ios - UILocalNotification repeatInterval 20 天

Question

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

我真正需要的是连续 21 天重复通知，然后在 7 天后不启动它，然后是新的 21 天有通知和 7 天没有通知......等等。即使应用程序处于非事件状态，我也应该安排所有这些天。

为此，我决定创建一个 21 条通知，自触发日期起，repeatInterval = 28days(这里是问题所在)

Answer 1

试试这个，您可以通过选择 setDay、setMonth、.... 来更改间隔:

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];
}

---

如果你想设置一个特定的时间，之后 UILocalNotifications 应该出现，你可以创建一个上述解决方案的方法并循环一个数组，它指示你想要显示通知的日期:

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];
}