[英]Swift: pass ARView to Coordinator
真的坚持这一点。 我正在尝试将 ARView 从 MakeUIView 传递给 makeCoordinator 我真的需要它来在@objc func handleTap 中使用ARView
struct ARViewContainer: UIViewRepresentable{
func makeUIView(context: Context) -> ARView {
let myARView = ARView(frame: .zero)
//...config and things….
let tapGesture = UITapGestureRecognizer(target: context.coordinator, action: #selector(context.coordinator.handleTap(_:)))
myARView.addGestureRecognizer(tapGesture)
return myARView
}
func makeCoordinator() -> Coordinator {
Coordinator("whatshouldiusehere", self.$focusObject, self.$focusName)
}
class Coordinator: NSObject {
private let view: ARView
private var object: Binding<Entity?>
private var objectname: Binding<String?>
init(_ view: ARView, _ obj: Binding<Entity?>, _ objname: Binding<String?>) {
self.objectname = objname
self.object = obj
self.view = view
super.init()
}
@objc func handleTap(_ sender: UIGestureRecognizer? = nil) {
guard let touchInView = sender?.location(in: view) else {
return
}
guard let hitEntity = view.entity(at: touchInView) else {return}
//doing something with object here, assigning to @Binding for example
}
}
}
我无法将 myARView = ARView(frame: .zero) 移到 makeUIView 之外,因为我正在使用 SwiftUI,并且每次变量更改时它都会初始化。 但是我怎么能以任何方式通过它呢? 或任何其他选项同时访问与 ARView 绑定。
协调器可通过上下文获得,因此您可以通过属性注入它,例如
struct ARViewContainer: UIViewRepresentable{
func makeUIView(context: Context) -> ARView {
let myARView = ARView(frame: .zero)
//...config and things….
let tapGesture = UITapGestureRecognizer(target: context.coordinator, action: #selector(context.coordinator.handleTap(_:)))
myARView.addGestureRecognizer(tapGesture)
context.coordinator.view = myARView // << inject here !!
return myARView
}
func makeCoordinator() -> Coordinator {
Coordinator(self.$focusObject, self.$focusName)
}
class Coordinator: NSObject {
var view: ARView? // << optional initially
private var object: Binding<Entity?>
private var objectname: Binding<String?>
init(_ obj: Binding<Entity?>, _ objname: Binding<String?>) {
self.objectname = objname
self.object = obj
super.init()
}
// ... other code update accordingly
}
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