Question

我想使用自定义间隔重复（例如每20天）创建本地通知。我知道我们有NSDayCalendarUnit，kCFCalendarUnitMonth ...但我希望在20天设置重复间隔。我不想每天都创建通知。

我真正的需要是连续21天重复通知，然后在7天后再发布通知，然后是通知的新21天和没有...等的7天。即使应用程序处于非活动状态，我也应安排所有这些日子。

要做到这一点，我决定创建21个通知，因为fireInterval = 28days的火灾日期（这是问题）

Answer 1

尝试此操作，您可以选择setDay，setMonth，....来更改实际情况：

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];
}

如果您想设置一个特定时间，之后UILocalNotifications应该出现，您可以创建上述解决方案的方法并循环显示您希望显示通知的日期：

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];
}

这是你必须调用的方法

+ (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

如果您希望将来从当前时间开始安排UILocalNotification 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];
}

您需要修改UILocalNotification以获取消息，声音等，然后在完成自定义后触发通知。

20天内UILocalNotification repeatInterval

2 个答案: