UIImagePickerController 允许选择方形图像。但是我怎样才能使它成为 16:9？

Posted 2023-02-25

【中文标题】UIImagePickerController 允许选择方形图像。但是我怎样才能使它成为 16:9？

【英文标题】：UIImagePickerController allows selecting square images. But how can I make it 16:9?

【发布时间】：2019-04-16 09:06:04

【问题描述】：

我设置了 UIImagePickerController 并添加了代码：

imagePickerController.allowsEditing = true

这允许用户裁剪图像，但比例仅为 1:1。

但是，我想以 16:9 的比例裁剪图像，而不是 1:1。我怎样才能做到这一点？

【参考方案1】：

抱歉，您无法更改默认图像选择器的比例。所以你需要使用其他第三方库。我正在使用下面的库来管理裁剪器，以便您可以使用它。 https://www.cocoacontrols.com/controls/alcameraviewcontroller.

这是管理裁剪比例的代码。

func addImagePickerOnController(callBack: @escaping(_ image:UIImage)-> ()) 
    var croppingParameters: CroppingParameters 
        return CroppingParameters(isEnabled: true, allowResizing: true, allowMoving: true, minimumSize: CGSize(width: 60, height: 60))
    

    let alertController = UIAlertController(title: nil, message: "Choose Image", preferredStyle: .actionSheet)
    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel)  action in
    
    alertController.addAction(cancelAction)

    let cameraAction = UIAlertAction(title: "Camera", style: .default)  action in
        let cameraVC = CameraViewController(croppingParameters: croppingParameters, allowsLibraryAccess: false, allowsSwapCameraOrientation: true, allowVolumeButtonCapture: true)  [weak self] image, asset in
            if (image != nil)
                callBack(image!)
            
            self?.dismiss(animated: true, completion: nil)
        
        self.present(cameraVC, animated: true, completion: nil)
    

    let galleryAction = UIAlertAction(title: "Gallery", style: .default)  action in
                let libraryViewController = CameraViewController.imagePickerViewController(croppingParameters: croppingParameters)  [weak self] image, asset in
                    if (image != nil)
                        callBack(image!)
                    
                    self?.dismiss(animated: true, completion: nil)
                

                self.present(libraryViewController, animated: true, completion: nil)
    
    alertController.addAction(cameraAction)
    alertController.addAction(galleryAction)
    self.present(alertController, animated: true)