Snail—UI学习之自定义标签栏UITabBarController

这里的背景跟上面的差不多

不过这里要用到AppDelegate的单例进行传值

首先到AppDelegate.h文件中

<span style="color:#FF0000;">#import <UIKit/UIKit.h>@interface WJJRootViewController : UITabBarController//声明一UIButton属性 来记录当前按下的按钮@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 来记录当前按下的按钮@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);        //按钮平常状态下得图片        [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;    //执行下面代码 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//下面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定义的tabBarView进行传值 设置它的隐藏 就是红色字体的代码