ios - 为自定义 UINavigationBar 设置委托(delegate)

Question

我正在尝试从我的 navigationBar 添加自定义元素，包括下拉菜单和 View 更改，因此我需要一个自定义元素。但是，当尝试将委托(delegate)设置为我的 View Controller 时，它会引发错误。

@interface MyViewController : UIViewController <MyCustomNavigationBarDelegate>

@implementation MyViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    UINavigationController *nav = [[UINavigationController alloc] initWithNavigationBarClass:[MyCustomNavigationBar class] toolbarClass:[UIToolbar class]];
    nav.navigationBar.assessmentDelegate = self;
}

最后一行抛出错误 Property 'assessmentDelegate' not found on object of type 'UINavigationBar *' However it should be type of class MyCustomNavigationBar 显然有委托(delegate):

@protocol MyCustomNavigationBarDelegate;

@interface MyCustomNavigationBar : UINavigationBar

@property (weak, nonatomic) id <MyCustomNavigationBarDelegate> assessmentDelegate;

@end

@protocol MyCustomNavigationBarDelegate <NSObject>

-(void)presentViewController:(UIAlertController *)alert;

@end

Answer 1

将您的导航栏转换到底部导航栏

MyCustomNavigationBar  *switchNav = (MyCustomNavigationBar *)nav.navigationBar;
switchNav.assessmentDelegate = self