ios的tabbar问题求详细解答，这个tabbar下面的图标突出一块怎么做的。谢谢各位大神。

Question

Answer 1

自己自定义一个标签视图控制器吧：
自定义一个类继承自UITabBarController；
然后在该类的.m文件中自己写button和其点击事件间的切换

#import "MyTabBarController.h"

#define WIDTH (myView.frame.size.width / 4)
#define HEIGHT (myView.frame.size.height)

@interface MyTabBarController ()

//之前选中的按钮
@property(nonatomic, retain) UIButton *selectedBtn;

@end

@implementation MyTabBarController

• (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 = [[BaseView 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); //y设成负值，高再设高一点就好了!!!
  //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++) {
  UIButton *btn = [self.view viewWithTag:i];
  [btn addTarget:self action:@selector(clickBtn:) forControlEvents:UIControlEventTouchUpInside];
  }
  }

#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;

}