导航栏setBackgroundImage在iOS15上不起作用

Question

- (void)viewDidLoad {
   [super viewDidLoad];
   [self.navigationController.navigationBar setBackgroundImage:xxx] forBarMetrics:UIBarMetricsDefault];
   [self.navigationController.navigationBar setBarTintColor:[UIColor redColor]];
}

它在iOS14上运行完美。但在XCode13测试版的iOS15上，它不再起作用了。

Answer 1

OC：

if (@available(iOS 15.0, *)) {
    UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
    [appearance configureWithOpaqueBackground];
    appearance.backgroundColor = [UIColor whiteColor];
    appearance.shadowColor = [UIColor whiteColor];
    appearance.shadowImage = [UIImage imageWithColor:[UIColor whiteColor]];
    self.navigationController.navigationBar.standardAppearance = appearance;
    self.navigationController.navigationBar.scrollEdgeAppearance = self.navigationController.navigationBar.standardAppearance;
}

Swift：

if #available(iOS 15.0, *) {
    let appearance = UINavigationBarAppearance()
    appearance.configureWithOpaqueBackground()
    appearance.backgroundColor = .white
    appearance.shadowColor = .white
    appearance.shadowImage = UIImage.color(.white)
    navigationController?.navigationBar.standardAppearance = appearance
    navigationController?.navigationBar.scrollEdgeAppearance = navigationController?.navigationBar.standardAppearance
}

Answer 2

只需使用此代码，背景图像就可以在iOS 15中工作

if (@available(iOS 13.0, *)) {
  UINavigationBarAppearance *navigationBarAppearance = [UINavigationBarAppearance new];
  [navigationBarAppearance configureWithOpaqueBackground];
  [navigationBarAppearance setBackgroundImage:image];
  self.navigationController.navigationBar.scrollEdgeAppearance = navigationBarAppearance;
  self.navigationController.navigationBar.standardAppearance = navigationBarAppearance;
}

Answer 3

swift：

if #available(iOS 15.0, *) {
        let appearance = UINavigationBarAppearance()
        appearance.configureWithTransparentBackground()
        appearance.backgroundImage = image
        navigationController?.navigationBar.standardAppearance = appearance
        navigationController?.navigationBar.scrollEdgeAppearance = navigationController?.navigationBar.standardAppearance
    }else{
        self.navigationController?.navigationBar.setBackgroundImage(image, for: .default)
    }