NSDate 获取明天、后天的日期

    NSDate *  senddate=[NSDate date];
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateComponents *components = [gregorian components:NSCalendarUnitWeekday | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:senddate];

//今天
    [components setDay:([components day])];

//明天

    [components setDay:([components day]+1)];  

//后天

    [components setDay:([components day]+2)];
    NSDate *beginningOfWeek = [gregorian dateFromComponents:components];
    NSDateFormatter *dateday = [[NSDateFormatter alloc] init];
    [dateday setDateFormat:@"yyyy/MM/dd"];
    NSString * dataStri = [NSString stringWithFormat:@"%@",[dateday stringFromDate:beginningOfWeek]];;
    NSLog(@"dataStri==%@",dataStri);