實現原理，判斷是否是有alipays://或者alipay://,如果有，就直接呼叫
[[UIApplication sharedApplication]openURL:request.URL];

OC程式碼

-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
    NSString* reqUrl = request.URL.absoluteString;
    if
 
 ([reqUrl hasPrefix:@"alipays://"] || [reqUrl hasPrefix:@"alipay://"]) {
        BOOL bSucc = [[UIApplication sharedApplication]openURL:request.URL];
        //bSucc是否成功調起支付寶
        if (!bSucc) {
            NSLog(@"呼叫失敗");
            return NO;
        }
    }
    return YES;
}

Swift程式碼

func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType)
 
 -> Bool {
        let reqUrl = request.url?.absoluteString
        if ((reqUrl?.hasPrefix("alipays://"))! || (reqUrl?.hasPrefix("alipay://"))!)
        {
            let bSucc:Bool = UIApplication.shared.openURL(request.url!)
            if !bSucc {
                print("呼叫失敗")
                return
 
 false
            }
        }
        return true
    }