Question

我创建了一个数字时钟，图像从0.png到9.png。此时钟工作正常。时钟显示的默认时间格式为24格式。我希望时钟以12小时的格式显示时间。我已经完成了以下代码，但问题是它总是以24小时格式显示时间：

- (void)viewDidLoad {
    //timer to recursively call the showClock method.
    twentyfourhour = YES;
    timer=[NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(showClock) userInfo:nil repeats:YES];  
    [super viewDidLoad];
}



-(void)showClock
{
    NSDateFormatter *dateFormat = [[[NSDateFormatter alloc] init] autorelease];
    [dateFormat setTimeStyle:NSDateFormatterNoStyle];
    NSDate * date = [NSDate date];
    NSCalendar * calendar = [[NSCalendar alloc]
                             initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents * components =
    [calendar components:(NSHourCalendarUnit | NSMinuteCalendarUnit) fromDate:date];
    if (twentyfourhour == YES) {
        twentyfourhour = [components hour]%12;
        int hour = twentyfourhour ? [components hour] : [components hour] % 12;
        NSLog(@"%d",hour);  
        NSInteger minute = [components minute];
        NSInteger firstHourDigit = hour/12;
        NSInteger secondHourDigit = hour%10;
        NSInteger firstMinuteDigit = minute/10;
        NSInteger secondMinuteDigit = minute%10;

        int res=0;
        for(int i=0;i<4;i++)
        {

            if(i==0)
                res = firstHourDigit;
            else if(i==1)
                res = secondHourDigit;
            else if (i==2)
                res = firstMinuteDigit;
            else 
                res = secondMinuteDigit;

            switch (res) {

                case 0:
                    str_imageName=@"0.png";
                    break;
                case 1:
                    str_imageName=@"1.png";
                    break;
                case 2:
                    str_imageName=@"2.png";
                    break;
                case 3:
                    str_imageName=@"3.png";
                    break;
                case 4:
                    str_imageName=@"4.png";
                    break;
                case 5:
                    str_imageName=@"5.png";
                    break;
                case 6:
                    str_imageName=@"6.png";
                    break;
                case 7:
                    str_imageName=@"7.png";
                    break;
                case 8:
                    str_imageName=@"8.png";
                    break;
                case 9:
                    str_imageName=@"9.png";
                    break;

                default:
                    break;
            }
            if(i==0)
                [minfirstImage setImage:[UIImage imageNamed:str_imageName]];
            else if(i==1)
                [minsecondImage setImage:[UIImage imageNamed:str_imageName]];
            else if (i==2)
                [secfirstImage setImage:[UIImage imageNamed:str_imageName]];
            else 
                [secSecondImage setImage:[UIImage imageNamed:str_imageName]];
        }
    }
    else
    {


    int hour1 = [components hour];
    NSInteger minute = [components minute];
    NSInteger firstHourDigit = hour1/10;
    NSInteger secondHourDigit = hour1%10;
    NSInteger firstMinuteDigit = minute/10;
    NSInteger secondMinuteDigit = minute%10;

    int res=0;
    for(int i=0;i<4;i++)
         {

             if(i==0)
                res = firstHourDigit;
         else if(i==1)
                 res = secondHourDigit;
            else if (i==2)
                 res = firstMinuteDigit;
             else 
                 res = secondMinuteDigit;

                 switch (res) {

                     case 0:
                     str_imageName=@"0.png";
                     break;
                     case 1:
                     str_imageName=@"1.png";
                     break;
                    case 2:
                     str_imageName=@"2.png";
                     break;
                     case 3:
                     str_imageName=@"3.png";
                     break;
                    case 4:
                    str_imageName=@"4.png";
                    break;
                    case 5:
                    str_imageName=@"5.png";
                    break;
                    case 6:
                     str_imageName=@"6.png";
                    break;
                    case 7:
                    str_imageName=@"7.png";
                    break;
                    case 8:
                    str_imageName=@"8.png";
                    break;
                    case 9:
                    str_imageName=@"9.png";
                     break;

                    default:
                    break;
                }
            if(i==0)
            [minfirstImage setImage:[UIImage imageNamed:str_imageName]];
            else if(i==1)
                [minsecondImage setImage:[UIImage imageNamed:str_imageName]];
            else if (i==2)
                [secfirstImage setImage:[UIImage imageNamed:str_imageName]];
            else 
                [secSecondImage setImage:[UIImage imageNamed:str_imageName]];


         }  

    }


}

Answer 1

- (void)viewDidLoad {
//timer to recursively call the showClock method.
twentyfourhour = YES;
timer=[NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(showClock) userInfo:nil repeats:YES];  
[super viewDidLoad];
}

它在顶部说二十四小时是否与它有关？也许改变它，看它是否有所作为。

Answer 2

我可以看到一个可能影响你逻辑的地方。

twentyfourhour = [components hour]%12;

每当“小时”不是12的倍数时，你将获得一个非零值，因此9小时将导致9小时和15小时将导致3.因为它们不是零，所以你的twerntyfourhour将被视为是那些作业。

我希望这可以帮助你进一步解决问题。

如何以12小时格式制作数字时钟显示器

2 个答案: