objective-c - 比较小时和分钟与当前时间

Question

我收到两个字符串： "from"="12:30" 和 "to"="14:30" 这是两个 NSString 对象。我想检查当前时间是否在两个收到的时间之间。最好的方法是什么？谢谢。

Answer 1

从输入日期获取小时/分钟组件：

NSCalendar *gregorianCal = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *dataComps = [gregorianCal components: (NSHourCalendarUnit | NSMinuteCalendarUnit) fromDate:yourDate];

NSInteger minutes = [dateComps minute];
NSInteger hours = [dateComps hour];

然后拆分时间字符串并比较分钟和小时。另一种方法是将字符串转换为NSDates 并比较日期。

Answer 2

Aravindhanarvi 提出的第二个解决方案可能如下所示......

NSString *time1 = @"12:30";
NSString *time2 = @"14:30";

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"HH:mm";
// ignore time zone of device
formatter.timeZone = [NSTimeZone timeZoneForSecondsFromGMT:0]; 

NSDate *date1 = [formatter dateFromString:time1];
NSDate *date2 = [formatter dateFromString:time2];
NSDate *now   = [NSDate date];

BOOL inBetween = ([now compare:date1] == NSOrderedDescending 
               && [now compare:date2] == NSOrderedAscending);

Answer 3

- (BOOL)date:(NSDate*)date isBetweenDate:(NSDate*)beginDate andDate:(NSDate*)endDate
{
    if ([date compare:beginDate] == NSOrderedAscending)
        return NO;

    if ([date compare:endDate] == NSOrderedDescending) 
        return NO;

    return YES;
}