[objC]文字列からインスタンス生成

gistfile1.m

- (id)createWithClassName:(NSString*)title
{
    NSString *className = [NSString stringWithFormat:@"%@ViewController",title];
    Class aClass = NSClassFromString(className);
    id instance  = nil;
    if (aClass) {
        instance = [[aClass alloc]init];
    }
    return instance;
}