- (void)viewWillAppear:(BOOL)animated {
CGRect watchersRect = CGRectMake(0, 20, 320, 460);
UIView *colorLayer = [[UIView alloc]initWithFrame:watchersRect];
colorLayer.backgroundColor = [UIColor grayColor];

[self.view addSubview:colorLayer];


UIStackView *watchersUI = [[UIStackView alloc]init];
    NSMutableArray *leftArr=[[NSMutableArray alloc]init];
NSMutableArray *rightArr=[[NSMutableArray alloc]init];

NSMutableArray *yearStackUIArr = [[NSMutableArray alloc]initWithObjects:@"year 1", @"year2",@"year3",@"year4",@"year5",nil];
NSMutableArray *monthStackUIArr = [[NSMutableArray alloc]initWithObjects:@"month 1", @"month 2",@"month 3",nil];
NSMutableArray *dayStackUIArr = [[NSMutableArray alloc]initWithObjects:@"day1", @"day2",@"day3",nil];



watchersUI = [[UIStackView alloc] initWithFrame:watchersRect];
watchersUI.axis= UILayoutConstraintAxisHorizontal;
watchersUI.distribution = UIStackViewDistributionFillEqually;
watchersUI.alignment = UIStackViewAlignmentFill;
watchersUI.spacing = 2;
watchersUI.translatesAutoresizingMaskIntoConstraints = YES;

[colorLayer addSubview:watchersUI];


UIView *leftColumn = [[UIView alloc] init];
[leftColumn setBackgroundColor:[UIColor yellowColor]];

UIView *rightColumn = [[UIView alloc]init];
[rightColumn setBackgroundColor:[UIColor redColor]];


[watchersUI addArrangedSubview:leftColumn];
[watchersUI addArrangedSubview:rightColumn];

[leftColumn.leftAnchor constraintEqualToAnchor:watchersUI.leftAnchor].active = YES;
[rightColumn.rightAnchor constraintEqualToAnchor:watchersUI.rightAnchor].active = YES;
[leftColumn.bottomAnchor constraintEqualToAnchor:watchersUI.bottomAnchor].active = YES;
[rightColumn.bottomAnchor constraintEqualToAnchor:watchersUI.bottomAnchor].active = YES;


UIStackView *leftStack =[[UIStackView alloc]init];
leftStack.axis = UILayoutConstraintAxisVertical;
leftStack.distribution = UIStackViewDistributionEqualSpacing;
leftStack.alignment=UIStackViewAlignmentFill;
leftStack.spacing =1;
leftStack.translatesAutoresizingMaskIntoConstraints = NO;

[leftColumn addSubview:leftStack];


UIStackView *rightStack =[[UIStackView alloc]init];
rightStack.axis = UILayoutConstraintAxisVertical;
rightStack.distribution = UIStackViewDistributionFillProportionally;
rightStack.alignment=UIStackViewAlignmentLeading;
rightStack.spacing =2;
rightStack.translatesAutoresizingMaskIntoConstraints = NO;
[rightColumn addSubview:rightStack];






if ([yearStackUIArr count]>0) {
    UIView *yearBox=[[UIView alloc]init];
    yearBox.backgroundColor = [UIColor purpleColor];

    NSLog(@"year leftArr %d",[leftArr count]);
    NSLog(@"year rightArr %d",[rightArr count]);

    if ([rightArr count]<[leftArr count]) {

        [rightStack addArrangedSubview:yearBox];
        [rightArr addObject:yearBox];
        [NSLayoutConstraint constraintWithItem:yearBox attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationLessThanOrEqual toItem:rightStack attribute:NSLayoutAttributeHeight multiplier:1 constant:0].active = YES;
        UILayoutGuide *margin = rightStack.layoutMarginsGuide;
        [yearBox.heightAnchor constraintLessThanOrEqualToAnchor:margin.heightAnchor].active =YES;

        [yearBox.topAnchor constraintEqualToAnchor:rightColumn.topAnchor].active = YES;
        [yearBox.leftAnchor constraintEqualToAnchor:rightColumn.leftAnchor].active = YES;
        [yearBox.rightAnchor constraintEqualToAnchor:rightColumn.rightAnchor].active = YES;



    }
    else if(([rightArr count]==[leftArr count])||([rightArr count]>[leftArr count]))
    {
        [leftStack addArrangedSubview:yearBox];
        [leftArr addObject:yearBox];

        for (UIView *subs in leftStack.subviews) {
            NSLog(@"yearBox leftStack %@",subs);
        }

          [NSLayoutConstraint constraintWithItem:yearBox attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationLessThanOrEqual toItem:leftStack attribute:NSLayoutAttributeHeight multiplier:1 constant:0].active=YES;
        UILayoutGuide *margin = leftStack.layoutMarginsGuide;
        [yearBox.heightAnchor constraintLessThanOrEqualToAnchor:margin.heightAnchor].active = YES;


        [yearBox.topAnchor constraintEqualToAnchor:leftColumn.topAnchor].active = YES;
        [yearBox.leftAnchor constraintEqualToAnchor:leftColumn.leftAnchor].active = YES;
        [yearBox.rightAnchor constraintEqualToAnchor:leftColumn.rightAnchor].active = YES;


    }


    UIStackView *boxStack = [[UIStackView alloc]init];
    boxStack.axis = UILayoutConstraintAxisVertical;
    boxStack.distribution = UIStackViewDistributionFillEqually;
    boxStack.alignment=UIStackViewAlignmentLeading;
    boxStack.spacing=1;
    boxStack.translatesAutoresizingMaskIntoConstraints = NO;
    [yearBox addSubview:boxStack];

    for (NSString *innerItem in yearStackUIArr) {
        UILabel *innerView = [[UILabel alloc]init];
        [boxStack addArrangedSubview:innerView];

        [innerView.leftAnchor constraintEqualToAnchor:yearBox.leftAnchor].active =YES;
        [innerView.rightAnchor constraintEqualToAnchor:yearBox.rightAnchor].active =YES;
        [innerView.heightAnchor constraintGreaterThanOrEqualToConstant:20].active =YES;
        innerView.backgroundColor =[UIColor cyanColor];
        innerView.text = innerItem;
        innerView.font = [UIFont systemFontOfSize:10];


    }

}



if ([monthStackUIArr count]>0) {
    UIView *monthBox=[[UIView alloc]init];
    monthBox.backgroundColor =[UIColor blackColor];


    if ([rightArr count]<[leftArr count]) {
        [rightStack addArrangedSubview:monthBox];
        [rightArr addObject:monthBox];

        [NSLayoutConstraint constraintWithItem:monthBox attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationLessThanOrEqual toItem:rightStack attribute:NSLayoutAttributeHeight multiplier:1 constant:0].active = YES;
        UILayoutGuide *margin = rightStack.layoutMarginsGuide;
        [monthBox.heightAnchor constraintLessThanOrEqualToAnchor:margin.heightAnchor].active =YES;

        [monthBox.leftAnchor constraintEqualToAnchor:rightColumn.leftAnchor].active = YES;
        [monthBox.rightAnchor constraintEqualToAnchor:rightColumn.rightAnchor].active = YES;

    }
    else if(([rightArr count]==[leftArr count])||([rightArr count]>[leftArr count]))
    {
        [leftStack addArrangedSubview:monthBox];
        [leftArr addObject:monthBox];

        [NSLayoutConstraint constraintWithItem:monthBox attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationLessThanOrEqual toItem:leftStack attribute:NSLayoutAttributeHeight multiplier:1 constant:0].active = YES;
        UILayoutGuide *margin = leftStack.layoutMarginsGuide;
        [monthBox.heightAnchor constraintLessThanOrEqualToAnchor:margin.heightAnchor].active =YES;

        [monthBox.leftAnchor constraintEqualToAnchor:leftColumn.leftAnchor].active = YES;
        [monthBox.rightAnchor constraintEqualToAnchor:leftColumn.rightAnchor].active = YES;
    }

    UIStackView *boxStack = [[UIStackView alloc]init];
    boxStack.axis = UILayoutConstraintAxisVertical;
    boxStack.distribution = UIStackViewDistributionFillEqually;
    boxStack.alignment=UIStackViewAlignmentLeading;
    boxStack.spacing=2;
    boxStack.translatesAutoresizingMaskIntoConstraints = NO;
    [monthBox addSubview:boxStack];

    for (NSString *innerItem in monthStackUIArr) {
        UILabel *innerView = [[UILabel alloc]init];
        [boxStack addArrangedSubview:innerView];

        [innerView.leftAnchor constraintEqualToAnchor:monthBox.leftAnchor].active =YES;
        [innerView.rightAnchor constraintEqualToAnchor:monthBox.rightAnchor].active =YES;
        [innerView.heightAnchor constraintGreaterThanOrEqualToConstant:20].active =YES;
        innerView.backgroundColor =[UIColor whiteColor];
        innerView.text = innerItem;
        innerView.font = [UIFont systemFontOfSize:10];

    }



}

if ([dayStackUIArr count]>0) {
    UIView *dayBox=[[UIView alloc]init];
    dayBox.backgroundColor =[UIColor brownColor];


    if ([rightArr count]<[leftArr count]) {

        [rightStack addArrangedSubview:dayBox];
        [rightArr addObject:dayBox];

        [NSLayoutConstraint constraintWithItem:dayBox attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationLessThanOrEqual toItem:rightStack attribute:NSLayoutAttributeHeight multiplier:1 constant:0].active = YES;
        UILayoutGuide *margin = rightStack.layoutMarginsGuide;
        [dayBox.heightAnchor constraintGreaterThanOrEqualToAnchor:margin.heightAnchor].active =YES;

        [dayBox.leftAnchor constraintEqualToAnchor:rightColumn.leftAnchor].active = YES;
        [dayBox.rightAnchor constraintEqualToAnchor:rightColumn.rightAnchor].active = YES;


        if ([rightArr count]>0) {
            UIView *tmpbox = rightArr[[rightArr count]-2];
            [dayBox.topAnchor constraintEqualToAnchor:tmpbox.bottomAnchor].active=YES;
        }


    }
    else if(([rightArr count]==[leftArr count])||([rightArr count]>[leftArr count]))
    {
        [leftStack addArrangedSubview:dayBox];

        [leftArr addObject:dayBox];

         [NSLayoutConstraint constraintWithItem:dayBox attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationLessThanOrEqual toItem:leftStack attribute:NSLayoutAttributeHeight multiplier:1 constant:0].active = YES;
         UILayoutGuide *margin = leftStack.layoutMarginsGuide;
        [dayBox.heightAnchor constraintGreaterThanOrEqualToAnchor:margin.heightAnchor].active =YES;


        [dayBox.leftAnchor constraintEqualToAnchor:leftColumn.leftAnchor].active = YES;
        [dayBox.rightAnchor constraintEqualToAnchor:leftColumn.rightAnchor].active = YES;


    }
    UIStackView *boxStack = [[UIStackView alloc]init];
    boxStack.axis = UILayoutConstraintAxisVertical;
    boxStack.distribution = UIStackViewDistributionFillEqually;
    boxStack.alignment=UIStackViewAlignmentLeading;
    boxStack.spacing=2;
    boxStack.translatesAutoresizingMaskIntoConstraints = NO;
    [dayBox addSubview:boxStack];

    for (NSString *innerItem in dayStackUIArr) {
        UILabel *innerView = [[UILabel alloc]init];
        [boxStack addArrangedSubview:innerView];

        [innerView.leftAnchor constraintEqualToAnchor:dayBox.leftAnchor].active =YES;
        [innerView.rightAnchor constraintEqualToAnchor:dayBox.rightAnchor].active =YES;
        [innerView.heightAnchor constraintGreaterThanOrEqualToConstant:20].active =YES;
        innerView.backgroundColor =[UIColor blueColor];
        innerView.text = innerItem;
        innerView.font = [UIFont systemFontOfSize:10];

    }



}