UILocalNotification repeatInterval在20天

Question

我想创建具有自定义间隔重复的本地通知（例如，每20天）。 我知道我们有NSDayCalendarUnit，kCFCalendarUnitMonth ...，但我希望将重复间隔设置为20天。 我不想每天都创建一个通知。

我真正的需要是连续21天重复一次通知，然后在7天后不启动它，然后再进行21天有通知的工作，而在7天没有通知的情况下等。我应该安排所有这些天，即使申请是无效。

为此，我决定自发射日期起使用repeatInterval = 28days创建21条通知（这是问题所在）

Answer 1

尝试此操作，可以通过选择setDay ， setMonth ，....来更改时间间隔：

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay:3];

NSDate *date3Days = [calendar dateByAddingComponents:components 
                                               toDate:[NSDate date] 
                                              options:0];

UIApplication* app = [UIApplication sharedApplication];
NSArray*    oldNotifications = [app scheduledLocalNotifications];
if ( oldNotifications ) {
    [app cancelAllLocalNotifications];
    app.applicationIconBadgeNumber = 0;
}

UILocalNotification* notifyAlarm = [[UILocalNotification alloc] init];
if (notifyAlarm) {
    notifyAlarm.fireDate = date3Days;
    notifyAlarm.timeZone = [NSTimeZone defaultTimeZone];
    notifyAlarm.alertBody = NSLocalizedString( @"Push message", @"");
    notifyAlarm.soundName = @"sound.wav";
    [app scheduleLocalNotification:notifyAlarm];
}

---

如果要设置UILocalNotifications出现的特定时间，则可以创建上述解决方案的方法，并遍历表示您希望显示通知的日期的数组：

NSArray *arrayNumbers = @[@5, @7, @14, @21, @30, @60, @90, @120];
NSDictionary *dictNotifications = 
[[NSUserDefaults standardUserDefaults]    objectForKey:kUserDefAppStarts];

for ( NSNumber *bla in arrayNumbers ){

    NSString *strKey = [NSString stringWithFormat:@"%@%@", kUserDefAppStarts, bla];
    NSDictionary *dict = dictNotifications[strKey];
    NSString *strMessageQuestion = dict[kKeyMessage];

    [self createNotificationWithNumberOfDays:[bla integerValue]
                                  andMessage:strMessageQuestion
                                    userInfo:dict];
}

这是您必须调用的方法

+ (void)createNotificationWithNumberOfDays:(int)days 
                                andMessage:(NSString *)message 
                                  userInfo:(NSDictionary *)dict{

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay:days];

NSDate *dateAlert = [gregorian dateByAddingComponents:components toDate:[NSDate date] options:0];

UIApplication *app = [UIApplication sharedApplication];
UILocalNotification *notifyAlarm = [[UILocalNotification alloc] init];

if( notifyAlarm ){
    [notifyAlarm setFireDate:dateAlert];
    [notifyAlarm setTimeZone:[NSTimeZone defaultTimeZone]];
    [notifyAlarm setSoundName:@"soundname"];
    [notifyAlarm setAlertBody:message];
    [notifyAlarm setUserInfo:dict];
    [app scheduleLocalNotification:notifyAlarm];
}

}

Answer 2

如果您希望从当前时间开始将UILocalNotification安排在未来的20天，请执行以下操作：

NSCalendar *currentCalendar = [NSCalendar currentCalendar];
NSDateComponents *dateComp = [[NSDateComponents alloc] init];
int desiredAmountOfMonths = 4;
for (int month = 0; month < desiredAmountOfMonths; month++)
{
    dateComp.month = month;
    dateComp.day = 20;
    NSDate *fireDate = [currentCalendar dateByAddingComponents:dateComp toDate:[NSDate date] options:NSCalendarMatchNextTimePreservingSmallerUnits];

    UILocalNotification *notification = [[UILocalNotification alloc] init];
    notification.fireDate = fireDate;
    notification.timeZone = [NSTimeZone defaultTimeZone];
}

您将需要修改UILocalNotification的消息，声音等内容，然后在自定义完成后触发通知。