上篇说到了添加UIBarButtonItem，接下来说说界面切换；
1、首先我们在刚才的RootViewController中添加一个按钮用来实现跳转：
打开RootViewController.m(我就继续写了)，添加一个跳转button：
效果图：
2、button动作实现，新建一个NewViewController继承自UIViewController；用pushViewController到navigationController中去；
#import "NewViewController.h"
- (void)nextAction{
NewViewController *NewVC = [[NewViewController alloc] init];
[self.navigationController pushViewController:NewVC animated:YES];
NewVC.title = @"NewViewController";
}点击button,如图Back为系统自带按钮；
如果不想使用系统自带按钮，我们可以自定义按钮：
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"返回"style:UIBarButtonItemStyleDone target:nil action:nil];
self.navigationItem.backBarButtonItem = backButton;
如图：
3、title的自定义：
#import "NewViewController.h"
@interface NewViewController ()
@end
@implementation NewViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
UILabel *title = [[UILabel alloc] init];
title.text = @"标题";
title.font = [UIFont systemFontOfSize:];
[title sizeToFit];
self.navigationItem.titleView = title;
}效果图：
4、如果想放置多个按钮：
SegmentedControl又被称作分段控制器，可以一下放置多个按钮又不影响美观：
NSArray *colorArray = @[@"黑", @"白", @"灰"];
UISegmentedControl *segmentCtrl = [[UISegmentedControl alloc] initWithItems:colorArray];
segmentCtrl.selectedSegmentIndex = ;
segmentCtrl.tintColor = [UIColor redColor];
self.navigationItem.titleView = segmentCtrl;
效果图：
添加点击响应事件：
[segmentCtrl addTarget:self action:@selector(segmentAction:) forControlEvents:UIControlEventValueChanged];
- (void)segmentAction:(id)segment{
switch ([segment selectedSegmentIndex]) {
case :
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"您选择了颜色黑" delegate:self cancelButtonTitle:@"是" otherButtonTitles:@"否", nil];
[alert show];
}
break;
case :
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"您选择了颜色白" delegate:self cancelButtonTitle:@"是" otherButtonTitles:@"否", nil];
[alert show];
}
break;
case :
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"您选择了颜色灰" delegate:self cancelButtonTitle:@"是" otherButtonTitles:@"否", nil];
[alert show];
}
break;
default:
break;
}
}效果图：