问题描述
我正在创建这个面板
@available(iOS 15.0,*)
struct CustomSheet: View {
@State private var isPresented = false
var body: some View {
Button(isPresented ? "dismiss content" : "present content",action: {
isPresented.toggle()
})
CustomSheet_UI(isPresented: $isPresented,detents: [.medium()],smallestUndimmedDetentIdentifier: .large){
Rectangle()
.frame(maxWidth: .infinity,maxHeight: .infinity,alignment: .center)
.foregroundColor(.clear)
.border(Color.blue,width: 3)
.overlay(Text("Hello,World!"))
}
}
}
@available(iOS 15.0,*)
struct CustomSheet_UI<Content: View>: UIViewControllerRepresentable {
let content: Content
@Binding var isPresented: Bool
let detents : [UISheetPresentationController.Detent]
let smallestUndimmedDetentIdentifier: UISheetPresentationController.Detent.Identifier?
let prefeRSScrollingExpandsWhenScrolledToEdge: Bool
let prefersEdgeAttachedInCompactHeight: Bool
init(isPresented: Binding<Bool>,detents : [UISheetPresentationController.Detent] = [.medium(),.large()],smallestUndimmedDetentIdentifier: UISheetPresentationController.Detent.Identifier? = .medium,prefeRSScrollingExpandsWhenScrolledToEdge: Bool = false,prefersEdgeAttachedInCompactHeight: Bool = true,@viewbuilder content: @escaping () -> Content) {
self.content = content()
self.detents = detents
self.smallestUndimmedDetentIdentifier = smallestUndimmedDetentIdentifier
self.prefersEdgeAttachedInCompactHeight = prefersEdgeAttachedInCompactHeight
self.prefeRSScrollingExpandsWhenScrolledToEdge = prefeRSScrollingExpandsWhenScrolledToEdge
self._isPresented = isPresented
}
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
func makeUIViewController(context: Context) -> CustomSheetViewController<Content> {
let vc = CustomSheetViewController(coordinator: context.coordinator,detents : detents,smallestUndimmedDetentIdentifier: smallestUndimmedDetentIdentifier,prefeRSScrollingExpandsWhenScrolledToEdge: prefeRSScrollingExpandsWhenScrolledToEdge,prefersEdgeAttachedInCompactHeight: prefersEdgeAttachedInCompactHeight,content: {content})
return vc
}
func updateUIViewController(_ uiViewController: CustomSheetViewController<Content>,context: Context) {
if isPresented{
uiViewController.presentModalView()
}else{
uiViewController.dismissModalView()
}
}
class Coordinator: NSObject,UIAdaptivePresentationControllerDelegate {
var parent: CustomSheet_UI
init(_ parent: CustomSheet_UI) {
self.parent = parent
}
//Adjust the variable when the user dismisses with a swipe
func presentationControllerDiddismiss(_ presentationController: UIPresentationController) {
if parent.isPresented{
parent.isPresented = false
}
}
}
}
@available(iOS 15.0,*)
class CustomSheetViewController<Content: View>: UIViewController {
let content: Content
let coordinator: CustomSheet_UI<Content>.Coordinator
let detents : [UISheetPresentationController.Detent]
let smallestUndimmedDetentIdentifier: UISheetPresentationController.Detent.Identifier?
let prefeRSScrollingExpandsWhenScrolledToEdge: Bool
let prefersEdgeAttachedInCompactHeight: Bool
init(coordinator: CustomSheet_UI<Content>.Coordinator,@viewbuilder content: @escaping () -> Content) {
self.content = content()
self.coordinator = coordinator
self.detents = detents
self.smallestUndimmedDetentIdentifier = smallestUndimmedDetentIdentifier
self.prefersEdgeAttachedInCompactHeight = prefersEdgeAttachedInCompactHeight
self.prefeRSScrollingExpandsWhenScrolledToEdge = prefeRSScrollingExpandsWhenScrolledToEdge
super.init(nibName: nil,bundle: .main)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func dismissModalView(){
dismiss(animated: true,completion: nil)
}
func presentModalView(){
let hostingController = UIHostingController(rootView: content)
hostingController.modalPresentationStyle = .popover
hostingController.presentationController?.delegate = coordinator as UIAdaptivePresentationControllerDelegate
if let hostPopover = hostingController.popoverPresentationController {
hostPopover.sourceView = super.view
let sheet = hostPopover.adaptiveSheetPresentationController
sheet.detents = detents
sheet.smallestUndimmedDetentIdentifier =
smallestUndimmedDetentIdentifier
sheet.prefeRSScrollingExpandsWhenScrolledToEdge =
prefeRSScrollingExpandsWhenScrolledToEdge
sheet.prefersEdgeAttachedInCompactHeight =
prefersEdgeAttachedInCompactHeight
sheet.widthFollowsPreferredContentSizeWhenEdgeAttached = true
}
if presentedViewController == nil{
present(hostingController,animated: true,completion: nil)
}
}
}
创建面板后如何访问面板上的控件。这些面板不止一个，它们可以随时移除和重新绘制，因此需要动态创建。
我尝试过这样的事情，但我认为我离得很远。 p 是相关的面板编号。
Label PrinterName = new Label();
Label Format = new Label();
Label Count = new Label();
Label FormatLabel = new Label();
Label PrintedLabel = new Label();
Label ResourceLabel = new Label();
Button Detailsbutton = new Button();
Button PrintButton = new Button();
PictureBox LabelImageBox = new PictureBox();
Panel panel1 = new Panel();
ComboBox PrinterComboBox = new ComboBox();
PrinterName.Font = new System.Drawing.Font("Microsoft Sans Serif",16F,System.Drawing.FontStyle.Regular,system.drawing.graphicsUnit.Point,((byte)(0)));
PrinterName.Location = new System.Drawing.Point(11,9);
PrinterName.Name = "PrinterName";
PrinterName.Size = new System.Drawing.Size(169,28);
PrinterName.TabIndex = 5;
PrinterName.Text = printers[pc * 3];
//
// Format
//
Format.Font = new System.Drawing.Font("Microsoft Sans Serif",((byte)(0)));
Format.Location = new System.Drawing.Point(195,51);
Format.Name = "Format" +pc.ToString();
Format.Size = new System.Drawing.Size(169,28);
Format.TabIndex = 7;
Format.Text = "Label Format";
Count.Font = new System.Drawing.Font("Microsoft Sans Serif",((byte)(0)));
Count.Location = new System.Drawing.Point(370,51);
Count.Name = "Count";
Count.Size = new System.Drawing.Size(109,28);
Count.TabIndex = 8;
Count.Text = "Count";
//
// Detailsbutton
//
Detailsbutton.Location = new System.Drawing.Point(485,60);
Detailsbutton.Name = "Detailsbutton";
Detailsbutton.Size = new System.Drawing.Size(91,45);
Detailsbutton.TabIndex = 11;
Detailsbutton.Text = "Datails";
Detailsbutton.UseVisualStyleBackColor = true;
//
// PrinterComboBox
//
PrinterComboBox.Font = new System.Drawing.Font("Microsoft Sans Serif",((byte)(0)));
PrinterComboBox.FormattingEnabled = true;
PrinterComboBox.Location = new System.Drawing.Point(16,66);
PrinterComboBox.Name = "PrinterComboBox";
PrinterComboBox.Size = new System.Drawing.Size(157,33);
PrinterComboBox.TabIndex = 10;
PrinterComboBox.Items.AddRange(resourcenumbers());
PrinterComboBox.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
PrinterComboBox.AutoCompleteSource = AutoCompleteSource.ListItems;
PrinterComboBox.SelectedindexChanged += (s,e) => { selectedindexchanged(pc); };
//
// PrintButton
//
PrintButton.Location = new System.Drawing.Point(485,9);
PrintButton.Name = "PrintButton";
PrintButton.Size = new System.Drawing.Size(91,45);
PrintButton.TabIndex = 9;
PrintButton.Text = "Print";
PrintButton.UseVisualStyleBackColor = true;
//
// FormatLabel
//
FormatLabel.Font = new System.Drawing.Font("Microsoft Sans Serif",((byte)(0)));
FormatLabel.Location = new System.Drawing.Point(195,23);
FormatLabel.Name = "FormatLabel";
FormatLabel.Size = new System.Drawing.Size(169,28);
FormatLabel.TabIndex = 12;
FormatLabel.Text = "Format:";
//
// PrintedLabel
//
PrintedLabel.Font = new System.Drawing.Font("Microsoft Sans Serif",((byte)(0)));
PrintedLabel.Location = new System.Drawing.Point(370,23);
PrintedLabel.Name = "PrintedLabel";
PrintedLabel.Size = new System.Drawing.Size(109,28);
PrintedLabel.TabIndex = 13;
PrintedLabel.Text = "Printed:";
//
// ResourceLabel
//
ResourceLabel.Font = new System.Drawing.Font("Microsoft Sans Serif",((byte)(0)));
ResourceLabel.Location = new System.Drawing.Point(20,37);
ResourceLabel.Name = "ResourceLabel";
ResourceLabel.Size = new System.Drawing.Size(169,28);
ResourceLabel.TabIndex = 14;
ResourceLabel.Text = "Resoruce:";
//
// LabelImageBox
//
LabelImageBox.Location = new System.Drawing.Point(589,8);
LabelImageBox.Name = "LabelImageBox" + pc.ToString();
LabelImageBox.Size = new System.Drawing.Size(206,107);
LabelImageBox.TabIndex = 15;
LabelImageBox.TabStop = false;
//
// panel1
//
panel1.BackColor = System.Drawing.SystemColors.ActiveBorder;
panel1.Controls.Add(LabelImageBox);
panel1.Controls.Add(ResourceLabel);
panel1.Controls.Add(PrintedLabel);
panel1.Controls.Add(FormatLabel);
panel1.Controls.Add(Detailsbutton);
panel1.Controls.Add(PrinterComboBox);
panel1.Controls.Add(PrintButton);
panel1.Controls.Add(Format);
panel1.Controls.Add(Count);
panel1.Controls.Add(PrinterName);
panel1.Location = new System.Drawing.Point(106,91 + 150*pc);
panel1.Name = "panel" + pc.ToString();
panel1.Size = new System.Drawing.Size(815,126);
panel1.TabIndex = 9;
this.Controls.Add(panel1);
我还需要能够访问诸如组合框的选定索引之类的内容，例如
this.Controls["panel" + p.ToString()].Controls["Format" + p.ToString()].Text = "the thing";
解决方法
您需要为每个子控件添加一个标识符或一些东西来引用该控件。 您可以使用名称、设置标签等。
下面是删除面板中动态创建的特定按钮的示例。
foreach (Control p in this.Controls)
If (p is Panel)
{
foreach (Control PanelControl in p.Controls)
If (PanelControl.Tag.Contains("RemoveThisButton"))
{
PanelControl.Dispose();
}
}
修改数组时要小心，因为这会破坏循环。