Swift 5 – 開啟相機權限 / 開啟相簿權限 / 跳轉設定頁面開啟權限

設置使用者手機相機、相簿權限開啟，為開啟自動跳轉設定頁面
Xcode設置到程式撰寫按表操課保證成功
– PHPhotoLibrary 相簿權限
– AVCaptureDevice 相機權限

Xcode Info 設置

Privacy - Camera Usage Description
Privacy - Photo Library Usage Description

Controller

import Photos

func authorize() -> Bool {
    let photoLibraryStatus = PHPhotoLibrary.authorizationStatus() //相簿請求
    let camStatus = AVCaptureDevice.authorizationStatus(for: AVMediaType.video) //相機請求
    switch (camStatus, photoLibraryStatus){ //判斷狀態
    case (.authorized,.authorized): //兩個都允許
        return true
    case (.notDetermined,.notDetermined): //兩個都還未決定,就請求授權
        AVCaptureDevice.requestAccess(for: AVMediaType.video,  completionHandler: { (status) in
            DispatchQueue.main.async(execute: {
                _ = self.authorize()
            })
        })
        PHPhotoLibrary.requestAuthorization({ (status) in
            DispatchQueue.main.async(execute: {
                _ = self.authorize()
            })
        })
    case (.authorized,.notDetermined): //相機允許，相簿未決定，相簿請求授權
        PHPhotoLibrary.requestAuthorization({ (status) in
            DispatchQueue.main.async(execute: {
                _ = self.authorize()
            })
        })
    case (.authorized,.denied): //相機允許，相簿拒絕，做出提醒
        DispatchQueue.main.async(execute: {
            let alertController = UIAlertController(title: "提醒", message: "您目前拍攝的照片並不會儲存至相簿，要前往設定嗎?", preferredStyle: .alert)
            let canceAlertion = UIAlertAction(title: "取消", style: .cancel, handler: {(status) in})
            let settingAction = UIAlertAction(title: "設定", style: .default, handler: { (action) in
                let url = URL(string: UIApplication.openSettingsURLString)
                if let url = url, UIApplication.shared.canOpenURL(url) {
                    if #available(iOS 10.0, *) {
                        UIApplication.shared.open(url, options: [:], completionHandler: { (success) in
                            print("跳至設定")
                        })
                    } else {
                        UIApplication.shared.openURL(url)
                    }
                }
            })
            alertController.addAction(canceAlertion)
            alertController.addAction(settingAction)
            self.present(alertController, animated: true, completion: nil)
        })
    default: //預設，如都不是以上狀態
        DispatchQueue.main.async(execute: {
            let alertController = UIAlertController(title: "提醒", message: "請點擊允許才可於APP內開啟相機及儲存至相簿", preferredStyle: .alert)
            let canceAlertion = UIAlertAction(title: "取消", style: .cancel, handler: nil)
            let settingAction = UIAlertAction(title: "設定", style: .default, handler: { (action) in
                let url = URL(string: UIApplication.openSettingsURLString)
                if let url = url, UIApplication.shared.canOpenURL(url) {
                    if #available(iOS 10.0, *) {
                        UIApplication.shared.open(url, options: [:], completionHandler: { (success) in
                            print("跳至設定")
                        })
                    } else {
                        UIApplication.shared.openURL(url)
                    }
                }
            })
            alertController.addAction(canceAlertion)
            alertController.addAction(settingAction)
            self.present(alertController, animated: true, completion: nil)
        })
    }
    return false
}

override func viewDidLoad() {
    super.viewDidLoad()
    if authorize(){
        print("開始使用相機相簿")
    }
}

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