如何判断收到了哪个本地通知？目标 - C答案

【问题标题】：How to tell which local notification has been received? Objective - C如何判断收到了哪个本地通知？目标 - C
【发布时间】：2012-08-03 10:33:46
【问题描述】：

我有这段代码根据收到的本地通知调用不同的 NSLog 语句：

- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification{
    if (notification == automaticBackupNotification)
    {
        NSLog(@"Backup notification received.");
    }
    else
    {
        NSLog(@"Did receive notification: %@, set for date:%@ .", notification.alertBody, notification.fireDate);
    }
}

我使用这种方法将通知安排在另一个类中：

- (IBAction)automaticValueChanged {
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    if (automaticSwitch.isOn){
        [defaults setValue:@"1" forKey:@"automatic"];
        //schedule notification
        //Set up the local notification
        appDelegate.automaticBackupNotification = [[UILocalNotification alloc] init];
        if(appDelegate.automaticBackupNotification){
            //Repeat the notification according to frequency
            if ([backupFrequencyLabel.text isEqualToString:@"Daily"]) {
                appDelegate.automaticBackupNotification.repeatInterval = NSDayCalendarUnit;
            }
            if ([backupFrequencyLabel.text isEqualToString:@"Weekly"]) {
                appDelegate.automaticBackupNotification.repeatInterval = NSWeekCalendarUnit;
            }
            else {
                appDelegate.automaticBackupNotification.repeatInterval = NSMonthCalendarUnit;
            }

            //Set fire date to alert time
            NSCalendar *calendar = appDelegate.automaticBackupNotification.repeatCalendar;
            if (!calendar) {
                calendar = [NSCalendar currentCalendar];
            }

            NSDateComponents *components = [[NSDateComponents alloc] init];
            components.day = 1;
            //NSDate *nextFireDate = [calendar dateByAddingComponents:components toDate:[NSDate date] options:0];
            //appDelegate.automaticBackupNotification.fireDate = nextFireDate;
            appDelegate.automaticBackupNotification.fireDate = [NSDate dateWithTimeIntervalSinceNow:20.0];

            //Set time zone to default
            appDelegate.automaticBackupNotification.timeZone = [NSTimeZone defaultTimeZone];

            // schedule notification
            UIApplication *app = [UIApplication sharedApplication];
            [app scheduleLocalNotification:appDelegate.automaticBackupNotification];

            NSLog(@"Backup Fire Date: %@", appDelegate.automaticBackupNotification.fireDate);
        }
    }
    else {
        [defaults setValue:@"0" forKey:@"automatic"];
        if(appDelegate.automaticBackupNotification){
            [[UIApplication sharedApplication] cancelLocalNotification:appDelegate.automaticBackupNotification];
        }
    }

    [defaults synchronize];
}

但是，当应用程序委托收到通知时，它会触发条件的“else”部分。有什么方法可以区分不同的通知吗？还是我做错了什么？

干杯，

泰辛

【问题讨论】：

标签： iphone objective-c ios uilocalnotification

【解决方案1】：

NSNotification 对象有一个属性，叫做 userInfo。它是一个 NSDictionary，您可以在创建通知的位置设置一些值并在收到通知的位置检查它们。

【讨论】：

【解决方案2】：

只需尝试设置UILocalNotification 的userInfo 属性，就像这样，

NSDictionary *userDict = [NSDictionary dictionaryWithObject:@"YOUROBJECT" forKey:@"TESTKEY"];
YOURNOTIFICATION.userInfo = userDict;

当 UILocalNotification 触发时，此方法将被调用，

- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
{
     NSDictionary *dict = [notification userInfo];
     id obj = [dict objectForKey:@"TESTKEY"];
}

根据您在设置UILocalNotification时设置的userInfo，您可以找出调用了哪个notification。

【讨论】：

【解决方案3】：

我个人使用通知名称来知道哪个通知推送或已收到

//add local observer
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(mathodCalled:) name:[NSSTring StringWithFormat :@"plop"] object:nil];

...

//push an event manually 
[[NSNotificationCenter defaultCenter] postNotificationName:eventName object:[NSSTring StringWithFormat :@"plop"]];

...

- (void)methodCalled :(NSNotification*)aNotification{
    if([aNotification.name isEqualToString:@"plop"]){
        // do something
    }

}

【讨论】：