SDWebImageSwiftUI

What's for

SDWebImageSwiftUI is a SwiftUI image loading framework, which based on SDWebImage.

It brings all your favorite features from SDWebImage, like async image loading, memory/disk caching, animated image playback and performances.

Besides all these features, we do optimization for SwiftUI, like Binding, View Modifier, using the same design pattern to become a good SwiftUI citizen.

Note we do not guarantee the public API stable for current status until v1.0 version. Since SwiftUI is a new platform for us. This framework is under development, feature requests, contributions, and GitHub stars are welcomed.

Requirements

• Xcode 11+
• iOS 13+
• macOS 10.15+
• tvOS 13+
• watchOS 6+
• Swift 5.1+

Installation

CocoaPods

SDWebImageSwiftUI is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'SDWebImageSwiftUI'

Carthage

SDWebImageSwiftUI is available through Carthage.

github "SDWebImage/SDWebImageSwiftUI"

Swift Package Manager

SDWebImageSwiftUI is available through Swift Package Manager.

let package = Package(
    dependencies: [
        .package(url: "https://github.com/SDWebImage/SDWebImageSwiftUI.git", from: "0.6")
    ],
)

Usage

Using WebImage to load network image

• Supports placeholder and detail options control for image loading as SDWebImage
• Supports success/failure/progress changes event for custom handling
• Supports indicator with activity/progress indicator and customization
• Supports built-in animation and transition, powered by SwiftUI

Note: This WebImage using Image for internal implementation, which is the best compatible for SwiftUI layout and animation system. But it supports static image format only, because unlike UIImageView in UIKit, SwiftUI's Image does not support animation.

var body: some View {
    WebImage(url: URL(string: "https://nokiatech.github.io/heif/content/images/ski_jump_1440x960.heic"))
        .onSuccess { image, cacheType in
            // Success
        }
        .resizable()
        .indicator(.activity) // Activity Indicator
        .animation(.easeInOut(duration: 0.5))
        .transition(.fade) // Fade Transition
        .scaledToFit()
        .frame(width: 300, height: 300, alignment: .center)
}

Using AnimatedImage to play animation

var body: some View {
    Group {
        // Network
        AnimatedImage(url: URL(string: "https://raw.githubusercontent.com/liyong03/YLGIFImage/master/YLGIFImageDemo/YLGIFImageDemo/joy.gif"))
        .onFailure { error in
            // Error
        }
        .indicator(SDWebImageActivityIndicator.medium) // Activity Indicator
        .transition(.fade) // Fade Transition
        .scaledToFit()
        // Data
        AnimatedImage(data: try! Data(contentsOf: URL(fileURLWithPath: "/tmp/foo.webp")))
        .customLoopCount(1)
        // Bundle (not Asset Catalog)
        AnimatedImage(name: "animation1", isAnimating: $isAnimating)) // Animation control binding
        .maxBufferSize(.max)
    }
}

• Supports network image as well as local data and bundle image
• Supports animation control using the SwiftUI Binding
• Supports indicator and transition, powered by SDWebImage and Core Animation
• Supports advanced control like loop count, incremental load, buffer size
• Supports coordinate with native UIKit/AppKit/WatchKit view

Note: AnimatedImage supports both image url or image data for animated image format. Which use the SDWebImage's Animated ImageView for internal implementation. Pay attention that since this base on UIKit/AppKit representable, some advanced SwiftUI layout and animation system may not work as expected. You may need UIKit/AppKit and Core Animation to modify the native view.

Note: From v0.4.0, AnimatedImage supports watchOS as well. However, it's not backed by SDWebImage's Animated ImageView like iOS/tvOS/macOS. It use some tricks and hacks because of the limitation on current Apple's API. It also use Image/IO decoding system, which means it supports GIF and APNG format only, but not external format like WebP.

Demo

To run the example using SwiftUI, following the steps:

cd Example
pod install

Then open the Xcode Workspace to run the demo application.

Since SwiftUI is aimed to support all Apple platforms, our demo does this as well, one codebase including:

• iOS (iPhone/iPad/Mac Catalyst)
• macOS
• tvOS
• watchOS

Tips:

1. Use Switch (right-click on macOS) to switch between WebImage and AnimatedImage.
2. Use Reload (right-click on macOS/force press on watchOS) to clear cache.
3. Use Swipe to delete one image item.

Screenshot

• iOS Demo

• macOS Demo

• tvOS Demo

• watchOS Demo

Extra Notes

Besides all above things, this project can also ensure the following function available on Swift platform for SDWebImage itself.

• SwiftUI compatibility
• Swift Package Manager integration
• Swift source code compatibility and Swifty

Which means, this project is one core use case and downstream dependency, which driven SDWebImage itself future development.

Author

DreamPiggy

License

SDWebImageSwiftUI is available under the MIT license. See the LICENSE file for more info.