计算2个时间 相差分钟数

+ (NSString *) getTimeDiffString:(NSTimeInterval) timestamp

{

NSCalendar *cal = [NSCalendar currentCalendar];

NSDate *todate = [NSDate dateWithTimeIntervalSince1970:timestamp];

NSDate *today = [NSDate date];//当前时间

unsigned int unitFlag = NSDayCalendarUnit | NSHourCalendarUnit |NSMinuteCalendarUnit;

NSDateComponents *gap = [cal components:unitFlag fromDate:today toDate:todate options:0];//计算时间差

if (ABS([gap day]) > 0)

{

return [NSString stringWithFormat:@"%ld天前", (long)(ABS([gap day]))];

}else if(ABS([gap hour]) > 0)

{

return [NSString stringWithFormat:@"%ld小时前", (long)(ABS([gap hour]))];

}else

{

if((long)(ABS([gap minute]))==0)

{

return @"刚刚";

}

return [NSString stringWithFormat:@"%ld分钟前",  (long)(ABS([gap minute]))];

}

}