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For iOS, if your application wants to be opened by other applications, it needs to register the URL Scheme with the system. Some callback operations can be implemented in handleOpenURL in AppDelete. SMS applications like the system can respond to schemes like sms://.
But I don’t know if the 來自XXAPP information that the poster mentioned can be customized in the URL.

To access the SDK from WeChat, you must first apply for APPKEY on the open platform, and at the same time, the packagename and informationurl are corresponding.

So what WeChat needs to do after clicking wechatsdkdemo is to detect whether the package is installed. If it is installed, open the package. If it is not installed, open the informationurl.