertView已弃用。在iOS 8上使用preferredStyle为UIAlertControllerStyleAlert的UIAlertController，你可以这样做

let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)