TextureGram Header Node

HeaderNode.swift

import AsyncDisplayKit
 
class HeaderNode: ASDisplayNode {
    // MARK: - Values
    
    private let post: Post
    
    // MARK: - Nodes
    
    private let profilePicture: ASImageNode
    private let profileName: ASTextNode
    private let postLocation: ASTextNode?
    
    init(post: Post) {
        self.post = post
        
        profilePicture = ASImageNode()
        profilePicture.image = post.user.userPhoto
        profilePicture.style.preferredSize = CGSize(width: 32, height: 32)
        profilePicture.cornerRadius = 32/2
        
        profileName = ASTextNode()
        profileName.attributedText = NSAttributedString.bold(post.user.username)
        
        if let location = post.location {
            postLocation = ASTextNode()
            postLocation?.attributedText = NSAttributedString.subtitle(location)
        }else{
            postLocation = nil
        }
        
        super.init()
        
        self.automaticallyManagesSubnodes = true
    }
    
    override func layoutSpecThatFits(_ constrainedSize: ASSizeRange) -> ASLayoutSpec {
        var leftStackComponents = [ASLayoutElement]()
        leftStackComponents.append(profileName)
        
        if let postLocation = self.postLocation {
            leftStackComponents.append(postLocation)
        }
        
        let leftStack = ASStackLayoutSpec(direction: .vertical,
                                          spacing: 0,
                                          justifyContent: .start,
                                          alignItems: .start,
                                          children: leftStackComponents)
        
        let mainStack = ASStackLayoutSpec(direction: .horizontal,
                                          spacing: 6,
                                          justifyContent: .start,
                                          alignItems: .center,
                                          children: [profilePicture, leftStack])
        
        let padding = ASInsetLayoutSpec(insets: UIEdgeInsets(top: 8, left: 8, bottom: 4, right: 8), child: mainStack)
        
        return padding
    }
}