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preheat

Introduction

Welcome to the documentation for Preheat, a Swift library for preheating UICollectionView cells. This library is designed to improve the performance of UICollectionViews, specifically when scrolling through a large number of cells. By preheating cells, you can ensure that they are ready to be displayed when the user scrolls to them, reducing any noticeable delay or jitter during scrolling.

Features

Preheat offers the following features:

  • Preloading: Preheat automatically manages the preloading of cells based on their position in the scroll view.
  • Efficiency: Cells are preloaded in batches during scrolling, ensuring optimal memory usage and smooth user experience.
  • Customizable: Preheat allows you to specify the number of cells to preload, as well as the direction and distance from the visible area.
  • Delegate: The library provides a delegate to receive updates about preheat events, allowing you to react to these events in your code.

Installation

To install Preheat in your project, you can use a package manager such as CocoaPods or Swift Package Manager.

CocoaPods

To install Preheat using CocoaPods, add the following line to your Podfile:

# For latest release
pod 'Preheat'

# For a specific version
pod 'Preheat', '~> 1.0.0'

Then, run pod install in your project directory.

Swift Package Manager

To install Preheat using Swift Package Manager, add the library as a dependency in your Package.swift file:

dependencies: [
    .package(url: "https://github.com/example/preheat.git", from: "1.0.0")
]

Then, run swift build or use your preferred tool to build the project that depends on Preheat.

Getting Started

To get started with Preheat, follow these steps:

1. Import Preheat

In your Swift file, import the Preheat module:

import Preheat

2. Initialize PreheatManager

Create an instance of PreheatManager, which manages the preheating functionality:

let preheatManager = PreheatManager()

3. Implement PreheatDelegate

Conform your view controller to the PreheatDelegate protocol to receive updates about preheat events:

class MyViewController: UIViewController, PreheatDelegate {
    // ...
}

4. Register Delegate

In your view controller, register the delegate to receive preheat events:

override func viewDidLoad() {
    super.viewDidLoad()
    preheatManager.delegate = self
}

5. Preheat Configuration

Configure the preheat settings by setting the desired number of preloaded cells, direction, and distance:

preheatManager.numberOfPreloadItems = 5
preheatManager.preloadDirection = .vertical
preheatManager.preloadDistance = 400

6. Preheat Cells

Call the preheatCells(in: CGRect) method in your scroll view delegate method to trigger preheating of cells:

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    preheatManager.preheatCells(in: scrollView.bounds)
}

7. React to Preheat Events

Implement the delegate method preheatManager(_ manager: PreheatManager, didUpdatePreheatRect preheatRect: CGRect) to react to preheat events:

func preheatManager(_ manager: PreheatManager, didUpdatePreheatRect preheatRect: CGRect) {
    // Handle preheat events, e.g., updating data or triggering preloading of cells
}

Conclusion

Congratulations! You have successfully integrated Preheat into your project. By preheating UICollectionView cells, you can provide a smoother scrolling experience to your users, minimizing any lag or delay in displaying content. Refer to the Preheat API documentation for additional customization options and advanced features.