swift - 从 collectionViewCell 类中呈现 UIImagePickerController

Question

我在从 collectionViewCell 呈现 UIImagePicker 时遇到了一些问题。我知道 collectionViewCells 默认情况下不充当选择器委托(delegate)，因此我尝试从 UIViewController 类调用一个方法来操作持有点击的 imageView 的单元格。我的控制台中没有显示任何错误，但是当我运行应用程序并尝试呈现 UIImagePickerController 时，没有任何反应，并且我收到“警告:尝试呈现不在窗口层次结构中的 View !”。我想当用户点击 profileImageView 时呈现 UIImagePickerController。预先感谢您的帮助!

//LoginCell 类持有 imageView 以从 LoginController 类调用 UIImagePickerController 方法

       lazy var profileImageView: UIImageView = {
            let imageView = UIImageView()
         imageView.addGestureRecognizer(UITapGestureRecognizer(target:self, action: #selector(handleSelectProfileImage)))
            imageView.isUserInteractionEnabled = true
            return imageView
        }() 

        var loginController: LoginController?

        func handleSelectProfileImage() {
        let loginController = LoginController()
        loginController.showImagePicker(sendingVC: loginController)
    }

//LoginController 类作为 UIImagePickerController 委托(delegate)

    func showImagePicker(sendingVC: LoginController) {
        let picker = UIImagePickerController()

        picker.delegate = self
        picker.allowsEditing = true

        present(picker, animated: true, completion: nil)

    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
            let loginCell = collectionView.dequeueReusableCell(withReuseIdentifier: loginCellId, for: indexPath) as! LoginCell
            loginCell.delegate = self
            return loginCell
 }

Answer 1

在你的手机中试试这个:

func handleSelectProfileImage() {

    guard let loginController = delegate as? LoginViewController else {
        return
    }

    loginController.showImagePicker()
}

在您的 LoginController 中

func showImagePicker() {

    let picker = UIImagePickerController()

    picker.delegate = self
    picker.allowsEditing = true

    present(picker, animated: true, completion: nil)
}