swift小知识之常用权限检测

最近在Swift项目实践中，用到了系统的一些权限请求，如定位、相机、相册、日历.....，为了更方便的查询各种权限状态以及使用这些功能，我简单的整理了一些常用的系统权限的状态以及授权。

特别说明：在使用这些功能时，需要在info.plist中添加对应的描述，否则将导致项目崩溃，在添加定位权限描述以及相册权限描述时，需要添加以下描述，否则可能会导致包上传到itunesConnect时找不到包，当然，苹果也会在你包上传之后发邮件提醒你

*  Privacy - Photo Library Additions Usage Description
*  Privacy - Photo Library Usage Description
*  Privacy - Location When In Use Usage Description
*  Privacy - Location Always and When In Use Usage Description

1.导入头文件、自定义权限的各种状态，方便各种的权限状态的统一处理

import CoreLocation
import ContactsUI
import PhotosUI
import AssetsLibrary
import EventKitUI
import CoreTelephony
import AVFoundation
//回调处理
typealias BWPrivacyAuthorizerCompletionClosure = (_ granted: Bool)->Void

enum BWPrivacyAuthorizerStatus {
    case notDetermined                  //尚未授权
    case restricted                     //家长控制
    case denied                         //拒绝
    case authorized                     //已授权
}

2.常用权限状态，将各种权限状态转化成统一的自定义的权限状态，方便统一处理

// 1.定位授权状态
 func bw_locationAuthorizationStatus() -> BWPrivacyAuthorizerStatus {
     let status = CLLocationManager.authorizationStatus()
     switch status {
     case .denied:
         return .denied
     case .notDetermined:
         return .notDetermined
     case .restricted:
         return .restricted
     case .authorized:
         return .authorized
     default:
         return .authorized
     }
 }

// 2.通讯录授权状态
func bw_contactAuthorizationStatus() -> BWPrivacyAuthorizerStatus {
    let status = CNContactStore.authorizationStatus(for: .contacts)
    switch status {
    case .notDetermined:
        return .notDetermined
    case .restricted:
        return .restricted
    case .denied:
        return .denied
    case .authorized:
        return .authorized
    default:
        return .authorized
    }
}

// 3.相册授权状态
func bw_photoLibraryAuthorizationStatus() -> BWPrivacyAuthorizerStatus {
    if #available(iOS 9.0, *) {
        let status = PHPhotoLibrary.authorizationStatus()
        switch status {
        case .notDetermined:
            return .notDetermined
        case .restricted:
            return .restricted
        case .denied:
            return .denied
        default:
            return .authorized
        }
    } else {
        let status = ALAssetsLibrary.authorizationStatus()
        switch status {
        case .notDetermined:
            return .notDetermined
        case .restricted:
            return .restricted
        case .denied:
            return .denied
        default:
            return .authorized
        }
    }
}

// 4.相机授权状态
func bw_cameraAuthorizationStatus() -> BWPrivacyAuthorizerStatus {
    let status = AVCaptureDevice.authorizationStatus(for: AVMediaType.video)
    switch status {
    case .notDetermined:
        return .notDetermined
    case .restricted:
        return .restricted
    case .denied:
        return .denied
    case .authorized:
        return .authorized
    default:
        return .authorized
    }
}

// 5.日历授权状态
func bw_calendarAuthorizationStatus() -> BWPrivacyAuthorizerStatus {
    let status = EKEventStore.authorizationStatus(for: EKEntityType.event)
    switch status {
    case .notDetermined:
        return .notDetermined
    case .restricted:
        return .restricted
    case .denied:
        return .denied
    case .authorized:
        return .authorized
    default:
        return .authorized
    }
}

// 6.麦克风权限
func bw_audioAuthorizationStatus() -> BWPrivacyAuthorizerStatus {
    let status = AVAudioSession.sharedInstance().recordPermission
    switch status {
    case .undetermined:
        return .notDetermined
    case .denied:
        return .denied
    case .granted:
        return .authorized
    }
}

3.请求授权

//MARK: 通讯录相关权限
func bw_requestContactAuthorization(with completion: @escaping BWPrivacyAuthorizerCompletionClosure) {
    let status = bw_contactAuthorizationStatus()
    switch status {
    case .notDetermined:
        let store = CNContactStore.init()
        store.requestAccess(for: .contacts) { (granted, error) in
            DispatchQueue.main.async {
                if granted == false {
                    bw_showAlertWithTitle("无法访问通讯录", message: bw_authorizationNotice(title: "通讯录"))
                }
                completion(granted)
            }
        }
    case .restricted,.denied:
        completion(false)
        bw_showAlertWithTitle("无法访问通讯录", message: bw_authorizationNotice(title: "通讯录"))
    case .authorized:
        completion(true)
    }
}

//MARK: 相册相关权限
func bw_requestPhotoLibraryAuthorization(with completion: @escaping BWPrivacyAuthorizerCompletionClosure) {
    let status = bw_photoLibraryAuthorizationStatus()
    switch status {
    case .notDetermined:
        if #available(iOS 9.0, *) {
            PHPhotoLibrary.requestAuthorization { (status) in
                DispatchQueue.main.async {
                    switch status {
                    case .authorized:
                        completion(true)
                    default:
                        completion(false)
                        bw_showAlertWithTitle("无法访问照片", message: bw_authorizationNotice(title: "照片"))
                    }
                }
            }
        }
    case .restricted,.denied:
        bw_showAlertWithTitle("无法访问照片", message: bw_authorizationNotice(title: "照片"))
    case .authorized:
        completion(true)
    }
}

//MARK: 相机相关权限
func bw_requestCameraAuthorization(with completion: @escaping BWPrivacyAuthorizerCompletionClosure) {
    let status = bw_cameraAuthorizationStatus()
    switch status {
    case .notDetermined:
        AVCaptureDevice.requestAccess(for: .video, completionHandler: { (granted: Bool) in
            DispatchQueue.main.async {
                if granted == false {
                    bw_showAlertWithTitle("无法访问相机", message: bw_authorizationNotice(title: "相机"))
                }
                completion(granted)
            }
        })
    case .restricted,.denied:
        bw_showAlertWithTitle("无法访问相机", message: bw_authorizationNotice(title: "相机"))
    case .authorized:
        completion(true)
    }
}

//MARK: 日历相关权限
func bw_requestCalendarAuthorization(with completion: @escaping BWPrivacyAuthorizerCompletionClosure) {
    let status = bw_calendarAuthorizationStatus()
    switch status {
    case .notDetermined:
        let store = EKEventStore.init()
        store.requestAccess(to: .event) {(granted, error) in
            DispatchQueue.main.async {
                if granted == false {
                    bw_showAlertWithTitle("无法访问日历", message: bw_authorizationNotice(title: "日历"))
                }
                completion(granted)
            }
        }
    case .authorized:
        completion(true)
    case .restricted,.denied:
        bw_showAlertWithTitle("无法访问日历", message: bw_authorizationNotice(title: "日历"))
    }
}

//MARK:定位相关权限
func bw_requestLocationAuthorization(with locationManager: CLLocationManager, completion: @escaping BWPrivacyAuthorizerCompletionClosure) {
    let status = bw_locationAuthorizationStatus()
    switch status {
    case .denied,.restricted:
        completion(false)
        bw_showAlertWithTitle("无法开启定位", message: "请在iPhone的\"设置-隐私-位置\"中允许\(BWAppDispalyName)开启位置权限")
    case .notDetermined:
        locationManager.requestWhenInUseAuthorization()
    //            locationManager.startUpdatingLocation()
    case .authorized:
        completion(true)
    }
}

//MARK: 麦克风相关权限
func bw_requestAudioAuthorization(with completion: @escaping BWPrivacyAuthorizerCompletionClosure) {
    let status = bw_audioAuthorizationStatus()
    switch status {
    case .notDetermined:
        AVAudioSession.sharedInstance().requestRecordPermission { (granted) in
            DispatchQueue.main.async {
                if granted == false {
                    bw_showAlertWithTitle("无法访问麦克风", message: bw_authorizationNotice(title: "麦克风"))
                }
                completion(granted)
            }
        }
    case .denied:
        completion(true)
        bw_showAlertWithTitle("无法访问麦克风", message: bw_authorizationNotice(title: "麦克风"))
    case .authorized:
        completion(true)
    default:
        break
    }
}

//MARK: 通知相关权限
func bw_notificationAuthorizationStatus(with completion: @escaping BWPrivacyAuthorizerCompletionClosure) {
    if #available(iOS 10.0, *) {
        UNUserNotificationCenter.current().getNotificationSettings { (settings) in
            switch settings.authorizationStatus {
            case .authorized,.provisional:
                completion(true)
            case .notDetermined:
                completion(false)
            case .denied:
                completion(false)
            @unknown default:
                completion(false)
            }
        }
    } else {
        let isNotificationEnabled = UIApplication.shared.currentUserNotificationSettings?.types.contains(UIUserNotificationType.alert)
        if isNotificationEnabled == true {
            completion(true)
        } else {
            completion(false)
        }
    }
}

//MARK: 弹窗展示
private func bw_authorizationNotice(title: String) -> String {
    return "请在iPhone的\"设置-隐私-\(title)\"中允许\(BWAppDispalyName)访问\(title)"
}
private func bw_showAlertWithTitle(_ title: String, message: String) {
    let alertController = UIAlertController.init(title: title, message: message, preferredStyle: .alert)
    let cancelAction = UIAlertAction.init(title: "取消", style: .cancel, handler: nil)
    let goAction = UIAlertAction.init(title: "前往设置", style: .default) { (action) in
        if let settingUrl = URL(string: UIApplication.openSettingsURLString) {
            if UIApplication.shared.canOpenURL(settingUrl) {
                UIApplication.shared.openURL(settingUrl)
            }
        }
    }
    alertController.addAction(cancelAction)
    alertController.addAction(goAction)
    UIApplication.shared.keyWindow?.rootViewController?.present(alertController, animated: true, completion: nil)
}