Adapt one block type to another, in this case to get rid of commonly unwanted parameters. In this SO answer: http://stackoverflow.com/a/22513387/45813

BlockAdapter.m

@class TKState, TKStateMachine;
typedef void (^LongStateBlock)(TKState *state, TKStateMachine *stateMachine);

static inline LongStateBlock Adapter(void(^block)()) {

    void(^heapBlock)() = [block copy]; // forces block to be on heap rather than stack, a one-time expense

    LongStateBlock longBlock = ^(TKState *s __unused, TKStateMachine *sm __unused) {
        heapBlock();
    };

    // this is the non-ARC, MRR version; I'll leave ARC for the interested observer
    [heapBlock release];
    return [[longBlock copy] autorelease];
}

- (void)takesLongStateBlock:(LongStateBlock)longBlock
{
    if (longBlock) longBlock(nil, nil);
}

- (void)yourRandomMethod
{
    [self takesLongStateBlock:^(TKState *state, TKStateMachine *stateMachine) {
        NSLog(@"Gratuitous paramaters, AAAAHHHH!");
    }];

    [self takesLongStateBlock:Adapter(^{
        NSLog(@"So, so clean.");
    })];

}