iOS 之 导航栏按钮

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;