How can I retain a local variable that is set in a block?

Question

So I have:

@interface testAppControl : NSObject
{
    NSString *s;
}

and then in my block I want to do

[SendAPI setGroupWithNam         


        

Answer 1

Is not totally clear why and what you want to do so I give you 3 options:

• Declare the variable s outside the block, it will be copied inside automatically inside the block
• If you need to change its value and read it declare it outside the block with the __block specifier, pay attention that if you are changing that var in an async process, the value after the block will be most probably useless
• If you want to keep and change its value during each call to the block decalre it inside the block as static put it will be "visible" only inside the block