//1.設置導航欄背景顏色
[[UINavigationBar appearance] setBarTintColor:[UIColor orangeColor]];
 
//2.設置導航欄背景圖片
[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"navigationBarImg"] forBarMetrics:UIBarMetricsDefault];
 
//3.設置導航欄標題樣式
[[UINavigationBar appearance] setTitleTextAttributes: [NSDictionary dictionaryWithObjectsAndKeys:
 [UIColor purpleColor], NSForegroundColorAttributeName,
 [UIFont boldSystemFontOfSize:25], NSFontAttributeName, nil]];
 
//4.設置導航欄返回按鈕的顏色
[[UINavigationBar appearance] setTintColor:[UIColor greenColor]];

//5.設置導航欄隱藏
[[UINavigationBar appearance] setHidden:YES];

//進入頁面時設置顏色：灰色
- (void)viewWillAppear:(BOOL)animated{
 [super viewWillAppear:animated];
 [self.navigationController.navigationBar setBarTintColor:[UIColor grayColor]];
}

//離開頁面時還原為全局設置：橙色
- (void)viewWillDisappear:(BOOL)animated{
 [super viewWillDisappear:animated];
 [self.navigationController.navigationBar setBarTintColor:[UIColor orangeColor]];
}

#import “BaseNavigationController.h"
//第一步：設置自定義導航控制器使用UIGestureRecognizerDelegate
@interface BaseNavigationController ()<UIGestureRecognizerDelegate>
@end

@implementation BaseNavigationController
- (void)viewDidLoad {
 [super viewDidLoad];
 //第二步：設置自定義導航控制器的側滑手勢的代理
 self.interactivePopGestureRecognizer.delegate = self;
}
 

//第三步：實現(xiàn)代理方法
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
 if (self.childViewControllers.count == 1) {
 // 表示用戶在根控制器界面，就不需要觸發(fā)滑動手勢，
 return NO;
 }
 return YES;
}
@end

#import "TestViewController.h"
@interface TestViewController ()
//第一步：設置一個屬性，存放導航欄底部分割線對象
@property (nonatomic, strong) UIImageView *navBarBottomImage;
@end

@implementation TestViewController
- (void)viewDidLoad {
 [super viewDidLoad];
 ////第三步：獲取導航欄底部分割線對象
 UIImageView *navBarBottomImage = [self findNavBarBottomImage:self.navigationController.navigationBar];
 self.navBarBottomImage = navBarBottomImage;
 }

//第四步：設置分割線的顯示或隱藏
//進入頁面隱藏分割線
- (void)viewWillAppear:(BOOL)animated{
 [super viewWillAppear:animated];
 self.navBarBottomImage.hidden = YES;
}
//離開頁面時顯示分割線
-(void)viewWillDisappear:(BOOL)animated{
 [super viewWillDisappear:animated];
 self.navBarBottomImage.hidden = NO;
}

//第二步：添加用于獲取導航欄分割線的方法
//導航欄底部分割線是一個UIImageView,且高度不超過1.0個高度，可據(jù)此查找此對象
-(UIImageView *)findNavBarBottomImage:(UIView *)view {
 if ([view isKindOfClass:UIImageView.class] && view.bounds.size.height <= 1.0) {
 return (UIImageView *)view;
 }
 for (UIView *subview in view.subviews) {
 UIImageView *imageView = [self findNavBarBottomImage:subview];
 if (imageView) {
 return imageView;
 }
 }
 return nil;
}

//UITextView是滑動視圖，內(nèi)容自動向下偏移，不會被導航欄覆蓋
UITextView *leftTextView = [[UITextView alloc] init];
leftTextView.frame = CGRectMake(0, 0,100, kDeviceHeight); //
leftTextView.backgroundColor = [UIColor lightGrayColor];
leftTextView.text = @"君不見，黃河之水天上來，奔流到海不復回。君不見，高堂明鏡悲白發(fā)，朝如青絲暮成雪。人生得意須盡歡，莫使金樽空對月。天生我材必有用，千金散盡還復來。";
leftTextView.font = [UIFont systemFontOfSize:18];
leftTextView.editable = NO;
[self.view addSubview:leftTextView];
 
//UIView是非滑動視圖，內(nèi)容被導航欄部分覆蓋
UIView *rightView= [[UIView alloc] initWithFrame:CGRectMake(150, 0, 100, 100)];
rightView.backgroundColor = [UIColor redColor];
[self.view addSubview:rightView];

//automaticallyAdjustsScrollViewInsets在11.0后失效，所以需要判斷
if (@available(iOS 11.0,*)) {
 scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
}else{
 //automaticallyAdjustsScrollViewIn，關閉自動偏移的系統(tǒng)優(yōu)化
 self.automaticallyAdjustsScrollViewInsets = NO;
}

self.navigationController.navigationBar.translucent= NO;