System method failure of Appdelegate in iOS runtime Hook system

according to the runtime hook technology shared by the online gods, I want to do it myself

< H2 > principle: intercept the ViewDidiLoad method of the controller, and realize the method exchange. The effect is obvious and effective < / H2 >.

as shown in the figure:

:

< H2 > thought hard, but I couldn"t figure it out. Just want to know why, is the problem of the system, or my above code is wrong. All I want is to verify < / H2 >
Mar.02,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e3386d-4423b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e3386d-4423b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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