IOS 9.0之后要使用

- (BOOL)application:(UIApplication *)app 
                openURL:(NSURL *)url 
options:(NSDictionary<UIApplicationOpenURLOptionsKey, id> *)options

IOS 9.0之前

- (BOOL)application:(UIApplication *)application 
                openURL:(NSURL *)url 
  sourceApplication:(nullable NSString *)sourceApplication 
              annotation:(nonnull id)annotation

上面的兩個(gè)方法沒問題，微信支付還不走回調(diào)原因可能是使用了微信最新的UniversalLink 方式而不是以前的URL schemes，需要加上下面的這個(gè)代理方法。

- (BOOL)application:(UIApplication *)application 
continueUserActivity:(NSUserActivity *)userActivity 
restorationHandler:(void(^)(NSArray<id<UIUserActivityRestoring>> * __nullable restorableObjects))restorationHandler {
    return [WXApi handleOpenUniversalLink:userActivity delegate:self];
}