Question

我已经在互联网上查看了如何使用IOS 8创建本地通知。我发现了许多文章，但没有解释如何确定用户是否已设置“警报”开启或关闭。请有人帮帮我!!!我更愿意使用Objective C over Swift。

Answer 1

您可以使用UIApplication的{{3}}

进行检查

if ([[UIApplication sharedApplication] respondsToSelector:@selector(currentUserNotificationSettings)]){ // Check it's iOS 8 and above
    UIUserNotificationSettings *grantedSettings = [[UIApplication sharedApplication] currentUserNotificationSettings];

    if (grantedSettings.types == UIUserNotificationTypeNone) {
        NSLog(@"No permiossion granted");
    }
    else if (grantedSettings.types & UIUserNotificationTypeSound & UIUserNotificationTypeAlert ){
        NSLog(@"Sound and alert permissions ");
    }
    else if (grantedSettings.types  & UIUserNotificationTypeAlert){
        NSLog(@"Alert Permission Granted");
    }
}

希望这有帮助，如果您需要更多信息，请告诉我

Answer 2

要扩展Albert的答案，您不需要在Swift中使用rawValue。由于UIUserNotificationType符合OptionSetType，因此可以执行以下操作：

if let settings = UIApplication.shared.currentUserNotificationSettings {
    if settings.types.contains([.alert, .sound]) {
        //Have alert and sound permissions
    } else if settings.types.contains(.alert) {
        //Have alert permission
    }
}

使用括号[]语法组合选项类型（类似于按位或|运算符，用于组合其他语言的选项标记）。

Answer 3

快速与guard：

guard let settings = UIApplication.sharedApplication().currentUserNotificationSettings() where settings.types != .None else {
    return
}

Answer 4

这是 Swift 3 中的一个简单函数，用于检查是否启用了至少一种类型的通知。

享受！

static func areNotificationsEnabled() -> Bool {
    guard let settings = UIApplication.shared.currentUserNotificationSettings else {
        return false
    }

    return settings.types.intersection([.alert, .badge, .sound]).isEmpty != true
}

感谢MichałKałużny的灵感。

Answer 5

编辑：看看@ simeon的answer。

在Swift中，您需要使用rawValue：

let grantedSettings = UIApplication.sharedApplication().currentUserNotificationSettings()
if grantedSettings.types.rawValue & UIUserNotificationType.Alert.rawValue != 0 {
    // Alert permission granted
}

Answer 6

使用@simeon答案Xcode告诉我

'currentUserNotificationSettings'在iOS 10.0中已弃用：使用UserNotifications Framework - [UNUserNotificationCenter getNotificationSettingsWithCompletionHandler：]和 - [UNUserNotificationCenter getNotificationCategoriesWithCompletionHandler：]

所以这是使用UNUserNotificationCenter进行 Swift 4 的解决方案：

UNUserNotificationCenter.current().getNotificationSettings(){ (settings) in

        switch settings.alertSetting{
        case .enabled:

            //Permissions are granted

        case .disabled:

            //Permissions are not granted

        case .notSupported:

            //The application does not support this notification type
        }
    }

Answer 7

Objective C + iOS 10

  UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
  [center getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {

        switch (settings.authorizationStatus) {
            case UNAuthorizationStatusNotDetermined:

                break;

            case UNAuthorizationStatusDenied:

                break;

            case UNAuthorizationStatusAuthorized:

                break;

            default:
                break;
        }
    }];

检查IOS 8中是否启用了本地通知

7 个答案: