IOS开发之三级控制器的使用与自定义标签工具栏

三级控制器的概念：UITabBarController- ->(管理) UINavigationController -->(管理) UIViewController

下面笔者就分享一下三级控制器的使用

#import "MainTabbarController.h"

#import "ProfileViewController.h"

#import "GroupViewController.h"

#import "SearchViewController.h"

#import "CommentViewController.h"

#import "MessageViewController.h"

@interface UITabBarController ()

@end

@implementation UITabBarController

- (void)viewDidLoad {

   //创建三级控制器

   [self _creatView];

   //自定义标签工具栏

   [self _newInitTabbar];

}

- (void)_creatView{

    //1.创建视图控制器并把视图控制器添加到数组中

    ProfileViewController *profileCtrl = [[[ProfileViewController alloc] init] autorelease];

    GroupViewController *groupCtrl = [[[GroupViewController alloc] init] autorelease];

    SearchViewController *searchCtrl = [[[SearchViewController alloc] init] autorelease];

    CommentViewController *commentCtrl = [[[CommentViewController alloc] init] autorelease];

    MessageViewController *messageCtrl = [[[MessageViewController alloc] init] autorelease];

    //将视图控制器存放到数组中

    NSArray *viewCtrls = @[profileCtrl,groupCtrl,searchCtrl,commentCtrl,messageCtrl];

    //2.创建导航控制器并把视图控制器交给导航控制器管理，并且把导航控制器也添加到连一个数组中

}

//自定义标签工具栏

- (void)_newInitTabbar {

    //(1)移除工具栏上的按钮

    //取得tabbar上的所有子视图

    NSArray *views = [self.tabBar subviews];

    for (UIView *view in views) {

        [view removeFromSuperview];

    }

    //(2)设置背景

    self.tabBar.backgroundImage = [UIImage imageNamed:@"navbg"];

    //(3)创建按钮

    CGFloat width = [UIScreen mainScreen].bounds.size.width;

    //每一个按钮的宽度

    CGFloat w =  width/5;

    for (int i=0; i<5; i++) {

        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

        NSString *imageName = [NSString stringWithFormat:@"%d",i+1];

        [button setImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];

        //设置frame

        button.frame = CGRectMake((w-42)/2+w*i, 2, 42, 45);

        //添加一个点击事件

        [button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];

        [self.tabBar addSubview:button];

    }

    //(4)创建选中图片

    _selectedImg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"选中"]];

    _selectedImg.frame = CGRectMake((w-53)/2.0, 2, 53, 45);

    [self.tabBar addSubview:_selectedImg];

}

//按钮的点击事件

- (void)buttonAction:(UIButton *)button {

    //切换视图控制器

    self.selectedIndex = button.tag;

    //动画

    [UIView beginAnimations:nil context:nil];

    [UIView setAnimationDuration:.2];

    _selectedImg.center = button.center;

    [UIView commitAnimations];

}