Question

我有以下代码，我用它来决定用户是否已授予本地通知权限：

UIUserNotificationSettings *grantedSettings = [[UIApplication sharedApplication] currentUserNotificationSettings];
if (grantedSettings.types == UIUserNotificationTypeNone) {
        NSLog(@"No permission granted");
        //IF AND ONLY IF alerts are wanted by raymio user! FIX
        UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Notice"
                                                                       message:@"You need to enable notifications to be able to receive sun alerts!"
                                                                preferredStyle:UIAlertControllerStyleAlert];

        UIAlertAction* OKAction = [UIAlertAction actionWithTitle:@"Go to Settings now" style:UIAlertActionStyleDefault
                                                         handler:^(UIAlertAction * action) {
                                                NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
                                                [[UIApplication sharedApplication] openURL:url];
                                                         }];

        [alert addAction:OKAction];
        UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault
                                                         handler:^(UIAlertAction * action) {}];

        [alert addAction:cancelAction];
        [self.window addSubview:self.window.rootViewController.view];
        [self.window makeKeyAndVisible];
        [self.window.rootViewController presentViewController:alert animated:YES completion:nil];
    }
    else if (grantedSettings.types & UIUserNotificationTypeSound & UIUserNotificationTypeAlert ){
        NSLog(@"Sound and alert permissions ");
    }
    else if (grantedSettings.types  & UIUserNotificationTypeAlert){
        NSLog(@"Alert Permission Granted");

基本上，它只是不起作用。当应用程序设置中的允许通知开关明确设置为关闭时，我获得“警告权限授予”。如果我将其切换为开启，则设置也不会改变。以下是grantSettings的控制台输出。它保持不变。我还有其他事情发生了。现在我只想删除代码。我必须首先执行此操作，以防用户在初始提示时意外按下取消（并在应用程序中请求警报）。

granted settings: <UIUserNotificationSettings: 0x17042e940; types: (UIUserNotificationTypeAlert UIUserNotificationTypeBadge UIUserNotificationTypeSound);>

这个有缺陷的区域有什么见解？顺便说一下，我正在运行8.1。对ios9的需求并不完全相同，因为ios9会让用户多次提示通知权限。

Answer 1

我在我的一个项目中使用了以下方法来确定用户是否已经授予权限，或者他/她是否实际关闭了设置中的通知。将此方法放在Appdelegate中并检查

A                | B                     | .. n
------------------------------------------
uR96BDuI8YR7gqbc | lTvW5TcIVIVNmE4_LYQ4eA
NA               | 2DT4Lxjyt3F1ZJt8Mt0o4Q
NA               | NA
..               | NA
NA               | NA

然后你可以用条件进行简单的检查

  example <- structure(
  list(
    A = structure(
      list(coln = "A", id = "uR96BDuI8YR7gqbc-Ncg9A"), .Names = c("ALPHA",
        "ID")
    ), 
    B = structure(
      list(
        coln = "B",
        id = c("lTvW5TcIVIVNmE4_LYQ4eA", "2DT4Lxjyt3F1ZJt8Mt0o4Q")
      ), .Names = c("BETA", "ID")
    ), 
    C = structure(
      list(cuisine = "C", id = character(0)), .Names = c("CETA",
        "ID")
    ), 
    D = structure(
      list(cuisine = "D",
        id = character(0)), .Names = c("ALPHA", "ID")
    ), 
    E = structure(
      list(cuisine = "E", id = "O1NBNVfXWmk3CvszAhOEoQ"), .Names = c("ALPHA",
        "ID")
    ), 
    F = structure(
      list(cuisine = "F",
        id = character(0)), .Names = c("ALPHA", "ID")
    )
  ), .Names = c(
    "A", "B", "C", "D",
    "E", "F"
  )
)

我希望这可以帮助你。

Answer 2

在iOS 9中，要检查应用程序当前是否已注册远程通知，请使用：

BOOL isEnabled = [[UIApplication sharedApplication] isRegisteredForRemoteNotifications];

UIUserNotificationSettings无法正常工作？

2 个答案: