如何安排在特定时间过后以某种频率重复的通知

Question

我没有看到对调度此类通知的支持，即仅在特定时间过去时才重复。问题是计划立即触发，而无需等待确切的时间，尽管正确重复。

例如，这是在 10 分钟后安排重复通知的代码。这不会等待 10 分钟 - 从现在开始的下一分钟立即开火。

NSDate *theDate = [NSDate dateWithTimeIntervalSinceNow:60*10];
NSDateComponents *dateForSchedule = [[[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian] components:NSCalendarUnitMinute|NSCalendarUnitHour|NSCalendarUnitDay|NSCalendarUnitWeekday|NSCalendarUnitMonth|NSCalendarUnitYear fromDate:theDate];
UNMutableNotificationContent* content = [[UNMutableNotificationContent alloc] init];
content.body = "Your notification is here.";
content.sound = [UNNotificationSound defaultSound];
content.categoryIdentifier = CALL_NOTIFICATION_CATEGORY;
NSDateComponents* date = [[NSDateComponents alloc] init];
if ([self.selectedFrequecy isEqualToString:HOURLY]) {
date.minute = dateForSchedule.minute;
} else if ([self.selectedFrequecy isEqualToString:DAILY]) {
date.hour = dateForSchedule.hour;
date.minute = dateForSchedule.minute;
} else if ([self.selectedFrequecy isEqualToString:WEEKLY]) {
date.weekday = dateForSchedule.weekday;
date.hour = dateForSchedule.hour;
date.minute = dateForSchedule.minute
} else if ([self.selectedFrequecy isEqualToString:MONTHLY]) {
date.day = dateForSchedule.day;
date.hour = dateForSchedule.hour;
date.minute = dateForSchedule.minute;
} else if ([self.selectedFrequecy isEqualToString:YEARLY] || [self.selectedFrequecy isEqualToString:ONCE]) {
date.month = dateForSchedule.month;
date.day = dateForSchedule.day;
date.hour = dateForSchedule.hour;
date.minute = dateForSchedule.minute;
}
UNCalendarNotificationTrigger* trigger;
if ([_selectedFrequecy isEqualToString:ONCE]) {
trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:date repeats:NO];
} else {
trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:date repeats:YES];
}
// Create the request object.
UNNotificationRequest* request = [UNNotificationRequest requestWithIdentifier:self.callSchedule.id content:content trigger:trigger];
[center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error)
{
if (error != nil) {
NSLog(@"%@", error.localizedDescription)
}
}];

这是重复通知的另一个代码块，该通知将在 3 天后每天触发。

NSDate *theDate = [NSDate dateWithTimeIntervalSinceNow:60*60*24*3];
NSDateComponents *dateForSchedule = [[[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian] components:NSCalendarUnitMinute|NSCalendarUnitHour|NSCalendarUnitDay|NSCalendarUnitWeekday|NSCalendarUnitMonth|NSCalendarUnitYear fromDate:theDate];
UNMutableNotificationContent* content = [[UNMutableNotificationContent alloc] init];
content.body = "Your notification is here.";
content.sound = [UNNotificationSound defaultSound];
content.categoryIdentifier = CALL_NOTIFICATION_CATEGORY;
NSDateComponents* date = [[NSDateComponents alloc] init];
if ([self.selectedFrequecy isEqualToString:HOURLY]) {
date.minute = dateForSchedule.minute;
} else if ([self.selectedFrequecy isEqualToString:DAILY]) {
date.hour = dateForSchedule.hour;
date.minute = dateForSchedule.minute;
} else if ([self.selectedFrequecy isEqualToString:WEEKLY]) {
date.weekday = dateForSchedule.weekday;
date.hour = dateForSchedule.hour;
date.minute = dateForSchedule.minute
} else if ([self.selectedFrequecy isEqualToString:MONTHLY]) {
date.day = dateForSchedule.day;
date.hour = dateForSchedule.hour;
date.minute = dateForSchedule.minute;
} else if ([self.selectedFrequecy isEqualToString:YEARLY] || [self.selectedFrequecy isEqualToString:ONCE]) {
date.month = dateForSchedule.month;
date.day = dateForSchedule.day;
date.hour = dateForSchedule.hour;
date.minute = dateForSchedule.minute;
}
UNCalendarNotificationTrigger* trigger;
if ([_selectedFrequecy isEqualToString:ONCE]) {
trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:date repeats:NO];
} else {
trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:date repeats:YES];
}
// Create the request object.
UNNotificationRequest* request = [UNNotificationRequest requestWithIdentifier:self.callSchedule.id content:content trigger:trigger];
[center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error)
{
if (error != nil) {
NSLog(@"%@", error.localizedDescription)
}
}];

这也不会等到 3 天，而是在第二天立即触发。

两者的主要问题是它忽略了它应该等待开始触发通知的时间。如果有人理解了这个问题，你会花一些时间来弄清楚出了什么问题，或者是否有可能。我会非常感激。

Answer 1

在AppDelegate获取权限didfinishlauchingwithoption

if( SYSTEM_VERSION_LESS_THAN( @"10.0" ) )
{
[[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeSound |    UIUserNotificationTypeAlert | UIUserNotificationTypeBadge) categories:nil]];
[[UIApplication sharedApplication] registerForRemoteNotifications];
}
else
{
UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
[center requestAuthorizationWithOptions:(UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionBadge) completionHandler:^(BOOL granted, NSError * _Nullable error)
{
if( !error )
{
[[UIApplication sharedApplication] registerForRemoteNotifications];  // required to get the app to do anything at all about push notifications
NSLog( @"Push registration success." );
}
else
{
NSLog( @"Push registration FAILED" );
NSLog( @"ERROR: %@ - %@", error.localizedFailureReason, error.localizedDescription );
NSLog( @"SUGGESTIONS: %@ - %@", error.localizedRecoveryOptions, error.localizedRecoverySuggestion );  
}  
}];  
}

在ViewController- 在此处实现委托 -

-(void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
NSDate *theDate = [NSDate dateWithTimeIntervalSinceNow:60*1];
NSDateComponents *dateForSchedule = [[[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian] components:NSCalendarUnitMinute|NSCalendarUnitHour|NSCalendarUnitDay|NSCalendarUnitWeekday|NSCalendarUnitMonth|NSCalendarUnitYear fromDate:theDate];
UNMutableNotificationContent* content = [[UNMutableNotificationContent alloc] init];
content.body = @"Your notification is here.";
content.sound = [UNNotificationSound defaultSound];
content.categoryIdentifier = CALL_NOTIFICATION_CATEGORY;
NSDateComponents* date = [[NSDateComponents alloc] init];
date.month = dateForSchedule.month;
date.day = dateForSchedule.day;
date.hour = dateForSchedule.hour;
date.minute = dateForSchedule.minute;
UNCalendarNotificationTrigger* trigger;
trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:date repeats:NO];
UNUserNotificationCenter *centre = [UNUserNotificationCenter currentNotificationCenter];
centre.delegate = self;
// Create the request object.
UNNotificationRequest* request = [UNNotificationRequest requestWithIdentifier:self.callSchedule.id content:content trigger:trigger];
[centre addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error)
{
if (error != nil) {
NSLog(@"%@", error.localizedDescription);
}
}];
}
-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler{
//Called when a notification is delivered to a foreground app.
NSLog(@"Userinfo %@",notification.request.content.userInfo);
completionHandler(UNNotificationPresentationOptionAlert);
}
-(void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void(^)(void))completionHandler{
//Called to let your app know which action was selected by the user for a given notification.
NSLog(@"Userinfo %@",response.notification.request.content.userInfo);
}

我能够在正确的时间收到通知。我已经从您的代码片段中获取了所有代码，只需进行非常小的更改即可运行代码。你可以看看你是否发现了任何不同的东西。

希望这个建议对您有所帮助！