在SwiftUI中使用SpriteKit [英] Using SpriteKit inside SwiftUI
问题描述
在SwiftUI
中创建SpriteKit
场景时遇到问题.我最初将此项目创建为SwiftUI
项目.
I am having an issue when creating a SpriteKit
scene within SwiftUI
. I created this project initially as a SwiftUI
project.
这是我到目前为止的代码:
Here is the code I have so far:
ContentView.swift:
/// Where the UI content from SwiftUI originates from.
struct ContentView : View {
var body: some View {
// Scene
SceneView().edgesIgnoringSafeArea(.all)
}
}
SceneView.swift:
/// Creates an SKView to contain the GameScene. This conforms to UIViewRepresentable, and so can be used within SwiftUI.
final class SceneView : SKView, UIViewRepresentable {
// Conformance to UIViewRepresentable
func makeUIView(context: Context) -> SKView {
print("Make UIView")
return SceneView(frame: UIScreen.main.bounds)
}
func updateUIView(_ uiView: SKView, context: Context) {
print("Update UIView")
}
// Creating scene
override init(frame: CGRect) {
super.init(frame: frame)
let scene = Scene(size: UIScreen.main.bounds.size)
presentScene(scene)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
Scene.swift:
/// The scene for the game in SpriteKit.
final class Scene : SKScene {
override func didMove(to view: SKView) {
super.didMove(to: view)
print("Scene didMove:")
}
}
问题
问题是场景正在重新加载多次,如日志所示(因为代码中有print
):
场景didMove:
Scene didMove:
制作UIView
场景didMove:
更新UIView
如您所见,Scene didMove:
被打印两次.我只想调用一次,因为我想在这里创建我的精灵.有什么想法吗?
As you can see, Scene didMove:
is printed twice. I only want this to be called once, as I want to create my sprites here. Any ideas?
推荐答案
您的SceneView
实现不正确.
SwiftUI使用结构在其DSL中构建视图-而不是视图.
SwiftUI uses structs to builds views in its DSL - not views.
您要创建一个符合UIViewRepresentable
的struct
.
struct SceneView: UIViewRepresentable {
let scene: SKScene
func makeUIView(context: Context) -> SKView {
// Let SwiftUI handle the sizing
return SKView(frame: .zero)
}
func updateUIView(_ uiView: SKView, context: Context) {
uiView.presentScene(scene)
}
}
有关如何将基于UIKit
的视图移植到SwiftUI的更多信息,请参见以下出色的WWDC 2019视频:集成SwiftUI .
For more info on how to port UIKit
-based views to SwiftUI, see this excellent WWDC 2019 video: Integrating SwiftUI.
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