自己定义UITabBarController

Posted 2020-06-13

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网上大多的自己定义TabBar都是继承View的，项目中要用到path+Tabbat这种话(path用的MMDrawerController这个框架)，继承View的Tabbar是无法满足条件的（不是一个容器）。以下就介绍下自己写的一个自己定义TabBar。

和系统自带的写法差点儿相同，先看下原生的写法例如以下：

首先在.h中自己定义一个UITabBarController* tabBarViewController; 接着在.m中来做实现，

tabBarViewController = [[UITabBarController alloc]init];
   
    
    FirstViewController* first = [[FirstViewController alloc]init];
    UINavigationController * navOne = [[UINavigationController alloc] initWithRootViewController:first ];
    [navOne setNavigationBarHidden:TRUE];
   
    SecondViewController* second = [[SecondViewController alloc]init];
    UINavigationController * navtwo = [[UINavigationController alloc] initWithRootViewController:second ];
    [navtwo setNavigationBarHidden:TRUE];
    
    ViewController3 *vc3 = [[ViewController3 alloc] init];
    UINavigationController * nav3 = [[UINavigationController alloc] initWithRootViewController:vc3 ];
    [nav3 setNavigationBarHidden:TRUE];
    ViewController5 *vc5 = [[ViewController5 alloc] init];
    UINavigationController * nav5 = [[UINavigationController alloc] initWithRootViewController:vc5 ];
    [nav5 setNavigationBarHidden:TRUE];
    
    tabBarViewController.viewControllers = [NSArray arrayWithObjects:navOne, navtwo,nav3,nav5, nil];
    [first release];
    [second release];
    [vc3 release];
    [vc5 release];
    
    UITabBar *tabBar = tabBarViewController.tabBar;
    UITabBarItem *tabBarItem1 = [tabBar.items objectAtIndex:0];
    UITabBarItem *tabBarItem2 = [tabBar.items objectAtIndex:1];
    UITabBarItem *tabBarItem3 = [tabBar.items objectAtIndex:2];
    UITabBarItem *tabBarItem4 = [tabBar.items objectAtIndex:3];
    
    tabBarItem1.title = @"消息";
    tabBarItem2.title = @"应用";
    tabBarItem3.title = @"通讯录";
    tabBarItem4.title = @"我";
    
    [tabBarItem1 setFinishedSelectedImage:[UIImage imageNamed:@"home_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"home.png"]];
    [tabBarItem2 setFinishedSelectedImage:[UIImage imageNamed:@"maps_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"maps.png"]];
    [tabBarItem3 setFinishedSelectedImage:[UIImage imageNamed:@"myplan_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"myplan.png"]];
    [tabBarItem4 setFinishedSelectedImage:[UIImage imageNamed:@"settings_selected.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"settings.png"]];
    UIImage* tabBarBackground = [UIImage imageNamed:@"tabbar.png"];
    [[UITabBar appearance] setBackgroundImage:tabBarBackground];
   [[UITabBar appearance] setSelectionIndicatorImage:[UIImage imageNamed:@"tabbar_selected.png"]];
    
    [[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                       [UIColor whiteColor], UITextAttributeTextColor,
                                                       nil] forState:UIControlStateNormal];
   UIColor *titleHighlightedColor = [UIColor greenColor];
   [[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                       titleHighlightedColor, UITextAttributeTextColor,
                                                       nil] forState:UIControlStateSelected];

以下来看下自己定义的方法，也是在.h文件里定义

UITabBarController* tabBarViewController;

在定义一个long preSelect变量，这个变量用来推断点击是哪个selectedIndex。

在.m中的详细实现例如以下：

 NSMutableArray *arrController = [[NSMutableArray alloc]init];
    //信息
    MessageViewController *messageVC = [[MessageViewController alloc]initWithNibName:@"MessageViewController" bundle:nil];
    
    UINavigationController * navMessage = [[UINavigationController alloc] initWithRootViewController:messageVC ];
    [messageVC release];
    
    [navMessage setNavigationBarHidden:TRUE];
    [arrController addObject:navMessage];
    [navMessage release];
    //应用
    AppsViewController *appsVC = [[AppsViewController alloc]initWithNibName:@"AppsViewController" bundle:nil];
    
    UINavigationController *navApps = [[UINavigationController alloc] initWithRootViewController:appsVC];
    [appsVC release];
    [navApps setNavigationBarHidden:TRUE];
    [arrController addObject:navApps];
    [navApps release];
    //通讯录
    AddressViewController *addressVC = [[AddressViewController alloc]initWithNibName:@"AddressViewController" bundle:nil];
    
    UINavigationController *navAddress = [[UINavigationController alloc] initWithRootViewController:addressVC];
    [addressVC release];
    [navAddress setNavigationBarHidden:TRUE];
    [arrController addObject:navAddress];
    [navAddress release];
    //我
    MeViewController *meVC = [[MeViewController alloc]initWithNibName:@"MeViewController" bundle:nil];
    
    UINavigationController *navMe = [[UINavigationController alloc] initWithRootViewController:meVC];
    [meVC release];
    [navMe setNavigationBarHidden:TRUE];
    [arrController addObject:navMe];
    [navMe release];
    
    
    tabBarViewController=[[UITabBarController alloc] init];
    
    tabBarViewController.viewControllers=arrController;
    [arrController release];
    preSelect = 1;
    for (int i = 0; i<4; i++) {
        NSString *nalString = [NSString stringWithFormat:@"tabbar_unselecte%d.png", i+1];
        NSString *highString = [NSString stringWithFormat:@"tabbar_selected%d.png", i+1];
        UIImage *nalImage = [UIImage imageNamed:nalString];
        UIImage *highImage = [UIImage imageNamed:highString];
        
        UIButton *tabbarBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        tabbarBtn.frame = CGRectMake(i*(320/4), 0, (320/4), 46);
        [tabbarBtn addTarget:self action:@selector(tabbarBtnPress:) forControlEvents:UIControlEventTouchUpInside];
        [tabbarBtn setBackgroundImage:nalImage forState:UIControlStateNormal];
        [tabbarBtn setBackgroundImage:highImage forState:UIControlStateSelected];
        tabbarBtn.tag = 100+i;
        [tabBarViewController.tabBar addSubview:tabbarBtn];
        
        if (i == 1) {
            tabbarBtn.selected = YES;
            tabBarViewController.selectedIndex=1;
        }
    }

主要是思路就是自己定义UITabBarController的tabBar属性，在它上面addSubview。因为加的UIButton，如今就要实现点击

方法来切换。

方法例如以下：

-(void)tabbarBtnPress:(UIButton *)tabbarBtn
{
    if (preSelect != tabbarBtn.tag -100 ) {
        
        UIButton *prvBtn = (UIButton *)[tabbarBtn.superview viewWithTag:preSelect+100];
        prvBtn.selected = NO;
        
        tabBarViewController.selectedIndex = preSelect = tabbarBtn.tag-100;
        
        UIButton *button = (UIButton *)[tabbarBtn.superview viewWithTag:tabbarBtn.tag];
        button.selected = YES;
    }
}

到此就完毕了。有什么不正确地方请大家指出来。

5.29日补充：

上面写的是默认是选中第2个tabbar，选中第一个时。仅仅须要改动preSelect =0;和

if(i==0)

{

tabbarBtn.selected =YES;

self.selectedIndex=0;

}

假设想把这个独立出来，仅仅须要定义一个继承UITabBarController的类。

假设想用自己定义的背景也能够。能够把系统的给隐藏(self.tabBar.hidden =YES;)，自己定义一个View,加到tabbar上。[self.view addSubview:xxxx]; ，其他还是用上面的方法。

6.3：

发现了一个问题。VC的nav不显示，找了下原因，发现 tabbarController.viewControllers 中设置是VC数组，不是nav数组。