从图片库拍摄图片或选择图片后，UIImageView不更新为新图像

Question

拍照或从照片库中选择图片后，我试图在UIImageView中填充图像。

这是处理相机和照片库激活的代码：

@IBAction func activateCmera(_ sender: Any) {
    if (UIImagePickerController.isSourceTypeAvailable(.camera)) {
        let imagePicker = UIImagePickerController()
        imagePicker.delegate = self
        imagePicker.sourceType = .camera
        imagePicker.allowsEditing = false
        self.present(imagePicker, animated: true, completion: nil)
    }
}


@IBAction func activatePhotoLib(_ sender: Any) {
    if (UIImagePickerController.isSourceTypeAvailable(.photoLibrary)) {
        let imagePicker = UIImagePickerController()
        imagePicker.delegate = self
        imagePicker.sourceType = .photoLibrary
        imagePicker.allowsEditing = false
        self.present(imagePicker, animated: true, completion: nil)
    }
}

以下是在UIImageView中填充图像的代码：

@IBOutlet weak var imageView: UIImageView!

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    let image = info[UIImagePickerControllerOriginalImage] as! UIImage
    self.imageView.contentMode = .scaleAspectFit
    self.imageView.image = image
    self.dismiss(animated: true, completion: nil);
}

目前，当我用相机拍照或从照片库中选择图像后，我被重定向到应用程序的初始视图，而没有用照片更新UIImageView空间。

任何帮助表示赞赏，谢谢！

Answer 1

在Swift 3您需要通过在plist添加以下keys来访问photoLibrary的权限，并且需要使用适当的delegate方法。

将UIImagePickerControllerDelegate和UINavigationControllerDelegate添加到您的class ，并将imagePicker delegate设置为viewDidLoad并尝试以下代码。

    let imagePicker = UIImagePickerController()

    @IBAction func activatePhotoLib(_ sender: UIButton) { 
    if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.photoLibrary) {
        imagePicker.delegate = self
        imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary;
        imagePicker.allowsEditing = false
        self.present(imagePicker, animated: true, completion: nil)
       } 
     }

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

输出： updated

Answer 2

这似乎是与XCode相关的问题，未能解释imagePickerController函数语法已更改（自Swift 3起）。 您将在网上找到这两种编写函数的方式。 您还可以在XCode中使用两者，而不会出现任何错误。 但是，只有第二个实际上可以正确获取图像。

(Option 1 - doesn't work, but XCode doesn't flag it):
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { }

(Option 2 - this is the right syntax!):
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) { }

Answer 3

**您需要像全局对象一样保存UIImagePickerController，之后，需要将此代码推送到动作函数上**

@objc func getImage() {

    imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary

    imagePicker.allowsEditing = false

    imagePicker.modalPresentationStyle = .overCurrentContext

    present(imagePicker, animated: true)

}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

    if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
    imageView.image = image
 }

self.dismiss(animated: true, completion: nil);

}