The Xcode object has a value when it is printed, but the breakpoint debugging has no value. What is going on?
Set the optimization level corresponding to the scheme to None.
Xcode failed to compile (build failed) but no error was reported
NSZombieEnabled, a way to solve the EXC_BAD_ACCESS error
Menu Product -> Edit Scheme-> Arguments, then click the "plus sign", add the NSZombieEnabled parameter to the Environment Variables window, and write "YES" for the subsequent value.
How to view the sandbox path on iPhone
https://blog.csdn.net/hao1413397706/article/details/54715164