带有自定义日期的 UIPickerView

Posted 2023-02-24

【中文标题】带有自定义日期的 UIPickerView

【英文标题】：UIPickerView With Custom Dates

【发布时间】：2013-01-05 19:34:02

【问题描述】：

我不能使用 UIDatePicker。在所有评论者告诉我只使用 UIDatePicker 之前，我只想在一开始就把它扔掉。我想要一个显示一年中所有日子的选择轮，直到今天，并将其显示为 Day: 1/Jan 1, Day: 2/Jan 2 等等。这是我到目前为止所拥有的，它检测一年中的哪一天“数字”，并用直到今天的所有日期填充 PickerWheel：

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它也匹配 NSInteger 与日期，并让它成为 pickerItemTitle 的一部分？

【参考方案1】：

想通了。添加了一些代码以在循环中形成基于日期整数的日期。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];