iOS Blocks - use of undeclared identifier self

Question

I am new to blocks. I am inside a singleton and I do this

void (^ myBlock)() = ^(){ [self doStuff]; };

I receive this error use of undeclared identifier self.

doStuff is a method inside the singleton.

but if this block is declared inside another method, Xcode is OK.

Why is that? thanks.

Answer 1

you can define the block in your interface and initialize in any of your methods (including initializers ) in your @implementation file like below:

@interface YourClass {
   void (^ myBlock)();
}

@implementation YourClass

  - (void)yourMethod {
    myBlock = ^(){ [self doStuff]; };
  }


@end