[scrollView addSubview:label1];
    [scrollView addSubview:button1];
    [scrollView addSubview:button2];
    [scrollView addSubview:button3];
    [scrollView addSubview:button4];
    [scrollView addSubview:button5];
    [scrollView addSubview:button6];
    [scrollView addSubview:button7];
    [scrollView addSubview:button8];
    [container addSubview:scrollView];
    [[self view] addSubview:container];
    [[self view] addSubview:_delegateOutputTextView];


    // constraints
   // All the views have their translatesAutoresizingMaskIntoConstraints = false;
    NSArray *hScrollViewLayoutConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0.0-[scrollView]-0.0-|" options:0 metrics:nil views:viewsDictionary];
    NSArray *vScrollViewLayoutConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[scrollView]-0-|" options:0 metrics:nil views:viewsDictionary];
    [container addConstraints:hScrollViewLayoutConstraints];
    [container addConstraints:vScrollViewLayoutConstraints];
    
    
    NSArray *hContainerLayoutConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0.0-[container]-0.0-|" options:0 metrics:nil views:viewsDictionary];
    NSArray *hTextViewLayoutConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[_delegateOutputTextView]-0-|" options:0 metrics:nil views:viewsDictionary];
    
    NSArray *vContainerLayoutConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[container]-0-[_delegateOutputTextView]" options:0 metrics:nil views:viewsDictionary];
    NSArray *vTextViewLayoutConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-<=500-[_delegateOutputTextView(150)]-0-|" options:0 metrics:nil views:viewsDictionary];
    
    [[self view] addConstraints:hContainerLayoutConstraints];
    [[self view] addConstraints:hTextViewLayoutConstraints];
    [[self view] addConstraints:vContainerLayoutConstraints];
    [[self view] addConstraints:vTextViewLayoutConstraints];


    NSArray *vScrollViewOtherLayoutConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-40-[label1]-20-[button1]-20-[button2]-20-[button3]-20-[button4]-20-[button5]-20-[button6]-20-[button7]-20-[button8]-20-|" options:0 metrics:nil views:viewsDictionary];
    [scrollView addConstraints:vScrollViewOtherLayoutConstraints];

NSLayoutConstraint *hlabel1LayoutConstraints = [NSLayoutConstraint constraintWithItem:label1
    attribute:NSLayoutAttributeCenterX
    relatedBy:NSLayoutRelationEqual
    toItem:label1.superview
    attribute:NSLayoutAttributeCenterX
    multiplier:1.f constant:0.f];
[scrollView addConstraint:hlabel1LayoutConstraints];


NSLayoutConstraint *hbutton1LayoutConstraints = [NSLayoutConstraint constraintWithItem:button1
    attribute:NSLayoutAttributeCenterX
    relatedBy:NSLayoutRelationEqual
    toItem:button1.superview
    attribute:NSLayoutAttributeCenterX
    multiplier:1.f constant:0.f];

NSLayoutConstraint *button1WidthConstraints = [NSLayoutConstraint constraintWithItem:button1
    attribute:NSLayoutAttributeWidth
    relatedBy:NSLayoutRelationEqual
    toItem:nil
    attribute:NSLayoutAttributeNotAnAttribute
    multiplier:1.f constant:250.0f];

[scrollView addConstraint:button1WidthConstraints];
[scrollView addConstraint:hbutton1LayoutConstraints];


NSLayoutConstraint *hbutton2LayoutConstraints = [NSLayoutConstraint constraintWithItem:button2
    attribute:NSLayoutAttributeCenterX
    relatedBy:NSLayoutRelationEqual
    toItem:button2.superview
    attribute:NSLayoutAttributeCenterX
    multiplier:1.f constant:0.f];

NSLayoutConstraint *button2WidthConstraints = [NSLayoutConstraint constraintWithItem:button2
    attribute:NSLayoutAttributeWidth
    relatedBy:NSLayoutRelationEqual
    toItem:nil
    attribute:NSLayoutAttributeNotAnAttribute
    multiplier:1.f constant:250.0f];

[scrollView addConstraint:button2WidthConstraints];
[scrollView addConstraint:hbutton2LayoutConstraints];



NSLayoutConstraint *hbutton3LayoutConstraints = [NSLayoutConstraint constraintWithItem:button3
    attribute:NSLayoutAttributeCenterX
    relatedBy:NSLayoutRelationEqual
    toItem:button3.superview
    attribute:NSLayoutAttributeCenterX
    multiplier:1.f constant:0.f];

NSLayoutConstraint *button3WidthConstraints = [NSLayoutConstraint constraintWithItem:button3
    attribute:NSLayoutAttributeWidth
    relatedBy:NSLayoutRelationEqual
    toItem:nil
    attribute:NSLayoutAttributeNotAnAttribute
    multiplier:1.f constant:250.0f];

[scrollView addConstraint:button3WidthConstraints];
[scrollView addConstraint:hbutton3LayoutConstraints];



NSLayoutConstraint *hbutton4LayoutConstraints = [NSLayoutConstraint constraintWithItem:button4
    attribute:NSLayoutAttributeCenterX
    relatedBy:NSLayoutRelationEqual
    toItem:button4.superview
    attribute:NSLayoutAttributeCenterX
    multiplier:1.f constant:0.f];

NSLayoutConstraint *button4WidthConstraints = [NSLayoutConstraint constraintWithItem:button4
    attribute:NSLayoutAttributeWidth
    relatedBy:NSLayoutRelationEqual
    toItem:nil
    attribute:NSLayoutAttributeNotAnAttribute
    multiplier:1.f constant:250.0f];

[scrollView addConstraint:button4WidthConstraints];
[scrollView addConstraint:hbutton4LayoutConstraints];



NSLayoutConstraint *hbutton5LayoutConstraints = [NSLayoutConstraint constraintWithItem:button5
    attribute:NSLayoutAttributeCenterX
    relatedBy:NSLayoutRelationEqual
    toItem:button5.superview
    attribute:NSLayoutAttributeCenterX
    multiplier:1.f constant:0.f];

NSLayoutConstraint *button5WidthConstraints = [NSLayoutConstraint constraintWithItem:button5
    attribute:NSLayoutAttributeWidth
    relatedBy:NSLayoutRelationEqual
    toItem:nil
    attribute:NSLayoutAttributeNotAnAttribute
    multiplier:1.f constant:250.0f];

[scrollView addConstraint:button5WidthConstraints];
[scrollView addConstraint:hbutton5LayoutConstraints];



NSLayoutConstraint *hbutton6LayoutConstraints = [NSLayoutConstraint constraintWithItem:button6
    attribute:NSLayoutAttributeCenterX
    relatedBy:NSLayoutRelationEqual
    toItem:button6.superview
    attribute:NSLayoutAttributeCenterX
    multiplier:1.f constant:0.f];

NSLayoutConstraint *button6WidthConstraints = [NSLayoutConstraint constraintWithItem:button6
    attribute:NSLayoutAttributeWidth
    relatedBy:NSLayoutRelationEqual
    toItem:nil
    attribute:NSLayoutAttributeNotAnAttribute
    multiplier:1.f constant:250.0f];

[scrollView addConstraint:button6WidthConstraints];
[scrollView addConstraint:hbutton6LayoutConstraints];



NSLayoutConstraint *hbutton7LayoutConstraints = [NSLayoutConstraint constraintWithItem:button7
    attribute:NSLayoutAttributeCenterX
    relatedBy:NSLayoutRelationEqual
    toItem:button7.superview
    attribute:NSLayoutAttributeCenterX
    multiplier:1.f constant:0.f];

NSLayoutConstraint *button7WidthConstraints = [NSLayoutConstraint constraintWithItem:button7
    attribute:NSLayoutAttributeWidth
    relatedBy:NSLayoutRelationEqual
    toItem:nil
    attribute:NSLayoutAttributeNotAnAttribute
    multiplier:1.f constant:250.0f];

[scrollView addConstraint:button7WidthConstraints];
[scrollView addConstraint:hbutton7LayoutConstraints];



NSLayoutConstraint *hbutton8LayoutConstraints = [NSLayoutConstraint constraintWithItem:button8
    attribute:NSLayoutAttributeCenterX
    relatedBy:NSLayoutRelationEqual
    toItem:button8.superview
    attribute:NSLayoutAttributeCenterX
    multiplier:1.f constant:0.f];

NSLayoutConstraint *button8WidthConstraints = [NSLayoutConstraint constraintWithItem:button8
    attribute:NSLayoutAttributeWidth
    relatedBy:NSLayoutRelationEqual
    toItem:nil
    attribute:NSLayoutAttributeNotAnAttribute
    multiplier:1.f constant:250.0f];

[scrollView addConstraint:button8WidthConstraints];
[scrollView addConstraint:hbutton8LayoutConstraints];```