我开发的很多项目中都有用到计算时间差的地方，这里把我封装的一个小方法分享给需要的朋友，当然主要是初学者们，哈哈。
主要使用了NSDate、NSCalender、NSComponents三个类，这三个类里面的方法很多，大家都可以浏览一下，特别需要注意方法后面的版本限制，注意使用不要出现版本适配问题。废话不多，直接Show you the code：
首先是.h
1 /** 2 * 计算时间差 3 * 4 * @param startDate 开始时间 5 * @param endDate 结束时间 6 * 7 * @return 时间差 8 */ 9 + (NSDateComponents *)calculateTimeDifferenceWithStartDateString:(NSString *)startString endDateString:(NSString *)endString; 10 + (NSDateComponents *)calculateTimeDifferenceWithStartDate:(NSDate *)startDate endDate:(NSDate *)endDate; 11 + (NSDateComponents *)calculateAgeWithDate:(NSDate *)date; 12 + (NSDateComponents *)calculateAgeWithDateString:(NSString *)string;
然后是.m
1 + (NSDateComponents *)calculateTimeDifferenceWithStartDateString:(NSString *)startString endDateString:(NSString *)endString { 2 3 startString = [self dateStringFormatter:startString]; 4 endString = [self dateStringFormatter:endString]; 5 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 6 [dateFormatter setDateFormat:@"yyyyMMddHHmmss"]; 7 [dateFormatter setTimeZone:[NSTimeZone localTimeZone]]; 8 9 return [self calculateTimeDifferenceWithStartDate:[dateFormatter dateFromString:startString] endDate:[dateFormatter dateFromString:endString]]; 10 } 11 12 + (NSDateComponents *)calculateTimeDifferenceWithStartDate:(NSDate *)startDate endDate:(NSDate *)endDate { 13 14 // 日历 15 NSCalendar *calendar = [NSCalendar currentCalendar]; 16 // 日期对比项 17 NSUInteger unitFlags = NSCalendarUnitEra | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond | NSCalendarUnitWeekday; 18 19 return [calendar components:unitFlags fromDate:startDate toDate:endDate options:NSCalendarMatchStrictly]; 20 } 21 22 + (NSDateComponents *)calculateAgeWithDate:(NSDate *)date { 23 24 return [self calculateTimeDifferenceWithStartDate:date endDate:[NSDate date]]; 25 } 26 27 + (NSDateComponents *)calculateAgeWithDateString:(NSString *)dateString { 28 29 dateString = [self dateStringFormatter:dateString]; 30 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 31 [dateFormatter setDateFormat:@"yyyyMMddHHmmss"]; 32 [dateFormatter setTimeZone:[NSTimeZone localTimeZone]]; //设定日期时区 33 34 return [self calculateAgeWithDate:[dateFormatter dateFromString:dateString]]; 35 } 36 37 /** 38 * 日期字符串格式化方法 39 * 40 * @param dateString 日期字符串 41 * 42 * @return 格式化后的字符串 43 */ 44 + (NSString *)dateStringFormatter:(NSString *)dateString { 45 46 // 去日期字符串的符号 47 dateString = [dateString stringByReplacingOccurrencesOfString:@"-" withString:@""]; 48 dateString = [dateString stringByReplacingOccurrencesOfString:@":" withString:@""]; 49 dateString = [dateString stringByReplacingOccurrencesOfString:@"/" withString:@""]; 50 dateString = [dateString stringByReplacingOccurrencesOfString:@" " withString:@""]; 51 52 // 时间字符串长度超出，截取14位 53 if ([dateString length] > 14) { 54 dateString = [dateString substringToIndex:13]; 55 } 56 57 // 时间字符串长度不够，补0 58 while ([dateString length] < 14) { 59 dateString = [dateString stringByAppendingString:@"0"]; 60 } 61 62 return dateString; 63 }
谢谢观看！