AutoLayout for Views Generated Programmatically

Question

Having two views headerView and footterView. I want the views to be placed one below another. i mean to say headerView on top and footerView below headerView.

UIView *mainview = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
    headerView =  [[[NSBundle mainBundle] loadNibNamed:@"BaseHeader" owner:self options:nil] objectAtIndex:0];
    footterView = [[[NSBundle mainBundle] loadNibNamed:@"BaseFotter" owner:self options:nil] objectAtIndex:0];

 self.view = mainview;
 [mainview  addSubview:headerView];
 [mainview  addSubview:footterView];

I have tried adding constraint as below

NSDictionary *viewsDictionary =
NSDictionaryOfVariableBindings(headerView,footterView);

NSLayoutConstraint *constraint = [[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[headerView]-[footterView]|" options:0 metrics:nil views:viewsDictionary] objectAtIndex:0];

NSLayoutConstraint *mconstraint = [[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[headerView(==footterView)]|" options:0 metrics:nil views:viewsDictionary] objectAtIndex:0];

[mainview addConstraint:constraint];
[mainview addConstraint:mconstraint];

But always the footerView alone is displayed in screen. If i add View in below order , always HeaderView is displayed.

[mainview  addSubview:footterView];
[mainview  addSubview:headerView];

AutoLayout is checked in both xib (BaseHeader.xib & BaseFotter.xib ). do i need to do any more in xib?

You need to set some horizontal constraints and/or a width (for one of the views) to make the constraints unambiguous. — rdelmar
– rdelmar, Commented Nov 16, 2013 at 6:18
Also, why are you using objectAtIndex:0 in your constraintsWithVisualFormat lines? That method creates an array of constraints, that you want to add to your view. Why are you adding just the first one? — rdelmar
– rdelmar, Commented Nov 16, 2013 at 6:32
ya. I should have added all constraints. i am adding array of constraints. — Sowmia Sundararajan
– Sowmia Sundararajan, Commented Nov 16, 2013 at 7:05

Niraj · Accepted Answer · 2014-02-18 15:54:04Z

1

Change your constraints adding code to:

NSArray *constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[headerView]-[footterView]|" options:0 metrics:nil views:viewsDictionary];

NSArray *mconstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[headerView(==footterView)]|" options:0 metrics:nil views:viewsDictionary];

[mainview addConstraints: constraints]; [mainview addConstraints:mconstraints];

answered Feb 18, 2014 at 15:54

Niraj

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