无法在segue中设置UIDatePicker的日期

时间:2013-02-04 04:35:15

标签: ios objective-c uidatepicker

我有一个带有多个闹钟的闹钟应用程序。

有一个AlarmListViewController,它是一个包含警报列表的UITableView。选择行后,会向AlarmViewController(详细视图)启动segue。除了日期之外,其他所有内容都从AlarmListViewController正确传递到AlarmViewController。

我应该提到fullDate是NSDate上的一个类别,可以更轻松地打印NSDate。

以下是代码:

头:

AlarmViewController.h

@interface AlarmViewController : UITableViewController <UITableViewDataSource, UITableViewDelegate>

@property (weak, nonatomic) IBOutlet UIDatePicker *timeSelected;
@property (nonatomic, strong) NSMutableArray *repeatSelection;
@property (nonatomic, strong) NSString *alarmID;

@end

实现:

AlarmViewController.m

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSLog(@"---VIEW DID LOAD---, current date: %@", [[NSDate date] fullDate]);
    NSLog(@"alarmID: %@", self.alarmID);
    NSLog(@"repeat: %@", self.repeatSelection);
    NSLog(@"time: %@", [self.timeSelected.date fullDate]);

}

prepareForSegue:

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    NSLog(@"self.selectedCell: %d", self.selectedCell);
    if ([segue.identifier isEqualToString:@"alarmDetail"] || [segue.identifier isEqualToString:@"addAlarm"])
    {
        AlarmViewController *aVC = (AlarmViewController *)[segue destinationViewController];
        if (self.tableView.editing)
        {
            NSDictionary *setting = [self.alarmList objectAtIndex:self.selectedCell];
            NSLog(@"setting.time = %@", [[setting objectForKey:@"time"] fullDate]);

            aVC.repeatSelection = [setting objectForKey:@"repeat"];
            aVC.alarmID = [setting objectForKey:@"alarmID"];
            aVC.timeSelected.date = [setting objectForKey:@"time"];
        }
    }
}

1 个答案:

答案 0 :(得分:1)

在加载视图之前,您无法设置UI元素的值,这是您在prepareForSegue中设置日期选择器日期时尝试执行的操作。相反,您需要将日期传递给aVC,然后在其viewDidAppear方法中,将日期选择器的日期设置为日期传递的日期(您需要aVC中的属性来保存该日期)。