UINavigation的一些常用用法（持续更新-2016年10月27日）

先看示例程序：

完整代码如下：

AppDelegate.m

#import "AppDelegate.h"
#import "ViewController.h"
#import "SecondViewController.h"
@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
self.window.backgroundColor = [UIColor whiteColor];

ViewController * vc = [[ViewController alloc]init];
UINavigationController * nav = [[UINavigationController alloc]initWithRootViewController:vc];
UITabBarController * tabBar = [[UITabBarController alloc]init];
tabBar.viewControllers = @[nav];
self.window.rootViewController = tabBar;
//更改导航栏背景颜色（所有的导航栏都颜色变了，当然，这句话写在viewController的viewdidload中也可以）
vc.navigationController.navigationBar.barTintColor = [UIColor yellowColor];

return YES;
}

ViewController.m

#import "ViewController.h"
#import "SecondViewController.h"
@interface ViewController ()
@end

@implementation ViewController

-(id)init
{
if (self = [super init]) {
self.title = @"首页";
}
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

UIButton * btn = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 200,40)];
btn.center = self.view.center;
btn.layer.cornerRadius = 10;
btn.layer.masksToBounds = YES;
btn.backgroundColor = [UIColor orangeColor];
[btn setTitle:@"跳转到第二个页面" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(clickJump) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];

//    更改navigation字体颜色,(所有的都变成红色了,第一个是过时的写法，第二个是新写法)
//    [self.navigationController.navigationBar  setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor redColor] ,UITextAttributeTextColor, nil]];
[self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor redColor]}];

//    系统自带的rightbarbuttonitem(带图片)[1]
UIBarButtonItem* right = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"finish"] style:UIBarButtonItemStylePlain target:self action:@selector(right)];

//rightBarButtonItem也可以换成leftBarButtonItem
self.navigationItem.rightBarButtonItem = right;

//    更改返回按钮颜色
self.navigationController.navigationBar.tintColor = [UIColor purpleColor];

//    更改返回按钮标题
UIBarButtonItem * backItem = [[UIBarButtonItem  alloc]init];
backItem.title = @"返回";
self.navigationItem.backBarButtonItem = backItem;

//    更改导航栏背景颜色（写在APPdelegate.m中也可以，但是下面两种写法的效果区别）[2]
//   self.navigationController.navigationBar.backgroundColor = [UIColor yellowColor];
//    self.navigationController.navigationBar.barTintColor = [UIColor yellowColor];

}

-(void)right
{
NSLog(@"点击了右上角按钮");
}
-(void)clickJump
{
[self.navigationController pushViewController:[[SecondViewController alloc]init] animated:YES];
}

@end

[1]注意：此处可以换成系统自带的，如：

UIBarButtonItem * right = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(right)];

效果图：



也可以直接设置成文字的形式，如：

UIBarButtonItem * finish = [[UIBarButtonItem alloc]initWithTitle:@"完成" style:UIBarButtonItemStylePlain target:self action:@selector(finish)];

效果图：



[2]注意：AppDelegate.m中没有XX.navigationController.navigationBar.backgroundColor = [UIColor yellowColor];这种写法，若把更改导航栏的颜色代码写在viewdidload中，则二者的直观区别和图层区别分别为：

self.navigationController.navigationBar.backgroundColor = [UIColor yellowColor];

self.navigationController.navigationBar.barTintColor = [UIColor yellowColor];

显而易见，二者的颜色为何不一样，就是因为两种方法中，颜色层的位置不一致。

SecondViewController.m

#import "SecondViewController.h"
#import "ThirdViewController.h"
@interface SecondViewController ()

@end

@implementation SecondViewController

//页面跳转过后，底部的bottombar消失，返回上级页面，它会再次出现[3]
-(BOOL)hidesBottomBarWhenPushed
{
return YES;
}
-(id)init
{
if (self = [super init]) {
self.title = @"第二个页面";
//        self.navigationItem.title = @"第二个页面";
}
return self;
}

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor whiteColor];

//    [self.navigationController.navigationBar  setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor greenColor] ,UITextAttributeTextColor, nil]];

//    更改右上角按钮
UIBarButtonItem * finish = [[UIBarButtonItem alloc]initWithTitle:@"完成" style:UIBarButtonItemStylePlain target:self action:@selector(finish)];
self.navigationItem.rightBarButtonItem = finish;

UIButton * btn = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 200,40)];
btn.center = self.view.center;
btn.layer.cornerRadius = 10;
btn.layer.masksToBounds = YES;
btn.backgroundColor = [UIColor orangeColor];
[btn setTitle:@"返回到第一个页面" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(clickJump) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];

}

-(void)clickJump
{
NSLog(@"返回到第一页面");
[self.navigationController popViewControllerAnimated:YES];
}
-(void)finish{
NSLog(@"点击了完成按钮");
}

@end

[3]注意：若把

-(BOOL)hidesBottomBarWhenPushed

{

return YES;

}

改成：

self.navigationController.hidesBottomBarWhenPushed = YES;

则，底部bottombar无论如何也不会消失

若改成：

self.tabBarController.tabBar.hidden = YES;

则，底部bottombar将在页面跳转后永远消失，即使返回上级页面也不会出现

多级页面跳转到指定页面的方法

for (UIViewController *controller in self.navigationController.viewControllers) {
if ([controller isKindOfClass:[SecondViewController class]]) {
[self.navigationController popToViewController:controller animated:YES];
}
}