在ios15导航条颜色失效

if (@available(iOS 15.0, *)) {
    UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
    appearance.backgroundColor = [UIColor colorWithHexString:@"#F8F8F8"]; //背景色
    appearance.shadowColor = UIColor.clearColor; //阴影
    self.navigationController.navigationBar.standardAppearance = appearance;
    self.navigationController.navigationBar.scrollEdgeAppearance = appearance;
}

或
AppDelegate - didFinishLaunchingWithOptions新增

if (@available(iOS 13.0, *)) {
    UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
    appearance.backgroundColor = [UIColor colorWithHexString:@"#F8F8F8"]; //背景色
    appearance.shadowColor = UIColor.clearColor; //阴影
    [[UINavigationBar appearance] setStandardAppearance:appearance];
    [[UINavigationBar appearance] setScrollEdgeAppearance:appearance];

}