这里的背景跟上面的差点儿相同
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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