"completion" is a block with return type void which has a parameter of type BOOL. A user could pass nil instead of block, so we need to check if block is supplied before invoke it.

08.08.14 10:45, User Mac wrote:
- (void)dismissAnimated:(BOOL)animated completion:(void(^)(BOOL 
finished))completion
{
        void(^completionBlock)(BOOL) = ^(BOOL finished){
                [self somefunction];
                
                if(completion)
                {
                        completion(finished);
                }
        };
…………
………...
}


I want to know what type of “completion",is it boolean or block? Why use “if” to 
judge “completion"? And what is the result of code”completion(finished)”.
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