Resolving circular references that may be caused by a block weak reference

1.__weak typeof (self) myself = self;

2.__weak Recommendviewcontroller *RECOMMENDVC = self;

The above two kinds of writing is an effect

typeof (Self) is the type that gets to self, so that the definition of weakself is a type of self, plus __weak is to create a reference, the whole sentence is to self define a reference to the nature of the alias;
This is generally used when using block, because the block will copy its internal variables, may cause a reference loop, using the __weak nature of self instead of self, you can cut off the block reference to self, avoid circular reference

Resolving circular references that may be caused by a block weak reference