我已经使用了UIImagePickerController。此代码在Xcode11.3中已经可以正常工作。但当我在Xcode12上运行图像选择器时，委托没有调用Xcode12。
/// Picked Image
struct PickedImage {
var image: UIImage?
var api: String?
}
/// Image picker
class ImagePicker: NSObject {
typealias ImagePickerHandler = ((_ selected: PickedImage) -> ())
private weak var presentationController: UIViewController?
let pickerController: UIImagePickerController = UIImagePickerController()
var apiKey: String?
private var handler: ImagePickerHandler? = nil
private func action(for type: UIImagePickerController.SourceType, title: String) -> UIAlertAction? {
guard UIImagePickerController.isSourceTypeAvailable(type) else {
return nil
}
return UIAlertAction(title: title, style: .default) { (action) in
DispatchQueue.main.async {
self.pickerController.mediaTypes = ["public.image"]
self.pickerController.sourceType = type
self.pickerController.delegate = self
self.presentationController?.present(self.pickerController, animated: true, completion: {
})
}
}
}
/// Present source view
/// - Parameter sourceView: view
func present(presentationController: UIViewController, completed: ImagePickerHandler? = nil) {
self.handler = completed
self.presentationController = presentationController
// self.delegate = delegate
let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
if let action = self.action(for: .camera, title: "Take photo") {
alertController.addAction(action)
}
if let action = self.action(for: .savedPhotosAlbum, title: "Camera roll") {
alertController.addAction(action)
}
if let action = self.action(for: .photoLibrary, title: "Photo library") {
alertController.addAction(action)
}
alertController.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
// if UIDevice.current.userInterfaceIdiom == .pad {
// alertController.popoverPresentationController?.sourceView = sourceView
// alertController.popoverPresentationController?.sourceRect = sourceView.bounds
// alertController.popoverPresentationController?.permittedArrowDirections = [.down, .up]
// }
self.presentationController?.present(alertController, animated: true)
}
private func pickerController(didSelect image: UIImage?, imageURL: URL?) {
pickerController.dismiss(animated: true, completion: nil)
// self.delegate?.imagePicker(picker: self, didSelected: image, apikey: apiKey)
handler?(PickedImage(image: image, api: apiKey))
}
}
/// ImagePicker controller delegate
extension ImagePicker: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
self.pickerController(didSelect: nil, imageURL: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
self.pickerController(didSelect: info[.originalImage] as? UIImage, imageURL: info[.imageURL] as? URL)
}
}
当我检查委托是否已应用断点时。类似控制台意味着
po imagepicker.delegate
在图像选取器代理工作正常之后。但当我删除断点时，它的委托不会调用。
我不知道是什么原因。为什么不起作用。我可以知道如何解决这个问题吗。
这很可能是因为您没有在变量中保留选择器控制器。一旦您的函数完成，它就会被解除分配。
例如，我有这样的东西：
class MyClass: UIImagePickerControllerDelegate {
let imagePicker = UIImagePickerController()
}
func pickImageFromGallery() {
self.imagePicker.delegate = self
self.imagePicker.sourceType = UIImagePickerController.SourceType.photoLibrary
self.imagePicker.allowsEditing = false
self.present(self.imagePicker, animated: true, completion: nil)
}
... and the delegate methods as well
有什么理由不把pickerController.delegate = self放在self.presentationController?.present(pickerController, animated: true, completion: {})'之前吗？
如果没有，也许您可以将pickerController.delegate = self放在它之前，然后重试。
您的代码总是错误的；如果它真的成功了，那就太幸运了：
let pickerController: UIImagePickerController = UIImagePickerController()
pickerController.mediaTypes = ["public.image"]
pickerController.sourceType = "Photo library"
self.presentationController?.present(pickerController, animated: true, completion: {
pickerController.delegate = self
})
更改为：
let pickerController: UIImagePickerController = UIImagePickerController()
pickerController.mediaTypes = ["public.image"]
pickerController.sourceType = .photoLibrary
pickerController.delegate = self
self.present(pickerController, animated: true)
我认为你犯了一个愚蠢的错误。只要更改几行代码，就可以开始了。
只需按照我的步骤
=>这里ProfileViewController是我的UIViewController，我将在这里从Gallery中选择图像并将图像设置为UIImageView。您必须在想要拾取图像的位置使用UIViewController。
ProfileViewController: UIViewController{
let pickerController = UIImagePickerController()
viewDidLoad(){
}
@IBAction func pickImageAction(sender: UIButton){
self.openImagePicker()
}
func openImagePicker()
{
pickerController.delegate = self
pickerController.allowsEditing = true
pickerController.mediaTypes = ["public.image", "public.movie"]
pickerController.sourceType = .photoLibrary // Pick image from PhotoLibrary
//pickerController.sourceType = .savedPhotosAlbum // Pick Saved Images
//pickerController.sourceType = .camera // Click Image using Camera
self.present(pickerController, animated: true)
} //End of setupImagePicker
} // End of ProfileViewController
// MARK:- Delegate method for UIImagePicker
extension ProfileViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
guard let image = info[.editedImage] as? UIImage else { return }
// image is your image which you picked from Image Gallery or using Camera.
// you can set this image directly to your UIImageView.
// self.yourImageView.image = image
// or you can compress this image, converting to JPG image type.
// compressionQuality will reduce your image quality and Image Size.
if let jpegData = image.jpegData(compressionQuality: 0.8) {
// you can use this compressed image.
}
self.dismiss(animated: true)
}// End of didFinishPickingMediaWithInfo
} // End of Extension