日历事件应用程序的核心数据谓词

Question

我是一名新手程序员，我已经在这个问题上苦苦挣扎了两个星期。我正在使用来自 cocoapods 的 JTCalendar。它旨在 return - (BOOL)calendarHaveEvent:(JTCalendar *)calendar date:(NSDate *)date { 下的日期它将在日历上显示为一个点以显示事件。为了保存我的活动，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);

和以下尝试获取日期和 "return" 它：

'

- (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;'

遗憾的是，结果看起来像这样，每个日期似乎都 return 下方有一个点：

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

我只想有我的单身约会returned，卡在这上面好久了。谢谢！

Answer 1

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

            return alarmDate;'

您总是 return 第一个对象的 alamrDate，无论您的方法参数中的日期是什么。使用您的参数检查日期，然后 return 是否有针对该日期的警报。

日历事件应用程序的核心数据谓词

Core data predicate for a calendar event app

ios

xcode

core-data

calendar

nspredicate