关于navigationBar的一些设定

去掉navigationBar下面的横线

[self.navigationBar setShadowImage:[UIImage new]];

为navigaBar添加下阴影

//阴影颜色
self.navigationBar.layer.shadowColor = [UIColor blackColor].CGColor;
//阴影偏移
self.navigationBar.layer.shadowOffset = CGSizeMake(0, 5);
//阴影透明度
self.navigationBar.layer.shadowOpacity = 0.1;

更改navigationbar背景颜色

self.navigationController.navigationBar.backgroundColor = [UIColor orangeColor];
//下面的代码是为了将毛玻璃效果去掉
[self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];

更改statusbar背景颜色

/**
UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];
if ([statusBar respondsToSelector:@selector(setBackgroundColor:)]) {
    statusBar.backgroundColor = [UIColor orangeColor];
}
**/


if (@available(iOS 13.0, *)) {
       UIView *statusBar = [[UIView alloc]initWithFrame:[UIApplication sharedApplication].keyWindow.windowScene.statusBarManager.statusBarFrame] ;
        statusBar.backgroundColor = color;
        [[UIApplication sharedApplication].keyWindow addSubview:statusBar];
    } else {
        // Fallback on earlier versions
        UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];
           if ([statusBar respondsToSelector:@selector(setBackgroundColor:)]) {
               statusBar.backgroundColor = color;
           }
    }

更改navgationbar上Title颜色

NSDictionary * dict=[NSDictionary dictionaryWithObject:[UIColor greenColor] forKey:NSForegroundColorAttributeName];
self.navigationController.navigationBar.titleTextAttributes = dict;

将navgationbar上返回箭头改为'返回'文字

UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] init];
backButtonItem.title = @"返回";
self.navigationItem.backBarButtonItem = backButtonItem;

添加navigationbar右侧item按钮

UIBarButtonItem *myButton = [[UIBarButtonItem alloc] initWithTitle:@"退出登录" style:UIBarButtonItemStyleBordered target:self action:@selector(logout)];
myButton.tintColor = [UIColor redColor];
self.navigationItem.rightBarButtonItem = myButton;

添加navigationbar右侧item按钮(多个)

UIBarButtonItem *pulishButton = [[UIBarButtonItem alloc]initWithTitle:@"发布" style:UITabBarSystemItemContacts target:self action:@selector(pulish:)];  
[pulishButton setTintColor:kMainColor];  
UIBarButtonItem *saveButton = [[UIBarButtonItem alloc]initWithTitle:@"保存" style:UITabBarSystemItemContacts target:self action:@selector(save:)];  
[self.navigationItem setRightBarButtonItems:[NSArray arrayWithObjects: pulishButton,saveButton,nil]];