Awesome

This article refers to SwiftUI apple example and records the results of the exploration here, I hope to be helpful to you.

For the content described in this article, by default you have some experience based on Swift language development, so it will not describe every detail in detail; if you have doubts about Swift syntax, you can learn Swift Grammar.

When learning and using SwiftUI, if you have any questions, you can join the SwiftUI QQ Group: 18552966 to discuss communication.

中文版🇨🇳

Recommended Preview: Windows 11 desktop client implemented using SwiftUI.

<img width="80%" src="images/windows11/launchpad.png"/>

⭐️ Stargazers over time

💻 Requirements

• macOS 10.15
• Xcode 11.0
• iOS 13.0

Directory：

Basic View

• <span id="Text_D">Text</span>

  • Text
  • TextField
  • SecureField

• <span id="Image_D">Image</span>

  • Image
  • WebImage

• <span id="Button_D">Button</span>

  • Button
  • PullDownButton
  • ItemBasedPopUpButton
  • NavigationButton
  • PresentationButton
  • EditButton
  • PasteButton

• <span id="Picker_D">Picker</span>

  • Picker
  • DatePicker
  • Toggle
  • Slider
  • Stepper
  • SegmentedControl

• <span id="Special_D">Special Views</span>

  • WebView
  • UIViewController

<span id="Layout_D">Layout</span>

• <span id="Stacks_D">Stacks</span>

  • HStack
  • VStack
  • ZStack

• <span id="List_D">List</span>

  • List
  • ScrollView
  • ForEach

• <span id="Container_D">Container Views</span>

  • Group
  • GroupBox
  • Section
  • Form

• <span id="Architectural_D">Architectural Views</span>

  • NavigationView
  • TabView
  • HSplitView
  • VSplitView

• <span id="Alert_D"> Alert </span>

  • Alert
  • Modal
  • Popover
  • Sheet
  • ActionSheet

<span id="State_D">State and Data Flow</span>

• <span id="Bindings_D"> Bindings </span>

  • Binding

• <span id="Data_D"> Data-Dependent Views </span>

  • State
  • ObjectBinding
  • EnvironmentObject

• <span id="Environment_D"> Environment Values </span>

  • Environment
  • EnvironmentValues

• <span id="ENavigation_D"> ENavigation Models </span>

  • DynamicNavigationDestinationLink

• <span id="Preferences_D"> Preferences </span>

  • LocalizedStringKey

• <span id="Transactions_D"> Transactions </span>

  • Transaction

<span id="Gestures_D">Gestures</span>

• <span id="BasicGestures_D"> Basic Gestures </span>

  • TapGesture
  • LongPressGesture
  • DragGesture
  • MagnificationGesture
  • RotationGesture

• <span id="Combined_D"> Combined Gestures </span>

  • SequenceGesture
  • SimultaneousGesture
  • ExclusiveGesture

• <span id="Custom_D"> Custom Gestures </span>

  • AnyGesture

Text is used to display one or more lines of text content with the same effect as UILabel, but it is even better.

If you want to create Text, just create it with Text("SwiftUI"); With chained syntax, you can also add multiple attributes to the text, such as fonts, colors, shadows, spacing between top left and right, and so on.

Example:

Text("SwiftUI")
    .foregroundColor(.orange)
    .bold()
    .font(.system(.largeTitle))
    .fontWeight(.medium)
    .italic()
    .shadow(color: .black, radius: 1, x: 0, y: 2)

HStack and VStack controls are used to host multiple views, as mentioned later.

🔝

TextField is used to add a normal input box, which is often used as a text input.

Example：

TextField(self.$name, placeholder: self.nameText, onEditingChanged: { changed in
    print("onEditing: \(changed)")
}) {
    print("userName: \(self.name)")
    self.endEditing(true)
}}
.padding(10)
.frame(height: 50)
.textFieldStyle(RoundedBorderTextFieldStyle())
.padding(EdgeInsets(top: 0, leading: 20, bottom: 0, trailing: 20))

🔝

SecureField is generally used as a password input. It is used in the same way as TextField. The example and the running effect are the same as TextField.

The Image control is used to display images, example:

Image("icon")
    .resizable()
    .frame(width: 100,
           height: 100,
           alignment: .center)

🔝

webImage is used to download the web image, use the URLSession to download the original Image after successful download; you can also use Kingfisher in the downloadWebImage function .

Example：

var body: some View {
        Image(uiImage: self.uiImage ?? placeholderImage)
            .resizable()
            .onAppear(perform: downloadWebImage)
            .frame(width: 80,
                   height: 80,
                   alignment: .center)
            .onTapGesture {
                print("Tap ")
        }
    }

🔝

Button is used to respond to click events.

Example:

Button(action: {
    print("Tap")
}) {
   Text("I'm a Button")
}

🔝

Waiting for release.

Waiting for release.

NavigationButtonPage is used to push to the next navigation page.

Example:

NavigationLink(destination: NavigationButtonPage()) {
            Text("NavigationButton").bold()
                .foregroundColor(.orange)
                .font(.largeTitle)
            }
    .navigationBarTitle(Text("Page"))

🔝

PresentationButton is used to pop up a page. has deprecated, please use NavigationLink

🔝

EditButton is used to trigger the editing state, just use the navigationBarItems setting when using it.

Example:

navigationBarItems(trailing: EditButton())

🔝

Waiting for release.

Picker can customize the selector of the data source.

Example:

Picker(selection: $leftIndex, label: Text("Picker")) {
    ForEach(0..<leftSource.count) {
        Text(self.leftSource[$0]).tag($0)
    }
    }.frame(width: UIScreen.main.bounds.width/2)

🔝

DatePicker is used to select the absolute date of the control.

Example:

DatePicker(selection: $server.date, 
in: server.spaceDate, 
displayedComponents: .date, label: {
    Text("")
})

🔝

Toggle is used to switch the selected state, for example:

Toggle(isOn: $isOn) {
    Text("State: \(self.isOn == true ? "Open":"open")")
}.padding(20)

🔝

Slider A control for selecting values from a finite range of values, example:

Slider(value: $data.rating)

🔝

Stepper is used to increase or decrease the value, example:

Stepper(value: $value, step: 2, onEditingChanged: { c in
    print(c)
}) {
    Text("Stepper Value: \(self.value)")
    }.padding(50)

🔝

SegmentedControl is used for segmentation condition selection, example:

SegmentedControl(selection: $currentIndex) {
    ForEach(0..<items.count) { index in
        Text(self.items[index]).tag(index)
    }
    }.tapAction {
        print("currentIndex: \(self.currentIndex)")
}

🔝

WebView is used to display an open web page, example:

struct WebViewPage : UIViewRepresentable {
    func makeUIView(context: Context) -> WKWebView  {
        return WKWebView()
    }
    func updateUIView(_ uiView: WKWebView, context: Context) {
        let req = URLRequest(url: URL(string: "https://www.apple.com")!)
        uiView.load(req)
    }
}

🔝

UIViewController is used to display the UIViewController that opens UIKit in SwiftUI and opens the SwiftUI View in UIViewController.

Example:

First define:

struct ControllerPage<T: UIViewController> : UIViewControllerRepresentable {
    
    typealias UIViewControllerType = UIViewController
    
    func makeUIViewController(context: UIViewControllerRepresentableContext<ControllerPage>) -> UIViewController {
        return T()
    }
    
    func updateUIViewController(_ uiViewController: UIViewController, context: UIViewControllerRepresentableContext<ControllerPage>) {
        debugPrint("\(#function)：\(type(of: T.self))")
    }
    
}

Then use this:

NavigationButton(destination: ControllerPage<UIKitController>()) {
    PageRow(title: "UIViewController",subTitle: "Open UIViewController")

}

🔝

Layout

HStack is used to arrange the subviews on a horizontal line.

Example:

HStack {
    Text("made in China.")
    Divider() // Just add a line.
    Text("the People's Republic Of China.")
}

🔝

VStack is used to arrange the subviews on a vertical line.

Example:

VStack {
    Text("made in China.")
    Divider() // Just add a line.
    Text("the People's Republic Of China.")
}

🔝

ZStack is used to override the subview, aligned on two axes.

Example:

ZStack {
    Text("made in China.")
    Divider() // Just add a line.
    Text("the People's Republic Of China.")
}

🔝

List list container to display a list of data.

Examples:

List(0..<5) { item in
    Text("Hello World !")
}.navigationBarTitle(Text("List"), displayMode: .large)

🔝

ScrollView is a scroll view container.

Example:

ScrollView {
    Text("SwiftUI").padding(20)
    Divider()
    Image("icon").resizable()
        .frame(width: 300, height: 300, alignment: .center)
    Divider()
    Text("Views and ... user interface.")
    }
    .border(Color.gray.gradient, width: 1)
            .cornerRadius(10)
            .padding(10)
            .navigationBarTitle(Text("ScrollView"))

🔝

ForEach is used to present a view based on a collection of existing data.

Example:

let data = (0..<5)
var body: some View {
    ForEach(data) { e in
        Text("Hello \(e)")
            .bold()
            .font(.system(size: 25, design: .monospaced))
            .padding(5)
}

🔝

Group is used to aggregate multiple views, and the properties set on the Group will be applied to each child view.

Example:

Group {
        Text("Hello World !")
        Text("Hello World !")
      }

🔝

Waiting for release.

Section is used to create the header/footer view content, which is generally used in conjunction with the List component.

Example:

Section(header: Text("I'm header"), footer: Text("I'm footer")) {
    ForEach(0..<3) {
        Text("Hello \($0)")
    }
}

Form A container for grouping controls used for data entry, such as in settings or inspectors.

Example:

Form {
   TextField("First Name", text: $firstName)
   TextField("Last Name", text: $lastName)
}

🔝

NavigationView is used to create a view container that contains the top navigation bar.

Example:

NavigationView {
            Text("🧚‍♂️🧚‍♀️🧜‍♂️🧜‍♀️🧞‍♂️🧞‍♀️").blur(radius: 5)
            Text("Swifter Swifter")
            .bold()
                .foregroundColor(.orange)
                .font(.largeTitle)
        }
    .navigationBarTitle(Text("NavigationView"))

🔝

TabView is used to create a view container that contains the bottom ** TabBar**.

Example:

TabView(selection: $index) {
    ForEach(0..<imgs.count) { item in
        TabItemPage(index: item)
            .tabItem{
                Image(self.imgs[item])
                Text("\(item)")
        }
        .tag(item)
    }
}

🔝

Waiting for release.

Waiting for release.

🔝

Alert is used to display a bullet reminder that needs to be associated with a trigger event.

Example:

alert(isPresented: $showAlert, content: {
            Alert(title: Text("确定要支付这100000000美元吗？"),
                  message: Text("请谨慎操作\n一旦确认，钱款将立即转入对方账户"),
                  primaryButton: .destructive(Text("确认")) { print("转出中...") },
                  secondaryButton: .cancel())
        }).navigationBarTitle(Text("Alert"))

🔝

ActionSheet is used to pop up a selection box.

Example:

ActionSheet(title: Text("Title"),
            message: Text("Message"),
            buttons:
    [.default(Text("Default"), onTrigger: {
        print("Default")
        self.showSheet = false
    }),.destructive(Text("destructive"), onTrigger: {
        print("destructive")
        self.showSheet = false
    }),.cancel({
        print("Cancel")
        self.showSheet = false
    })])

usage：

.actionSheet(isPresented: $showSheet, content: {sheet})

🔝

Modal is used to pop up a view.

Example:

Modal(Text("Modal View"),onDismiss: {
    print("View Dismiss !")
})

🔝

Popover is used to pop up a view, see the results below.

Example:

.popover(isPresented: $showPop, content: {
                ImagePage()
        })

🔝

📎 About

• The code involved in the above example is in this repository code. It is recommended to download and run the view.
• If you have better usage and suggestions about SwiftUI, look forward to sharing it!
• If there are omissions and errors in the examples in this article, please create a Issue !

✉️ Contacts

email : hi@jinxiansen.com

微博 : @晋先森

📄 License

SwiftUI is released under the MIT license. See LICENSE for details.