Question

我有一个包含大量标签的视图，每个标签对应一个工作日和一种任务。我想从核心数据加载信息并使用该信息来设置每个标签的文本。

#import "WeekViewController.h"

@implementation WeekViewController

- (void) viewDidLoad {

    gregorian = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
    [gregorian setFirstWeekday:2];

    mondayMeetings = 0;
    mondayPhoneCalls = 0;
    mondayToDos = 0;

    tuesdayMeetings = 0;
    tuesdayPhoneCalls = 0;
    tuesdayToDos = 0;

    wednesdayMeetings = 0;
    wednesdayPhoneCalls = 0;
    wednesdayToDos = 0;

    thursdayMeetings = 0;
    thursdayPhoneCalls = 0;
    thursdayToDos = 0;

    fridayMeetings = 0;
    fridayPhoneCalls = 0;
    fridayToDos = 0;

    saturdayMeetings = 0;
    saturdayPhoneCalls = 0;
    saturdayToDos = 0;

    sundayMeetings = 0;
    sundayPhoneCalls = 0;
    sundayToDos = 0;

    [self loadInfo:[NSDate date]];

}

- (void) loadInfo:(NSDate *)date {

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(Date >= %@) AND (Date <= %@)", [self dateByMovingToBeginningOfWeek:self.selectedDate], [self dateByMovingToEndOfWeek:self.selectedDate]];

    request = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Task" inManagedObjectContext:managedObjectContext];
    [request setEntity:entity];
    [request setPredicate:predicate];

    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"Date" ascending:NO];
    NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
    [request setSortDescriptors:sortDescriptors];
    [sortDescriptors release];
    [sortDescriptor release];

    NSError *error = nil;

    mutableFetchResults = [[managedObjectContext executeFetchRequest:request error:&error] mutableCopy];
    if (mutableFetchResults == nil) {

    }

    for (int i = 0; i < [mutableFetchResults count]; i++) {

        Task *aTask = (Task *)[mutableFetchResults objectAtIndex:i];

        NSDateComponents *comps = [gregorian components:NSWeekdayCalendarUnit fromDate:aTask.Date];

        int weekday = [comps weekday];

        if (weekday == 1  && [aTask.Type isEqualToString:@"PhoneCall"]) {

            mondayPhoneCalls ++;

        }

    }

    NSLog(@"%d", mondayPhoneCalls);

    for (UILabel *go in [self.view subviews]) {

        if (go.tag == 1) {

            go.text = [NSString stringWithFormat:@"%i", mondayPhoneCalls];

        }

    }

}

- (NSDate *) dateByMovingToEndOfWeek:(NSDate *)date {
    unsigned int flags = NSYearCalendarUnit | NSMonthCalendarUnit | NSWeekdayCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;

    NSDateComponents *parts = [gregorian components:flags fromDate:date];

    [parts setWeekday:7];
    [parts setHour:23];
    [parts setMinute:59];
    [parts setSecond:59];

    return [gregorian dateFromComponents:parts];

}

- (NSDate *) dateByMovingToBeginningOfWeek:(NSDate *)date {

    unsigned int flags = NSYearCalendarUnit | NSMonthCalendarUnit | NSWeekdayCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;

    NSDateComponents *parts = [gregorian components:flags fromDate:date];

    [parts setWeekday:0];
    [parts setHour:0];
    [parts setMinute:0];
    [parts setSecond:0];

    return [gregorian dateFromComponents:parts];

}

@end

但它只注册一个任务，如果它的日期是当前日期（顺便说一句）。也可以有人想到一种更有效的方法来设置每个标签的文本，而不是每个标签都有一个插座，或者循环浏览所有视图的子视图并检查它们的标签？

任何帮助都非常感激。

Answer 1

您的谓词现在说“日期为今天或更晚的对象，其日期是今天或更早的日期”。满足该要求的唯一对象是具有今天日期的对象。

对于您的其他问题，您可以查看IBOutletCollection。它们用于类似对象的集合（在您的情况下为UILabel）。它基本上是IB对象的NSArray，您可以循环并轻松设置它们的值。

从核心数据加载日期

1 个答案: