[英]How to use PKToolPicker with PKCanvasView in SwiftUI
目前,我可以有一個單獨的PKCanvasView
和一個PKToolPicker
,當點擊按鈕時顯示。 但是,該工具不會在選擇器和畫布視圖之間傳輸。 有沒有人知道如何將兩者聯系起來,這樣當我在選擇器中更改工具時,該工具也會在畫布視圖中更新? 我在下面附上了我的代碼。 謝謝!
import SwiftUI
import PencilKit
struct DrawingView: View {
@State private var showPicker = false
@State private var canvasView = PKCanvasView()
var body: some View {
VStack {
PencilKitView(isActive: $showPicker, canvasView: $canvasView)
Button("Picker") { self.showPicker.toggle() }
}
}
}
struct PencilKitView: UIViewRepresentable {
typealias UIViewType = PKCanvasView
@Binding var isActive: Bool
@Binding var canvasView: PKCanvasView
let coordinator = Coordinator()
class Coordinator: NSObject, PKToolPickerObserver {
func toolPickerSelectedToolDidChange(_ toolPicker: PKToolPicker) {
// some code
}
func toolPickerVisibilityDidChange(_ toolPicker: PKToolPicker) {
// some code
}
}
func makeCoordinator() -> PencilKitView.Coordinator {
return Coordinator()
}
func makeUIView(context: Context) -> PKCanvasView {
canvasView
}
func updateUIView(_ uiView: PKCanvasView, context: Context) {
uiView.isOpaque = true
uiView.becomeFirstResponder()
let toolPicker = PKToolPicker.init()
toolPicker.addObserver(uiView)
toolPicker.addObserver(coordinator)
toolPicker.setVisible(isActive, forFirstResponder: uiView)
DispatchQueue.main.async {
uiView.becomeFirstResponder()
}
}
}
解決了!
import SwiftUI
import PencilKit
struct DrawingView: View {
private var canvasView = PKCanvasView()
var body: some View {
MyCanvas(canvasView: canvasView)
}
}
struct MyCanvas: UIViewRepresentable {
var canvasView: PKCanvasView
let picker = PKToolPicker.init()
func makeUIView(context: Context) -> PKCanvasView {
self.canvasView.tool = PKInkingTool(.pen, color: .black, width: 15)
self.canvasView.becomeFirstResponder()
return canvasView
}
func updateUIView(_ uiView: PKCanvasView, context: Context) {
picker.addObserver(canvasView)
picker.setVisible(true, forFirstResponder: uiView)
DispatchQueue.main.async {
uiView.becomeFirstResponder()
}
}
}
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