iOS：在 UINavigationBar 下方添加 UIView

Question

如果我尝试使用以下代码向自定义 UINavigationController 中的导航栏添加视图：

- (void)viewDidLoad {

        [super viewDidLoad];
        self.sv = (MyCustomView *)[[[NSBundle mainBundle]loadNibNamed:@"MyCustomView" owner:self options:nil] objectAtIndex:0];
        self.sv.frame = CGRectMake(self.navigationBar.frame.origin.x, self.navigationBar.frame.size.height, self.navigationBar.frame.size.width, heightOfMyCustomView);
        [self.navigationBar addSubview:self.sv];
    }

和

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    [super pushViewController:viewController animated:animated];
    viewController.view.frame = CGRectMake(viewController.view.frame.origin.x, viewController.view.frame.origin.y + heightOfMyCustomView, viewController.view.frame.size.width, viewController.view.frame.size.height - heightOfMyCustomView);
}

当我推动控制器时，控制器视图的顶部被我添加到导航栏的自定义视图隐藏。 如何将控制器的视图放在自定义视图下方？

Answer 1

我还建议查看 UINavigationItem.titleView 属性，它使您能够为导航栏标题区域提供视图。

Answer 2

在您的自定义 UINavigationController 初始化方法中，将委托分配给自身，如下所示：

CustomeNavCtrl.m 文件：

@implementation CustomeNavCtrl

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        self.delegate = self;
    }
    return self;
}

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
    //Todo:viewController.view layout
    //Todo:send MyCustomView to back or something other you like.
}

CustomeNavCtrl.h 文件：

 @interface CustomeNavCtrl : UINavigationController<UINavigationControllerDelegate> {

 }