Swiftgram/submodules/AsyncDisplayKit/docs/_docs/automatic-layout-examples.md

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Three examples in increasing order of complexity. #NSSpain Talk Example

SwiftObjective-C

- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constraint
{
  ASStackLayoutSpec *vStack = [[ASStackLayoutSpec alloc] init];
[vStack setChildren:@[titleNode, bodyNode];
ASStackLayoutSpec *hstack = [[ASStackLayoutSpec alloc] init];
hStack.direction          = ASStackLayoutDirectionHorizontal;
hStack.spacing            = 5.0;
[hStack setChildren:@[imageNode, vStack]];
ASInsetLayoutSpec *insetSpec = [ASInsetLayoutSpec insetLayoutSpecWithInsets:UIEdgeInsetsMake(5,5,5,5) child:hStack];
return insetSpec;
}

###Discussion

#Social App Layout

SwiftObjective-C

- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
{
  // header stack
  _userAvatarImageView.preferredFrameSize = CGSizeMake(USER_IMAGE_HEIGHT, USER_IMAGE_HEIGHT);  // constrain avatar image frame size
ASLayoutSpec *spacer = [[ASLayoutSpec alloc] init];
spacer.flexGrow      = YES;
ASStackLayoutSpec *headerStack = [ASStackLayoutSpec horizontalStackLayoutSpec];
headerStack.alignItems         = ASStackLayoutAlignItemsCenter;       // center items vertically in horizontal stack
headerStack.justifyContent     = ASStackLayoutJustifyContentStart;    // justify content to left side of header stack
headerStack.spacing            = HORIZONTAL_BUFFER;
[headerStack setChildren:@[_userAvatarImageView, _userNameLabel, spacer, _photoTimeIntervalSincePostLabel]];
// header inset stack
UIEdgeInsets insets                = UIEdgeInsetsMake(0, HORIZONTAL_BUFFER, 0, HORIZONTAL_BUFFER);
ASInsetLayoutSpec *headerWithInset = [ASInsetLayoutSpec insetLayoutSpecWithInsets:insets child:headerStack];
headerWithInset.flexShrink = YES;
// vertical stack
CGFloat cellWidth                  = constrainedSize.max.width;
_photoImageView.preferredFrameSize = CGSizeMake(cellWidth, cellWidth);  // constrain photo frame size
ASStackLayoutSpec *verticalStack   = [ASStackLayoutSpec verticalStackLayoutSpec];
verticalStack.alignItems           = ASStackLayoutAlignItemsStretch;    // stretch headerStack to fill horizontal space
[verticalStack setChildren:@[headerWithInset, _photoImageView, footerWithInset]];
return verticalStack;
}

###Discussion

Get the full Texture project at examples/ASDKgram.

#Social App Layout 2

SwiftObjective-C

- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize {
ASLayoutSpec *textSpec  = [self textSpec];
ASLayoutSpec *imageSpec = [self imageSpecWithSize:constrainedSize];
ASOverlayLayoutSpec *soldOutOverImage = [ASOverlayLayoutSpec overlayLayoutSpecWithChild:imageSpec
overlay:[self soldOutLabelSpec]];
NSArray *stackChildren = @[soldOutOverImage, textSpec];
ASStackLayoutSpec *mainStack = [ASStackLayoutSpec stackLayoutSpecWithDirection:ASStackLayoutDirectionVertical
spacing:0.0
justifyContent:ASStackLayoutJustifyContentStart
alignItems:ASStackLayoutAlignItemsStretch

children:stackChildren];
ASOverlayLayoutSpec *soldOutOverlay = [ASOverlayLayoutSpec overlayLayoutSpecWithChild:mainStack
overlay:self.soldOutOverlay];
return soldOutOverlay;
}


(ASLayoutSpec *)textSpec {
CGFloat kInsetHorizontal        = 16.0;
CGFloat kInsetTop               = 6.0;
CGFloat kInsetBottom            = 0.0;
UIEdgeInsets textInsets         = UIEdgeInsetsMake(kInsetTop, kInsetHorizontal, kInsetBottom, kInsetHorizontal);
ASLayoutSpec *verticalSpacer    = [[ASLayoutSpec alloc] init];
verticalSpacer.flexGrow         = YES;
ASLayoutSpec *horizontalSpacer1 = [[ASLayoutSpec alloc] init];
horizontalSpacer1.flexGrow      = YES;
ASLayoutSpec *horizontalSpacer2 = [[ASLayoutSpec alloc] init];
horizontalSpacer2.flexGrow      = YES;
NSArray *info1Children = @[self.firstInfoLabel, self.distanceLabel, horizontalSpacer1, self.originalPriceLabel];
NSArray *info2Children = @[self.secondInfoLabel, horizontalSpacer2, self.finalPriceLabel];
if ([ItemNode isRTL]) {
info1Children = [[info1Children reverseObjectEnumerator] allObjects];
info2Children = [[info2Children reverseObjectEnumerator] allObjects];
}
ASStackLayoutSpec *info1Stack = [ASStackLayoutSpec stackLayoutSpecWithDirection:ASStackLayoutDirectionHorizontal
spacing:1.0
justifyContent:ASStackLayoutJustifyContentStart
alignItems:ASStackLayoutAlignItemsBaselineLast children:info1Children];
ASStackLayoutSpec *info2Stack = [ASStackLayoutSpec stackLayoutSpecWithDirection:ASStackLayoutDirectionHorizontal
spacing:0.0
justifyContent:ASStackLayoutJustifyContentCenter
alignItems:ASStackLayoutAlignItemsBaselineLast children:info2Children];
ASStackLayoutSpec *textStack = [ASStackLayoutSpec stackLayoutSpecWithDirection:ASStackLayoutDirectionVertical
spacing:0.0
justifyContent:ASStackLayoutJustifyContentEnd
alignItems:ASStackLayoutAlignItemsStretch
children:@[self.titleLabel, verticalSpacer, info1Stack, info2Stack]];
ASInsetLayoutSpec *textWrapper = [ASInsetLayoutSpec insetLayoutSpecWithInsets:textInsets
child:textStack];
textWrapper.flexGrow = YES;
return textWrapper;
}


(ASLayoutSpec *)imageSpecWithSize:(ASSizeRange)constrainedSize {
CGFloat imageRatio = [self imageRatioFromSize:constrainedSize.max];
ASRatioLayoutSpec *imagePlace = [ASRatioLayoutSpec ratioLayoutSpecWithRatio:imageRatio child:self.dealImageView];
self.badge.layoutPosition = CGPointMake(0, constrainedSize.max.height - kFixedLabelsAreaHeight - kBadgeHeight);
self.badge.sizeRange = ASRelativeSizeRangeMake(ASRelativeSizeMake(ASRelativeDimensionMakeWithPercent(0), ASRelativeDimensionMakeWithPoints(kBadgeHeight)), ASRelativeSizeMake(ASRelativeDimensionMakeWithPercent(1), ASRelativeDimensionMakeWithPoints(kBadgeHeight)));
ASStaticLayoutSpec *badgePosition = [ASStaticLayoutSpec staticLayoutSpecWithChildren:@[self.badge]];
ASOverlayLayoutSpec *badgeOverImage = [ASOverlayLayoutSpec overlayLayoutSpecWithChild:imagePlace overlay:badgePosition];
badgeOverImage.flexGrow = YES;
return badgeOverImage;
}


(ASLayoutSpec *)soldOutLabelSpec {
ASCenterLayoutSpec *centerSoldOutLabel = [ASCenterLayoutSpec centerLayoutSpecWithCenteringOptions:ASCenterLayoutSpecCenteringXY
sizingOptions:ASCenterLayoutSpecSizingOptionMinimumXY child:self.soldOutLabelFlat];
ASStaticLayoutSpec *soldOutBG = [ASStaticLayoutSpec staticLayoutSpecWithChildren:@[self.soldOutLabelBackground]];
ASCenterLayoutSpec *centerSoldOut = [ASCenterLayoutSpec centerLayoutSpecWithCenteringOptions:ASCenterLayoutSpecCenteringXY   sizingOptions:ASCenterLayoutSpecSizingOptionDefault child:soldOutBG];
ASBackgroundLayoutSpec *soldOutLabelOverBackground = [ASBackgroundLayoutSpec backgroundLayoutSpecWithChild:centerSoldOutLabel background:centerSoldOut];
return soldOutLabelOverBackground;
}

###Discussion

Get the full Texture project at examples/CatDealsCollectionView.