gistfile1.m

- (void)constructButtons {
    self.numberOfMonths = 1 + self.pastOffset + self.futureOffset;
    
    NSMutableArray *buttons = [[NSMutableArray alloc] init];
    
    // Loop from i - self.pastOffset to i <= self.futureOffset + 1 to include start month
    for ( int i = -[[NSNumber numberWithInteger:self.pastOffset] intValue]; i <= self.futureOffset + 1; i++ ) {
        NSDateComponents *offSetComponents = [[NSDateComponents alloc] init];
        
        UIButton *button = [[UIButton alloc] initWithFrame:CGRectZero];
        button.translatesAutoresizingMaskIntoConstraints = NO;
        
        [offSetComponents setMonth:i];
        NSDate *previousMonth = [[NSCalendar currentCalendar] dateByAddingComponents:offSetComponents toDate:self.startDate options:0];
        
        
        NSString *formattedString = [DateFactory shortMonthFromDate:previousMonth];
        NSLog(@"formatted month %@", formattedString);
        [button setTitle:[DateFactory shortMonthFromDate:previousMonth] forState:UIControlStateNormal];
        [button setTitleColor:[UIColor blackColor] forState:UIControlStateSelected];
        [button setTitleColor:[UIColor colorWithRed: 0.682 green: 0.682 blue: 0.682 alpha: 1] forState:UIControlStateNormal];
        [button setBackgroundColor:[UIColor redColor]];
        [self.buttonWrapper addSubview:button];
        
        [buttons addObject:button];
        
        CGFloat multiplier = 1 / [[NSNumber numberWithInteger:self.numberOfMonths] floatValue];
        [button mas_makeConstraints:^(MASConstraintMaker *make) {
            make.height.equalTo(self.buttonWrapper.mas_height);
            make.width.equalTo(self.buttonWrapper.mas_width).multipliedBy(multiplier);
            make.leading.equalTo(self.buttonWrapper.mas_leading);
            make.centerY.equalTo(self.buttonWrapper.mas_centerY);
        }];
    }

    self.buttons = buttons;
}