ios - 在设置 doesRelativeDateFormatting = YES 时，stringFromDate 返回 nil

Question

在 NSDateFormatter 文档中，

If a date formatter uses relative date formatting, where possible it replaces the date component of its output with a phrase—such as “today” or “tomorrow”—that indicates a relative date.

我正在使用以下代码:

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = [NSDateFormatter dateFormatFromTemplate:@"EEEE dMMMM',' hma"
                                                       options:0
                                                        locale:[NSLocale currentLocale]];
formatter.doesRelativeDateFormatting = YES;
NSLog(@"Date: %@", [formatter stringFromDate:[NSDate date]]);

它记录日期:。

但是在注释掉 formatter.doesRelativeDateFormatting = YES; 时输出是正确的。

日期:8 月 19 日星期二下午 1:18

我对 doesRelativeDateFormatting 的理解有误吗？

Answer 1

嗨，当我像这样修改代码时。它有效..

 NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
 formatter.dateFormat = [NSDateFormatter dateFormatFromTemplate:@"EEEE dMMMM',' hma"
                                                       options:0
                                                        locale:[NSLocale currentLocale]];
 [formatter setDateStyle:NSDateFormatterFullStyle];
 [formatter setTimeStyle:NSDateFormatterShortStyle];
 formatter.doesRelativeDateFormatting = YES;
  NSLog(@"Date: %@", [formatter stringFromDate:[NSDate date]]);