Ios 在将图像加载到视图控制器之前，如何裁剪图像

在我的视图控制器中，我的UIImageView设置为370x370，当我加载图像时，它当前会拉伸以适合ImageView

这是我目前用于拾取图像的功能：

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)
    }
}

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我是Swift的新手，最好是在代码中实现图像裁剪？

调用ImagePicker函数时，将allowsEditing设置为true：

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

另一个选项是，如果需要更多的自定义，可以使用此库：

在didFinishPickingMediaWithInfo中，您可以执行以下操作：

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)
    }
}

---

调用ImagePicker函数时，将allowsEditing设置为true：

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

另一个选项是，如果需要更多的自定义，可以使用此库：

在didFinishPickingMediaWithInfo中，您可以执行以下操作：

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)
    }
}

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你确定要修剪吗？听起来您确实想将imageView内容模式设置为Aspect Fit。（UIImageView，属性为contentMode，值为aspectFit。）这不是逻辑。确实要裁剪吗？听起来您确实想将imageView内容模式设置为Aspect Fit。（UIImageView，属性为contentMode，值为aspectFit。）这不是逻辑。