ios chooseimage ios

实现iOS选择图片的流程及代码示例

流程表格

步骤	操作
1	导入相册选择框架
2	请求用户授权访问相册
3	弹出相册选择界面
4	选择图片
5	返回选择的图片

操作步骤及代码示例

1. 导入相册选择框架

// 在你的ViewController类中导入相册选择框架
import Photos

2. 请求用户授权访问相册

// 请求相册访问权限
PHPhotoLibrary.requestAuthorization { (status) in
    if status == .authorized {
        // 用户已授权访问相册
    } else {
        // 用户未授权访问相册
    }
}

3. 弹出相册选择界面

// 弹出相册选择界面
let imagePicker = UIImagePickerController()
imagePicker.sourceType = .photoLibrary
imagePicker.delegate = self
self.present(imagePicker, animated: true, completion: nil)

4. 选择图片

// 实现UIImagePickerControllerDelegate协议方法，处理用户选择图片的操作
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    if let pickedImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage {
        // 处理选择的图片
    }
    picker.dismiss(animated: true, completion: nil)
}

5. 返回选择的图片

// 在处理选择的图片后，将其返回给需要使用的地方
// 可以将选择的图片赋值给一个UIImageView或者上传到服务器等操作

类图

classDiagram
    class ViewController {
        UIImagePickerControllerDelegate
        imagePickerController(UIImagePickerController, didFinishPickingMediaWithInfo: [UIImagePickerController.InfoKey : Any])
    }
    class PHPhotoLibrary {
        + requestAuthorization(completionHandler: @escaping (PHAuthorizationStatus) -> Void)
    }
    class UIImagePickerController {
        - sourceType
        - delegate
        - present(animated: Bool, completion: (() -> Void)?)
        - dismiss(animated: Bool, completion: (() -> Void)?)
    }
    class UIImage {
        + UIImage
    }
    ViewController <|-- UIImagePickerControllerDelegate
    ViewController "1" o-- "1" PHPhotoLibrary : uses
    ViewController "1" o-- "1" UIImagePickerController : creates
    UIImagePickerController <|-- UIImagePickerControllerDelegate
    UIImagePickerController "1" o-- "1" UIImage

关系图

erDiagram
    PHPhotoLibrary {
        PHAuthorizationStatus
    }
    UIImagePickerController {
        UIImagePickerController.InfoKey
    }
    ViewController {
        UIImagePickerControllerDelegate
        PHPhotoLibrary
        UIImagePickerController
        UIImage
    }

通过上述步骤，你可以成功实现iOS选择图片的功能。希望这篇文章对你有帮助，祝你在iOS开发中取得更多进步！