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I've just started trying my hands on AutoLayout and don't quite get it.

Can anyone please show me how exactly to programmatically pin a view to its superview such that the space between the edges of the view and the edges of the superview is 0. (Essentially, I want the view to still cover the screen when in landscape)

Thanks

in the end, this was how I solved it: (vc.view is the child view and self.view is the parent)

    /* pin Left of child to left of parent */
    [self.view addConstraint:[NSLayoutConstraint constraintWithItem:vc.view
                                                          attribute:NSLayoutAttributeLeft
                                                          relatedBy:NSLayoutRelationEqual
                                                             toItem:self.view
                                                          attribute:NSLayoutAttributeLeft
                                                         multiplier:1.0
                                                           constant:0]];

    /* pin Right of child to right of parent */
    [self.view addConstraint:[NSLayoutConstraint constraintWithItem:vc.view
                                                          attribute:NSLayoutAttributeRight
                                                          relatedBy:NSLayoutRelationEqual
                                                             toItem:self.view
                                                          attribute:NSLayoutAttributeRight
                                                         multiplier:1.0
                                                           constant:0]];

    /* pin top of child to bottom of nav bar(or status bar if no nav bar) */
    [self.view addConstraint:[NSLayoutConstraint constraintWithItem:vc.view
                                                          attribute:NSLayoutAttributeTop
                                                          relatedBy:NSLayoutRelationEqual
                                                             toItem:self.topLayoutGuide
                                                          attribute:NSLayoutAttributeBottom
                                                         multiplier:1.0
                                                           constant:0]];

    /* pin Top of nav bar to bottom of child view */
    [self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.bottomLayoutGuide
                                                          attribute:NSLayoutAttributeTop
                                                          relatedBy:NSLayoutRelationEqual
                                                             toItem:vc.view
                                                          attribute:NSLayoutAttributeBottom
                                                         multiplier:1.0
                                                           constant:0]];
share|improve this question
    
I think this should help. stackoverflow.com/questions/8156799/… –  mithlesh jha May 14 at 4:35
    
Thanks, this helped –  SasukeIsCool May 14 at 5:15

1 Answer 1

up vote 0 down vote

I think you should create forexample two constraints: to the left edge with value = 0 and right edge with value = 0. Also you can create constrains to the left edge and width = parent width.

[NSLayoutConstraint constraintWithItem:child_view attribute:NSLayoutAttributeWidth
                  relatedBy:NSLayoutRelationEqual toItem:parent_view
                  attribute:NSLayoutAttributeWidth multiplier:1.0 constant:0.0];
share|improve this answer
    
Do you think it would work by adding 2 constraints to the sub_view for width and height(instead of left edge) and doing the whole "relatedBy:NSLayoutRelationEqual multiplier:1.0" thing for both constraints? –  SasukeIsCool May 14 at 4:23
    
Actually please ignore my first comment, how would you specify a constraint for an edge? –  SasukeIsCool May 14 at 4:29
    
My solution = your solution, but i offered to set left = left, top = top, width = width, height = height. –  valbuev May 14 at 6:18
    
Oh my bad. I thought you meant to add just 2, just left and width –  SasukeIsCool May 14 at 6:39

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