iOS状态栏、导航栏的一些笔记分享

// 在controller中重写该方法，并返回相应值
- (UIStatusBarStyle)preferredStatusBarStyle {
 
 return UIStatusBarStyleLightContent;
}

// 注意：
// 当controller嵌入UINavigationController中时，controller中的方法preferredStatusBarStyle是不会自动被调用的，而navController中的该方法会被调用；
// 当有navController时，在重写controller中的preferredStatusBarStyle方法同时，我们还应重写navController中的childViewControllerForStatusBarStyle方法。
- (UIViewController *)childViewControllerForStatusBarStyle {
 
 return self.topViewController;
}

// 状态栏内容-黑色
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleDefault;
// 状态栏内容-白色
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;

// iOS 9.0 之前
// 隐藏=YES,显示=NO; Animation:动画效果
[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];

// iOS 9.0 之后推荐使用这个
// 注意：该方法可以通过UIController中的方法setNeedsStatusBarAppearanceUpdate来间接调用
- (BOOL)prefersStatusBarHidden {
 
 return YES;
}

- (UIViewController *)childViewControllerForStatusBarHidden {
 
 return self.topViewController;
}

-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
 [application setStatusBarHidden:NO withAnimation:UIStatusBarAnimationFade];
}

// 隐藏导航栏
//[self.navigationController setNavigationBarHidden:YES];
[self.navigationController setNavigationBarHidden:YES animated:YES];

// 设置导航背景为红色
[self.navigationController.navigationBar setBarTintColor:[UIColor redColor]];

// 设置navigationBar的透明效果
[self.navigationController.navigationBar setTranslucent:YES]; 
//设置导航栏的背景图片
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"imgName"] forBarMetrics:UIBarMetricsDefault];

// Attributes 属性
NSDictionary *textAttributes = @{NSForegroundColorAttributeName:[UIColor whiteColor],NSFontAttributeName:[UIFont systemFontOfSize:30]};
// 设置导航栏标题的字体大小、颜色
[self.navigationController.navigationBar setTitleTextAttributes:textAttributes];

if (@available(iOS 11.0, *)) {
  [self.navigationController.navigationBar setPrefersLargeTitles:YES];
}

-(void)layoutSubviews {
 [super layoutSubviews];
 
 [[NSNotificationCenter defaultCenter] postNotificationName:KEY_UINavigationBar_Height_Changed object:self userInfo:nil];
}

//// 需要导航栏透明的ViewController中
- (void)viewWillAppear:(BOOL)animated {
 
 [super viewWillAppear:animated];
 
 _navView.hidden = NO;
 self.edgesForExtendedLayout = UIRectEdgeTop;
 self.navigationController.navigationBar.translucent = YES;
 [self.navigationController.navigationBar setShadowImage:[UIImage new]];
 [self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
 [self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor whiteColor]}];
}

//// 导航栏为非透明的ViewController中
- (void)viewWillAppear:(BOOL)animated {
 
 [super viewWillAppear:animated];
 
 self.edgesForExtendedLayout = UIRectEdgeNone;
 self.navigationController.navigationBar.translucent = NO;
 [self.navigationController.navigationBar setShadowImage:nil];
 [self.navigationController.navigationBar setTintColor:[UIColor blackColor]];
 [self.navigationController.navigationBar setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];
 [self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor blackColor]}];
}