iOS指定界面导航栏颜色透明

1、当前界面的viewWillAppear:(BOOL)animated写上以下代码

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    //设置导航栏透明
    [self.navigationController.navigationBar setTranslucent:true];
    //把背景设为空
    [self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
    //处理导航栏有条线的问题
    [self.navigationController.navigationBar setShadowImage:[UIImage new]];
    
}

2、当前界面即将消失时，还原导航栏，避免看不到主题颜色

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
     [self.navigationController.navigationBar setTranslucent:false];
    self.navigationController.navigationBar.barTintColor = YHStringColor(@"#6E98C2");
    
}

到此，结束！