- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    
    NSURLRequest *request        = navigationAction.request;
    NSString     *scheme         = [request.URL scheme];
    // decode for all URL to avoid url contains some special character so that it wasn't load.
    NSString     *absoluteString = [navigationAction.request.URL.absoluteString stringByRemovingPercentEncoding];
    NSLog(@"Current URL is %@",absoluteString);
    static NSString *endPayRedirectURL = nil;
    
    // 跳转到本地某宝App
    if ([absoluteString hasPrefix:@"alipays://"] || [absoluteString hasPrefix:@"alipay://"])
    {
        NSURL *openedURL = navigationAction.request.URL;
        
        NSString *prefixString = @"alipay://alipayclient/?";
        NSString *urlString = [[self sht_URLDecodedString:absoluteString] stringByReplacingOccurrencesOfString:@"alipays" withString:@"jxtapp://"];
        ;
        if ([urlString hasPrefix:prefixString]) {
            NSRange rang = [urlString rangeOfString:prefixString];
            NSString *subString = [urlString substringFromIndex:rang.length];
            NSString *encodedString = [prefixString stringByAppendingString:[self sht_URLEncodedString:subString]];
            openedURL = [NSURL URLWithString:encodedString];
        }
        BOOL isSucc = [[UIApplication sharedApplication] openURL:openedURL];
        if (!isSucc) {
            [ToastShow showErrorMessage:@"未安装支付宝，请选择其他验证方式！"];
        }
        decisionHandler(WKNavigationActionPolicyCancel);
        return;
    }
    
    decisionHandler(WKNavigationActionPolicyAllow);
}
 
- (NSString *)sht_URLDecodedString:(NSString *)urlString
{
    NSString *string = urlString;
    NSString *decodedString=(__bridge_transfer NSString *)CFURLCreateStringByReplacingPercentEscapesUsingEncoding(NULL, (__bridge CFStringRef)string, CFSTR(""), CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding));
    return decodedString;
}
 
- (NSString *)sht_URLEncodedString:(NSString *)urlString
{
    NSString *string = urlString;
    NSString *encodedString = (NSString *) CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
                                                                                                     (CFStringRef)string,
                                                                                                     NULL,
                                                                                                     (CFStringRef)@"!*'();:@&=+$,/?%#[]",
                                                                                                     kCFStringEncodingUTF8));
    return encodedString;
}

原文链接：https://blog.csdn.net/SHTLoveXX/article/details/108469266