[英]How to animate images in SwiftUI, to play a frame animation
我想在 SwiftUI 的圖像視圖中為圖像設置動畫
首先,我嘗試創建一些變量和一個 function 來切換 Image("imageVariable")。 它發生了變化,但沒有 animation 甚至嘗試了withAnimation { }
方法
其次,我嘗試使用 UIKit 視圖。 在這里,animation 有效,但我無法應用resizable()
修飾符或設置固定框架
var images: [UIImage]! = [UIImage(named: "pushup001")!, UIImage(named: "pushup002")!]
let animatedImage = UIImage.animatedImage(with: images, duration: 0.5)
struct workoutAnimation: UIViewRepresentable {
func makeUIView(context: Self.Context) -> UIImageView {
return UIImageView(image: animatedImage)
}
func updateUIView(_ uiView: UIImageView, context: UIViewRepresentableContext<workoutAnimation>) {
}
}
struct WorkoutView: View {
var body: some View {
VStack {
workoutAnimation().aspectRatio(contentMode: .fit)
}
}
}
在方法 1 中我可以更改圖像但不能設置動畫,而在方法 2 中我可以設置動畫但不能控制它的大小
如果你想要一個健壯的跨平台 SwiftUI 實現動畫圖像,比如 GIF/APNG/WebP,我建議使用SDWebImageSwiftUI 。 該框架基於現有的成功圖片加載框架SDWebImage並提供了 SwiftUI 綁定。
要播放動畫,請使用AnimatedImage
視圖。
var body: some View {
Group {
// Network
AnimatedImage(url: URL(string: "https://raw.githubusercontent.com/liyong03/YLGIFImage/master/YLGIFImageDemo/YLGIFImageDemo/joy.gif"))
.onFailure(perform: { (error) in
// Error
})
}
}
我使用UIViewRepresentable
協議解決了這個問題。 在這里,我返回了一個帶有ImageView
的UIView
作為它的子視圖。 這讓我可以更好地控制孩子的大小等。
import SwiftUI
var images : [UIImage]! = [UIImage(named: "pushup001")!, UIImage(named: "pushup002")!]
let animatedImage = UIImage.animatedImage(with: images, duration: 0.5)
struct workoutAnimation: UIViewRepresentable {
func makeUIView(context: Self.Context) -> UIView {
let someView = UIView(frame: CGRect(x: 0, y: 0, width: 400, height: 400))
let someImage = UIImageView(frame: CGRect(x: 20, y: 100, width: 360, height: 180))
someImage.clipsToBounds = true
someImage.layer.cornerRadius = 20
someImage.autoresizesSubviews = true
someImage.contentMode = UIView.ContentMode.scaleAspectFill
someImage.image = animatedImage
someView.addSubview(someImage)
return someView
}
func updateUIView(_ uiView: UIView, context: UIViewRepresentableContext<workoutAnimation>) {
}
}
struct WorkoutView: View {
var body: some View {
VStack (alignment: HorizontalAlignment.center, spacing: 10) {
workoutAnimation()
Text("zzzz")
}
}
}
感謝 ImageAnimated 課程! 它派上用場了! 一件事,如果您打算傳入值,持續時間應該是一個變量而不是一個常量。否則您必須將持續時間排除在 ImageAnimated(imageSize:imageNames:) 調用之外。 :)
var duration: Double = 0.5
我創建了一個可以輕松重用的圖像動畫類
import SwiftUI
struct ImageAnimated: UIViewRepresentable {
let imageSize: CGSize
let imageNames: [String]
let duration: Double = 0.5
func makeUIView(context: Self.Context) -> UIView {
let containerView = UIView(frame: CGRect(x: 0, y: 0
, width: imageSize.width, height: imageSize.height))
let animationImageView = UIImageView(frame: CGRect(x: 0, y: 0, width: imageSize.width, height: imageSize.height))
animationImageView.clipsToBounds = true
animationImageView.layer.cornerRadius = 5
animationImageView.autoresizesSubviews = true
animationImageView.contentMode = UIView.ContentMode.scaleAspectFill
var images = [UIImage]()
imageNames.forEach { imageName in
if let img = UIImage(named: imageName) {
images.append(img)
}
}
animationImageView.image = UIImage.animatedImage(with: images, duration: duration)
containerView.addSubview(animationImageView)
return containerView
}
func updateUIView(_ uiView: UIView, context: UIViewRepresentableContext<ImageAnimated>) {
}
}
使用方法:
ImageAnimated(imageSize: CGSize(width: size, height: size), imageNames: ["loading1","loading2","loading3","loading4"], duration: 0.3)
.frame(width: size, height: size, alignment: .center)
在模型中:
var publisher : Timer?
@Published var index = 0
func startTimer() {
index = 0
publisher = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true, block: {_ in
if self.index < count/*count of frames*/{
self.index += 1
}
else if let timer = self.publisher {
timer.invalidate()
self.publisher = nil
}
})
}
}
鑒於:
struct MyAnimationView : View {
let width : CGFloat
let images = (0...60).map { UIImage(named: "tile\($0)")! }
@StateObject var viewmodel : MyViewModel
var body: some View {
Image(uiImage: images[viewmodel.index])
.resizable()
.frame(width: width, height: width, alignment: .center)
}
}
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