在发出本地通知时询问用户是否允许显示警报

Question

我希望在本地通知被触发时显示警告，但为此我必须请求许可，正如我在iPhone上运行应用程序时所说的那样：

  

尝试安排本地通知{开火日期= 2014年6月13日星期五12小时10分27秒中欧夏令时，时区=（null），重复间隔= 0，重复计数= UILocalNotificationInfiniteRepeatCount，下次开火日期=星期五2014年6月13日12小时10分27秒中欧夏令时，用户信息=（null）}带有提醒但尚未收到用户显示提醒的权限

我该怎么做？ 这是现在的代码：

    UILocalNotification *localNotif = [[UILocalNotification alloc] init];
    localNotif.fireDate = [[NSDate date] dateByAddingTimeInterval:timeUntilNotification];
    localNotif.soundName = UILocalNotificationDefaultSoundName;
    localNotif.alertBody = @"ZEIT!";
    localNotif.alertAction = @"Show me the Timer!";
    localNotif.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] +1;


    [[UIApplication sharedApplication] scheduleLocalNotification:localNotif];

Answer 1

添加此代码后，它会显示一个警告视图，询问用户是否允许。

if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)]) {
    [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeSound|UIUserNotificationTypeBadge
                                                                                                          categories:nil]];
}

您可以在应用程序中添加此代码：didFinishLaunchingWithOptions;方法，以便应用程序在启动应用程序时询问您的用户，或者您可以在设置本地通知时添加此代码，这取决于您。

Answer 2

苏健豪的回答很好。

在Swift中它看起来像这样：

let registerUserNotificationSettings = UIApplication.instancesRespondToSelector("registerUserNotificationSettings:")

if registerUserNotificationSettings { 
    var types: UIUserNotificationType = UIUserNotificationType.Alert | UIUserNotificationType.Sound     
    UIApplication.sharedApplication().registerUserNotificationSettings(UIUserNotific‌​ationSettings(forTypes: types, categories: nil))
} 

另见：Ask for User Permission to Receive UILocalNotifications in iOS 8

Answer 3

//register notifications
if([application respondsToSelector:@selector(registerUserNotificationSettings:)]) //ios 8+
{
    [application registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound categories:nil]];
    [application registerForRemoteNotifications];
}
else // ios 7 or less
{
    [application registerForRemoteNotificationTypes:UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeBadge];
}

Answer 4

用迅捷的语言......

var type = UIUserNotificationType.Badge | UIUserNotificationType.Alert | UIUserNotificationType.Sound;
var setting = UIUserNotificationSettings(forTypes: type, categories: nil);
UIApplication.sharedApplication().registerUserNotificationSettings(setting);
UIApplication.sharedApplication().registerForRemoteNotifications();

Answer 5

尝试使用Objective-C

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
        // Override point for customization after application launch.
        NSLog(@"didFinishLaunchingWithOptions");

        if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)]) {
            [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeSound categories:nil]];
        }

        return YES; 
    }