iOS 状态栏和导航栏的隐藏和显示

设置 Info.plist View controller-based status bar appearance为YES。
添加4个按钮，分别控制状态栏和导航栏的隐藏和显示。
重写方法 prefersStatusBarHidden。

//
//  SecondViewController.m
//  StatusBar
//
//  Created by chen.cy on 2021/9/28.
//

#import "SecondViewController.h"
@interface SecondViewController (){
    BOOL hiddenStatusBar;
}

@end

@implementation SecondViewController

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    self.navigationController.navigationBarHidden = YES;
}

- (IBAction)pop:(id)sender {
    [self.navigationController popViewControllerAnimated:YES];
}

- (IBAction)hiddenStatusBar:(id)sender {
    hiddenStatusBar = YES;
    [self setNeedsStatusBarAppearanceUpdate];
}


- (IBAction)showStatusBar:(id)sender {
    hiddenStatusBar = NO;
    [self setNeedsStatusBarAppearanceUpdate];
}


- (BOOL)prefersStatusBarHidden{
    return hiddenStatusBar;
}

- (IBAction)hiddenNavigationBar:(id)sender {
    [self.navigationController setNavigationBarHidden:YES animated:NO];
}

- (IBAction)showNavigationBar:(id)sender {
    [self.navigationController setNavigationBarHidden:NO animated:NO];
}

@end

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