Notify a target with the specified arguments only if it responds to a selector.

SafelyMessageTarget.m

- (void)safelyMessageTarget:(id)target withSelector:(SEL)selector arguments:(NSArray *)arguments {
    if ([target respondsToSelector:selector]) {
        NSMethodSignature *methodSignature = [NSMethodSignature methodSignatureForSelector:selector];
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:methodSignature];
       
        [arguments enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
            [invocation setArgument:(__bridge void *)(obj) atIndex:idx];
        }];
        
        [invocation invokeWithTarget:target];
    }
}