自定义导航栏样式（背景、标题、图片、返回按钮、功能按钮）

一、更改导航栏的背景

[self.navigationController.navigationBar setBarTintColor:[UIColor colorWithRed:20/255.0 green:155/255.0 blue:213/255.0 alpha:1.0]];  

// 需要额外设置 info.plist 中的 View controller-based status bar appearance 这个设置方法可以在AppDelegate中设置，全局可以生效
[[UINavigationBar appearance] setBarTintColor:[UIColor redColor]];

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二、改变导航栏标题属性

方法1

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

方法2

[[UINavigationBar appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor]}];

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三、在导航栏使用背景图片

[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"logo.png"] forBarMetrics:UIBarMetricsDefault]; 

[[UINavigationBar appearance] setBackgroundImage:[[UIImage imageNamed:@"coupon"] stretchableImageWithLeftCapWidth:2 topCapHeight:2] forBarMetrics:UIBarMetricsDefault];

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四、使用图片作为导航栏标题

self.navigationItem.titleView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"coupon"]];

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五、添加多个栏按钮项目

UIBarButtonItem *shareItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:nil];
UIBarButtonItem *cameraItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:nil];
NSArray *itemsArr = @[shareItem,cameraItem];
self.navigationItem.rightBarButtonItems = itemsArr;

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六、自定义后退按钮的文字和颜色

方法1 注意，要在父视图的Controller中设置

ViewController *vc = [ViewController new];
[self.navigationController pushViewController:vc animated:YES];
UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain target:nil action:nil];
self.navigationItem.backBarButtonItem = item;

方法2

[[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];

七、自定义返回按钮

UIImage *backButtonImage = [[UIImage imageNamed:@"fanhui.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 30, 0, 0)];  
[[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];  
//将返回按钮的文字position设置不在屏幕上显示  
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(NSIntegerMin, NSIntegerMin) forBarMetrics:UIBarMetricsDefault];