在我的应用程序中，用户可以打开相机胶卷选择图片或打开相机直接单独拍摄。
在这两种情况下，所选/拍摄的照片也会保存在本地以供进一步参考。
缺点是保存操作通常会冻结屏幕直到完成。
我找到了一个动画in this post，我想在imagePickerController前面显示它，但我无法这样做。
class SinglePageViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate, UITextFieldDelegate, UINavigationBarDelegate {
var spinner: UIActivityIndicatorView?
lazy var showCameraImagePickerController: UIImagePickerController = {
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .camera
imagePicker.allowsEditing = false
return imagePicker
}()
lazy var showPhotoImagePickerController: UIImagePickerController = {
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .photoLibrary
imagePicker.allowsEditing = false
return imagePicker
}()
@IBOutlet weak var photoButton: UIButton!
@IBAction func onPhotoButton(_ sender: Any) {
self.present(self.showCameraImagePickerController, animated: true, completion: nil)
}
@IBOutlet weak var galleryButton: UIButton!
@IBAction func onGalleryButton(_ sender: Any) {
self.present(self.showPhotoImagePickerController, animated: true, completion: nil)
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
picker.dismiss(animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String: Any]) {
//start animation
let screenSize: CGRect = UIScreen.main.bounds
spinner = UIActivityIndicatorView(frame: CGRect(x: screenSize.width / 2 - 150, y: screenSize.height / 2 - 150, width: 300, height: 300))
spinner?.isHidden = false
spinner?.startAnimating()
spinner?.color = UIColor.red
switch picker {
case showCameraImagePickerController:
// snap pic, save to doc, save to album
self.showCameraImagePickerController.view.addSubview(spinner!)
timer = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: false, block: { _ in
let image = info[UIImagePickerControllerOriginalImage] as? UIImage
if self.saveImage(imageName: "\(self.titleLabel.text!).png", image: image) {
// additionally save to photo album
UIImageWriteToSavedPhotosAlbum(image!, self, #selector(self.image(_:didFinishSavingWithError:contextInfo:)), nil)
print("saved \(self.titleLabel.text!).png")
self.imageView.image = image
}
})
case showPhotoImagePickerController:
//switch pic, save to doc. no album
self.showPhotoImagePickerController.view.addSubview(spinner!)
timer = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: false, block: { _ in
let image = info[UIImagePickerControllerOriginalImage] as? UIImage
if self.saveImage(imageName: "\(self.titleLabel.text!).png", image: image) {
print("saved new \(self.titleLabel.text!).png")
self.imageView.image = image
self.spinner?.stopAnimating()
self.spinner?.removeFromSuperview()
self.spinner = nil
self.showPhotoImagePickerController.dismiss(animated: true, completion: nil)
} else {
self.spinner?.stopAnimating()
self.spinner?.removeFromSuperview()
self.spinner = nil
self.showPhotoImagePickerController.dismiss(animated: true, completion: nil)
}
})
default:
return
}
}
@objc func image(_ image: UIImage, didFinishSavingWithError error: NSError?, contextInfo: UnsafeRawPointer) {
spinner?.stopAnimating()
spinner?.removeFromSuperview()
spinner = nil
self.showCameraImagePickerController.dismiss(animated: true, completion: nil)
}
func saveImage(imageName: String, image: UIImage?) -> Bool {
//create an instance of the FileManager
let fileManager = FileManager.default
//get the image path
let imagePath = (NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString).appendingPathComponent(imgDir + imageName)
print(imagePath)
//get the image we took with camera
let image = rotateImage(image: image!)
//get the PNG data for this image
let data = UIImagePNGRepresentation(image)
//store it in the document directory
if fileManager.createFile(atPath: imagePath as String, contents: data, attributes: nil) {
newItem?.image = true
return true
} else {
print("error while saving")
return false
}
}
}
你可以看到我尝试使用bringSubView(toFront:)和zPosition但没有结果。
关注this similar question我查看了cameraOverlayView的文档，但它说只有当imagePicker以相机模式呈现时才有效，但这并不包括打开照片库时的情况< / p>
我最近也尝试使用一种解决方法，这意味着我会尽快关闭imagePickerController并在之后更新图像，但由于app的结构发生了一些变化，这不再是最优的了。
修改
让自己更清楚我会再次说明我需要的东西：只要我点击照片选择它，直到我完成保存，就会显示imagePicker的微调动画在前面然后关闭imagePicker。 我不想首先关闭选择器，然后在主视图中显示微调器时保存。
EDIT2 使用答案中的新代码更新代码。唯一的问题是，如果我没有设置计时器，微调器只会在保存过程结束时显示自己一小段时间（使用断点检查）。 这导致在保存过程的几秒钟内没有动画，并且在解除imagePicker之前只是在最后显示微调器。 只需要0.1秒的延迟就会立即触发微调器并获得预期的行为（保存时动画）。 不知道为什么
答案 0 :(得分：0)
请参阅完整示例，其中微调器将在保存图像时显示，一旦完成保存，微调器将被删除。
class ViewController: UIViewController {
/// Image picker controller
lazy var imagePickerController: UIImagePickerController = {
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .photoLibrary;
imagePicker.allowsEditing = false
return imagePicker
}()
var spinner: UIActivityIndicatorView?
@IBAction func imagePickerButton(_ sender: UIButton) {
self.present(self.imagePickerController, animated: true, completion: nil)
}
}
// MARK: ImagePicker Delegate to get the image picked by the user
extension ViewController: UINavigationControllerDelegate, UIImagePickerControllerDelegate {
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
//start animation
let screenSize: CGRect = UIScreen.main.bounds
spinner = UIActivityIndicatorView(frame: CGRect(x: screenSize.width/2 - 50, y: screenSize.height/2 - 50, width: 100, height: 100))
spinner?.isHidden = false
spinner?.startAnimating()
spinner?.color = UIColor.black
self.imagePickerController.view.addSubview(spinner!)
let image = info[UIImagePickerControllerOriginalImage] as? UIImage
UIImageWriteToSavedPhotosAlbum(image!, self, #selector(image(_:didFinishSavingWithError:contextInfo:)), nil)
}
@objc func image(_ image: UIImage, didFinishSavingWithError error: NSError?, contextInfo: UnsafeRawPointer) {
spinner?.stopAnimating()
spinner?.removeFromSuperview()
spinner = nil
self.imagePickerController.dismiss(animated: true, completion: nil)
if error == nil {
let ac = UIAlertController(title: "Saved!", message: "Your altered image has been saved to your photos.", preferredStyle: .alert)
ac.addAction(UIAlertAction(title: "OK", style: .default))
present(ac, animated: true)
}
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
picker.dismiss(animated: true, completion: nil)
}
}