React Native中打开PayPal WebView时禁用返回按钮的方案咨询

To disable the back button when the user enters PayPal's payment processing stage, you can monitor URL changes in the WebView and use a state variable to toggle the button's functionality. Here's how to modify your code:

Step 1: Add State to Track Processing Status #

First, import useState and add a state variable to track if payment processing is active:

import { useState } from 'react';
// ... other existing imports

const PaypalWebview = ({ route }) => {
    const url = route?.params.url ?? '';
    const { setCartPaymentSuccess } = cart.actions;
    const dispatch = useDispatch();
    const [isProcessingPayment, setIsProcessingPayment] = useState(false); // New state

    // ... rest of your existing code
}

Step 2: Update URL Handler to Detect Processing Stage #

Modify your handleUrlChange function to detect when the WebView navigates to PayPal's payment processing pages. Adjust the URL checks to match your actual PayPal flow (log the url value when clicking "Continue" to find the right patterns):

const handleUrlChange = ({ url }) => {
    console.log(url);
    
    // Detect when entering payment processing
    if (url.includes('paypal.com/checkout') || url.includes('processing')) {
        setIsProcessingPayment(true);
        return true;
    }

    // Handle successful payment completion
    if (url.includes('finish')) {
        dispatch(setCartPaymentSuccess());
        navigate('ResultScreen');
        setIsProcessingPayment(false);
        return false;
    }

    // Reset state if navigating back from processing (edge case)
    if (isProcessingPayment && !url.includes('paypal.com/checkout') && !url.includes('processing')) {
        setIsProcessingPayment(false);
    }

    return true;
}

Step 3: Disable the Back Button During Processing #

Update the Pressable component to disable interaction and adjust visual feedback when processing is active:

<Pressable 
    hitSlop={8} 
    onPress={isProcessingPayment ? undefined : cancel}
    style={({ pressed }) => [
        { 
            opacity: isProcessingPayment ? 0.5 : 1,
            pointerEvents: isProcessingPayment ? 'none' : 'auto'
        },
        pressed && !isProcessingPayment ? { opacity: 0.7 } : {}
    ]}
>
    <Icon 
        type="antdesign" 
        name="close" 
        size={14} 
        color={isProcessingPayment ? '#ccc' : 'black'}
        style={{ marginLeft: 20 }}
    />
</Pressable>

Key Notes #

• URL Pattern Adjustment: The URL checks (url.includes('paypal.com/checkout') etc.) are examples. Replace them with the actual URL segments that appear when the user clicks PayPal's "Continue" button (check your console logs for this).
• Visual Feedback: The button's opacity and icon color are adjusted to clearly indicate it's disabled, improving user experience.
• Edge Case Handling: The state resets if the user navigates back from the processing page (though PayPal's flow usually prevents this).

内容的提问来源于stack exchange，提问作者Quang Bình Đinh