ios - why use the "autorelesspool" to define a macro ？

Answer 1

The purpose of defining a macro like this is to add an @ symbol when using it, because the usage of autoreleaasepool is like this:

@autoreleasepool {
}

So using this trick when defining macros will allow you to use it like this when using macros

@weakify(self),
@strongify(self),

As for the redundant @autoreleasepool {}和@try {} @finally {}code introduced by the macro definition, it will be optimized away by the compiler because it does nothing, so it will not have an impact on the final generated code.