IOS开发控件视图day07:纯代码设置TabBar及item转跳方式
本章主要介绍如何新建一个带有三个子页面的TabBar的项目，并且第三个的个人信息界面判断未登录时转跳到登录页面
1、SceneDelegate设置主启动
(1)SceneDelegate.h中声明UIWindow
@property (strong, nonatomic) UIWindow * window;
(2)SceneDelegate.m中设置启动页及Navigation
- (void)scene:(UIScene *)scene willConnectToSession:(UISceneSession *)session options:(UISceneConnectionOptions *)connectionOptions {
//初始化目标页面对象
TBViewController *tabbarcon = [[TBViewController alloc]init];
//设置Navigation
UINavigationController *rootnav = [[UINavigationController alloc]initWithRootViewController:tabbarcon];
rootnav.navigationBarHidden = YES;
self.window.rootViewController = rootnav;
[self.window makeKeyAndVisible];
}
2、New文件
(1)新建一个继承于UITabBarController的类文件TBViewController
(2)新建三个TabBar的子页面，分别为FirstViewController、SecondViewController、ThirdViewController，以及ThirdViewController转跳到的登录界面LoginViewController
(3)新建一个继承于NSObject的Uitl文件，设置一个单例监听用户登录状态
3、TBViewController中设置子视图
(1)导入子页面头文件，声明全局对象
#import "TBViewController.h"
#import "FirstViewController.h"
#import "SecondViewController.h"
#import "ThirdViewController.h"
#import "LoginViewController.h"
#import "Uitl.h"
@interface TBViewController ()
@property(nonatomic,strong)FirstViewController *temp1;
@property(nonatomic,strong)SecondViewController *temp2;
@property(nonatomic,strong)ThirdViewController *temp3;
@property(nonatomic,strong)LoginViewController *temp4;
@property(nonatomic,strong)NSMutableArray *controllerArray;
@end
(2)构造方法设置子页面Item
@implementation TBViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self initViewControllers];
}
- (NSMutableArray *)controllerArray{
if (!_controllerArray) {
_controllerArray = [NSMutableArray new];
}
return _controllerArray;
}
//设置子页面属性（方法一）
- (void)addChildViewController:(UIViewController *)childController title:(NSString *)title imageeName:(NSString *)imageName selectImageName:(NSString *)selectImageName tag:(NSInteger)tag{
childController.tabBarItem.title = title;
childController.tabBarItem.image = [UIImage imageNamed:imageName];
childController.tabBarItem.selectedImage = [UIImage imageNamed:selectImageName];
childController.tabBarItem.tag = tag;
[self.controllerArray addObject:[[UINavigationController alloc]initWithRootViewController:childController]];
}
//设置Item（方法一）
-(void)initViewControllers
{
//初始化类对象
_temp1 = [[FirstViewController alloc]init];
//设置Item标题，选中和未选中状态下的图标以及tag值
[self addChildViewController:_temp1 title:@"首页" imageeName:@"首页" selectImageName:@"首页sel" tag:0];
_temp2 = [[SecondViewController alloc]init];
[self addChildViewController:_temp2 title:@"次页" imageeName:@"次页" selectImageName:@"次页sel" tag:1];
_temp3 = [[ThirdViewController alloc]init];
[self addChildViewController:_temp3 title:@"我的" imageeName:@"我的" selectImageName:@"我的sel" tag:2];
self.viewControllers = self.controllerArray;
self.selectedIndex = 0;//设置默认启动页为第一页，即首页
}
//选中第三个子页面时，设置未登录转跳
-(void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item
{
if (item.tag == 2) {
if ([Uitl share].isLogin) { //判断用户是否登录
return;
}
_temp4 = [[LoginController alloc]init];
[_temp4 setLoginResultBlock:^(BOOL flag,id _Nonnull loginInfo){
if (flag) {
}else{
self.selectedIndex = 0;
}
}];
[self.navigationController pushViewController:_temp4 animated:YES];
NSLog(@"didSelectItem");
}
}
@end
(3)设置Item方法二
例：SecondViewController.m
-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:@"SecondViewController" bundle:nil];
if (self) {
UITabBarItem *item2 = [[UITabBarItem alloc]initWithTitle:@"次页" image:[UIImage imageNamed:@"次页"] selectedImage:[UIImage imageNamed:@"次页sel"]];
item2.tag = 2;
self.tabBarItem = item2;
}
return self;
4、设置Uitl文件
(1)Uitl.h
@property (nonatomic,assign) BOOL isLogin;
+(Uitl *)share;
(2)Uitl.m
+(Uitl *)share
{
static Uitl *util;
static dispatch_once_t once;
dispatch_once(&once,^{
util = [[Uitl alloc]init];
});
return util;
}
5、LoginViewController页面设置登录与返回按钮
LoginViewController.h
@property (nonatomic,copy)void(^LoginResultBlock)(BOOL flag,id loginInfo);
LoginViewController.m
//返回首页按钮触发函数
-(void)back:(UIBarButtonItem *)buttonItem
{
[self.navigationController popViewControllerAnimated:YES];
NSLog(@"back");
if (self.LoginResultBlock) {
self.LoginResultBlock(NO,nil);
}
}
//登录按钮
-(void)login:(UIButton *)btn
{
LoginViewController *login = [[LoginViewController alloc]init];
[Uitl share].isLogin = YES; //设置状态为登录
[login.navigationController popViewControllerAnimated:YES];
}
6、在首页设置一个按钮btn，触发函数为setIsLogin，监听用户登录状态
FirstViewController.m
//点击按钮触发的函数
-(void)setIsLogin:(UIButton *)btn
{
if ([Uitl share].isLogin) {
[Uitl share].isLogin = NO;
[_btn setTitle:@"您未登录，点击登录" forState:UIControlStateNormal];
_btn.backgroundColor = [UIColor redColor];
}else{
LoginViewController *tmp4 = [[LoginViewController alloc]init];
[self.navigationController pushViewController:tmp4 animated:YES];
}
}
//进入首页时，按钮显示的状态
-(void) viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
if ([Uitl share].isLogin) {
[_btn setTitle:@"您已登录，点击退出" forState:UIControlStateNormal];
_btn.backgroundColor = [UIColor greenColor];
}else{
[_btn setTitle:@"您未登录，点击登录" forState:UIControlStateNormal];
_btn.backgroundColor = [UIColor redColor];
}
}