当我尝试将手机添加为Onesignal的订户时，我总是收到很多错误。经过一番谷歌搜索后，我发现通过添加如下代码可以解决很多类似的问题：

    <key>NSAppTransportSecurity</key>
    <dict>
        <key>NSExceptionDomains</key>
        <dict>
            <key>yourdomain.com</key>
            <dict>
                <!--Include to allow subdomains-->
                <key>NSIncludesSubdomains</key>
                <true/>
                <!--Include to allow HTTP requests-->
                <key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key>
                <true/>
                <!--Include to specify minimum TLS version-->
                <key>NSTemporaryExceptionminimumTLSVersion</key>
                <string>TLSv1.1</string>
            </dict>
        </dict>
    </dict>
    <key>NSAppTransportSecurity</key>
    <dict>
         <key>NSAllowsArbitraryLoads</key><true/>
    </dict>

到info.plist文件，但这没有帮助。这是我遇到的错误：

2020-01-20 18:11:42.247177-0500 Vocks[725:200745] 6.15.0 - [Firebase/Analytics][I-ACS023012] Analytics collection enabled
2020-01-20 18:11:42.583343-0500 Vocks[725:200741] [] tcp_output [C2.1.1:2] flags=[R.] seq=733742495,ack=1645995697,win=1026 state=CLOSED rcv_nxt=1645995697,snd_una=733742495
2020-01-20 18:11:42.587095-0500 Vocks[725:200741] Connection 2: received failure notification
2020-01-20 18:11:42.587812-0500 Vocks[725:200741] Connection 2: encountered error(3:-9816)
2020-01-20 18:11:42.588868-0500 Vocks[725:200741] [] nw_connection_copy_connected_local_endpoint [C2] Connection has no connected path
2020-01-20 18:11:42.588911-0500 Vocks[725:200741] [] nw_connection_copy_connected_remote_endpoint [C2] Connection has no connected path
2020-01-20 18:11:42.605280-0500 Vocks[725:200741] Task <C1511226-D971-43C3-B953-A6BBA2EA9C7E>.<1> HTTP load failed,0/0 bytes (error code: -1200 [3:-9816])
2020-01-20 18:11:42.610239-0500 Vocks[725:200751] Task <C1511226-D971-43C3-B953-A6BBA2EA9C7E>.<1> finished with error [-1200] Error Domain=nsurlerrordomain Code=-1200 "An SSL error has occurred and a secure connection to the server cannot be made." UserInfo={_kCFStreamErrorCodeKey=-9816,NSLocalizedRecoverySuggestion=Would you like to connect to the server anyway?,NSUnderlyingError=0x281f748a0 {Error Domain=kCFErrorDomainCFNetwork Code=-1200 "(null)" UserInfo={_kCFStreamPropertySSLClientCertificateState=0,_kCFNetworkCFStreamSSLErrorOriginalValue=-9816,_kCFStreamErrorDomainKey=3,_kCFStreamErrorCodeKey=-9816}},NSLocalizedDescription=An SSL error has occurred and a secure connection to the server cannot be made.,NSErrorFailingURLKey=https://onesignal.com/api/v1/players,NSErrorFailingURLStringKey=https://onesignal.com/api/v1/players,_kCFStreamErrorDomainKey=3}
2020-01-20 18:11:42.612812-0500 Vocks[725:200741] [] tcp_output [C1.1.1:2] flags=[R.] seq=2887753815,ack=4287215693,win=1026 state=CLOSED rcv_nxt=4287215693,snd_una=2887753815
2020-01-20 18:11:42.615102-0500 Vocks[725:200741] Connection 1: received failure notification
2020-01-20 18:11:42.616483-0500 Vocks[725:200741] Connection 1: encountered error(3:-9816)
2020-01-20 18:11:42.617395-0500 Vocks[725:200741] [] nw_connection_copy_connected_local_endpoint [C1] Connection has no connected path
2020-01-20 18:11:42.617629-0500 Vocks[725:200741] [] nw_connection_copy_connected_remote_endpoint [C1] Connection has no connected path
2020-01-20 18:11:42.626253-0500 Vocks[725:200741] Task <05DFC145-162F-46B7-BA80-66849A234A6C>.<1> HTTP load failed,0/0 bytes (error code: -1200 [3:-9816])
2020-01-20 18:11:42.626950-0500 Vocks[725:200745] Task <05DFC145-162F-46B7-BA80-66849A234A6C>.<1> finished with error [-1200] Error Domain=nsurlerrordomain Code=-1200 "An SSL error has occurred and a secure connection to the server cannot be made." UserInfo={_kCFStreamErrorCodeKey=-9816,NSUnderlyingError=0x281f573f0 {Error Domain=kCFErrorDomainCFNetwork Code=-1200 "(null)" UserInfo={_kCFStreamPropertySSLClientCertificateState=0,NSErrorFailingURLKey=https://onesignal.com/api/v1/apps/b200505d-d94c-4609-ae5f-247ec23da5b9/ios_params.js,NSErrorFailingURLStringKey=https://onesignal.com/api/v1/apps/b200505d-d94c-4609-ae5f-247ec23da5b9/ios_params.js,_kCFStreamErrorDomainKey=3}