需求描述：

因本app是自己测试项目，没有接入支付宝和微信的SDK支付，点击支付按钮时就是传给后台一个订单ID，然后后台接入了支付流程，会直接返回一个URL链接，app调用链接进行网页支付，支付完成后想要拿到支付的状态，从而判断跳转的界面。

第一步：

我们需要传给后台一个订单ID，拿到调起支付宝或者微信支付的网页URL，拿到URL我们app调用

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:htmlStr]];

这个时候能够调起Safari浏览器，我们就可以进行支付了

第二步：

支付完成后，我们会从Safari中返回到app，这个时候需要知道支付是否成功或者失败，这个时候不像app接入支付宝，微信SDK那样，在- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation能够直接拿到支付状态的回调，但我们这里使用的是调起网页支付呀，因此需要另寻途径，拿到回调

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
    if ([url.host isEqualToString:@"safepay"]) {
        // 支付跳转支付宝钱包进行支付，处理支付结果
        [[AlipaySDK defaultService] processOrderWithPaymentResult:url standbyCallback:^(NSDictionary *resultDic) {
            NSLog(@"result = %@",resultDic);
        }];
        
        // 授权跳转支付宝钱包进行支付，处理支付结果
        [[AlipaySDK defaultService] processAuth_V2Result:url standbyCallback:^(NSDictionary *resultDic) {
            NSLog(@"result = %@",resultDic);
            // 解析 auth code
            NSString *result = resultDic[@"result"];
            NSString *authCode = nil;
            if (result.length>0) {
                NSArray *resultArr = [result componentsSeparatedByString:@"&"];
                for (NSString *subResult in resultArr) {
                    if (subResult.length > 10 && [subResult hasPrefix:@"auth_code="]) {
                        authCode = [subResult substringFromIndex:10];
                        break;
                    }
                }
            }
            NSLog(@"授权结果 authCode = %@", authCode?:@"");
        }];
    }else {
        return [WXApi handleOpenURL:url delegate:[WXApiManager sharedManager]];
    }
    return YES;
}

这个时候我们进去AppDelegate.m中会发现有如下两种方法

- (void)applicationWillEnterForeground:(UIApplication *)application {
     NSLog(@"applicationWillEnterForeground----url====%@",application);
    
    // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
}


- (void)applicationDidBecomeActive:(UIApplication *)application {
     NSLog(@"applicationDidBecomeActive----url====%@",application);

    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

这个时候我们可以在调起网页支付的界面加入通知，然后调用一下查询订单状态的接口即可，这样就能知道是否支付成功！

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(becomeActive) name:UIApplicationWillEnterForegroundNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(becomeActive) name:UIApplicationDidBecomeActiveNotification object:nil];
}

- (void)becomeActive{
    if (!self.isDefault) {
        [self orderDetailRequest];//查询订单支付状态
    }
}

这样也有可能其他非支付的地方调用，因此可以加一个isPayJump的BOOL值进行标记。