weekOfYear不工作

Question

我最近将Xcode更新到版本6.0，当我这样做时，我被警告已弃用NSDateComponents week方法，并且新的weekOfYear方法取代了它。我相信这些方法应该返回1到52年之间的一周序数。但是weekOfYear带来的价值超过了52。

我用来测试它的代码如下。有人可以帮我核实一下，如果我做错了，请告诉我那是什么？

- (void)testWeekOfYearMethod
{
    NSLog(@"Inside testWeekOfYearMethod...");

    NSDate *date = [NSDate date];

    //NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSCalendar *gregorian = [NSCalendar currentCalendar];

    NSDateComponents *weekdayComponents = [gregorian components:NSWeekCalendarUnit fromDate:date];

    NSInteger weekOrdinal = [weekdayComponents weekOfYear];

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd 'at' HH:mm"];

    NSString *formattedString = [dateFormatter stringFromDate:date];
    NSLog(@"In getWeekContainingDate(), Date: %@ has week %ld", formattedString, [[NSNumber numberWithInteger:weekOrdinal] integerValue]);
}

Answer 1

weekOfYear只是访问您创建的NSDateComponents的相应部分。您的示例未指定选项NSWeekOfYearCalendarUnit，因此无法访问任何内容！

将其添加到您的选项中，您应该得到您期望的结果：

NSDateComponents *weekdayComponents = [gregorian components:(NSWeekCalendarUnit | NSWeekOfYearCalendarUnit) fromDate:date];