//在要改变的类里面添加下面代码
- (UIStatusBarStyle)preferredStatusBarStyle{
    return UIStatusBarStyleLightContent;
}
//创建一个继承UINavigationController的Category扩展类添加childViewControllerForStatusBarStyle和childViewControllerForStatusBarHidden两个方法即可
#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface UINavigationController (StatusBarStyle)

@end

NS_ASSUME_NONNULL_END


#import "UINavigationController+StatusBarStyle.h"

@implementation UINavigationController (StatusBarStyle)
- (UIViewController *)childViewControllerForStatusBarStyle{
    return self.visibleViewController;
}
- (UIViewController *)childViewControllerForStatusBarHidden{
    return self.visibleViewController;
} 
@end