Ah, I forgot to add constraints to establish the origin.
Got it. Thanks,
-Luther
On Sat, Jul 26, 2014 at 10:44 AM, Luther Baker <lutherba...@gmail.com>
wrote:
> In the following example, I'm displaying a child view in a container view
> attached to a view controller's view property ... on a Retina iPhone
> simulator.
>
> EXPECTED: The VFL constraints cause the child to fill the screen whereas
>
> UNEXPECTED: the programmatic constraints cause the child to fill exactly
> 1/4 of the screen (1/2 width, 1/2 height). The programmatic constraints
> work if I set the multiplier=2.0 on each of those constraints.
>
> I normally don't use width / height constraints this way but I'm surprised
> by the outcome. Is this a Retina pixels/points thing or am I doing
> something wrong?
>
> Thanks,
> -Luther
>
>
> //
> // 1. Fill the parent view with a simple, yellow container
> //
> _containerView = [[UIView alloc] init];
> _containerView.backgroundColor = [UIColor yellowColor];
> _containerView.translatesAutoresizingMaskIntoConstraints = NO;
> [self.view addSubview:_containerView];
>
> NSArray *cc = [NSLayoutConstraint constraintsWithVisualFormat:@
> "V:|[container]|"
>
> options:NSLayoutFormatAlignAllCenterX
> metrics:nil
> views:@{
> @"container" : _containerView }];
> [self.view addConstraints:cc];
> cc = [NSLayoutConstraint constraintsWithVisualFormat:@
> "H:|[container]|"
>
> options:NSLayoutFormatAlignAllCenterY
> metrics:nil
> views:@{ @"container"
> : _containerView }];
> [self.view addConstraints:cc];
>
> //
> // 2. Add a red child to the aforementioned container view
> //
>
> UIView *childView = [[UIView alloc] init];
> childView.backgroundColor = [UIColor redColor];
> childView.translatesAutoresizingMaskIntoConstraints = NO;
> [_containerView addSubview:childView];
>
> // WORKS AS EXPECTED
>
> cc = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[child]|"
>
> options:NSLayoutFormatAlignAllCenterX
> metrics:nil
> views:@{
> @"child" : childView }];
> [_containerView addConstraints:cc];
> cc = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[child]|"
>
> options:NSLayoutFormatAlignAllCenterY
> metrics:nil
> views:@{ @"child" :
> childView }];
> [_containerView addConstraints:cc];
>
> //
> // now, replace the VFL from above with this and the child view only fills
> 1/4 of the screen
> //
>
> NSLayoutConstraint *c = [NSLayoutConstraint
> constraintWithItem:childView
>
> attribute:NSLayoutAttributeWidth
>
> relatedBy:NSLayoutRelationEqual
>
> toItem:_containerView
>
> attribute:NSLayoutAttributeWidth
> multiplier:1.0
> constant:0.0];
> [_containerView addConstraint:c];
>
> c = [NSLayoutConstraint constraintWithItem:childView
> attribute:NSLayoutAttributeHeight
> relatedBy:NSLayoutRelationEqual
> toItem:_containerView
> attribute:NSLayoutAttributeHeight
> multiplier:1.0
> constant:0.0];
> [_containerView addConstraint:c];
>
>
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