我正在制作一个需要本地通知的 iPhone 应用。
在本地通知中有 repeatInterval 属性，我们可以将单位重复间隔设置为分钟、小时、天、周、年等。
我希望重复间隔应该是 4 小时。
所以每 4 小时本地通知来一次。
我不希望用户为每个设置单独的通知。
我希望用户能够将 repeatInterval 设置为 4 小时。
我该怎么做？
【问题讨论】：
标签： iphone cocoa-touch ios4 uilocalnotification localnotification
得到了答案，它是直截了当的。
您无法创建自定义重复间隔。
您必须使用 NSCalendarUnit 的内置单位时间间隔。
我尝试了上述所有解决方案，甚至尝试了其他方法，但都没有奏效。
我已经投入了大量时间来发现我们无法让它在自定义时间间隔内工作。
【讨论】：
//This is how I set local notification based on time interval repeatedly and executed method customized snooze and delete
let content = UNMutableNotificationContent()
content.title = "Time Based Local Notification"
content.subtitle = "Its is a demo"
content.sound = .default
content.categoryIdentifier = "UYLReminderCategory"
//repition of time base local notification in foreground, background, killed
let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 60, repeats: true)
let request = UNNotificationRequest(identifier: "IOS Demo", content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)
let snoozeAction = UNNotificationAction(identifier: "Snooze", title: "Snooze", options: [])
let deleteAction = UNNotificationAction(identifier: "UYLDeleteAction", title: "Delete", options: [.destructive])
let cat = UNNotificationCategory(identifier: "UYLReminderCategory", actions: [snoozeAction,deleteAction], intentIdentifiers: [], options: [])
UNUserNotificationCenter.current().setNotificationCategories([cat])
【讨论】：
我有一个想法如何做到这一点，我已经在我的项目中实现了这一点
首先，创建带有触发日期的本地通知（例如，每分钟）。 下一步 - 使用此通知的唯一 ID 填充用户信息（如果您想在将来删除它）和您的自定义时间段，如下所示：
-(void) createLocalRepeatedNotificationWithId: (NSString*) Id
{
UILocalNotification *localNotification = [[UILocalNotification alloc] init];
NSTimeInterval your_custom_fire_interval = 60; // interval in seconds
NSDate *remindDate = [[NSDate date] dateByAddingTimeInterval:your_custom_fire_interval];
localNotification.fireDate = remindDate;
localNotification.userInfo = @{@"uid":Id, @"period": [NSNumber numberWithInteger:your_custom_fire_interval]};
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
}
之后，在你的 AppDelegate 中实现-(void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification：
只需再次将其添加到隐藏的通知中！
NSInteger period = [[notification.userInfo objectForKey:@"period"] integerValue]; //1
NSTimeInterval t= 10 * period;
notification.fireDate =[[NSDate date] dateByAddingTimeInterval:t]; //2
[[UIApplication sharedApplication] scheduleLocalNotification:notification]; //3
如果您想删除此通知，请执行
UIApplication *app = [UIApplication sharedApplication];
NSArray *eventArray = [app scheduledLocalNotifications];
for (int i=0; i<[eventArray count]; i++)
{
UILocalNotification* oneEvent = [eventArray objectAtIndex:i];
NSDictionary *userInfoCurrent = oneEvent.userInfo;
NSString *uid=[NSString stringWithFormat:@"%@",[userInfoCurrent valueForKey:@"id"]];
if ([uid isEqualToString:notification_id_to_remove])
{
//Cancelling local notification
[app cancelLocalNotification:oneEvent];
break;
}
}
非常重要！
-(void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification 在后台时不要调用。因此，您必须设置长时间运行的后台任务，您将在其中再次创建通知。
【讨论】：
如果您为每次想要触发通知的时间设置单独的通知，您可以设置任何所需的时间间隔。然后您必须管理它们，如果您不是当前允许在后台运行的应用程序，则必须通过让用户运行您的应用程序来刷新它们。完成此操作后，我可以告诉您这是一个主要的 PITA。
【讨论】：
-(void)schedulenotificationfortimeinterval:(NSString *)id1
{
NSLog(@"selected value %d",selectedvalue);
NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"MMM dd,yyyy hh:mm a"];
UILocalNotification *localNotification2 = [[UILocalNotification alloc] init];
// localNotification2. fireDate = [[formatter dateFromString:[NSString stringWithFormat:@"%@ %@",[MedicationDict valueForKey:@"Starting"],[MedicationDict valueForKey:@"Ending"]]] dateByAddingTimeInterval:0];
if(selectedvalue==0)
{
NSLog(@"dk 0000");
localNotification2.fireDate = [formatter dateFromString:[NSString stringWithFormat:@"%@ %@",[MedicationDict valueForKey:@"Starting"],[MedicationDict valueForKey:@"Ending"]]] ;//now
localNotification2.applicationIconBadgeNumber = 1;
localNotification2.repeatInterval=NSDayCalendarUnit;
}
if(selectedvalue==1)
{
NSLog(@"dk 1111");
for( int u = 0; u <= 2 ;u++)
{
localNotification2.fireDate = [[formatter dateFromString:[NSString stringWithFormat:@"%@ %@",[MedicationDict valueForKey:@"Starting"],[MedicationDict valueForKey:@"Ending"]]] dateByAddingTimeInterval:43200.0*u] ;// 12 hr
localNotification2.repeatInterval=NSDayCalendarUnit;
localNotification2.alertBody = [NSString stringWithFormat:@"Friendly reminder to take %@ %@ at %@.",[MedicationDict objectForKey:@"DrugName"],[MedicationDict objectForKey:@"Frequency"],[MedicationDict objectForKey:@"Ending"]];
localNotification2.alertAction = @"Notification";
localNotification2.soundName=UILocalNotificationDefaultSoundName;
localNotification2.applicationIconBadgeNumber = 2;
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification2];
NSLog(@"all notifications %@",[[UIApplication sharedApplication]scheduledLocalNotifications]);
}
// localNotification2.repeatInterval=NSDayCalendarUnit;
}
if(selectedvalue==2)
{
NSLog(@"dk 22222");
for( int u = 0; u <= 3 ;u++)
{
localNotification2.fireDate = [[formatter dateFromString:[NSString stringWithFormat:@"%@ %@",[MedicationDict valueForKey:@"Starting"],[MedicationDict valueForKey:@"Ending"]]] dateByAddingTimeInterval:28800.0*u] ;//8 hr
localNotification2.repeatInterval=NSDayCalendarUnit;
localNotification2.alertBody = [NSString stringWithFormat:@"Friendly reminder to take %@ %@ at %@.",[MedicationDict objectForKey:@"DrugName"],[MedicationDict objectForKey:@"Frequency"],[MedicationDict objectForKey:@"Ending"]];
localNotification2.alertAction = @"Notification";
localNotification2.soundName=UILocalNotificationDefaultSoundName;
localNotification2.applicationIconBadgeNumber = 3;
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification2];
NSLog(@"all notifications %@",[[UIApplication sharedApplication]scheduledLocalNotifications]);
}
// localNotification2.repeatInterval=NSDayCalendarUnit;
}
if(selectedvalue==3)
{
NSLog(@"dk 3333");
for( int u = 0; u <= 4 ;u++)
{
localNotification2.fireDate = [[formatter dateFromString:[NSString stringWithFormat:@"%@ %@",[MedicationDict valueForKey:@"Starting"],[MedicationDict valueForKey:@"Ending"]]] dateByAddingTimeInterval:21600.0*u] ;//6 hr
localNotification2.repeatInterval=NSDayCalendarUnit;
localNotification2.alertBody = [NSString stringWithFormat:@"Friendly reminder to take %@ %@ at %@.",[MedicationDict objectForKey:@"DrugName"],[MedicationDict objectForKey:@"Frequency"],[MedicationDict objectForKey:@"Ending"]];
localNotification2.alertAction = @"Notification";
localNotification2.soundName=UILocalNotificationDefaultSoundName;
localNotification2.applicationIconBadgeNumber = 4;
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification2];
NSLog(@"all notifications %@",[[UIApplication sharedApplication]scheduledLocalNotifications]);
}
// localNotification2.repeatInterval=NSDayCalendarUnit;
}
// localNotification2.repeatInterval=NSDayCalendarUnit;
NSLog(@"date is %@ %@",[MedicationDict valueForKey:@"Starting"],[MedicationDict valueForKey:@"Ending"]);
localNotification2.timeZone = [NSTimeZone localTimeZone];
localNotification2.alertBody = [NSString stringWithFormat:@"Friendly reminder to take %@ %@ at %@.",[MedicationDict objectForKey:@"DrugName"],[MedicationDict objectForKey:@"Frequency"],[MedicationDict objectForKey:@"Ending"]];
localNotification2.alertAction = @"Notification";
localNotification2.soundName=UILocalNotificationDefaultSoundName;
//localNotification2.applicationIconBadgeNumber = 1;
// infoDict = [NSDictionary dictionaryWithObject:id1 forKey:@"did"];
// localNotification2.userInfo = infoDict;
// [[UIApplication sharedApplication] scheduleLocalNotification:localNotification2];
// NSLog(@"all notifications %@",[[UIApplication sharedApplication]scheduledLocalNotifications]);
// [[UIApplication sharedApplication] cancelAllLocalNotifications];//dk
}
【讨论】：
重复间隔只是一个具有位图常量的枚举，因此无法自定义repeatIntervals，只是每分钟、每秒、每周等。
话虽如此，您的用户没有理由必须设置每一个。如果您让他们在您的用户界面中设置两个值，例如“Frequency unit: Yearly/Monthly/Weekly/Hourly”和“Every ____ years/months/weeks/hours”，那么您可以通过设置适当的触发日期自动生成适当的通知，而无需重复。
UILocalNotification *locNot = [[UILocalNotification alloc] init];
NSDate *now = [NSDate date];
NSInterval interval;
switch( freqFlag ) { // Where freqFlag is NSHourCalendarUnit for example
case NSHourCalendarUnit:
interval = 60 * 60; // One hour in seconds
break;
case NSDayCalendarUnit:
interval = 24 * 60 * 60; // One day in seconds
break;
}
if( every == 1 ) {
locNot.fireDate = [NSDate dateWithTimeInterval: interval fromDate: now];
locNot.repeatInterval = freqFlag;
[[UIApplication sharedApplication] scheduleLocalNotification: locNot];
} else {
for( int i = 1; i <= repeatCountDesired; ++i ) {
locNot.fireDate = [NSDate dateWithTimeInterval: interval*i fromDate: now];
[[UIApplication sharedApplication] scheduleLocalNotification: locNot];
}
}
[locNot release];
【讨论】：
我已经使用了这个代码，它可以很好地重复 LocalNotification 我已经使用 LavaSlider 代码来实现这个代码
UILocalNotification * localNotifEndCycle = [[UILocalNotification alloc] init];
localNotifEndCycle.alertBody = @"Your Expected Date ";
NSDate *now = [NSDate date];
for( int i = 1; i <= 10;i++)
{
localNotifEndCycle.alertBody = @"Your Expected Date ";
localNotifEndCycle.soundName=@"best_guitar_tone.mp3";
localNotifEndCycle.fireDate = [NSDate dateWithTimeInterval:180*i sinceDate:now];
[[UIApplication sharedApplication] scheduleLocalNotification: localNotifEndCycle];
}
}
【讨论】：
notif.repeatInterval = NSDayCalendarUnit;
【讨论】：