iOS SDK - 使用 UIImagePickerController 时如何恢复状态栏

IOS

如何在使用IOS SDK中的UIImagePickerController时恢复状态栏？

在IOS开发中，我们经常会使用UIImagePickerController来实现照片选择和拍摄功能。然而，当我们使用UIImagePickerController时，可能会发现状态栏的样式会发生改变或者消失。这在某些情况下可能会影响用户体验，因此我们需要找到一种方法来恢复状态栏的样式。

一种常用的方法是在UIImagePickerController的present方法之前，将状态栏的样式保存下来，并在UIImagePickerController被dismiss之后再恢复。下面是一个示例代码：

Swift
class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    var previousStatusBarStyle: UIStatusBarStyle?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
    
    @IBAction func showImagePicker(_ sender: Any) {
        let imagePickerController = UIImagePickerController()
        imagePickerController.delegate = self
        imagePickerController.sourceType = .photoLibrary
        
        // 保存之前的状态栏样式
        previousStatusBarStyle = UIApplication.shared.statusBarStyle
        
        // 设置状态栏样式为默认样式
        UIApplication.shared.statusBarStyle = .default
        
        // Present the image picker controller
        present(imagePickerController, animated: true, completion: nil)
    }
    
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        // 恢复之前的状态栏样式
        UIApplication.shared.statusBarStyle = previousStatusBarStyle
        
        // Dismiss the image picker controller
        dismiss(animated: true, completion: nil)
    }
}

在上面的示例代码中，我们首先定义了一个变量previousStatusBarStyle来保存之前的状态栏样式。然后，在调用present方法之前，我们将状态栏样式设置为默认样式.default，并保存之前的状态栏样式。当用户取消选择图片或完成选择后，我们通过调用dismiss方法来关闭UIImagePickerController，并在imagePickerControllerDidCancel方法中恢复之前的状态栏样式。

这样，我们就成功地恢复了状态栏的样式，并提升了用户体验。

在使用IOS SDK中的UIImagePickerController时，恢复状态栏的样式是一个常见的需求。通过保存之前的状态栏样式，并在UIImagePickerController被dismiss之后恢复，我们可以有效地解决这个问题。以上示例代码提供了一个简单的实现方法，开发者可以根据自己的需求进行适当的修改和扩展。

案例代码

Swift
class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    var previousStatusBarStyle: UIStatusBarStyle?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
    
    @IBAction func showImagePicker(_ sender: Any) {
        let imagePickerController = UIImagePickerController()
        imagePickerController.delegate = self
        imagePickerController.sourceType = .photoLibrary
        
        // 保存之前的状态栏样式
        previousStatusBarStyle = UIApplication.shared.statusBarStyle
        
        // 设置状态栏样式为默认样式
        UIApplication.shared.statusBarStyle = .default
        
        // Present the image picker controller
        present(imagePickerController, animated: true, completion: nil)
    }
    
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        // 恢复之前的状态栏样式
        UIApplication.shared.statusBarStyle = previousStatusBarStyle
        
        // Dismiss the image picker controller
        dismiss(animated: true, completion: nil)
    }
}

参考资料：

- [Apple Developer Documentation - UIImagePickerController](Apple.com/documentation/uikit/uiimagepickercontroller">https://developer.Apple.com/documentation/uikit/uiimagepickercontroller)

- [Stack Overflow - How to restore status bar after UIImagePickerController](https://stackoverflow.com/questions/26070242/how-to-restore-status-bar-after-uiimagepickercontroller)