ios-求两个时间差

NSTimeInterval time1 = [@"1460428880" doubleValue];

NSDate *date1 = [NSDate dateWithTimeIntervalSince1970:time1];

NSTimeInterval time2 = [@"1460448024" doubleValue];

NSDate *date2 = [NSDate dateWithTimeIntervalSince1970:time2];

NSLog(@"%@**************%@",date1,date2);

NSCalendar *cal = [NSCalendar currentCalendar];

unsigned int unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;

NSDateComponents *d = [cal components:unitFlags fromDate:date1 toDate:date2 options:0];

//总共有多少秒

long sec = [d hour]*3600+[d minute]*60+[d second];

NSLog(@"%ld小时 %ld分钟 %ld秒",[d hour],[d minute],[d second]);