objective-c - 如何使用自定义 UINavigationBar

Question

我有 UINavigationBar 的子类。

@interface MyNavigationBar : UINavigationBar

进行了一些更改，现在希望我的应用程序 NavigationController 使用它:

 _navigationController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
 [_window addSubview:[_navigationController view]];
[self.window makeKeyAndVisible];

我希望 _navigationController 有 MyNavigationBar

如何做到这一点？

谢谢。

Answer 1

您必须创建一个带有 UINavaigationController 的 xib。然后，您可以在 Interface Builder 中选择 navigationBar，并将类更改为 UINavigationBar 的子类。

然后为了让它更容易实例化，我向`UINavigationController 添加了一个类别，例如:

@interface UINavigationController (DSCNavigationController)

+ (UINavigationController *)dsc_navigationControllerWithRootViewController:(UIViewController *)rootViewController;

@end

@implementation UINavigationController (DSCNavigationController)

+ (UINavigationController *)dsc_navigationControllerWithRootViewController:(UIViewController *)rootViewController;
{
    NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"DSCNavigationController" owner:nil options:nil];

    NSAssert(1 == [topLevelObjects count], @"DSCNavigationController should have one top level object");

    UINavigationController *navigationController = [topLevelObjects objectAtIndex:0];

    NSAssert([navigationController isKindOfClass:[UINavigationController class]], @"Should have a UINavigationController");

    [navigationController pushViewController:rootViewController animated:NO];

    return navigationController;
}

@end

在使用它的类的顶部确保在我的例子中导入类别

#import "UINavigationController+DSCNavigationController"

然后使用它看起来像

MyViewController *myViewController = [[MyViewController  alloc] init];
UINavigationController *navigationController = [UINavigationController dsc_navigationControllerWithRootViewController:myViewController];