Detailed explanation of the status bar and example code for IOS click button to hide

@interface SecondViewController ()
@property (nonatomic, assign,getter=isHideStatus) BOOL hideStatus;
@end

@implementation SecondViewController

- (void)viewDidLoad {
  [super viewDidLoad];
   = [UIColor whiteColor];

  UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 300, 200)];
   = ;
   = [UIColor blueColor];
  [button setTitle:@"Hide navigation bar" forState:UIControlStateNormal];
  [button addTarget:self action:@selector(hideFrame) forControlEvents:UIControlEventTouchUpInside];
  [ addSubview:button];

   = [UIApplication sharedApplication].statusBarHidden;

  // Do any additional setup after loading the view, typically from a nib.
}


- (void)hideFrame {

  [self setNeedsStatusBarAppearanceUpdate];//After calling this method, the system will call the prefersStatusBarHidden method   = !;

}
- (BOOL)prefersStatusBarHidden
{
  return ;
}