在自定義設(shè)置導(dǎo)航背景色時(shí)，使用下面的方法，在iOS15+系統(tǒng)上不起作用：

UINavigationBar *appearance = [UINavigationBar appearance];
//        [appearance confi];
        [appearance setBarTintColor:[UIColor whiteColor]];
        [appearance setTintColor: [UIColor whiteColor]];
        appearance.translucent = NO;
        NSMutableDictionary *textAttribute = [NSMutableDictionary dictionary];
        textAttribute[NSForegroundColorAttributeName] = MPColorBlue;//標(biāo)題顏色
        textAttribute[NSFontAttributeName] = [UIFont boldSystemFontOfSize:18];//標(biāo)題大小
        [appearance setTitleTextAttributes:textAttribute];
        
        UIColor *color = MPMainColor;
        UIImage *backGroundImage = [UIImage imageWithColor:color];
        backGroundImage = [backGroundImage resizableImageWithCapInsets:UIEdgeInsetsZero resizingMode:UIImageResizingModeStretch];
        [appearance setBackgroundImage:backGroundImage forBarMetrics:UIBarMetricsDefault];
//        appearance.backgroundColor = color;
    
        //去除底部黑線
        [appearance setShadowImage:[UIImage new]];

但是，如你的頁(yè)面有scrollView，例如table、webView這些，滑動(dòng)的時(shí)候，導(dǎo)航顏色會(huì)變?yōu)槟阍O(shè)置的顏色，但是一旦滑動(dòng)到頂部，導(dǎo)航又會(huì)不正常，變成黑色；

查了資料，說(shuō)在iOS15+使用下面的方法：

UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
    
    [appearance configureWithOpaqueBackground];
    NSMutableDictionary *textAttribute = [NSMutableDictionary dictionary];
    textAttribute[NSForegroundColorAttributeName] = MPColorBlue;//標(biāo)題顏色
    textAttribute[NSFontAttributeName] = [UIFont boldSystemFontOfSize:18];//標(biāo)題大小
    [appearance setTitleTextAttributes:textAttribute];
    
    //去除底部黑線
    [appearance setShadowImage:[UIImage new]];
    
    UIColor *color = MPMainColor;
     appearance.backgroundColor = color;
    
    self.navigationBar.standardAppearance = appearance;

該方法表現(xiàn)和上面一致；

最終在一個(gè)文章里看到這個(gè)屬性：

self.navigationBar.scrollEdgeAppearance

需要把這個(gè)也設(shè)置了才會(huì)表現(xiàn)正常，最終完整的設(shè)置如下：

UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
    
    [appearance configureWithOpaqueBackground];
    NSMutableDictionary *textAttribute = [NSMutableDictionary dictionary];
    textAttribute[NSForegroundColorAttributeName] = MPColorBlue;//標(biāo)題顏色
    textAttribute[NSFontAttributeName] = [UIFont boldSystemFontOfSize:18];//標(biāo)題大小
    [appearance setTitleTextAttributes:textAttribute];
    
    //去除底部黑線
    [appearance setShadowImage:[UIImage new]];
    
    UIColor *color = MPMainColor;
    appearance.backgroundColor = color;
    
    self.navigationBar.standardAppearance = appearance;
    self.navigationBar.scrollEdgeAppearance = appearance;

我這里設(shè)置的 backgroundColor，你也可以設(shè)置BackgroundImage