IOS white list problem, like Alipay, what about the white list of their app?

  ios, question

As we all know, iOS whitelist needs to add scheme to info.plist to jump out
However, how do apps like Alipay, QQ and WeChat operate when others jump over and jump back?

1. the white list is just canOpenUrl. check whether APP is installed or not. these jumps you mentioned call openUrl directly.
2. The jump url splices many fields (rules defined in advance by each APP), such as callBack information, so that you can call back and grab the package to look at the Url.