How to cache images with Moa in iOS?

Configure cache settings via `Moa.settings.cache`, such as setting `requestCachePolicy` to `.returnCacheDataElseLoad` for persistent storage. You can also customize the disk path for shared caching across the app.

Moa vs Kingfisher: which should I use?

Moa is lighter and simpler for basic image loading in UIKit/AppKit, while Kingfisher offers more features like advanced caching, SwiftUI support, and a larger ecosystem. Choose Moa for minimalism or Kingfisher for comprehensive needs.

How to handle download errors with Moa?

Set an error image using `imageView.moa.errorImage` or a global `Moa.errorImage`, and use `onError` closures for custom logic. The library logs errors for debugging with built-in or custom loggers.

Can I use Moa with SwiftUI?

Not natively; Moa is designed for UIKit/AppKit. You'd need to wrap it in a UIViewRepresentable for iOS or create a custom SwiftUI view, which adds complexity compared to libraries with direct SwiftUI support.

Is Moa still maintained for latest Swift versions?

The README lists support for Swift Package Manager and legacy Swift versions, but check the GitHub repository for recent activity, as it may have slower updates than more popular alternatives.

How to set a placeholder image while loading with Moa?

Assign a placeholder directly to `imageView.image` before setting `moa.url`, as shown in the documentation. The placeholder will be replaced automatically when the network image downloads.

Open-Awesome

Moa

MITSwift

A Swift image downloader library for iOS, tvOS, and macOS that simplifies asynchronous image loading in image views.

GitHub

334 stars43 forks0 contributors

What is Moa?

Moa is a Swift library for downloading and displaying images asynchronously in iOS, tvOS, and macOS apps. It solves the problem of handling network requests, caching, and image loading with a simple API, allowing developers to set an image URL directly on an image view. The library manages background downloads, error handling, and caching automatically.

Target Audience

iOS, tvOS, and macOS developers who need a lightweight, easy-to-integrate solution for loading remote images in their user interfaces, particularly those using UIKit or AppKit.

Value Proposition

Developers choose Moa for its straightforward API, built-in caching and logging, and support for unit testing with simulated network responses, making it a reliable alternative to more complex image loading libraries.

Overview

An image download extension of the image view written in Swift for iOS, tvOS and macOS.

Use Cases

Best For

Loading remote images into UIImageView with minimal code
Implementing image caching with customizable policies
Handling image download errors and displaying fallback images
Unit testing image loading without real network requests
Debugging network issues with built-in logging
Supporting multiple Apple platforms (iOS, tvOS, macOS) with one library

Not Ideal For

SwiftUI-based projects preferring native AsyncImage or more integrated solutions
Apps requiring advanced image transformations (e.g., blurring, cropping) without writing custom manipulation code
Teams needing extensive community support or frequent updates compared to larger libraries like Kingfisher
High-performance applications demanding fine-grained control over memory management and cache invalidation

Pros & Cons

Pros

Minimalist API

Reduces boilerplate with a single-line setup: setting `imageView.moa.url` automatically handles download, caching, and display, as shown in the basic usage example.

Built-in Testing Support

Includes MoaSimulator for faking network responses in unit tests, allowing developers to isolate image loading logic without real HTTP requests, as documented in the unit testing section.

Configurable Caching

Leverages URLSession's cache with customizable policies and disk paths, enabling both protocol-based and forced caching strategies via `Moa.settings.cache`.

Cross-Platform Consistency

Supports iOS, tvOS, and macOS with the same codebase, providing a unified solution for Apple ecosystem apps, as noted in the platform badges and setup instructions.

Cons

URLSession Bug Workaround

Admits to a 'strange URLSession bug' requiring periodic calls to `MoaHttpSession.clearSession()`, adding maintenance overhead and potential instability.

Limited Image Processing

Only offers basic image manipulation via success closures; lacks built-in features for resizing, filters, or animated image support, forcing custom implementation.

UIKit/AppKit Focus

Designed primarily for UIImageView and AppKit, with no native SwiftUI integration, making it cumbersome for modern Apple development without wrappers.

Frequently Asked Questions

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