objective-c - 获得前导零的时间

Question

Here是我之前关于在 Objective-C 中使用日期的问题。如何获取带前导零的小时、分钟和秒？

Answer 1

既然您已经明确需要将小时、分钟和秒作为字符串，下面是获取它们的方法:

NSDateComponents *components = [[NSCalendar currentCalendar] components:NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit fromDate:[NSDate date]]; 

NSInteger hour= [components hour];   
NSInteger minute = [components minute];
NSInteger second = [components second];

NSString *hourString = [NSString stringWithFormat:@"%02d", hour];
NSString *minuteString = [NSString stringWithFormat:@"%02d", minute];
NSString *secondString = [NSString stringWithFormat:@"%02d", second];

关键是在格式化的时候使用"%02d"，保证得到两位数。