日历事件应用程序的核心数据谓词

Question

我是一个新手程序员，在这个问题上我已经挣扎了两个星期。我正在使用cocoapods的JTCalendar。它被设计成在- (BOOL)calendarHaveEvent:(JTCalendar *)calendar date:(NSDate *)date {下返回一个日期，该日期将作为一个点出现在日历上以显示一个事件。为了保存我的事件，我使用以下代码：

AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
                 NSManagedObjectContext *context = [appDelegate managedObjectContext];
NSManagedObject *savedate;
                 savedate = [NSEntityDescription insertNewObjectForEntityForName:@"AlarmData" inManagedObjectContext:context];
                 [savedate setValue:CT forKey:@"alarmDate"];

                 [context save:&error];

                BOOL isSaved = [appDelegate.managedObjectContext save:&error];

                 NSLog(@"success!!!!, %@", savedate);

并尝试获取日期并“返回”该日期：

‘

- (BOOL)calendarHaveEvent:(JTCalendar *)calendar date:(NSDate *)date
{
    AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
    NSManagedObjectContext *context = [appDelegate managedObjectContext];





    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"dd-MM-yyyy"];
    NSString *textDate = [NSString stringWithFormat:@"%@",[dateFormatter stringFromDate:[NSDate date]]];
    NSLog(@"Date %@",textDate);

     NSDate *startDate = [dateFormatter dateFromString:@"31-12-1981"];
    NSDate *endDate = [dateFormatter dateFromString:@"31-12-2999"];


    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(alarmDate >= %@) AND (date <= %@)", startDate, endDate];

    NSFetchRequest *request = [[NSFetchRequest alloc] init];
    [request setEntity:[NSEntityDescription entityForName:@"AlarmData" inManagedObjectContext:context]];
    [request setPredicate:predicate];

    NSError *error;
    NSArray *matchingData = [context executeFetchRequest:request error:&error];

        NSString *alarmDate =  [ NSString  stringWithFormat:@"dd-MM-yyyy"];

        for (NSManagedObject *obj in matchingData) {
            alarmDate = [obj valueForKey:@"alarmDate"];

            return alarmDate;'

不幸的是，结果是这样的，每一个约会似乎都会在下面有一个点：

https://drive.google.com/file/d/0Bw0Kf2Z9-yb8Zm5LWnZUUkRJRzQ/view?usp=sharing

我只想有我的单身约会回来，被困在这很长时间。谢谢!

Answer 1

for (NSManagedObject *obj in matchingData) {
            alarmDate = [obj valueForKey:@"alarmDate"];

            return alarmDate;'

您总是返回第一个对象的alamrDate，不管您在方法的参数中有什么日期。使用您的参数检查日期，然后返回是否有此日期的警报。