Question

我无法使用UIDatePicker。我只是想在所有评论者告诉我只使用UIDatePicker之前将其抛弃。我希望有一个Picker Wheel，显示一年中的所有日期，直到今天，并显示为Day：1 / Jan 1，Day：2 / Jan 2，依此类推。以下是我到目前为止的内容，它可以检测当年的“天数”，并在PickerWheel中填入今天所有日期：

NSCalendar *currentCalendar = [NSCalendar currentCalendar];
    NSDate *today = [NSDate date];

    NSInteger dc = [currentCalendar  ordinalityOfUnit:NSDayCalendarUnit
                                               inUnit:NSYearCalendarUnit
                                              forDate:today];
    options = [[NSMutableArray alloc]init];

    for (int index = 1; index <= dc; index++)
    {
        NSString *pickerItemTitle = [NSString stringWithFormat: @"Day: %d", index];
        [options addObject: pickerItemTitle];
    }

我可以做些什么来使NSInteger与日期匹配，并且它也是pickerItemTitle的一部分？

Answer 1

弄清楚了。添加了一些代码，以形成基于日期整数的日期到循环中。现在，为uipickerview设置数组的viewWillAppear方法如下所示：

- (void)viewWillAppear:(BOOL)animated
{

    NSCalendar *currentCalendar = [NSCalendar currentCalendar];
    NSDate *today = [NSDate date];

    NSInteger dc = [currentCalendar  ordinalityOfUnit:NSDayCalendarUnit
                                               inUnit:NSYearCalendarUnit
                                              forDate:today];
    options = [[NSMutableArray alloc]init];

    for (int index = 1; index <= dc; index++)
    {
        NSDateComponents *components = [[NSDateComponents alloc] init];
        [components setDay:index];
        NSCalendar *gregorian = [[NSCalendar alloc]
                                 initWithCalendarIdentifier:NSGregorianCalendar];
        NSDate *date = [gregorian dateFromComponents:components];
        NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
        [formatter setDateFormat:@"MMM dd"];
        NSString *articleDateString = [formatter stringFromDate:date];
        NSString *pickerItemTitle = [NSString stringWithFormat: @"Day: %d/%@", index, articleDateString];
        [options addObject: pickerItemTitle];
    }
    [super viewWillAppear:YES];  
}

UIPickerView与自定义日期

1 个答案: