求问可消失式灰色透明信息弹窗的名称及APP制作方法

Hey there! The component you’re describing is almost certainly a Toast Notification (often just called a "Toast" for brevity). Sometimes folks refer to similar components as Snackbars, but Toasts are the classic fit here—small, semi-transparent, auto-dismissing, and perfect for showing quick, custom messages without interrupting the user.

To recap: Toast Notification is the standard industry name for this lightweight popup. It gets its name from how it "pops up" like toast from a toaster, then disappears after a short time.

Below are practical, platform-specific examples to build a custom gray-transparent Toast that supports dynamic messages:

1. Android (Native Kotlin) #

Android has a built-in Toast class that’s easy to tweak to match your gray-transparent design:

fun showCustomToast(context: Context, message: String) {
    // Create base toast with your message
    val toast = Toast.makeText(context, message, Toast.LENGTH_SHORT)
    val toastView = toast.view

    // Set semi-transparent gray background
    toastView.setBackgroundColor(Color.parseColor("#80333333")) // 50% opaque dark gray
    // Customize text appearance
    val textView = toastView.findViewById<TextView>(android.R.id.message)
    textView.setTextColor(Color.WHITE)
    textView.textSize = 14f
    textView.gravity = Gravity.CENTER

    toast.show()
}

• Use LENGTH_SHORT (~2 seconds) or LENGTH_LONG (~3.5 seconds) to control how long it stays visible.
• Adjust the hex color’s first two digits to change transparency (e.g., #CC = 80% opacity, #40 = 25% opacity).

2. iOS (Native Swift) #

iOS doesn’t include a native Toast, but you can build a simple one with UIView in just a few lines:

func showCustomToast(message: String, in parentView: UIView) {
    // Create the toast container
    let toastView = UIView()
    toastView.backgroundColor = UIColor(white: 0.2, alpha: 0.8)
    toastView.layer.cornerRadius = 8
    toastView.translatesAutoresizingMaskIntoConstraints = false

    // Add message label
    let messageLabel = UILabel()
    messageLabel.text = message
    messageLabel.textColor = .white
    messageLabel.font = UIFont.systemFont(ofSize: 14)
    messageLabel.numberOfLines = 0
    messageLabel.translatesAutoresizingMaskIntoConstraints = false
    toastView.addSubview(messageLabel)

    // Add toast to parent view
    parentView.addSubview(toastView)

    // Set constraints to center at bottom with padding
    NSLayoutConstraint.activate([
        messageLabel.leadingAnchor.constraint(equalTo: toastView.leadingAnchor, constant: 16),
        messageLabel.trailingAnchor.constraint(equalTo: toastView.trailingAnchor, constant: -16),
        messageLabel.topAnchor.constraint(equalTo: toastView.topAnchor, constant: 12),
        messageLabel.bottomAnchor.constraint(equalTo: toastView.bottomAnchor, constant: -12),

        toastView.centerXAnchor.constraint(equalTo: parentView.centerXAnchor),
        toastView.bottomAnchor.constraint(equalTo: parentView.safeAreaLayoutGuide.bottomAnchor, constant: -20),
        toastView.widthAnchor.constraint(lessThanOrEqualTo: parentView.widthAnchor, constant: -40)
    ])

    // Animate in and auto-dismiss
    toastView.alpha = 0
    UIView.animate(withDuration: 0.3) { toastView.alpha = 1 }
    DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
        UIView.animate(withDuration: 0.3) { toastView.alpha = 0 } completion: { _ in
            toastView.removeFromSuperview()
        }
    }
}

• Call this from your view controller like so: showCustomToast(message: "Your custom text here", in: view)

3. Cross-Platform Frameworks #

React Native #

For React Native, you can use a popular library like react-native-toast-message or build a custom component. Here’s a quick setup with the library:
First install it:

npm install react-native-toast-message

Then integrate it into your app:

import Toast from 'react-native-toast-message';

// Trigger the toast from any component
const showMyToast = (message) => {
    Toast.show({
        text1: message,
        style: { backgroundColor: 'rgba(51, 51, 51, 0.8)', borderRadius: 8 },
        text1Style: { color: 'white', fontSize: 14 },
        visibilityTime: 2000 // Auto-dismiss after 2 seconds
    });
};

// Don't forget to add the Toast component to your root app component
function App() {
    return (
        <>
            {/* Your app's main content */}
            <Toast />
        </>
    );
}

Flutter #

Flutter’s SnackBar can be customized to look exactly like a Toast. Here’s how:

void showCustomToast(BuildContext context, String message) {
    final customSnackBar = SnackBar(
        content: Text(
            message,
            style: const TextStyle(color: Colors.white, fontSize: 14),
            textAlign: TextAlign.center,
        ),
        backgroundColor: const Color.fromRGBO(51, 51, 51, 0.8),
        behavior: SnackBarBehavior.floating,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
        duration: const Duration(seconds: 2),
        margin: const EdgeInsets.only(bottom: 20, left: 20, right: 20),
    );

    ScaffoldMessenger.of(context).showSnackBar(customSnackBar);
}

• Call it with showCustomToast(context, "Your dynamic message") from any widget.

Pro Tips for Customization #

• Transparency: Play with alpha values to balance readability and non-intrusiveness—0.7-0.8 opacity is a sweet spot for gray backgrounds.
• Dynamic Content: All the examples above accept a message parameter, so you can pass any custom text you need at runtime.
• Position: Most Toasts sit at the bottom, but you can adjust constraints (Android) or layout anchors (iOS) to place them at the top or center if needed.
• Accessibility: Ensure text contrast meets WCAG standards (white text on dark gray works well) so all users can read the message.

内容的提问来源于stack exchange，提问作者Kazhiunea