向UINavigationController添加自定义视图

Question

我有一个UINavigationController当事件被触发时我需要一个自定义UIView出现在它下方NavigationBar,但不会阻碍当前ViewController.我还需要在执行UIView控制器时弹出/推送持久性.

 -----------------
|   Status Bar    |
 -----------------
|     Nav Bar     |
 -----------------
|   Custom View   |
 -----------------
|                 |
| View Controller |
|                 |
 -----------------

我正在CustomView (UIView)设置框架,如:

- (id)initWithNavigationController:(UINavigationController *)navController {
    self.navController = navController;
    return [self init];
}

- (id)init
{
    CGRect viewFrame = self.navController.view.frame;

    return [self initWithFrame:CGRectMake(viewFrame.origin.x,
                                      self.navController.navigationBar.frame.origin.y + self.navController.navigationBar.frame.size.height,
                                      viewFrame.size.width,
                                      40.0)];
}

这是怎么回事？

Answer 1

- (id)initWithNavigationController:(UINavigationController *)navController {
    CGRect viewFrame = navController.view.frame;

    if (self = [super initWithFrame:CGRectMake(viewFrame.origin.x,
                                      navController.navigationBar.frame.origin.y + navController.navigationBar.frame.size.height,
                                      viewFrame.size.width,
                                      40.0)]){
       self.navController = navController;
      }
    return self;
   }

然后

CustomView* _myCustomView = [[CustomView alloc] initWithNavigationController:navigationController];
[navigationcontroller.view addSubview:_myCustomView];