• 在本app打开其他app的时候，会调用一个共享类的对象方法是

[[UIApplication sharedApplication] canOpenURL:url];

如果返回yes，系统允许打开，才能分享调用成功，进行分享等接下来的一系列操作，所以需要告诉系统本APP可以打开哪些其他app，方法是在plist文件里(与系统沟通的配置文件)添加其他app的名单

<key>LSApplicationQueriesSchemes</key>
<array>
    <!-- 微信 URL Scheme 白名单-->
    <string>wechat</string>
    <string>weixin</string>

    <!-- 新浪微博 URL Scheme 白名单-->
    <string>sinaweibohd</string>
    <string>sinaweibo</string>
    <string>sinaweibosso</string>
    <string>weibosdk</string>
    <string>weibosdk2.5</string>

    <!-- QQ、Qzone URL Scheme 白名单-->
    <string>mqqapi</string>
    <string>mqq</string>
    <string>mqqOpensdkSSoLogin</string>
    <string>mqqconnect</string>
    <string>mqqopensdkdataline</string>
    <string>mqqopensdkgrouptribeshare</string>
    <string>mqqopensdkfriend</string>
    <string>mqqopensdkapi</string>
    <string>mqqopensdkapiV2</string>
    <string>mqqopensdkapiV3</string>
    <string>mqqopensdkapiV4</string>
    <string>mqzoneopensdk</string>
    <string>wtloginmqq</string>
    <string>wtloginmqq2</string>
    <string>mqqwpa</string>
    <string>mqzone</string>
    <string>mqzonev2</string>
    <string>mqzoneshare</string>
    <string>wtloginqzone</string>
    <string>mqzonewx</string>
    <string>mqzoneopensdkapiV2</string>
    <string>mqzoneopensdkapi19</string>
    <string>mqzoneopensdkapi</string>
    <string>mqqbrowser</string>
    <string>mttbrowser</string>
    <string>tim</string>
    <string>timapi</string>
    <string>timopensdkfriend</string>
    <string>timwpa</string>
    <string>timgamebindinggroup</string>
    <string>timapiwallet</string>
    <string>timOpensdkSSoLogin</string>
    <string>wtlogintim</string>
    <string>timopensdkgrouptribeshare</string>
    <string>timopensdkapiV4</string>
    <string>timgamebindinggroup</string>
    <string>timopensdkdataline</string>
    <string>wtlogintimV1</string>
    <string>timapiV1</string>

</array>

• 那么告诉系统哪些可以打开，那么打开app后如果返回本app怎么实现呢，这里就用到URL types,在plist文件里输入URL types,告诉系统本app不同的id，在返回的时候系统依据注册的信息就可找到本app