导航栏 setBackgroundImage 不适用于 iOS15

问题描述

- (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 iOS15、XCode13 beta 上，它不再起作用了。

解决方法

OC：

if (@available(iOS 13.0,*)) {
                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;
            }
    

斯威夫特：

    if #available(iOS 13.0,*) {
                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
            }