UIImageview在拍摄相机照片后不会更新，但当选择图库图像时，相机照片会显示一秒钟

Question

在设置了代理并被称为"didFinishPickingMediaWithInfo"的图像视图中显示相机捕获的图像时遇到问题。

我有两个按钮用于用户交互(相机图片和来自图库(，一旦我从相机中拍照，然后从图库中选择任何其他图像；显示先前拍摄的相机照片一秒钟。我试着找了很多，但到目前为止没有运气。

谁能告诉我缺了什么吗。以下是供参考的代码。

@IBAction func cameraButtonPressed(_ sender: UIButton) {
self.openCamera()
}
@IBAction func galleryButtonPressed(_ sender: UIButton) {
self.openGallary()
}

override func viewDidLoad() {
super.viewDidLoad()
initialLayout()
}
override func viewWillAppear(_ animated: Bool) {
self.lblPreview.isHidden = true
self.imageTake.isHidden = true
self.uploadButtonOutlet.isHidden = true
}
//
//MARK: - Internal Methods
func initialLayout() {
self.cameraButtonOutlet.layer.cornerRadius = 20
self.galleryButtonOutlet.layer.cornerRadius = 20
self.uploadButtonOutlet.layer.cornerRadius = 20
}

//MARK: - Open the camera
func openCamera(){
if(UIImagePickerController .isSourceTypeAvailable(UIImagePickerController.SourceType.camera)){
imagePicker.sourceType = UIImagePickerController.SourceType.camera
//If you dont want to edit the photo then you can set allowsEditing to false
imagePicker.allowsEditing = true
imagePicker.delegate = self
imagePicker.cameraCaptureMode = .photo
imagePicker.cameraDevice = .rear
self.present(imagePicker, animated: true, completion: nil)
}
else{
let alert  = UIAlertController(title: "Warning", message: "You don't have camera", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
}
//MARK: - Choose image from camera roll
func openGallary(){
imagePicker.sourceType = UIImagePickerController.SourceType.photoLibrary
imagePicker.allowsEditing = true
imagePicker.delegate = self
self.present(imagePicker, animated: true, completion: nil)
}

extension UploadTimesheetViewController: UINavigationControllerDelegate, UIImagePickerControllerDelegate {
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info:  [UIImagePickerController.InfoKey : Any]) {
if let editedImage = info[UIImagePickerController.InfoKey.editedImage] as? UIImage{
self.lblPreview.isHidden = false
self.imageTake.isHidden = false
self.uploadButtonOutlet.isHidden = false
DispatchQueue.main.asyncAfter(deadline: .now() + 1.0, execute: {
self.imageTake.image = editedImage
self.imageTake.setNeedsLayout()
})
// self.imageTake.image = editedImage
}
//Dismiss the UIImagePicker after selection
picker.dismiss(animated: true, completion: nil)
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
picker.isNavigationBarHidden = false
self.dismiss(animated: true, completion: nil)
}
}

我也尝试了以下代码，但仍然是相同的结果。

var finalImage:UIImage?
if let image = info[UIImagePickerController.InfoKey.editedImage] as? UIImage {
finalImage = image
}else {
finalImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage
}
self.lblPreview.isHidden = false
self.imageTake.isHidden = false
self.uploadButtonOutlet.isHidden = false
self.imageTake.image = finalImage
//Dismiss the UIImagePicker after selection
picker.dismiss(animated: true, completion: nil)

Answer 1

延迟1秒后在imageView上设置图像。这就是为什么前面的图像会显示一秒钟。

删除延迟并立即显示图像。像这个

if let editedImage = info[UIImagePickerController.InfoKey.editedImage] as? UIImage {
self.lblPreview.isHidden = false
self.imageTake.isHidden = false
self.uploadButtonOutlet.isHidden = false
self.imageTake.image = editedImage
DispatchQueue.main.asyncAfter(deadline: .now() + 1.0, execute: {
picker.dismiss(animated: true, completion: nil)
})
})