以编程方式将导航栏添加到tableviewController(segue push或modal)

Question

我正在尝试以编程方式将navigationBar添加到tableViewController:

当我来自PUSH Segue时,构建器会添加一个带导航项的导航栏,就像我想要的那样.

但问题是,当我来自一个MODAL Segue时,我尝试添加一个代码如下:

UINavigationBar *naviBarObj = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, -260, 320, 44)];
[self.view addSubview:naviBarObj];
UIBarButtonItem *cancelItem = [[UIBarButtonItem alloc] initWithTitle:@"Cancel"         style:UIBarButtonItemStyleBordered target:self action:@selector(cancelButtonPressed)];
UIBarButtonItem *doneItem = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleBordered target:self action:@selector(doneButtonPressed)];

UINavigationItem *navigItem = [[UINavigationItem alloc] initWithTitle:@"Navigation Title"];
navigItem.rightBarButtonItem = doneItem;
navigItem.leftBarButtonItem = cancelItem;
naviBarObj.items = [NSArray arrayWithObjects: navigItem,nil];

....

- (void) cancelButtonPressed { }
- (void) doneButtonPressed { }

但没有出现......没有顶栏.

Answer 1

naviBarObj 的帧 ypoint 是 -260，也许这没有显示任何内容。