自定义UITabbarcontrollerview

// 初始化contentView
[self initContentView];

#pragma mark 初始化contentView
- (void)initContentView {
    CGSize size = self.view.bounds.size;
    UIView *contentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, size.width, size.height - kTabbarHeight)];
    contentView.backgroundColor = [UIColor colorWithRed:0.8 green:0.8 blue:0.8 alpha:1];
    [self.view addSubview:contentView];
    [contentView release];
    _contentView = contentView;
}

// 设置主题
[self initTheme];

#pragma mark 设置主题
- (void)initTheme {
    // 设置导航栏背景
    UIImage *navBg = [UIImage resizeImage:@"navigationbar_background.png"];
    [[UINavigationBar appearance] setBackgroundImage:navBg forBarMetrics:UIBarMetricsDefault];
    
    // 设置导航栏文字属性
    NSMutableDictionary *attrs = [NSMutableDictionary dictionary];
    // 设置文字颜色
    [attrs setObject:[UIColor blackColor] forKey:UITextAttributeTextColor];
    [[UINavigationBar appearance] setTitleTextAttributes:attrs];
}

// 初始化所有的子控制器
[self initControllers];

#pragma mark 初始化子控制器
- (void)initControllers {
    _items = [NSMutableArray array];
    
    HomeController *home = [[HomeController alloc] init];
    [self addController:home title:@"首页" normal:@"tabbar_home.png" highlighted:@"tabbar_home_highlighted.png"];
    [home release];
    
    MyDataController *data = [[MyDataController alloc] init];
    [self addController:data title:@"我的资料" normal:@"tabbar_message_center.png" highlighted:@"tabbar_message_center_highlighted.png"];
    [data release];
    
    FriendController *friend = [[FriendController alloc] init];
    [self addController:friend title:@"我的关注" normal:@"tabbar_profile.png" highlighted:@"tabbar_profile_highlighted.png"];
    [friend release];
    
    FollowerController *follower = [[FollowerController alloc] init];
    [self addController:follower title:@"我的粉丝" normal:@"tabbar_discover.png" highlighted:@"tabbar_discover_highlighted.png"];
    [follower release];
    
    UIViewController *more = [[UIViewController alloc] init];
    more.view.backgroundColor = [UIColor redColor];
    [self addController:more title:@"更多" normal:@"tabbar_more.png" highlighted:@"tabbar_more_highlighted.png"];
    [more release];
}

=========================================
#pragma mark 添加子控制器和item
- (void)addController:(UIViewController *)vc title:(NSString *)title normal:(NSString *)normal highlighted:(NSString *)highlighted {
    // 初始化item
    MJTabbarItemDesc *item = [MJTabbarItemDesc itemWithTitle:title normal:normal highlighted:highlighted];
    [_items addObject:item];
    
    // 设置控制器的标题
    vc.title = title;
    
    // 包装控制器
    UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:vc];
    
    nav1.delegate = self;
    
    // 对子控制器做了一次retain
    [self addChildViewController:nav1];
    [nav1 release];
}

// 初始化tabbar
[self initTabbar];

#pragma mark - 私有方法
#pragma mark 初始化tabbar
- (void)initTabbar {
    CGSize size = self.view.bounds.size;
    CGRect frame = CGRectMake(0, size.height - kTabbarHeight, size.width, kTabbarHeight);
    MJTabbar *tab = [[MJTabbar alloc] initWithFrame:frame items:_items];
    // 设置代理
    tab.delegate = self;
    [self.view addSubview:tab];
    [tab release];
    
    _tabbar = tab;
}

============================================

//  自定义Tabbar

#import <UIKit/UIKit.h>

@protocol MJTabbarDelegate <NSObject>
- (void)tabbarItemChangeFrom:(int)from to:(int)to;
@end

@interface MJTabbar : UIView
// items ： 有多少个标签
- (id)initWithFrame:(CGRect)frame items:(NSArray *)items;

@property (nonatomic, assign) id<MJTabbarDelegate> delegate;
@end


#import "MJTabbar.h"
#import "MJTabbarItem.h"

@interface MJTabbar() {
    // 当前被选中的tabbaritem
    MJTabbarItem *_current;
}
@end

@implementation MJTabbar

#pragma mark item点击
- (void)itemClick:(MJTabbarItem *)new {
    // 设置selected为YES，就能达到UIControlStateSelected状态
    if (_current != new) {
        if ([self.delegate respondsToSelector:@selector(tabbarItemChangeFrom:to:)]) {
            [self.delegate tabbarItemChangeFrom:_current.tag to:new.tag];
        }
        
        _current.userInteractionEnabled = YES;
        new.userInteractionEnabled = NO;
        
        new.selected = YES;
        _current.selected = NO;
        
        _current = new;
    }
}

#pragma mark 构造方法
- (id)initWithFrame:(CGRect)frame items:(NSArray *)items {
    if (self = [super initWithFrame:frame]) {
        // colorWithPatternImage ： 平铺一张图片来生成背景颜色
        self.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"tabbar_background.png"]];
        
        int count = items.count;
        CGFloat itemHeight = self.bounds.size.height;
        CGFloat itemWidth = self.bounds.size.width / count;
                
        for (int index = 0; index < count; index++) {
            MJTabbarItemDesc *desc = [items objectAtIndex:index];
            CGFloat itemX = index * itemWidth;
            CGRect itemFrame = CGRectMake(itemX, 0, itemWidth, itemHeight);
            MJTabbarItem *item = [[MJTabbarItem alloc] initWithFrame:itemFrame itemDesc:desc];
            
            // 设置一个标记
            item.tag = index;
            
            [item addTarget:self action:@selector(itemClick:) forControlEvents:UIControlEventTouchUpInside];
            
            [self addSubview:item];
            [item release];
            
            if (index == 0) {
                // 让第0个item选中
                [self itemClick:item];
            }
        }
        
    }
    return self;
}

@end

自定义导航按钮

#import <UIKit/UIKit.h>
@class MJTabbarItemDesc;

@interface MJTabbarItem : UIButton
- (id)initWithFrame:(CGRect)frame itemDesc:(MJTabbarItemDesc *)desc;
@end

@interface MJTabbarItemDesc : NSObject
@property (nonatomic, copy) NSString *title; // 标题
@property (nonatomic, copy) NSString *normal; //默认图标
@property (nonatomic, copy) NSString *highlighted; // 高亮图标

+ (id)itemWithTitle:(NSString *)title normal:(NSString *)normal highlighted:(NSString *)highlighted;
@end


#import "MJTabbarItem.h"

@implementation MJTabbarItem

- (id)initWithFrame:(CGRect)frame itemDesc:(MJTabbarItemDesc *)desc {
    if (self = [super initWithFrame:frame]) {
        // 设置高亮显示的背景
        [self setHighlightedBg:@"tabbar_slider.png"];
        // 设置selected=YES时的背景
        [self setSelectedBg:@"tabbar_slider.png"];
        
        // 设置默认的Image
        [self setImage:[UIImage imageNamed:desc.normal] forState:UIControlStateNormal];
        // 设置selected=YES时的image
        [self setImage:[UIImage imageNamed:desc.highlighted] forState:UIControlStateSelected];
        
        // 不需要在用户长按的时候调整图片为灰色
        self.adjustsImageWhenHighlighted = NO;
        // 设置UIImageView的图片居中
        self.imageView.contentMode = UIViewContentModeCenter;
        
        // 设置文字
        [self setTitle:desc.title forState:UIControlStateNormal];
        // 设置文字居中
        self.titleLabel.textAlignment = NSTextAlignmentCenter;
        // 设置字体大小
        self.titleLabel.font = [UIFont systemFontOfSize:10];
    }
    return self;
}

#pragma mark - 覆盖父类的2个方法
#pragma mark 设置按钮标题的frame
- (CGRect)titleRectForContentRect:(CGRect)contentRect {
    UIImage *image =  [self imageForState:UIControlStateNormal];
    CGFloat titleY = image.size.height - 3;
    CGFloat titleHeight = self.bounds.size.height - titleY;
    return CGRectMake(0, titleY, self.bounds.size.width,  titleHeight);
}
#pragma mark 设置按钮图片的frame
- (CGRect)imageRectForContentRect:(CGRect)contentRect {
    UIImage *image =  [self imageForState:UIControlStateNormal];
    return CGRectMake(0, 0, self.bounds.size.width, image.size.height);
}

@end

@implementation MJTabbarItemDesc
+ (id)itemWithTitle:(NSString *)title normal:(NSString *)normal highlighted:(NSString *)highlighted {
    MJTabbarItemDesc *desc = [[MJTabbarItemDesc alloc] init];
    desc.title = title;
    desc.normal = normal;
    desc.highlighted = highlighted;
    return [desc autorelease];
}

- (void)dealloc {
    [_title release];
    [_normal release];
    [_highlighted release];
    [super dealloc];
}
@end

tabbar和导航控制用代理的交互

#pragma mark - MJTabbar的代理方法
// 在这里切换子控制器
- (void)tabbarItemChangeFrom:(int)from to:(int)to {
    // 取出旧控制器
    UIViewController *old = [self.childViewControllers objectAtIndex:from];
    // 移除旧控制器的view
    [old.view removeFromSuperview];
    
    // 取出新控制器
    UIViewController *new = [self.childViewControllers objectAtIndex:to];
    new.view.frame = _contentView.bounds;
    // 添加新控制器的view
    [_contentView addSubview:new.view];
    
    // 执行动画
    if (from != to) {
        CATransition *anim = [CATransition animation];
        anim.duration = 0.15;
        anim.type = kCATransitionPush;
        anim.subtype = (to > from)?kCATransitionFromRight:kCATransitionFromLeft;
        [_contentView.layer addAnimation:anim forKey:nil];
    }
}

导航控制器代理方法

#pragma mark 返回
- (void)back {
    [_currentController.navigationController popViewControllerAnimated:YES];
}

#pragma mark home
- (void)home {
    [_currentController.navigationController popToRootViewControllerAnimated:YES];
}

#pragma mark - 导航控制器代理方法
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    UIViewController *root = [navigationController.viewControllers objectAtIndex:0];
    if (viewController == root) {
        // 回到根控制器，显示tabbar
        [UIView animateWithDuration:0.3 animations:^{
            // 显示tabbar
            CGRect frame = _tabbar.frame;
            frame.origin.y = self.view.bounds.size.height - _tabbar.bounds.size.height;
            _tabbar.frame = frame;
            
            // 改变contentView的高度
            frame = _contentView.frame;
            frame.size.height = _tabbar.frame.origin.y;
            _contentView.frame = frame;
        }];
        
    } else {
        // 左边的返回按键
        UIButton *btn = [[UIButton alloc] init];
        UIImage *back = [UIImage imageNamed:@"navigationbar_back.png"];
        [btn setBackgroundImage:back forState:UIControlStateNormal];
        UIImage *back2 = [UIImage imageNamed:@"navigationbar_back_highlighted.png"];
        [btn addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
        [btn setBackgroundImage:back2 forState:UIControlStateHighlighted];
        btn.bounds = CGRectMake(0, 0, back.size.width, back.size.height);
        
        UIBarButtonItem *left = [[[UIBarButtonItem alloc] initWithCustomView:btn] autorelease];
        viewController.navigationItem.leftBarButtonItem = left;
        
        // 右边的home按键
        btn = [[UIButton alloc] init];
        UIImage *home = [UIImage imageNamed:@"navigationbar_home.png"];
        [btn setBackgroundImage:home forState:UIControlStateNormal];
        UIImage *home2 = [UIImage imageNamed:@"navigationbar_home_highlighted.png"];
        [btn addTarget:self action:@selector(home) forControlEvents:UIControlEventTouchUpInside];
        [btn setBackgroundImage:home2 forState:UIControlStateHighlighted];
        btn.bounds = CGRectMake(0, 0, home.size.width, home.size.height);
        
        UIBarButtonItem *right = [[[UIBarButtonItem alloc] initWithCustomView:btn] autorelease];
        viewController.navigationItem.rightBarButtonItem = right;
        
        // 跳到其他控制器，隐藏tabbar
        [UIView animateWithDuration:0.3 animations:^{
            // 隐藏tabbar
            CGRect frame = _tabbar.frame;
            frame.origin.y = self.view.bounds.size.height;
            _tabbar.frame = frame;
            
            // 改变contentView的高度
            frame = _contentView.frame;
            frame.size.height = self.view.bounds.size.height;
            _contentView.frame = frame;
        }];
        
        _currentController = viewController;
    }
}