Ios UIC标签不更新XCode

我对iOS开发非常陌生。我开发了一个代码，但它没有更新任何标签。我做错了什么？ 代码如下。我正在使用故事板，导航正常工作，但无法更新UILabel

//  TodayScheduleViewController.m

@interface TodayScheduleViewController ()
@end


@implementation TodayScheduleViewController

@synthesize timeNowLabel;
@synthesize timeNow;
@synthesize lampImage;
@synthesize groupSchedule;
@synthesize lightStatus;
@synthesize timeRemaining;
@synthesize dayOfWeek;

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - View lifecycle

 -(void)viewDidLoad
{
    [super viewDidLoad];
    // This will pass the values of to UILabel every time the view will load


    NSDate *currentTime = [NSDate date];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"hh-mm"];
    NSString *resultString = [dateFormatter stringFromDate: currentTime];
    self.timenowlabel.text = resultString;

    NSDateComponents *dateComps = [[NSDateComponents alloc] init];
    NSInteger weekday = [dateComps weekday];
    if (weekday==1) {dayOfWeek = @"Sunday";}
    else if(weekday==2){dayOfWeek = @"Monday";}
    else if(weekday==3){dayOfWeek = @"Tuesday";}
    else if(weekday==4){dayOfWeek = @"Wednesday";}
    else if(weekday==5){dayOfWeek = @"Thursday";}
    else if(weekday==6){dayOfWeek = @"Friday";}
    else if(weekday==7){dayOfWeek = @"Saturday";}

    self.dayofweek.text = self.dayOfWeek;


    groupSchedule = [NSString stringWithFormat:@"%d", GroupNumber];
    self.groupschedule.text = self.groupSchedule;

    self.lightstatus.text = @"This is it";

}

头文件如下所示：

@interface TodayScheduleViewController : UIViewController

// These 2 NSString objects are created because it will pass the values to the UILabels
@property (weak, nonatomic) NSString *timeNowLabel;
@property (weak, nonatomic) NSString *timeNow;
@property (weak, nonatomic) NSStream *lampImage;
@property (weak, nonatomic) NSString *groupSchedule;
@property (weak, nonatomic) NSString *lightStatus;
@property (weak, nonatomic) NSString *timeRemaining;
@property (weak, nonatomic) NSString *dayOfWeek;

// These are the outlets of the UILabels that we want to change based on the button selected
@property (strong, nonatomic) IBOutlet UILabel *timenowlabel;
@property (strong, nonatomic) IBOutlet UILabel *time_now;
@property (strong, nonatomic) IBOutlet UIImageView *lampimage;
@property (strong, nonatomic) IBOutlet UILabel *groupschedule;
@property (strong, nonatomic) IBOutlet UILabel *lightstatus;
@property (strong, nonatomic) IBOutlet UILabel *timeremaining;
@property (strong, nonatomic) IBOutlet UILabel *dayofweek;


@end

---

通过使用断点，我能够追溯dayOfWeek标签未更新的原因：

[dateComps weekday]返回的最大值是NSInteger可以在一周中的某一天使用的最大值。这是因为您以错误的方式初始化了NSDateComponents*dateComps：

    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *dateComps = [calendar components:(NSWeekdayCalendarUnit) fromDate:[NSDate date]];

在你的情况下，这是正确的方法

---

现在，请尝试使用断点回溯其他标签没有更新的原因，因为您没有为我提供足够的代码进行更新。

感谢大家的支持。 我可以更新为

    NSDate *currentTime = [NSDate date];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"HH:mm"];
    NSString *resultString = [dateFormatter stringFromDate: currentTime];
    self.time.text = resultString;

/*    NSDateComponents *dateComps = [[NSDateComponents alloc] init];

    NSInteger weekday = [dateComps weekday];
    if (weekday==1) {self.dayofweek.text = @"Sunday";}
    else if(weekday==2){self.dayofweek.text = @"Monday";}
    else if(weekday==3){self.dayofweek.text = @"Tuesday";}
    else if(weekday==4){self.dayofweek.text = @"Wednesday";}
    else if(weekday==5){self.dayofweek.text = @"Thursday";}
    else if(weekday==6){self.dayofweek.text = @"Friday";}
    else if(weekday==7){self.dayofweek.text = @"Saturday";}*/

    [dateFormatter setDateFormat: @"EEEE"];
    self.dayofweek.text = [dateFormatter stringFromDate:currentTime];

---

再次感谢。

在故事板中，标签是否链接为IBOutlet？是的，我已通过按住ctrl键并拖动到头文件中的方式将其附加。hm。。。我认为所提供的代码没有任何问题。IBOutlet最好是弱属性，而NSString应该定义为copy。我上传了一个基于你的代码，一切正常。非常感谢，我会试试这个。嗨，hoiberg42，谢谢其他标签正在工作，但它说日历是未声明的，我确实忘记了声明日历。我会更新我的答案。