UIKit框架中有各种Bar,UITabBar、UINavigationBar、UIToolbar。Bar对应的就有一些Item,tabBarItem、navigationItem、toolbarItems,再加上UIViewController、UINavigationController、UITabBarController很容易搞糊涂。我看了好久,没看明白。动手敲了下才有一点感觉。
一、联系
一个UINavigationController对应着一个UINavigationBar、UIToolbar,UIToolbar默认不显示,toolbarHidden=NO时显示。一个UITabBarController对应着一个UITabBar.一个UIViewController对应着一个tabBarItem、navigationItem和多个toolbarItems。navigationItem中可以设置左右按钮和中间视图等。
二、代码demo
1.首先代码结构 viewController1－viewController5用于生成5个tabBarItem。viewController、viewController6主要模拟登录注册，有时候需要先让用户登录注册之后才能进入。
2.代码
1.在AppDelegate.m中
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
tabBarViewController *tabVc=[[tabBarViewController alloc]init];
[self.window makeKeyAndVisible];
self.window.backgroundColor=[UIColor whiteColor];
self.window.rootViewController=tabVc;
return YES;
}2.ViewController.m
//
// ViewController.m
// UITabBarController
//
// Created by City--Online on 15/5/26.
// Copyright (c) 2015年 XQB. All rights reserved.
//
#import "ViewController.h"
#import "ViewController6.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
NSLog(@"%@ %@",NSStringFromCGRect(self.tabBarController.tabBar.frame),NSStringFromCGRect(self.navigationController.toolbar.frame));
UIButton *btn=[UIButton buttonWithType:UIButtonTypeSystem];
btn.frame=CGRectMake(100, 100, 100, 100);
[btn setTitle:@"按钮" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
UIBarButtonItem *item1=[[UIBarButtonItem alloc]initWithBarButtonSystemItem: UIBarButtonSystemItemDone target:self action:nil];
self.toolbarItems=@[item1];
}
-(void)btnClick:(id)sender
{
ViewController6 *vc6=[[ViewController6 alloc]init];
vc6.title=@"第6页";
vc6.hidesBottomBarWhenPushed=YES;
[self.navigationController pushViewController:vc6 animated:YES];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end3.ViewController1.m
//
// ViewController1.m
// UITabBarController
//
// Created by City--Online on 15/5/26.
// Copyright (c) 2015年 XQB. All rights reserved.
//
#import "ViewController1.h"
#import "ViewController2.h"
@interface ViewController1 ()
@end
@implementation ViewController1
- (void)viewDidLoad {
[super viewDidLoad];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end4.ViewController2.m
//
// ViewController2.m
// UITabBarController
//
// Created by City--Online on 15/5/26.
// Copyright (c) 2015年 XQB. All rights reserved.
//
#import "ViewController2.h"
#import "ViewController.h"
#import "navigationViewController.h"
@interface ViewController2 ()
@end
@implementation ViewController2
- (void)viewDidLoad {
[super viewDidLoad];
ViewController *vc=[[ViewController alloc]init];
// navigationViewController *nav=[[navigationViewController alloc]initWithRootViewController:vc];
// self.navigationController.toolbarHidden=NO;
// nav.toolbarHidden=NO;
[self.navigationController addChildViewController:vc];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end5.ViewController6.m
//
// ViewController6.m
// UITabBarController
//
// Created by City--Online on 15/5/26.
// Copyright (c) 2015年 XQB. All rights reserved.
//
#import "ViewController6.h"
@interface ViewController6 ()
@end
@implementation ViewController6
- (void)viewDidLoad {
[super viewDidLoad];
NSLog(@"%@ %@",NSStringFromCGRect(self.tabBarController.tabBar.frame),NSStringFromCGRect(self.navigationController.toolbar.frame));
UIBarButtonItem *item1=[[UIBarButtonItem alloc]initWithBarButtonSystemItem: UIBarButtonSystemItemAdd target:self action:@selector(btnClick:)];
self.toolbarItems=@[item1];
}
-(void)btnClick:(id)sender
{
[self.navigationController popToRootViewControllerAnimated:YES];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end6.tabBarViewController.m继承UITabBarController
//
// tabBarViewController.m
// UITabBarController
//
// Created by City--Online on 15/5/26.
// Copyright (c) 2015年 XQB. All rights reserved.
//
#import "tabBarViewController.h"
#import "ViewController.h"
#import "ViewController1.h"
#import "ViewController2.h"
#import "ViewController3.h"
#import "ViewController4.h"
#import "ViewController5.h"
#import "navigationViewController.h"
@interface tabBarViewController ()<UITabBarControllerDelegate>
@end
@implementation tabBarViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self steup];
self.delegate=self;
self.selectedIndex=2;
self.moreNavigationController.tabBarItem=[[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemRecents tag:1001];
self.moreNavigationController.navigationItem.rightBarButtonItem=[[UIBarButtonItem alloc]initWithTitle:@"编辑" style:UIBarButtonItemStyleDone target:self action:nil];
self.moreNavigationController.visibleViewController.navigationItem.title=@"更多功能";
self.moreNavigationController.visibleViewController.navigationItem.rightBarButtonItem.title=@"编辑";
}
-(void)rightClick:(id)sender
{
}
-(void)steup
{
ViewController *vc=[[ViewController alloc]init];
vc.title=@"第0页";
navigationViewController *nvc=[[navigationViewController alloc]initWithRootViewController:vc];
nvc.toolbarHidden=NO;
UITabBarItem *tabBarItem=[[UITabBarItem alloc]initWithTitle:@"第0页" image:[UIImage imageNamed:@"tabbar_homepage_normal"] selectedImage:[UIImage imageNamed:@"tabbar_homepage_selected"]];
tabBarItem.badgeValue=@"2";
nvc.tabBarItem=tabBarItem;
ViewController1 *vc1=[[ViewController1 alloc]init];
vc1.title=@"第1页";
navigationViewController *nvc1=[[navigationViewController alloc]initWithRootViewController:vc1];
nvc1.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"第1页" image:[UIImage imageNamed:@"tabbar_convenience_normal"] selectedImage:[UIImage imageNamed:@"tabbar_convenience_selected"]];
ViewController2 *vc2=[[ViewController2 alloc]init];
vc2.title=@"第2页";
navigationViewController *nvc2=[[navigationViewController alloc]initWithRootViewController:vc2];
nvc2.toolbarHidden=NO;
nvc2.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"第2页" image:[UIImage imageNamed:@"tabbar_electrice_commerce_normal"] selectedImage:[UIImage imageNamed:@"tabbar_electrice_commerce_selected"]];
ViewController3 *vc3=[[ViewController3 alloc]init];
vc3.title=@"第3页";
navigationViewController *nvc3=[[navigationViewController alloc]initWithRootViewController:vc3];
vc3.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"第3页" image:[UIImage imageNamed:@"tabbar_me_normal"] selectedImage:[UIImage imageNamed:@"tabbar_me_selected"]];
ViewController4 *vc4=[[ViewController4 alloc]init];
vc4.title=@"第4页";
navigationViewController *nvc4=[[navigationViewController alloc]initWithRootViewController:vc4];
nvc4.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"第4页" image:[UIImage imageNamed:@"tabbar_convenience_normal"] selectedImage:[UIImage imageNamed:@"tabbar_convenience_selected"]];
ViewController5 *vc5=[[ViewController5 alloc]init];
vc5.title=@"第5页";
navigationViewController *nvc5=[[navigationViewController alloc]initWithRootViewController:vc5];
nvc5.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"第5页" image:[UIImage imageNamed:@"tabbar_homepage_normal"] selectedImage:[UIImage imageNamed:@"tabbar_homepage_selected"]];
// 默认的顺序
NSArray *defaultarr=@[nvc,nvc1,nvc2,nvc3,nvc4,nvc5];
// 自定义的顺序
NSMutableArray *newarr=[[NSMutableArray alloc]init];
//获取保存的title数组
NSArray *titles=[[NSUserDefaults standardUserDefaults] arrayForKey:@"vcs"];
// 第一次启动为nil
if (titles==nil) {
newarr=[defaultarr copy];
}
//根据自定义title数组 设置newarr数组
for (NSString *s in titles) {
for (navigationViewController *nvc in defaultarr) {
if ([s isEqualToString:nvc.visibleViewController.title]) {
[newarr addObject:nvc];
}
}
}
self.viewControllers=newarr;
}
//UITabBarControllerDelegate
//是否可以选中
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController
{
return YES;
}
//选中某个viewController
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
// NSLog(@"%@",viewController.title);
}
//开始自定义viewControllers
- (void)tabBarController:(UITabBarController *)tabBarController willBeginCustomizingViewControllers:(NSArray *)viewControllers
{
NSLog(@"%@",viewControllers);
}
//即将编辑结束
- (void)tabBarController:(UITabBarController *)tabBarController willEndCustomizingViewControllers:(NSArray *)viewControllers changed:(BOOL)changed
{
NSLog(@"%d",changed);
}
//编辑结束
- (void)tabBarController:(UITabBarController *)tabBarController didEndCustomizingViewControllers:(NSArray *)viewControllers changed:(BOOL)changed
{
//记下选择的选项顺序，方便下次启动时显示
NSMutableArray *arr=[[NSMutableArray alloc]init];
if (!changed) {
return;
}
for (UIViewController *vc in viewControllers) {
[arr addObject:vc.title];
}
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
[defaults setObject:arr forKey:@"vcs"];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end7.navigationViewController.m
//
// navigationViewController.m
// UITabBarController
//
// Created by City--Online on 15/5/26.
// Copyright (c) 2015年 XQB. All rights reserved.
//
#import "navigationViewController.h"
@interface navigationViewController ()<UINavigationControllerDelegate>
@end
@implementation navigationViewController
- (void)viewDidLoad {
[super viewDidLoad];
// if ([self respondsToSelector:@selector(setEdgesForExtendedLayout:)])
// {
// self.edgesForExtendedLayout = UIRectEdgeNone;
// }
self.navigationController.navigationBar.translucent=NO;
self.delegate=self;
}
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
NSLog(@"%@",viewController.title);
}
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end实现效果: