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SDWebImageSwiftUI
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Using the isAnimating arg, instead of protocol extention method to control the `WebImage`'s animation supports. This allows the binding control for animation as well

This commit is contained in:
DreamPiggy 2020-01-26 18:12:30 +08:00
parent 7e92d42ee5
commit 8d74623282
3 changed files with 48 additions and 55 deletions
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3
Example/SDWebImageSwiftUIDemo/ContentView.swift
View File

@ -105,9 +105,8 @@ struct ContentView: View {
.scaledToFit()
.frame(width: CGFloat(100), height: CGFloat(100), alignment: .center)
#else
WebImage(url: URL(string:url))
WebImage(url: URL(string:url), isAnimating: self.$animated)
.resizable()
.animated()
.indicator { _, _ in
ActivityBar()
.foregroundColor(Color.white)

3
Example/SDWebImageSwiftUIDemo/DetailView.swift
View File

@ -95,9 +95,8 @@ struct DetailView: View {
.resizable()
.scaledToFit()
#else
WebImage(url: URL(string:url), options: [.progressiveLoad])
WebImage(url: URL(string:url), options: [.progressiveLoad], isAnimating: $isAnimating)
.resizable()
.animated(isAnimating)
.indicator { isAnimating, progress in
ProgressBar(value: progress)
.foregroundColor(.blue)

97
SDWebImageSwiftUI/Classes/WebImage.swift
View File

@ -21,8 +21,10 @@ public struct WebImage : View {
@ObservedObject var imageManager: ImageManager
// Animated Image support (Beta)
var animated: Bool = false
/// A Binding to control the animation. You can bind external logic to control the animation status.
/// True to start animation, false to stop animation.
@Binding public var isAnimating: Bool
@State var currentFrame: PlatformImage? = nil
@State var imagePlayer: SDAnimatedImagePlayer? = nil
@ -31,6 +33,23 @@ public struct WebImage : View {
/// - Parameter options: The options to use when downloading the image. See `SDWebImageOptions` for the possible values.
/// - Parameter context: A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
public init(url: URL?, options: SDWebImageOptions = [], context: [SDWebImageContextOption : Any]? = nil) {
self.init(url: url, options: options, context: context, isAnimating: .constant(false))
}
/// Create a web image with url, placeholder, custom options and context. Optional can support animated image using Binding.
/// - Parameter url: The image url
/// - Parameter options: The options to use when downloading the image. See `SDWebImageOptions` for the possible values.
/// - Parameter context: A context contains different options to perform specify changes or processes, see `SDWebImageContextOption`. This hold the extra objects which `options` enum can not hold.
/// - Parameter isAnimating: The binding for animation control. The binding value should be `true` when initialized to setup the correct animated image class. If not, you must provide the `.animatedImageClass` explicitly. When the animation started, this binding can been used to start / stop the animation.
public init(url: URL?, options: SDWebImageOptions = [], context: [SDWebImageContextOption : Any]? = nil, isAnimating: Binding<Bool>) {
self._isAnimating = isAnimating
var context = context ?? [:]
// provide animated image class if the initialized `isAnimating` is true, user can still custom the image class if they want
if isAnimating.wrappedValue {
if context[.animatedImageClass] == nil {
context[.animatedImageClass] = SDAnimatedImage.self
}
}
self.imageManager = ImageManager(url: url, options: options, context: context)
// load remote image here, SwiftUI sometimes will create a new View struct without calling `onAppear` (like enter EditMode) :)
// this can ensure we load the image, SDWebImage take care of the duplicated query
@ -40,7 +59,7 @@ public struct WebImage : View {
public var body: some View {
Group {
if imageManager.image != nil {
if animated {
if isAnimating {
if currentFrame != nil {
configurations.reduce(Image(platformImage: currentFrame!)) { (previous, configuration) in
configuration(previous)
@ -60,8 +79,14 @@ public struct WebImage : View {
}
}
} else {
configurations.reduce(Image(platformImage: imageManager.image!)) { (previous, configuration) in
configuration(previous)
if currentFrame != nil {
configurations.reduce(Image(platformImage: currentFrame!)) { (previous, configuration) in
configuration(previous)
}
} else {
configurations.reduce(Image(platformImage: imageManager.image!)) { (previous, configuration) in
configuration(previous)
}
}
}
} else {
@ -93,6 +118,22 @@ public struct WebImage : View {
}
}
}
/// Animated Image Support
func setupPlayer(image: PlatformImage?) {
if imagePlayer != nil {
return
}
if let animatedImage = image as? SDAnimatedImageProvider {
if let imagePlayer = SDAnimatedImagePlayer(provider: animatedImage) {
imagePlayer.animationFrameHandler = { (_, frame) in
self.currentFrame = frame
}
self.imagePlayer = imagePlayer
imagePlayer.startPlaying()
}
}
}
}
// Layout
@ -223,52 +264,6 @@ extension WebImage {
}
}
// Animated Image support (Beta)
@available(iOS 13.0, OSX 10.15, tvOS 13.0, watchOS 6.0, *)
extension WebImage {
/// Make the image to support animated images. The animation will start when view appears, and pause when disappears.
/// - Note: Currently we do not have advanced control like binding, reset frame index, playback rate, etc. For those use case, it's recommend to use `AnimatedImage` type instead. (support iOS/tvOS/macOS)
/// - Warning: This API need polishing. In the future we may choose to create a new View type instead.
///
/// - Parameter animated: Whether or not to enable animationn.
public func animated(_ animated: Bool = true) -> WebImage {
var result = self
result.animated = animated
if animated {
// Update Image Manager
result.imageManager.cancel()
var context = result.imageManager.context ?? [:]
context[.animatedImageClass] = SDAnimatedImage.self
result.imageManager.context = context
result.imageManager.load()
} else {
// Update Image Manager
result.imageManager.cancel()
var context = result.imageManager.context ?? [:]
context[.animatedImageClass] = nil
result.imageManager.context = context
result.imageManager.load()
}
return result
}
func setupPlayer(image: PlatformImage?) {
if imagePlayer != nil {
return
}
if let animatedImage = image as? SDAnimatedImageProvider {
if let imagePlayer = SDAnimatedImagePlayer(provider: animatedImage) {
imagePlayer.animationFrameHandler = { (_, frame) in
self.currentFrame = frame
}
self.imagePlayer = imagePlayer
imagePlayer.startPlaying()
}
}
}
}
#if DEBUG
@available(iOS 13.0, OSX 10.15, tvOS 13.0, watchOS 6.0, *)
struct WebImage_Previews : PreviewProvider {