从 NSDate 中提取日期和时间 - Objective C

Extract Date and Hour from NSDate - Objective C

我有 dateString 这种格式 "mm/dd/yyyy '-' HH:mm"。 我想提取字符串中的日期和字符串中的小时。 我尝试了以下代码,但是 return 日期错误:

- (void) extractDate: (NSString *)dateString intoHour: (NSString *)hourLabel and: (NSString*)dateLabel {
    NSDateFormatter *formatter=[[NSDateFormatter alloc]init];
    [formatter setDateFormat:@"mm/dd/yyyy '-' HH:mm"];
    NSData *date = [formatter dateFromString:dateString];

    NSDateComponents *components = [[NSCalendar currentCalendar] components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear | NSHourCalendarUnit | NSMinuteCalendarUnit fromDate:date];

    hourLabel = [NSString stringWithFormat:@"%lu:%lu", [components hour], [components minute]];
    dateLabel = [NSString stringWithFormat:@"%lu/%lu/%lu", [components day], [components month], [components year]];
}

示例字符串:"05/01/2015 - 11:15"

结果:日期:1/1/2015,时间:11:15 还有我如何维护这种日期格式 dd/mm/yyyy,我的意思是当日期是 1 时,它显示 01

未测试但是:

MM 这个月。不是 mm,它是分钟。

您已经有了 NSDateFormatter 那么为什么不再使用它来代替 NSDateComponentsNSString 格式呢?

NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"MM/dd/yyyy '-' HH:mm"];
NSDate *date = [formatter dateFromString:dateString];

//Now you have the correct date. So we'll use the NSDateFormatter to transform NSDate (date) into NSString according to the format we need.

[formatter setDateFormat:@"MM/dd/yyyy"];
dateLabel = [formatter stringFromDate:date];
[formatter setDateFormat:@"HH:mm"];
hourLabel = [formatter stringFromDate:date];

hourLabel/dateLabel 因为 NSString 而不是 UILabel 是一个误导性的 var 命名。