UINavigationController的title添加点击事件

- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    self.view.backgroundColor = [UIColor greenColor];    // 首先定义一个Button    UIButton * button = [UIButton buttonWithType:(UIButtonTypeRoundedRect)];    // 添加 按钮名字    [button setTitle:@"点击" forState:(UIControlStateNormal)];    // 添加点击方法    [button addTarget:self action:@selector(actionButton) forControlEvents:(UIControlEventTouchUpInside)];    // 自适应大小    [button sizeToFit];    // 添加到 表头 title    self.navigationItem.titleView = button;}// 实现点击方法- (void)actionButton{    NSLog(@"我是表头, 点击我");}