1，URL Scheme配置问题
question：
'Attempt made to Log in or Like a Tweet without a valid Twitter Kit URL Scheme set up in the app settings. Please see https://dev.twitter.com/twitterkit/ios/installation for more info.'answer1：
I got it too, and you just have to do what it says, you have to add a URL scheme to the info.plist. It is explained in the link.answer2：
The trick was to add the scheme by itself with a new role. Not an issue if it's your first scheme but easy to mess up if you have multiple.
总结：
上面是两个循序渐进的答案：
第一， info.flist里面增加一个 URL scheme；
第二，确保是在现有URL types下增加新的URL scheme，不是新增URL types
如图
参考：
https://twittercommunity.com/t/twitterkit-v3-causes-exception-upon-sign-in-on-ios/88143/2
2， 需要设置Callback URL
- question：
[TwitterKit] did encounter error with message "Error obtaining user auth token.": Error Domain=TWTRLogInErrorDomain Code=-1 "<?xml version="1.0" encoding="UTF-8"?>
<hash>
<error>Desktop applications only support the oauth_callback value 'oob'</error>
<request>/oauth/request_token</request>
</hash>
" UserInfo={NSLocalizedDescription=<?xml version="1.0" encoding="UTF-8"?>
<hash>
<error>Desktop applications only support the oauth_callback value 'oob'</error>
<request>/oauth/request_token</request>
</hash>
}
- answer：
I am facing the same issue as in the question. I have just set the callBack Url into the Twitter App and resolved the issues.
Go to https://apps.twitter.com/app -> Settings -> Callback URL and Update Settings to save.
总结：
必须要设置Callback URL
Callback URL最新格式：
twitterkit-{consumer/api key}://
For example:
twitterkit-128238aKjqlp123AKdasdf://
如果不按照这样设置，会报下面的错误：
Callback URL not approved for this client application. Approved callback URLs can be adjusted in your application settings
参考：
https://stackoverflow.com/questions/40863953/getting-errors-from-twitter-sharedinstance-switf-3-ios-10
