iPhone本地通知不会出现[重复]

Posted 2023-02-24

【中文标题】iPhone本地通知不会出现[重复]

【英文标题】：iPhone Local Notifications Won't Appear [duplicate]

【发布时间】：2012-01-22 04:17:43

【问题描述】：

可能重复：UILocalNotification isn't working at all

我正在编写一个应用程序，当活动日期临近时，它会通过通知中心向用户发送警报。但是当我在日期选择器中设置日期并关闭应用程序时，通知不会出现。我已经在我的配置文件中启用了推送通知。这是我项目中处理通知中心的所有代码，这是我的视图控制器文件中处理日期选择器的所有代码：

- (IBAction)dateChanged:(id)sender

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    NSDate *selectedDate = [self.datePicker date];

    [defaults setObject:selectedDate forKey:@"ImportantDatesViewController.selectedDate"];
    [defaults synchronize];



- (void)viewDidLoad 
    NSDate *storedDate = [[NSUserDefaults standardUserDefaults] 
                          objectForKey:@"ImportantDatesViewController.selectedDate"];
    if (storedDate == nil) 
        storedDate = [NSDate date];
    

    [self.datePicker setDate:storedDate animated:NO];

这就是我的 App 委托中处理本地通知的所有内容：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

....

[[UIApplication sharedApplication] registerForRemoteNotificationTypes:
     UIRemoteNotificationTypeBadge |
     UIRemoteNotificationTypeAlert |
     UIRemoteNotificationTypeSound];

    UILocalNotification *localNotif = [[UILocalNotification alloc] init];

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"mm'/'dd'/'yyyy"];

    NSDate *eventDate = [[NSUserDefaults standardUserDefaults] objectForKey:@"ImportantDatesViewController.selectedDate"];



    localNotif.fireDate = [eventDate dateByAddingTimeInterval:-13*60*60];
    localNotif.timeZone = [NSTimeZone defaultTimeZone];


    localNotif.alertBody = @"Event in three days!";

    localNotif.alertAction = nil;

    localNotif.soundName = UILocalNotificationDefaultSoundName;
    localNotif.applicationIconBadgeNumber = 0;
    [[UIApplication sharedApplication] scheduleLocalNotification:localNotif];    

    return YES;  



- (void)application:(UIApplication*)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData*)deviceToken

    NSString* pushToken = [[[[deviceToken description] 
                             stringByReplacingOccurrencesOfString:@"<"withString:@""] 
                            stringByReplacingOccurrencesOfString:@">" withString:@""] 
                           stringByReplacingOccurrencesOfString: @" " withString: @""];

    NSLog(@"%@", pushToken);



- (void)application:(UIApplication*)application didFailToRegisterForRemoteNotificationsWithError:(NSError*)error 

    NSLog(@"error: %@", error);

非常感谢任何帮助，谢谢！

【问题讨论】：

当我说我在从NSUserDefaults 检索时使用键中的笔尖名称时，恐怕我可能对另一个问题感到困惑。这是个人喜好的问题，以确保密钥是唯一的。事情的真相是你应该使用你用来存储它的任何东西来检索它。找到您存储eventDate 的位置并使用相同的密钥。

非常感谢马克。我正在尝试确定将 eventDate 存储在哪里，但是在查找它时遇到了一些问题。它可能在我笔尖的选择器中吗？

您在哪个视图控制器中向用户询问您要触发本地通知的日期？在那个班级的某个地方，您将日期存储到NSUserDefaults。使用相同的密钥。现在你明白为什么我提到将键存储为常量了。 :)

见***.com/a/4974553

哦，好的，非常感谢。那么，只有在应用程序根本没有运行时才会出现警报，即使在后台也是如此？抱歉这个愚蠢的问题，我对此还是很陌生。

【参考方案1】：

以下代码用于本地通知。

-(IBAction)buttonPressed:(UIButton *)button

    UILocalNotification *localNotification = [[UILocalNotification alloc] init];

    if (!localNotification)
        return;

    // Current date
    NSDate *date = [NSDate date]; 

    // Add one minute to the current time
    NSDate *dateToFire = [date dateByAddingTimeInterval:20];

    // Set the fire date/time
    [localNotification setFireDate:dateToFire];
    [localNotification setTimeZone:[NSTimeZone defaultTimeZone]];

    // Create a payload to go along with the notification
    NSArray *array = [NSArray arrayWithObjects:@"Value 1", @"Value 2", nil];
    NSDictionary *data = [NSDictionary dictionaryWithObject:array forKey:@"payload"];
    [localNotification setUserInfo:data];

    if (button == buttonAlert || button == buttonAll)
    
        // Setup alert notification
        [localNotification setAlertBody:@"Incoming Local Notification" ];
        [localNotification setAlertAction:@"Open App"];
        [localNotification setHasAction:YES];
    

    if (button == buttonBadge || button == buttonAll)
    
        // Set badge notification, increment current badge value
        [localNotification setApplicationIconBadgeNumber:[[UIApplication sharedApplication] applicationIconBadgeNumber] + 1];
    

    if (button == buttonSound || button == buttonAll)
    
        // Setup sound notification
        [localNotification setSoundName:UILocalNotificationDefaultSoundName];
    

    // Schedule the notification
    [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];