ios - 如何在我的应用程序中启用 "Photos"的编辑功能？ [ swift 3]

Question

问题:

即使设置为 true:

imagePicker.allowsEditing = true

它仅显示裁剪功能，适用于 iPhone 尺寸的设备但不适用于 iPad 尺寸的设备(裁剪无法正常工作，它会返回错误的部分图片的一部分)。

如何启用“照片”的编辑功能，以便用户可以使用此裁剪功能？

完成方法:

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {
    isImageChanged = true

    if UIDevice.current.userInterfaceIdiom == .pad {
        //Code for iPad problem
        pictureBox.image = image
    }else{
        pictureBox.contentMode = .scaleAspectFit
        pictureBox.image = image
    }

    self.dismiss(animated: true, completion: nil)
}

调用ImagePickerController

let alertAction2 = UIAlertAction(title: "Library", style:UIAlertActionStyle.default){(UIAlertAction)-> Void in

        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.photoLibrary){
            let imagePicker = UIImagePickerController()
            imagePicker.delegate = self
            imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
            if UIDevice.current.userInterfaceIdiom == .pad {
                imagePicker.allowsEditing = true
            } else if UIDevice.current.userInterfaceIdiom == .phone {
                imagePicker.allowsEditing = true
            }
            self.present(imagePicker, animated: true, completion: nil)
        }
    }

Answer 1

我也遇到了同样的问题，有一个简单的解决方案。在 iPad 上使用 imagePickerController 时，您必须将其呈现为弹出窗 Eloquent 能正常进行编辑。 Source

下面是一些图像来说明编辑的工作原理。

接下来，我们要解决 iPhone 上的 popOver 问题。弹出窗口无法在 iPhone 上显示，因此它只会显示占据整个屏幕的普通选择器。请注意，您可能还想检查您是否也有权访问照片库或相机。 (其代码位于上面提供的链接中。)

@IBAction func selectImagePressed(_ sender: Any) {
        // check if we can access the library first? If no we need to ask again
        picker.allowsEditing = true
        picker.sourceType = .photoLibrary // can be camera or library

        picker.modalPresentationStyle = .popover
        picker.popoverPresentationController?.delegate = self as? UIPopoverPresentationControllerDelegate
        picker.popoverPresentationController?.sourceView =  view

        let screenSize = UIScreen.main.bounds
        let xLocation = (screenSize.width / 100) * 15
        let yLocation = (screenSize.height / 2)
        picker.popoverPresentationController?.sourceRect = CGRect(x: xLocation, y: yLocation, width: 0, height: 0)

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

    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        picker.dismiss(animated: true)
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        if let editedImage = info[UIImagePickerControllerEditedImage] as? UIImage {
            // Use editedImage Here
            self.imageView.image = editedImage
            nextButton.isHidden = false
        }
        else if let originalImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
            // Use originalImage Here
            self.imageView.image = originalImage
            nextButton.isHidden = false
        }
        else {
            if let vc = UIApplication.topViewController() {
                Helper.showAlertMessage(vc: vc, title: "Image Error", message: "An error occured during image selection")
            }
        }

        picker.dismiss(animated: true)
    }