微信分享时平台的选择

由于现在新增加了微信登录功能，所以微信初始化方法需要改一下：

改成如下接口
             [ShareSDK connectWeChatWithAppId: @"wx4868b35061f87885"
                                                          appSecret: @"64020361b8ec4c99936c0e3999a9f249"
                                                                                    wechatCls: [WXApi class]];

注意这个初始化是微信总的初始化，初始完成后，微信好友，微信朋友圈，微信收藏就都开启了，也就是在分享菜单那里就都有图标显示了。

当然您也可以分开初始化微信的这三个平台
微信好友：
         [ShareSDK connectWeChatSessionWithAppId: @"wx4868b35061f87885" 
                                                                  appSecret: @"64020361b8ec4c99936c0e3999a9f249" 
                                                                  wechatCls: [WXApi class]];
微信朋友圈：
       [ShareSDK connectWeChatTimelineWithAppId: @"wx4868b35061f87885" 
                                                                  appSecret: @"64020361b8ec4c99936c0e3999a9f249" 
                                                                  wechatCls: [WXApi class]];
微信收藏：
       [ShareSDK connectWeChatFavWithAppId: @"wx4868b35061f87885" 
                                                         appSecret: @"64020361b8ec4c99936c0e3999a9f249" 
                                                         wechatCls: [WXApi class]];