場景描述：
公司的APP主要通過WKWebView調用wap頁面往果，里面有支付寶支付。點擊立即支付草丧，如果手機裝有支付寶腋寨，應該打開支付寶客戶端的。問題是扼菠，Android截獲URL跳轉是沒有問題的摄杂，但是iOS卻有問題。無法打開客戶端還是停留支付寶wap頁面循榆。一直調試考慮如何解決這個問題析恢，還是同事點子多，結合了Android和iOS重新拼接URL秧饮，然后open映挂，就可以了，能想到這種法子盗尸，實在是佩服柑船。
以下為參考代碼：

//在發(fā)送請求之前，決定是否跳轉  如果不實現(xiàn)這個代理方法,默認會屏蔽掉打電話等url
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler{
  NSString *url = [navigationAction.request.URL.absoluteString stringByRemovingPercentEncoding];
    NSString* reUrl=[[webView URL] absoluteString];
    if ([url containsString:kBaseUrl]) {
        reUrl=url;
    }
    
    if ([url containsString:@"alipay://"]) {
        //        alipay://alipayclient/?{"dataString":"h5_route_token=\"5ca0bf28bad7cdb27e9069853cfb67d7\"&is_h5_route=\"true\"","requestType":"SafePay","fromAppUrlScheme":"alipays"}
        NSString* dataStr=[url substringFromIndex:23];
        NSLog(@"%@",dataStr);
        NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:[dataStr dataUsingEncoding:NSUTF8StringEncoding] options:kNilOptions error:nil];
        //appId=20000125&orderSuffix=h5_route_token%3D%22ba8f51bce235fe3b02f945da619125e5%22%26is_h5_route%3D%22true%22#Intent
        NSMutableString* mString=[[NSMutableString alloc] init];
        [mString appendString:@"alipays://platformapi/startApp?appId=20000125&orderSuffix="];
        //        [mString appendString:@"alipay://alipayclient/?appId=20000125&orderSuffix="];
      //url進行編碼
        [mString appendString:[self encodeString:dict[@"dataString"]]];
        //        alipays://platformapi/startApp?appId=20000125&orderSuffix=h5_route_token=\"5f941ada4bcb49832562e7289dce72ee\"&is_h5_route=\"true\""
        
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:mString]];
        decisionHandler(WKNavigationActionPolicyAllow);
        return;
    }
}

-(NSString*)encodeString:(NSString*)unencodedString{
    
    // CharactersToBeEscaped = @":/?&=;+!@#$()~',*";
    
    // CharactersToLeaveUnescaped = @"[].";
    
    NSString *encodedString = (NSString *)
    
    CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
                                                              
                                                              (CFStringRef)unencodedString,
                                                              
                                                              NULL,
                                                              
                                                              (CFStringRef)@"!*'();:@&=+$,/?%#[]",
                                                              
                                                              kCFStringEncodingUTF8));
    
    return encodedString;
    
}

雖然可以打開測試沒有問題泼各，但是還是覺得可能會有其他問題鞍时，如果哪位兄弟姐妹遇到過類似問題，希望指教扣蜻。

后來又嘗試通過iOS返回的URL逆巍，但是對參數(shù)進行編碼，也可以莽使，提出疑問锐极，為啥iOS本身的URL或者用Android的URL都可以打開iOS端的支付寶：

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler{

    NSString *url = [navigationAction.request.URL.absoluteString stringByRemovingPercentEncoding];
    NSString* reUrl=[[webView URL] absoluteString];
    if ([url containsString:kBaseUrl]) {
        reUrl=url;
    }
    
    if ([url containsString:@"alipay://"]) {
 NSInteger subIndex = 23;
        NSString* dataStr=[url substringFromIndex:subIndex];
        //編碼
        NSString *encodeString = [self encodeString:dataStr];
        NSMutableString* mString=[[NSMutableString alloc] init];
        [mString appendString:[url substringToIndex:subIndex]];
        [mString appendString:encodeString];
        
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:mString]];
        decisionHandler(WKNavigationActionPolicyAllow);
        return;
    }