Info.plist文件新增字段如下：
<key>LSApplicationQueriesSchemes</key>
<array>
<string>weixin</string>
<string>wechat</string>
</array>
<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>
原文：http://my.oschina.net/u/2392723/blog/526446