IOS 15 适配（没有适配会变成白色）

自定义UINavigationController

 关键代码：

1、设置颜色

NSDictionary *dict = @{NSForegroundColorAttributeName: [UIColor whiteColor],NSFontAttributeName:[UIFont systemFontOfSize:18.0]};//统一uinavigationbar 样式

    if (@available(iOS 15.0, *)) {

        UINavigationBarAppearance *barApp = [UINavigationBarAppearance new];

        barApp.backgroundColor = [UIColor navigationbarColor];

        barApp.titleTextAttributes = dict;

        self.navigationBar.scrollEdgeAppearance = barApp;

        self.navigationBar.standardAppearance = barApp;

    }else{

        [self.navigationBar setTitleTextAttributes:dict];

    }

     [self.navigationBar setTintColor:[UIColor whiteColor]];

    self.navigationBar.translucent = NO;

    [self.navigationBar setBarTintColor:[UIColor navigationbarColor]];

2.设置背景图片之类​​​​​​​

        UIImage *backgroundImage = [UIImage imageNamed:@"gzr1.jpg"];

        UIImage *symbolImage = [UIImage imageNamed:@"symbol"];

        NSString *titleString = @"XXXXXXXXXX";

        UIImage *combineImage = [self addImage:backgroundImage byImage:symbolImage title:titleString];

    if (@available(iOS 15.0, *)) {

        UINavigationBarAppearance *barApp = [UINavigationBarAppearance new];

        [barApp setBackgroundImage:backImage];

        self.navigationBar.scrollEdgeAppearance = barApp;

        self.navigationBar.standardAppearance = barApp;

    }else{

        [self.navigationBar setBackgroundImage:backImage forBarMetrics:UIBarMetricsDefault];

    }