在將圖像加載到視圖控制器之前，如何裁剪圖像

Question

在我的視圖控制器中，我的UIImageView設置為370x370，當我加載圖像時，它當前會拉伸以適合ImageView。

這是我目前用於選擇圖像的內容：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    // Runs when user is picking image from library
    if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
        self.previewImageView.image = pickedImage
        self.selectImageButton.isEnabled = false
        self.selectImageButton.isHidden = true
        uploadImage(image: pickedImage)
        picker.dismiss(animated: true, completion: nil)
    }
}

我對Swift還是很陌生，最好是在我的代碼中實現圖像裁剪？

Answer 1

調用ImagePicker函數時，請將allowEditing設置為true：

self.imagePicker.allowsEditing = true
self.imagePicker.sourceType = .camera
self.present(self.imagePicker, animated: true, completion: nil)

另一個選擇是，如果您想要更多的自定義，則可以使用以下庫： https : //github.com/TimOliver/TOCropViewController

在didFinishPickingMediaWithInfo中，您可以執行以下操作：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage{
        dismiss(animated: true, completion: nil)
        let cropVC = TOCropViewController(image: pickedImage)
        cropVC.delegate = self
        cropVC.aspectRatioPickerButtonHidden = true
        cropVC.aspectRatioPreset = .presetSquare
        cropVC.aspectRatioLockEnabled = true
        cropVC.resetAspectRatioEnabled = false
        self.present(cropVC, animated: true, completion: nil)
    }
}