我编写了一个扩展程序，其中考虑了所有可能的情况：
- 如果允许访问，则代码
onAccessHasBeenGranted将运行。
- 如果未确定访问权限，
requestAuthorization(_:)则将被调用。
- 如果用户拒绝了您对应用程序照片库的访问，则将向用户显示一个窗口，该窗口提供设置并允许访问。在此窗口中，“取消”和“设置”按钮将对他可用。当他按下“设置”按钮时，您的应用程序设置将打开。
用法示例：
PHPhotoLibrary.execute(controller: self, onAccessHasBeenGranted: {
})
扩展代码：
import Photos
import UIKit
public extension PHPhotoLibrary {
static func execute(controller: UIViewController,
onAccessHasBeenGranted: @escaping () -> Void,
onAccessHasBeenDenied: (() -> Void)? = nil) {
let onDeniedOrRestricted = onAccessHasBeenDenied ?? {
let alert = UIAlertController(
title: "We were unable to load your album groups. Sorry!",
message: "You can enable access in Privacy Settings",
preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
alert.addAction(UIAlertAction(title: "Settings", style: .default, handler: { _ in
if let settingsURL = URL(string: UIApplication.openSettingsURLString) {
UIApplication.shared.open(settingsURL)
}
}))
controller.present(alert, animated: true)
}
let status = PHPhotoLibrary.authorizationStatus()
switch status {
case .notDetermined:
onNotDetermined(onDeniedOrRestricted, onAccessHasBeenGranted)
case .denied, .restricted:
onDeniedOrRestricted()
case .authorized:
onAccessHasBeenGranted()
@unknown default:
fatalError("PHPhotoLibrary::execute - \"Unknown case\"")
}
}
}
private func onNotDetermined(_ onDeniedOrRestricted: @escaping (()->Void), _ onAuthorized: @escaping (()->Void)) {
PHPhotoLibrary.requestAuthorization({ status in
switch status {
case .notDetermined:
onNotDetermined(onDeniedOrRestricted, onAuthorized)
case .denied, .restricted:
onDeniedOrRestricted()
case .authorized:
onAuthorized()
@unknown default:
fatalError("PHPhotoLibrary::execute - \"Unknown case\"")
}
})
}
