LMFeedView

Overview

The LMFeedView is a customizable view widget that extends UIView with additional functionality for styling, layout, and lifecycle management. It provides convenient methods for configuring appearance, managing constraints, and implementing a structured view lifecycle pattern.

File Location:
LMFeedView.swift

Functionality

UI Components

• layer: The view's layer for shadow and corner radius customization
• subviews: The view's subviews for hierarchical layout management
• safeAreaLayoutGuide: The view's safe area layout guide for safe area constraints

Methods

• init(frame:): Initializes the view with a frame and sets up the lifecycle
• translatesAutoresizingMaskIntoConstraints() -> Self: Disables autoresizing mask translation and returns self for chaining
• roundCorners(_:with:): Rounds specified corners with a given corner radius
• dropShadow(scale:): Applies a default shadow with customizable scale
• dropShadow(color:opacity:offSet:radius:scale:): Applies a custom shadow with full parameter control
• pinSubView(subView:padding:): Pins a subview to the view's edges with optional padding
• safePinSubView(subView:padding:): Pins a subview to the view's safe area with optional padding
• addConstraint(top:bottom:leading:trailing:centerX:centerY:): Adds constraints with optional parameters for flexible layout
• setHeightConstraint(with:relatedBy:priority:): Sets height constraint with value or anchor
• setWidthConstraint(with:relatedBy:priority:): Sets width constraint with value or anchor

Lifecycle Methods

• setupViews(): Override to set up subviews
• setupLayouts(): Override to set up auto layout constraints
• setupAppearance(): Override to configure visual appearance
• setupActions(): Override to set up user interactions
• setupObservers(): Override to set up observers and notifications

Customization

CustomFeedView.swift

class CustomFeedView: LMFeedView {
    private let titleLabel = UILabel()
    private let iconImageView = UIImageView()
    
    override func setupViews() {
        addSubview(titleLabel)
        addSubview(iconImageView)
    }
    
    override func setupLayouts() {
        titleLabel.translatesAutoresizingMaskIntoConstraints = false
        iconImageView.translatesAutoresizingMaskIntoConstraints = false
        
        NSLayoutConstraint.activate([
            iconImageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 16),
            iconImageView.centerYAnchor.constraint(equalTo: centerYAnchor),
            iconImageView.widthAnchor.constraint(equalToConstant: 24),
            iconImageView.heightAnchor.constraint(equalToConstant: 24),
            
            titleLabel.leadingAnchor.constraint(equalTo: iconImageView.trailingAnchor, constant: 12),
            titleLabel.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -16),
            titleLabel.topAnchor.constraint(equalTo: topAnchor, constant: 12),
            titleLabel.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -12)
        ])
    }
    
    override func setupAppearance() {
        backgroundColor = .systemBackground
        roundCorners(with: 8)
        dropShadow(color: .black, opacity: 0.1, offSet: CGSize(width: 0, height: 2), radius: 4)
    }
    
    override func setupActions() {
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTap))
        addGestureRecognizer(tapGesture)
    }
    
    @objc private func handleTap() {
        // Handle tap action
    }
}

AppDelegate.swift

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    LMUIComponents.shared.view = CustomFeedView.self
    // ...
    return true
}