onLongPressGesture tvOS

Introduction

The onLongPressGesture is a SwiftUI gesture modifier available in tvOS that allows you to recognize and handle long press gestures on TV devices. A long press gesture occurs when the user presses and holds a finger on the touchpad for a specific duration.

This gesture modifier provides a convenient way to add complex interactions to your tvOS app by triggering actions based on long press gestures. It is especially useful for implementing context menus, tooltips, or any other custom behavior that requires a prolonged touch.

Syntax

The onLongPressGesture gesture modifier can be applied to any SwiftUI view. It takes a closure as a parameter, which will be executed when the long press gesture is recognized. The closure can perform specific actions or update the state of the view.

.onLongPressGesture(
    minimumDuration: Double = 0.5,
    maximumDistance: CGFloat = 10,
    pressing: ((Bool) -> Void)? = nil,
    perform: (() -> Void)? = nil
) -> some View

• minimumDuration: The minimum duration (in seconds) required for the long press gesture to be recognized. The default value is 0.5 seconds.
• maximumDistance: The maximum allowable movement (in points) for the long press gesture to be recognized. The default value is 10 points.
• pressing: An optional closure that is called when the user starts pressing or stops pressing the touchpad. It receives a boolean parameter indicating the pressing state.
• perform: An optional closure that is called when the long press gesture is recognized. It can perform specific actions or update the view's state.

Example Usage

Adding a Context Menu

import SwiftUI

struct ContentView: View {
    @State private var isContextMenuVisible = false

    var body: some View {
        Text("Press and hold to show the context menu")
            .onLongPressGesture {
                isContextMenuVisible = true
            }
            .contextMenu(isPresented: $isContextMenuVisible) {
                Button(action: {
                    // Handle context menu item selection
                }) {
                    Text("Option 1")
                    Image(systemName: "square.and.arrow.up")
                }
                Button(action: {
                    // Handle context menu item selection
                }) {
                    Text("Option 2")
                    Image(systemName: "trash")
                }
            }
    }
}

In this example, we use the onLongPressGesture modifier to recognize a long press gesture on the Text view. When the gesture is recognized, we set the isContextMenuVisible state variable to true, which shows the context menu. The context menu contains two options that can be selected by the user.

Updating View State

import SwiftUI

struct ContentView: View {
    @State private var isHighlighted = false

    var body: some View {
        Text("Press and hold to highlight")
            .padding()
            .background(isHighlighted ? Color.yellow : Color.clear)
            .onLongPressGesture(
                minimumDuration: 1,
                maximumDistance: 0,
                pressing: { isPressing in
                    isHighlighted = isPressing
                }
            )
    }
}

In this example, we apply the onLongPressGesture modifier to the Text view and provide a closure for the pressing parameter. The closure updates the isHighlighted state variable based on the pressing state of the long press gesture. When the user starts pressing, the view background color changes to yellow, and it returns to the default state when the user stops pressing.

Conclusion

The onLongPressGesture gesture modifier in tvOS allows you to handle long press gestures and add interactivity to your app. Whether you want to implement custom interactions or context menus, this modifier provides a flexible and straightforward way to incorporate long press gestures into your SwiftUI views.