Swift 所选图像不会更改以前显示的图像

我有一个简单的设置，可以从相机或照片库中选择图像。当我选择一张新照片时，它不会改变应用程序加载的原始照片

我认为这和层次结构有关，不确定我是否用正确的代码术语使用了它。我将代码作为所选图像读取，然后将变量originalImage设置为所选图像。所以这应该是正确的吗？好吧，扰流板，我错了

import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    var originalImage = UIImage(named: "crossSection2.jpg")!

    @IBOutlet weak var imageView: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()
        imageView.image = originalImage
    }
    @IBAction func onCameraClicked(_ sender: Any) {
        let ac = UIAlertController(title: "Choose Image", message: nil, preferredStyle: .actionSheet)
        ac.addAction(UIAlertAction(title: "Camera", style: .default, handler: { (action) in
            self.showPicker(sourceType: .camera)
        }))
        ac.addAction(UIAlertAction(title: "Library", style: .default, handler: { (action) in
            self.showPicker(sourceType: .photoLibrary)
            }))
        ac.addAction(UIAlertAction(title: "Cancel", style: .default, handler: nil))
        self.present(ac, animated: true, completion: nil)
    }

    func showPicker(sourceType: UIImagePickerController.SourceType) {
        let picker = UIImagePickerController()
        picker.delegate = self
        picker.sourceType = sourceType
        self.present(picker, animated: true, completion: nil) 
    }
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingImage newImage : UIImage, editingInfo: [String : AnyObject]?) {
        dismiss(animated: true, completion: nil)
        self.originalImage = newImage
        self.imageView.image = newImage
    }
}

---

您需要更新UIImageView，而不仅仅是原始图像。尝试：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingImage newImage : UIImage, editingInfo: [String : AnyObject]?) {
    dismiss(animated: true, completion: nil)
    self.originalImage = newImage
    self.imageView.image = newImage
}

从

不推荐使用imagePickerController:didFinishPickingMediaWithInfo: 相反

因此，请尝试将代码更改为：

  func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
         dismiss(animated: true, completion: nil)
        self.originalImage = info[.originalImage] as! UIImage
        self.imageView.image = (info[.originalImage] as! UIImage)
    }

---

那是有道理的，不是吗。问了这个问题后，我碰巧试了一下，但还是不起作用。还有其他想法吗？好的，我以前没有注意到。控制台中出现布局约束错误。[LayoutConstraints]无法同时满足约束。可能下面列表中至少有一个约束是您不想要的。尝试以下方法：1查看每个约束条件，并尝试找出您不期望的约束条件；2找到添加了不需要的约束的代码并修复它。我取出约束，运行它，更新它，运行它，两者都不起作用。我不应该使用安全区域吗？我将所有四个约束都设置为0。不知道为什么我还是会犯这个错误。谢谢你，就是这样！非常感谢