首先创建一个类，继承自UItabBarController
然后在.m文件中：
这里我有两个宏定义：
#define WIDTH (myView.frame.size.width / 4) //我在写4个按钮（即4个标签，所以是所有宽度除以4） #define HEIGHT (myView.frame.size.height)
然后写延展，声明了一个按钮属性，用来记录上一个被点击的按钮（这是用来改变颜色，即点击状态的）：
@interface MyTabBarController () //之前选中的按钮 @property(nonatomic, retain) UIButton *selectedBtn; @end
然后开始写自己想要的东西了，在viewDidLoad中：
（1）删除继承父类而来的tabBar，自定义自己想要的视图，其frame为原来tabBar的frame。
（2）然后定义了4个按钮和4个label，即标签和标签下的标题
（3）然后循环给4个按钮添加点击事件，触发事件是同一个clickBtn
- (void)viewDidLoad {
[super viewDidLoad];
//删除现有的tabBar
CGRect rect = self.tabBar.frame;
[self.tabBar removeFromSuperview];
//添加自己的视图
UIView *myView = [[UIView alloc] init];
myView.backgroundColor = [UIColor whiteColor];
myView.frame = rect;
[self.view addSubview:myView];
//主页发现按钮
UIButton *findBtn = [UIButton buttonWithType:UIButtonTypeCustom];
[findBtn setImage:[UIImage imageNamed:@"icon_home_n"] forState:UIControlStateNormal];
[findBtn setImage:[UIImage imageNamed:@"icon_home_h"] forState:UIControlStateSelected];
findBtn.tag = 1;
findBtn.frame = CGRectMake(0, -20, WIDTH, HEIGHT);
//默认选中是发现按钮
findBtn.selected = YES;
[findBtn setTintColor:[UIColor colorWithRed:0.886 green:0.365 blue:0.247 alpha:1.000]];
self.selectedBtn = findBtn;
[myView addSubview:findBtn];
UILabel *findLabel = [[UILabel alloc] initWithFrame:CGRectMake(WIDTH/2 -10, HEIGHT - 20, WIDTH, 20)];
findLabel.text = @"发现";
findLabel.textColor = [UIColor colorWithRed:0.804 green:0.325 blue:0.227 alpha:1.000];
findLabel.font = [UIFont systemFontOfSize:10];
findLabel.tag = 101;
[myView addSubview:findLabel];
[findLabel release];
//搜索页
UIButton *searchBtn = [UIButton buttonWithType:UIButtonTypeCustom];
[searchBtn setImage:[UIImage imageNamed:@"icon_search_n"] forState:UIControlStateNormal];
[searchBtn setImage:[UIImage imageNamed:@"icon_search_h"] forState:UIControlStateSelected];
searchBtn.tag = 2;
searchBtn.frame = CGRectMake(WIDTH, -20, WIDTH, HEIGHT);
[myView addSubview:searchBtn];
UILabel *searchLabel = [[UILabel alloc] initWithFrame:CGRectMake(WIDTH + WIDTH/2 -10, HEIGHT - 20, WIDTH, 20)];
searchLabel.text = @"搜索";
searchLabel.textColor = [UIColor grayColor];
searchLabel.font = [UIFont systemFontOfSize:10];
searchLabel.tag = 102;
[myView addSubview:searchLabel];
[searchLabel release];
//收藏页
UIButton *costBtn = [UIButton buttonWithType:UIButtonTypeCustom];
[costBtn setImage:[UIImage imageNamed:@"iconfont-like"] forState:UIControlStateNormal];
[costBtn setImage:[UIImage imageNamed:@"iconfont-like-selected"] forState:UIControlStateSelected];
costBtn.tag = 3;
costBtn.frame = CGRectMake(2 * WIDTH, -20, WIDTH, HEIGHT);
[myView addSubview:costBtn];
UILabel *collectLabel = [[UILabel alloc] initWithFrame:CGRectMake(2 * WIDTH + WIDTH/2 -10, HEIGHT - 20, WIDTH, 20)];
collectLabel.text = @"收藏";
collectLabel.textColor = [UIColor grayColor];
collectLabel.font = [UIFont systemFontOfSize:10];
collectLabel.tag = 103;
[myView addSubview:collectLabel];
[collectLabel release];
//设置页
UIButton *setUpBtn = [UIButton buttonWithType:UIButtonTypeCustom];
[setUpBtn setImage:[UIImage imageNamed:@"icon_setting_n"] forState:UIControlStateNormal];
[setUpBtn setImage:[UIImage imageNamed:@"icon_setting_h"] forState:UIControlStateSelected];
setUpBtn.tag = 4;
setUpBtn.frame = CGRectMake(3 * WIDTH, -20, WIDTH, HEIGHT);
[myView addSubview:setUpBtn];
UILabel *setUpLabel = [[UILabel alloc] initWithFrame:CGRectMake(3 * WIDTH + WIDTH/2 -10, HEIGHT - 20, WIDTH, 20)];
setUpLabel.text = @"设置";
setUpLabel.textColor = [UIColor grayColor];
setUpLabel.font = [UIFont systemFontOfSize:10];
setUpLabel.tag = 104;
[myView addSubview:setUpLabel];
[setUpLabel release];
for (int i = 1; i <4; i++) { //4个按钮的点击事件是一个
UIButton *btn = [self.view viewWithTag:i];
[btn addTarget:self action:@selector(clickBtn:) forControlEvents:UIControlEventTouchUpInside];
}
}
（4）然后实现按钮的点击事件clickBtn:实现按钮和其下面标题 选择和未选择状态的切换；也需要实现视图的跳转：
#pragma mark -- 自定义tabBar按钮的点击事件
-(void)clickBtn:(UIButton *)sender {
//设置上一个按钮
self.selectedBtn.selected = NO;
UILabel *titleFormer = [self.view viewWithTag:self.selectedBtn.tag + 100];
titleFormer.textColor = [UIColor grayColor];
//设置选中状态
sender.selected = YES;
self.selectedBtn = sender;
UILabel *titleNow = [self.view viewWithTag:self.selectedBtn.tag + 100];
titleNow.textColor = [UIColor colorWithRed:0.804 green:0.325 blue:0.227 alpha:1.000];
//跳转相应的视图控制器
self.selectedIndex = sender.tag - 1;
}
然后就基本实现了一个视图控制器的功能了，自己还有什么需求可以往里加，使用就跟视图的标签视图一样使用就行，只是这里的按钮图片我都是在类里就赋值好了；
这是我自定义的tabBarController下载地址，需要的可以下下来参考参考：
http://download.csdn.net/detail/margaret_mo/9451753