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]];
}

在iOS14上完美运行。但在iOS15、XCode13 beta上，它不再起作用了。

Answer 1

超频：

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;
}
    

迅速：

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

迅速：

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)
    }