Snail—UI学习之自己定义标签栏UITabBarController

这里的背景跟上面的差点儿相同

只是这里要用到AppDelegate的单例进行传值

首先到AppDelegate.h文件里

<span style="color:#FF0000;">#import <UIKit/UIKit.h>

@interface WJJRootViewController : UITabBarController

//声明一UIButton属性 来记录当前按下的button
@property (nonatomic,strong) UIButton * selectedButton;

@end</span>

然后到RootViewController.h中

#import <UIKit/UIKit.h>

@interface WJJRootViewController : UITabBarController

//声明一UIButton属性 来记录当前按下的button
@property (nonatomic,strong) UIButton * selectedButton;

@end

接下来进入到RootViewController.m中

#import "WJJRootViewController.h"
#import "WJJFirstViewController.h"
#import "WJJSecondViewController.h"
#import "WJJThirdViewController.h"
#import "WJJForthViewController.h"
<span style="color:#FF0000;">#import "WJJAppDelegate.h"</span>


@interface WJJRootViewController ()

@end

@implementation WJJRootViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

//标签栏的高度是49像素

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

- (void)createMyTabBar{
    
    //获取系统tabBar的位置
    CGRect frame = self.tabBar.frame;
    
    //创建一个UIView
    UIView * tabBarView = [[UIView alloc] initWithFrame:frame];
    tabBarView.backgroundColor = [UIColor blackColor];
    [self.view addSubview:tabBarView];
    
    <span style="color:#FF0000;">//把创建的tabBarView赋值给delegate的tabBarView属性
    WJJAppDelegate * delegate = [UIApplication sharedApplication].delegate;
    delegate.tabBarView = tabBarView;
    </span>
    
    //循环创建四个按钮 放到tabBarItem上
    CGFloat xSpace = (self.view.frame.size.width - 4 * 30) / 5;
    for (int i = 0; i < 4; i++) {
        UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.frame = CGRectMake(xSpace + i * (30 + xSpace), 9.5, 30, 30);
        //按钮寻常状态下得图片
        [button setImage:[UIImage imageNamed:[NSString stringWithFormat:@"tab_%d.png",i]] forState:UIControlStateNormal];
        //按钮点击时得图片颜色
        [button setImage:[UIImage imageNamed:[NSString stringWithFormat:@"tab_c%d.png",i]] forState:UIControlStateSelected];
        [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
        button.tag = 100 + i;
        [tabBarView addSubview:button];
        
        if (100 == button.tag) {
            //把第一个创建的按钮 设为默认
            button.selected = YES;
            //把点击的按钮 记录下来
            self.selectedButton = button;
        }
    }
}

- (void)click:(UIButton *)button{
    
    self.selectedButton.selected = YES;
    //运行以下代码 就能使得按不同的button调到不同界面
    self.selectedIndex = button.tag - 100;
    button.selected = YES;
    //把点击的按钮再次记录下来
    self.selectedButton = button;
    
}

- (void)createViewControllers{
    WJJFirstViewController * first = [[WJJFirstViewController alloc] init];
    
    UINavigationController * firstNav = [[UINavigationController alloc] initWithRootViewController:first];
    
    WJJSecondViewController * second = [[WJJSecondViewController alloc] init];
    
    WJJThirdViewController * third = [[WJJThirdViewController alloc] init];
    
    WJJForthViewController * forth = [[WJJForthViewController alloc] init];
    
    self.viewControllers = @[firstNav,second,third,forth];
}

- (void)viewDidAppear:(BOOL)animated{
    [super viewDidAppear:animated];
    //当此界面出现时 让系统的标签栏隐藏
    self.tabBar.hidden = YES;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

然后进入到FirstViewController.m中 跟之前的是一样的代码

#import "WJJFirstViewController.h"
#import "WJJFirstChildViewController.h"


@interface WJJFirstViewController ()

@end

@implementation WJJFirstViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor greenColor];
    [self createButton];
}

- (void)createButton{
    
    UIButton * rightButton = [UIButton buttonWithType:UIButtonTypeSystem];
    rightButton.frame = CGRectMake(0, 0, 50, 20);
    [rightButton setTitle:@"下一页" forState:UIControlStateNormal];
    [rightButton addTarget:self action:@selector(nextPage) forControlEvents:UIControlEventTouchUpInside];
    UIBarButtonItem * rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:rightButton];
    self.navigationItem.rightBarButtonItem = rightBarButtonItem;
    
}

- (void)nextPage{
    
    WJJFirstChildViewController * child = [[WJJFirstChildViewController alloc]init];
    [self.navigationController pushViewController:child animated:YES];
    
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

再次进入到FirstChildViewController.m 中

#import "WJJFirstChildViewController.h"
<span style="color:#FF0000;">#import "WJJAppDelegate.h"
</span>
@interface WJJFirstChildViewController ()

@end

@implementation WJJFirstChildViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

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

//用AppDelegate的单例模式传值


//以下两个方法是进入到子界面时 tabBarView消失或隐藏
- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
   <span style="color:#FF0000;"> WJJAppDelegate * delegate = [UIApplication sharedApplication].delegate;
    delegate.tabBarView.hidden = YES;</span>
}

- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    <span style="color:#FF0000;">WJJAppDelegate * delegate = [UIApplication sharedApplication].delegate;
    delegate.tabBarView.hidden = NO;</span>

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

在这里。我们是用得Appdelegate的单例模式进行对自己定义的tabBarView进行传值 设置它的隐藏 就是红色字体的代码