what is swift Guard?and explain Ios Swift Guard Statements

 SwiftUI provides illustrations, controllers, and style structures for publishing your App's UI. The framework renders event handlers for delivering patches, gestures, and other input types to your app. 

SwiftUI may be smart or stylish to demonstrate user interfaces for any Apple platform. You will create attractive, dynamic apps and implement your idea faster than ever before. 

It manages data due to your app's models right down to the illustrations and controllers that users will see and interact. SwiftUI determines your application composition using the protocol of the app. It populates it with views that contain the illustrations that structure your app's interface. 

Using stacks, lists, you will create illustrations that accept the protocol of views and controllers to compose the interface by displaying text, pictures, voice, search mode, and shapes. SwiftUI can adapt context and presentation by sharing the code between apps on multiple platforms. 

SwiftUI also blends with frameworks like UIkit, Watchkit, and Appkit within the advantage of platform functionality. It supports customizable accessibility and simplifies app's interface with different languages, countries, and cultural regions.,More info visit:swift ios online course

SwiftUI components: 

  • Essentials: This causes you to learn composing of rich views out of straightforward ones, fixing data flows, build or create navigation, and unfold in Xcode's preview. 

  • Drawing and Animation: This causes you to discover to draw shapes, paths, links, pictures for creating a badge to animate parallelly creates transition views. 

  • App Design and Layout: This causes you to explore the structure interface and layout of a sophisticated interface. 

  • Framework Integration: It uses views alongside the illustrations and considers controllers. 

Declarative vs. Imperative programming: 


 

  • Declarative programming may be building the structure and components of programs that display an execution's logic without explaining its control flow.


  • Imperative programming uses statements that modify a program's environment. The imperative in natural languages forwards commands, and a critical program consists of commands for the pc to perform.


SwiftUI list: 

A-List may be a container that displays rows of knowledge arranged during a single column.

Run Xcode on your Mac, then go to File > New > Project. Within the same template, select the IOS platform, and select the only View App template. 

Then click Next, enter SwiftUIListTutorial because the Product Name selects the utilization checkbox and clicks on Next.

If the canvas is not visible in the canvas, click Resume to display the preview, select Editor > Editor, and Canvas to show it.  

In the Project navigator, click to pick ContentView.swift. Above the ContentView struct, add a replacement struct, which will represent the info model.  

struct Weather: Identifiable 

{ 

var id = UUID() 

var image: String 

var temp: Int 

var city: String 

}

The struct will allow views to spot the things during a struct uniquely. The sole requirement of performing the Identifiable protocol is that the id variable. Here, the UUID() method uses to offer the id a singular number. 

The information model has three properties:

  1. Image: this may be the name of the system image and it presents 1,500 configurable shapes and characters. 

  2. Temp: The forecast temperature. 

  3. City: the town name 

For modeldata property add Weather data with some parameters. 

let modelData: [Weather] = 

Weather(image: "cloud.rain", temp: 21, city: "Amsterdam"), 

Weather(image: "cloud.sun.rain", temp: 18, city: "London"), 

Weather(image: "sun.max", temp: 25, city: "Paris"), 

Weather(image: "cloud.sun", temp: 23, city: "Tokyo")] 

  • Inside the body View, add an inventory. 

var body: some View { 

List(modelData) { weather in 

HStack { 

Image(systemName: weather.image) 

.frame(width: 50, height: 10, alignment: .leading) 

Text("\(weather.temp)º") 

.frame(width: 50, height: 10, alignment: .leading) 

VStack { 

Text(weather.city) 

} 

}.font(.title) 

}

}

  • A list is made by iterating through the model data array. 

  • The Image() method displays the system icons. The names are often looked up with the SF Symbols application. 

  • First, add a navigation bar with a title, embed the List inside a NavigationView, and add a .navigationBarTitle() modifier. 

var body: some View { 

NavigationView() { 

List(modelData) { weather in 

HStack { 

Image(systemName: weather.image) 

.frame(width: 50, height: 10, alignment: .leading) 

Text("\(weather.temp)º") 

.frame(width: 50, height: 10, alignment: .leading) 

VStack { 

Text(weather.city) 

} 

}.font(.title) 

} 

.navigationBarTitle(Text("World Weather")) 

} 

}

  • To add a detailed view, embed the HStack during a NavigationButton inside the List. 

var body: some View { 

NavigationView() { 

List(modelData) { weather in 

NavigationLink(destination: Text(weather.city).font(.largeTitle)) { 

HStack { 

Image(systemName: weather.image) 

.frame(width: 50, height: 10, alignment: .leading) 

Text("\(weather.temp)º") 

.frame(width: 50, height: 10, alignment: .leading) 

VStack { 

Text(weather.city) 

} 

}.font(.title) 

} 

} 

.navigationBarTitle(Text("World Weather")) 

} 

} 

  • This target parameter of the NavigationLink() method will display a text view with the present city within the detail view. When the NavigationLink() method performs, indicators will happen to the List items.

  • In preview mode, no communication is feasible. Press the play button to the proper of the preview to enter Live mode. Select an item, and therefore the detailed view will perform.

SwiftUI Textfield:

A TextField performs an editable text area. Here, the entered text will be used to update a text view instantly.

Run Xcode on your Mac, then go to File > New > Project. Within the same template, select the IOS platform, and select the only View App template. 

Then click Next, enter SwiftUITextTutorial because the Product Name selects the utilization checkbox and clicks on Next.

If the canvas is not visible in the canvas, click Resume to display the preview, select Editor > Editor, and Canvas to show it.  

In the Project navigator, click to pick ContentView.swift. Above the ContentView struct, add a replacement struct, which will represent the info model.

struct ContentView: View {

    @State var name: String = ""

    var body: some View {

        VStack {

            TextField(" Enter some text", text: $name)

                .border(Color.black)

            Text("Text entered:")

            Text("\(name)")

        }

        .padding()

        .font(.title)

    }

}


  1. The state describes the registered text inside the text field.

  2. This text field demonstrates a placeholder text. 

  3. A border modifies to make it clear that the side of the text field is registered text. 

  4. The registered text will demonstrate inside the text view.

SwiftUI example: 

KeyboardKitSwiftUI extends KeyboardKit with SwiftUI functionality. It is briefly a particular framework as Xcode cannot operate iOS 13 features during a framework that targets iOS 11. If it fixes, Xcode adds a keyboardkit to its library or stops supporting the IOS 13 software. 

Support:

  • It helps you build KeyboardKit-based keyboard extensions in SwiftUI. It takes a custom SwiftUI View and can use this view to resize the extension. 

  • SwiftUI also will find out the keyboard with a VisibleKeyboardContext and a typical keyboard style. 

  • The context contains both visible context and specific context extensions. 

  1. Extensions contain SwiftUI-specific extensions. 

  2. Gestures contain distinct keyboard gestures. 

  3. Settings contain particular extensions. 

  4. The System contains illustrations, extensions, and controllers that help to make a system keyboard. 

  5. Toast contains SwiftUI-specific components to point out a toast on top of a keyboard extension, a bit like notifications. 

  6. Views contain remarkable keyboard views. 

How to create keyboards with SwiftUI: 

  • There is no wonder using the keyboard library in SwiftUI. You will use any views. It just allows them to trigger actions once they pressed. 

  • SwiftUI remains considerably a piece ongoing, but my goal is to possess generous SwiftUI support in KeyboardKit 4.0. So far, the support is pretty necessary. 

  • Use any views and manually call the action handler once they pressed. 

  • To trigger function, press view+keyboardGestures. 

  • For applying a selected keyboard action, press View+keyboardAction. 

  • Use any views and use View+System to use various systems look and feel to them, e.g., systemKeyboardButtonStyle. 

  • To try the native look of keyboard button action, press SystemKeyboardButton. For creating complex keyboards, use views namespace. 

Conclusion:

In this article, we learned about how SwiftUI works and its components. We also gained knowledge about programming paradigms, SwiftUI Lists, Texts and its properties. We used an example of how to use keyboardkit in swift. To learn more about this article, follow to swift course

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