UIButton *releaseButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

        [releaseButton setTitle:@"发布" forState:normal];

        [releaseButton addTarget:self action:@selector(releaseInfo:) forControlEvents:UIControlEventTouchUpInside];

        UIBarButtonItem *releaseButtonItem = [[UIBarButtonItem alloc] initWithCustomView:releaseButton];

        self.navigationItem.rightBarButtonItem = releaseButtonItem;