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

Declare it as a __block variable, then you can use it outside the block and alter it inside the block.

__block NSString *s = nil;

void(^block)(void) = ^ {
    s = @"something";
};
block();
NSLog(@"%@", s);

s = @"blah";
NSLog(@"%@", s);

block();
NSLog(@"%@", s);