Invoke a block using NSInvocation

block-invoke.m

#import <Foundation/Foundation.h>

int main(int argc, char **argv)
{
    @autoreleasepool
    {
        void (^testBlock)(NSString *test) =
        ^(NSString *test)
        {
            NSLog(@"%@", test);
        };

        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[NSMethodSignature signatureWithObjCTypes:"v@?@"]];
        [invocation setTarget:testBlock];
        NSString *test = @"Hello, World!";
        [invocation setArgument:&test atIndex:1];

        [invocation invoke];
    }

    return 0;
}