自定义UITabBar

以微博为例，自定义TabBar,给初学者参考：

CJTabBar.h

//
//  CJTabBar.h
//  自定义Tabar
//
//  Created by CoderJee on 15/1/25.
//  Copyright (c) 2015年 CoderJee. All rights reserved.
//

#import <UIKit/UIKit.h>
@protocol CJTabBarDelegate <NSObject>

@optional

- (void)tabBarCompose;

@end
@interface CJTabBar : UITabBar
@property (nonatomic, weak)id<CJTabBarDelegate>  composeDelegate;

@end

CJTabBar.m

//
//  CJTabBar.m
//  自定义Tabar
//
//  Created by CoderJee on 15/1/25.
//  Copyright (c) 2015年 CoderJee. All rights reserved.
//

#import "CJTabBar.h"
#import "UIView+Extension.h"
@interface CJTabBar ()
@property (nonatomic, weak)UIButton *composeBtn;
@end

@implementation CJTabBar

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        
        if (![[UIDevice currentDevice].systemVersion doubleValue]>=7.0) {
            
            self.backgroundImage = [UIImage imageNamed:@"tabbar_background"];
        }
        self.selectionIndicatorImage = [UIImage imageNamed:@"navigationbar_button_background"];
        
        [self setUpComposeBtn];
    }
    return self;
}

/**
 *  发微博
 */
- (void)setUpComposeBtn
{
    // 创建UIButton
    UIButton *addBtn = [[UIButton alloc] init];
    // 设置常态下，和高亮状态下的背景图
    [addBtn setBackgroundImage:[UIImage imageNamed:@"tabbar_compose_button"] forState:UIControlStateNormal];
    [addBtn setBackgroundImage:[UIImage imageNamed:@"tabbar_compose_button_highlighted"] forState:UIControlStateHighlighted];
    
    // 设置UIButton的ImageView
    [addBtn setImage:[UIImage imageNamed:@"tabbar_compose_icon_add"] forState:UIControlStateNormal];
    [addBtn setImage:[UIImage imageNamed:@"tabbar_compose_icon_add_highlighted"] forState:UIControlStateHighlighted];
    [addBtn addTarget:self action:@selector(addClick:) forControlEvents:UIControlEventTouchUpInside];
    
    self.composeBtn = addBtn;
    [self addSubview:addBtn];
}

- (void)addClick:(UIButton *)addBtn
{
    if ([self.composeDelegate respondsToSelector:@selector(tabBarCompose)]) {
        
        NSLog(@"方法：%s
文件：%s
行数：%d",__FUNCTION__,__FILE__,__LINE__);
       // [self.composeDelegate tabBarCompose];
    }
}

// 设置子控件的frame
- (void)layoutSubviews
{
    [super layoutSubviews];
    // 设置size
    self.composeBtn.size = self.composeBtn.currentBackgroundImage.size;
    self.composeBtn.centerX = self.width * 0.5;
    self.composeBtn.centerY = self.height * 0.5;
    
    int index = 0;
    for (UIView *tabarButton in self.subviews) {
        if ([tabarButton isKindOfClass: NSClassFromString(@"UITabBarButton")]) {
            
            CGFloat tabarW = self.width/(self.items.count + 1);
            CGFloat tabarH = self.height;
            CGFloat tabarY = 0;
            if (index >= 2) {
                tabarButton.frame = CGRectMake((index + 1) * tabarW, tabarY, tabarW, tabarH);
            }else
            {
                tabarButton.frame = CGRectMake(index * tabarW, tabarY, tabarW, tabarH);
            }
            index ++;
        }
        continue;
    }
}

@end

CJTabBarController.h

//
//  CJTabBarControllerViewController.h
//  自定义Tabar
//
//  Created by CoderJee on 15/1/25.
//  Copyright (c) 2015年 CoderJee. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface CJTabBarController : UITabBarController

@end

CJTabBarController.m

//
//  CJTabBarControllerViewController.m
//  自定义Tabar
//
//  Created by CoderJee on 15/1/25.
//  Copyright (c) 2015年 CoderJee. All rights reserved.
//

#import "CJTabBarController.h"
#import "CJTabBar.h"
#import "CJNavigationController.h"
@interface CJTabBarController ()<CJTabBarDelegate>

@end

@implementation CJTabBarController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UITableViewController *home = [[UITableViewController alloc] init];
    [self addoneChildViewController:home title:@"首页" imageName:@"tabbar_home" selectedImageName:
     @"tabbar_home_selected"];
    
    UITableViewController *message = [[UITableViewController alloc] init];
    [self addoneChildViewController:message title:@"消息" imageName:@"tabbar_message_center" selectedImageName:@"tabbar_message_center_selected"];
    
    UITableViewController *discover = [[UITableViewController alloc] init];
    [self addoneChildViewController:discover title:@"发现" imageName:@"tabbar_discover" selectedImageName:@"tabbar_discover_selected"];
    
    UITableViewController *me = [[UITableViewController alloc] init];
    
    
    [self addoneChildViewController:me title:@"我" imageName:@"tabbar_profile" selectedImageName:@"tabbar_profile_selected"];
    
    CJTabBar *tabar = [[CJTabBar alloc] init];
    tabar.composeDelegate = self;
    // 主要代码
    [self setValue:tabar forKey:@"tabBar"];
}

- (void)tabBarCompose
{
    UITableViewController *compose = [[UITableViewController alloc] init];
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:compose];
    [self presentViewController:nav animated:YES completion:nil];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    
}

- (void)addoneChildViewController:(UIViewController *)childController title:(NSString *)title imageName:(NSString *)imageName selectedImageName:(NSString *)seletedImageName
{
    // 设置导航栏，tabar的title
    childController.title = title;
    
    // 设置tabar的图片
    childController.tabBarItem.image = [UIImage imageNamed:imageName];
    // 创建存储字体属性的可变字典
    NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
    dictionary[UITextAttributeTextColor] = [UIColor orangeColor];
    dictionary[UITextAttributeTextShadowOffset] = [NSValue valueWithUIOffset:UIOffsetZero];
    dictionary[UITextAttributeTextShadowColor] = [UIColor clearColor];
    [childController.tabBarItem setTitleTextAttributes:dictionary forState:UIControlStateSelected];
    
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    dict[UITextAttributeTextColor] = [UIColor blackColor];
    dict[UITextAttributeTextShadowOffset] = [NSValue valueWithUIOffset:UIOffsetZero];
    dict[UITextAttributeTextShadowColor] = [UIColor clearColor];
    [childController.tabBarItem setTitleTextAttributes:dict forState:UIControlStateNormal];
    // 设置tabar选中时的图片
    UIImage *selectedImage = [UIImage imageNamed:seletedImageName];
    if ([[UIDevice currentDevice].systemVersion doubleValue] >=7.0) {// 设置图片不可渲染(使用原图)
        selectedImage = [selectedImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    }
    childController.tabBarItem.selectedImage = selectedImage;
    
    // 创建包装子控制器的导航控制器
    CJNavigationController *nav = [[CJNavigationController alloc] initWithRootViewController:childController];
    
    // 添加自控制器
    [self addChildViewController:nav];
    
}

+ (void)initialize
{
    // 设置tabar字体的颜色, 这样也可以设置字体颜色和大小
   // UITabBarItem *item = [UITabBarItem appearance];
  //  NSMutableDictionary *dict = [NSMutableDictionary dictionary];
   // dict[NSForegroundColorAttributeName] = [UIColor blackColor];
   // [item setTitleTextAttributes:dict forState:UIControlStateNormal];
    
}

@end

CJNavigationController.h

//
//  CJNavigationController.h
//  自定义Tabar
//
//  Created by CoderJee on 15/1/25.
//  Copyright (c) 2015年 CoderJee. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface CJNavigationController : UINavigationController

@end

CJNavigationController.m

//
//  CJNavigationController.m
//  自定义Tabar
//
//  Created by CoderJee on 15/1/25.
//  Copyright (c) 2015年 CoderJee. All rights reserved.
//

#import "CJNavigationController.h"

@interface CJNavigationController ()

@end

@implementation CJNavigationController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if (self.viewControllers.count > 0) { // 如果现在push的不是栈底控制器
        // 隐藏tabar
        viewController.hidesBottomBarWhenPushed = YES;
        // 设置导航栏按钮
    }
    [super pushViewController:viewController animated:animated];
}

- (void)back
{
    [self popViewControllerAnimated:YES];
}
- (void)more
{
    [self popToRootViewControllerAnimated:YES];
}

@end

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    CJTabBarController *controller = [[CJTabBarController alloc] init];
    self.window.rootViewController = controller;
    [self.window makeKeyAndVisible];
    return YES;
}

UIView+Extension.h

//
//  UIView+Extension.h
//  DaiDaiFa
//
//  Created by coder.j on 14-10-16.
//  Copyright (c) 2014年 com.daidaifa. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIView (Extension)
@property (nonatomic, assign) CGFloat x;
@property (nonatomic, assign) CGFloat y;
@property (nonatomic, assign) CGFloat maxX;
@property (nonatomic, assign) CGFloat maxY;
@property (nonatomic, assign) CGFloat centerX;
@property (nonatomic, assign) CGFloat centerY;
@property (nonatomic, assign) CGFloat width;
@property (nonatomic, assign) CGFloat height;
@property (nonatomic, assign) CGSize size;
@property (nonatomic, assign) CGPoint origin;
@end

UIView+Extension.m

//
//  UIView+Extension.m
//  DaiDaiFa
//
//  Created by coder.j on 14-10-16.
//  Copyright (c) 2014年 com.daidaifa. All rights reserved.
//

#import "UIView+Extension.h"

@implementation UIView (Extension)

- (void)setX:(CGFloat)x
{
    CGRect frame = self.frame;
    frame.origin.x = x;
    self.frame = frame;
}

- (CGFloat)x
{
    return self.frame.origin.x;
}

- (void)setMaxX:(CGFloat)maxX
{
    self.x = maxX - self.width;
}

- (CGFloat)maxX
{
    return CGRectGetMaxX(self.frame);
}

- (void)setMaxY:(CGFloat)maxY
{
    self.y = maxY - self.height;
}

- (CGFloat)maxY
{
    return CGRectGetMaxY(self.frame);
}

- (void)setY:(CGFloat)y
{
    CGRect frame = self.frame;
    frame.origin.y = y;
    self.frame = frame;
}

- (CGFloat)y
{
    return self.frame.origin.y;
}

- (void)setCenterX:(CGFloat)centerX
{
    CGPoint center = self.center;
    center.x = centerX;
    self.center = center;
}

- (CGFloat)centerX
{
    return self.center.x;
}

- (void)setCenterY:(CGFloat)centerY
{
    CGPoint center = self.center;
    center.y = centerY;
    self.center = center;
}

- (CGFloat)centerY
{
    return self.center.y;
}

- (void)setWidth:(CGFloat)width
{
    CGRect frame = self.frame;
    frame.size.width = width;
    self.frame = frame;
}

- (CGFloat)width
{
    return self.frame.size.width;
}

- (void)setHeight:(CGFloat)height
{
    CGRect frame = self.frame;
    frame.size.height = height;
    self.frame = frame;
}

- (CGFloat)height
{
    return self.frame.size.height;
}

- (void)setSize:(CGSize)size
{
//    self.width = size.width;
//    self.height = size.height;
    CGRect frame = self.frame;
    frame.size = size;
    self.frame = frame;
}

- (CGSize)size
{
    return self.frame.size;
}

- (void)setOrigin:(CGPoint)origin
{
    CGRect frame = self.frame;
    frame.origin = origin;
    self.frame = frame;
}

- (CGPoint)origin
{
    return self.frame.origin;
}
@end