Question

我正在尝试从2个NSStrings创建一个NSDate对象。

其中一个NSStrings的格式为==＆gt; mm / dd / yyyy（以下样本中的g.date）

另一种形式为==＆gt; hh：mm am / pm（以下样本中的g.time）

以下代码：

for(Game *g in _games) {
    NSDateFormatter *format = [[NSDateFormatter alloc] init];
    [format setDateFormat:@"dd'/'MM'/'yyyy HH':'mm"];
    NSString *dateString = [NSString stringWithFormat:@"%@ %@", g.date, g.time];
    dateString = [dateString substringToIndex:[dateString length]-3];
    NSDate *date = [format dateFromString:dateString];
    NSLog(@"%@ ==> %@", dateString, date);
}

产生不准确和不可预测的输出，如下所示：

2012-04-30 19:39:06.923 MLP[27866:fb03] 05/03/2012 8:30 ==> 2012-03-05 13:30:00 +0000
2012-04-30 19:39:06.923 MLP[27866:fb03] 05/03/2012 8:45 ==> 2012-03-05 13:45:00 +0000
2012-04-30 19:39:06.924 MLP[27866:fb03] 03/29/2012 9:30 ==> (null)
2012-04-30 19:39:06.924 MLP[27866:fb03] 03/29/2012 8:15 ==> (null)
2012-04-30 19:39:06.925 MLP[27866:fb03] 03/01/2012 9:15 ==> 2012-01-03 14:15:00 +0000
2012-04-30 19:39:06.925 MLP[27866:fb03] 05/03/2012 9:00 ==> 2012-03-05 14:00:00 +0000
2012-04-30 19:39:06.926 MLP[27866:fb03] 03/29/2012 9:00 ==> (null)
2012-04-30 19:39:06.926 MLP[27866:fb03] 05/03/2012 9:15 ==> 2012-03-05 14:15:00 +0000

我正在切断时间字符串的AM / PM部分，因为我无法找到如何在NSDateFormatter语法中指示它的存在。我怎么能这样做？

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Pachun

Answer 1

为未来可能遇到此问题的任何人解决这个问题。这就是修正它的原因：

// Sort by date
- (NSComparisonResult)compare:(Game *)g {

    // Parse date's strings to an NSDate
    NSDateFormatter *format = [NSDateFormatter new];
    [format setDateFormat:@"MM/dd/yyyy hh:mma"];

    NSString *otherDateString;
    NSString *myDateString;

    if([g.time length]==7)
        otherDateString = [NSString stringWithFormat:@"%@ 0%@", g.date, g.time];
    else otherDateString = [NSString stringWithFormat:@"%@ %@", g.date, g.time];
    if([_time length]==7)
        otherDateString = [NSString stringWithFormat:@"%@ 0%@", _date, _time];
    else otherDateString = [NSString stringWithFormat:@"%@ %@", _date, _time];

    NSDate *otherDate = [format dateFromString:otherDateString];
    NSDate *myDate = [format dateFromString:myDateString];

    return [myDate compare:otherDate];
}

NSDate从12小时开始

1 个答案: