Swift使用UIImagePickerController 从相册选择图片、从相机选择图片

article/2025/10/1 12:18:22

配置：

如果是相机使用，需要在info.plist文件增加使用前应用程序说明；相机使用也是如此。（第二个是CALENDARS权限，打错了；图片是Photo Library Usage Description）
在这里插入图片描述

从相册选择图片：

使用UIImagePickerController进行图片选择需要实现UIImagePickerControllerDelegate, UINavigationControllerDelegate这两个代理。因为图片选择视图控制器属于系统内定义的NavigationController。

import UIKitclass ImageViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {var buttonSelect: UIButton!var imageView: UIImageView!private func initView(){buttonSelect = UIButton(type: .system)buttonSelect.setTitle("Select", for: UIControl.State.normal)buttonSelect.frame = CGRect(x: ((self.view.frame.width / 2) - 35), y: (self.view.frame.width - 200), width: 70, height: 30)buttonSelect.addTarget(self, action: #selector(selectPicture), for: UIControl.Event.touchDown)self.view.addSubview(buttonSelect)imageView = UIImageView(frame: CGRect(x: ((self.view.frame.width / 2) - 120), y: ((self.view.frame.height / 2) + 50), width: 240, height: 240))imageView.image = UIImage(named: "taylor")self.view.addSubview(imageView)}override func viewDidLoad() {super.viewDidLoad()// Do any additional setup after loading the view.initView()}@objc func selectPicture(){// 设置源为相机if UIImagePickerController.isSourceTypeAvailable(.photoLibrary) {//创建图片选择控制器let pickerVC = UIImagePickerController()pickerVC.delegate = self// 设置源为相机pickerVC.sourceType = UIImagePickerController.SourceType.photoLibraryself.present(pickerVC, animated: true, completion: nil)} else {print("------> ERROR")}}func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {print("------> INFO:\(info)")let image: UIImage!image = info[.originalImage] as? UIImageself.imageView.image = imagepicker.dismiss(animated: true, completion: nil)}}

需要说明的是，info这个对象是个数组，里面存放的是原始图片与修改后的图片。例如info[.originalImage]是原始图片。

从相机选择图片：

import UIKitclass ImageViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {var buttonSelect: UIButton!var imageView: UIImageView!private func initView(){buttonSelect = UIButton(type: .system)buttonSelect.setTitle("Select", for: UIControl.State.normal)buttonSelect.frame = CGRect(x: ((self.view.frame.width / 2) - 35), y: (self.view.frame.width - 200), width: 70, height: 30)buttonSelect.addTarget(self, action: #selector(selectPicture), for: UIControl.Event.touchDown)self.view.addSubview(buttonSelect)imageView = UIImageView(frame: CGRect(x: ((self.view.frame.width / 2) - 120), y: ((self.view.frame.height / 2) + 50), width: 240, height: 240))imageView.image = UIImage(named: "taylor")self.view.addSubview(imageView)}override func viewDidLoad() {super.viewDidLoad()// Do any additional setup after loading the view.initView()}@objc func selectPicture(){if UIImagePickerController.isSourceTypeAvailable(.camera) {let pickerVC = UIImagePickerController()pickerVC.delegate = selfpickerVC.sourceType = UIImagePickerController.SourceType.cameraself.present(pickerVC, animated: true, completion: nil)} else {print("------> ERROR")}}func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {print("------> INFO:\(info)")let image: UIImage!image = info[.originalImage] as? UIImageself.imageView.image = imagepicker.dismiss(animated: true, completion: nil)}}

闪光灯开启：

pickerVC.cameraFlashMode = UIImagePickerControllerCameraFlashMode.On

使用后置相机：

if UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Front){pickerVC.cameraDevice = UIImagePickerControllerCameraDevice.Front
}