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Layout Examples

Check out the layout specs example project to play around with the code below.

Simple Header with Left and Right Justified Text

To create this layout, we will use a:

The diagram below shows the composition of the layout elements (nodes + layout specs).

Swift Objective-C
- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
{
  // when the username / location text is too long, 
  // shrink the stack to fit onscreen rather than push content to the right, offscreen
  ASStackLayoutSpec *nameLocationStack = [ASStackLayoutSpec verticalStackLayoutSpec];
  nameLocationStack.style.flexShrink = 1.0;
  nameLocationStack.style.flexGrow = 1.0;
  
  // if fetching post location data from server, 
  // check if it is available yet and include it if so
  if (_postLocationNode.attributedText) {
    nameLocationStack.children = @[_usernameNode, _postLocationNode];
  } else {
    nameLocationStack.children = @[_usernameNode];
  }
  
  // horizontal stack
  ASStackLayoutSpec *headerStackSpec = [ASStackLayoutSpec stackLayoutSpecWithDirection:ASStackLayoutDirectionHorizontal
                                                                               spacing:40
                                                                        justifyContent:ASStackLayoutJustifyContentStart
                                                                            alignItems:ASStackLayoutAlignItemsCenter
                                                                              children:@[nameLocationStack, _postTimeNode]];
  
  // inset the horizontal stack
  return [ASInsetLayoutSpec insetLayoutSpecWithInsets:UIEdgeInsetsMake(0, 10, 0, 10) child:headerStackSpec];
}
  

Rotate the example project from portrait to landscape to see how the spacer grows and shrinks.

Photo with Inset Text Overlay

To create this layout, we will use a:

Swift Objective-C
- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
{
  _photoNode.style.preferredSize = CGSizeMake(USER_IMAGE_HEIGHT*2, USER_IMAGE_HEIGHT*2);

  // INIFINITY is used to make the inset unbounded
  UIEdgeInsets insets = UIEdgeInsetsMake(INFINITY, 12, 12, 12);
  ASInsetLayoutSpec *textInsetSpec = [ASInsetLayoutSpec insetLayoutSpecWithInsets:insets child:_titleNode];
  
  return [ASOverlayLayoutSpec overlayLayoutSpecWithChild:_photoNode overlay:textInsetSpec];
}
  

Photo with Outset Icon Overlay

To create this layout, we will use a:

Swift Objective-C
- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
{
  _iconNode.style.preferredSize = CGSizeMake(40, 40);
  _iconNode.style.layoutPosition = CGPointMake(150, 0);
  
  _photoNode.style.preferredSize = CGSizeMake(150, 150);
  _photoNode.style.layoutPosition = CGPointMake(40 / 2.0, 40 / 2.0);
  
  return [ASAbsoluteLayoutSpec absoluteLayoutSpecWithSizing:ASAbsoluteLayoutSpecSizingSizeToFit
                                                   children:@[_photoNode, _iconNode]];
}
  

Simple Inset Text Cell

To recreate the layout of a single cell as is used in Pinterest’s search view above, we will use a:

Swift Objective-C
- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
{
    UIEdgeInsets insets = UIEdgeInsetsMake(0, 12, 4, 4);
    ASInsetLayoutSpec *inset = [ASInsetLayoutSpec insetLayoutSpecWithInsets:insets
                                                                      child:_titleNode];

    return [ASCenterLayoutSpec centerLayoutSpecWithCenteringOptions:ASCenterLayoutSpecCenteringY
                                                      sizingOptions:ASCenterLayoutSpecSizingOptionMinimumX
                                                              child:inset];
}
  

Top and Bottom Separator Lines

To create the layout above, we will use a:

The diagram below shows the composition of the layoutables (layout specs + nodes).

The following code can also be found in the ASLayoutSpecPlayground example project.

Swift Objective-C
- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
{
  _topSeparator.style.flexGrow = 1.0;
  _bottomSeparator.style.flexGrow = 1.0;

  ASInsetLayoutSpec *insetContentSpec = [ASInsetLayoutSpec insetLayoutSpecWithInsets:UIEdgeInsetsMake(20, 20, 20, 20) child:_textNode];

  return [ASStackLayoutSpec stackLayoutSpecWithDirection:ASStackLayoutDirectionVertical
                                                 spacing:0
                                          justifyContent:ASStackLayoutJustifyContentCenter
                                              alignItems:ASStackLayoutAlignItemsStretch
                                                children:@[_topSeparator, insetContentSpec, _bottomSeparator]];
}
  

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