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一,效果图。

二,工程图。

三,代码

RootViewController.h

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#import <UIKit/UIKit.h>@interface RootViewController : UIViewController{  UIButton * leftButton;  UIButton * rightButton;  UIViewController * firstController;  UIViewController * secondController;}@end
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RootViewController.m

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#import "RootViewController.h"@interface RootViewController ()@end@implementation RootViewController- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{  self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];  if (self) {    // Custom initialization  }  return self;}- (void)viewDidLoad{  [super viewDidLoad];  // Do any additional setup after loading the view.    //初始化顶部按钮  [self creatHeadView];    //初始化背景图  [self initBackView];  }#pragma -mark -functions//初始化背景图-(void)initBackView{  firstController = [[UIViewController alloc] init];  firstController.view.backgroundColor = [UIColor redColor];  [self.view addSubview:firstController.view];    secondController = [[UIViewController alloc] init];  secondController.view.backgroundColor = [UIColor blueColor];  }//初始化顶部按钮-(void)creatHeadView{  UIView * headView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 30)];    //左边的按钮  leftButton = [UIButton buttonWithType:UIButtonTypeCustom];  leftButton.frame = CGRectMake(0, 0, 50, 30);  leftButton.tag = 201;  leftButton.enabled = NO;  [leftButton setImage:[UIImage imageNamed:@"left"] forState:UIControlStateNormal];  [leftButton addTarget:self action:@selector(doClickHeadActions:) forControlEvents:UIControlEventTouchUpInside];  [headView addSubview:leftButton];    //右边的按钮  rightButton = [UIButton buttonWithType:UIButtonTypeCustom];  rightButton.frame = CGRectMake(50, 0, 50, 30);  rightButton.tag = 301;  [rightButton setImage:[UIImage imageNamed:@"right"] forState:UIControlStateNormal];  [rightButton addTarget:self action:@selector(doClickHeadActions:) forControlEvents:UIControlEventTouchUpInside];  [headView addSubview:rightButton];    self.navigationItem.titleView = headView;}#pragma -mark -doClickActions-(void)doClickHeadActions:(UIButton *)btn{  if (btn.tag == 201)  {    [secondController dismissViewControllerAnimated:NO completion:nil];    [self.view addSubview:firstController.view];        [btn setImage:[UIImage imageNamed:@"leftselect"] forState:UIControlStateNormal];     btn.enabled = NO;    [rightButton setImage:[UIImage imageNamed:@"right"] forState:UIControlStateNormal];    rightButton.enabled = YES;  }  else if (btn.tag == 301)  {    [firstController dismissViewControllerAnimated:NO completion:nil];    [self.view addSubview:secondController.view];        [btn setImage:[UIImage imageNamed:@"rightselect"] forState:UIControlStateNormal];    btn.enabled = NO;    [leftButton setImage:[UIImage imageNamed:@"left"] forState:UIControlStateNormal];    leftButton.enabled = YES;  }}- (void)didReceiveMemoryWarning{  [super didReceiveMemoryWarning];  // Dispose of any resources that can be recreated.}
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