代码之家 › 专栏 › 技术社区 › user1580957

通过在xcode中单击按钮启用和禁用选项卡栏项目?

tabbar uitabbar uitabbarcontroller uiviewcontroller xcode

user1580957 · 技术社区 · 12 年前

我有5个选项卡栏项目。第一个将是登录页面。当用户尚未登录时,其他选项卡项将被禁用,但当用户通过单击navigationItem按钮登录时,所有其他4个选项卡项都将被启用。

我进行了搜索,但一无所获…:(

这是我的代码:

MainTabViewController.h
#import <UIKit/UIKit.h>

@interface MainTabViewController : UITabBarController
@property (retain, nonatomic) IBOutlet UITabBar *MainTabBar;

@end


MainTabViewController.m

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


    UITabBarItem *tabBarItem = [[MainTabBar items] objectAtIndex:1];
    [tabBarItem setEnabled:FALSE];


}

LoginViewController.h



#import <UIKit/UIKit.h>

@interface LoginViewController : UIViewController
@property (retain, nonatomic) IBOutlet UITextField *CustomerUsername;
@property (retain, nonatomic) IBOutlet UITextField *CustomerPassword;
- (IBAction)ResignKeyboardClicked:(id)sender;

@end

LoginViewController.m

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

    UIBarButtonItem *btnGo = [[UIBarButtonItem alloc] initWithTitle:@"Login"     style:UIBarButtonItemStyleBordered target:self action:@selector(loginAction)];
    self.navigationItem.rightBarButtonItem = btnGo;

}

- (void) LoginAction {
     AppDelegate *passData = (AppDelegate *)[[UIApplication sharedApplication] delegate];

        if ([CustomerUsername.text isEqualToString:@""] || [CustomerPassword.text     isEqualToString:@""]) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"alert" message:@"Please Fill     all the field" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];

        return;
    }
    // i will use a code from connect to DB tutorial
    NSString *strURL = [NSString stringWithFormat:@"http://localhost:8888/Staff.php?userName=%@&password=%@",CustomerUsername.text, CustomerPassword.text];

    // to execute php code
    NSData *dataURL = [NSData dataWithContentsOfURL:[NSURL URLWithString:strURL]];

    // to receive the returend value
    NSString *strResult = [[NSString alloc] initWithData:dataURL encoding:NSUTF8StringEncoding];


    if ([strResult isEqualToString:@"1"])
    {
        //MainTabViewController *main = [[MainTabViewController alloc] initWithNibName:nil bundle:nil];
        //UITabBarItem *tabBarItem = [[main.MainTabBar items] objectAtIndex:1];
        //[tabBarItem setEnabled:TRUE];

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Success" message:@"You are now Logged In" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];

    return;
    }
    else
    {
        // invalid information
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"alert" message:@"Invalide Information" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];

        return;

    }
}

目前,我的代码只禁用了其他4个选项卡栏项目,但我不知道在用户登录时如何启用所有选项卡栏项目。

请帮忙?

谢谢!:D

2 回复 | 直到 12 年前

CÅur Gustavo Armenta 7 年前

我不得不说,我是iOS开发的初学者,我想我可以帮助你。

在情节提要中制作一个TabBarController和所有其他UIViewController。将它们链接到TabBarController,并为它们添加赋值类。在您的情况下,其中一个UIViewController将被称为LoginViewController。现在,当您的应用程序启动时,LoginViewControl必须是第一个选项卡,您只需添加以下代码即可禁用选项卡:

[[[[self.tabBarController tabBar]items]objectAtIndex:1]setEnabled:FALSE];
[[[[self.tabBarController tabBar]items]objectAtIndex:2]setEnabled:FALSE];
[[[[self.tabBarController tabBar]items]objectAtIndex:3]setEnabled:FALSE];

同样,您可以通过以下方式启用它们:

[[[[self.tabBarController tabBar]items]objectAtIndex:1]setEnabled:TRUE];
[[[[self.tabBarController tabBar]items]objectAtIndex:2]setEnabled:TRUE];
[[[[self.tabBarController tabBar]items]objectAtIndex:3]setEnabled:TRUE];

因此,您的登录操作功能将如下所示:

- (void) LoginAction {
     AppDelegate *passData = (AppDelegate *)[[UIApplication sharedApplication] delegate];

        if ([CustomerUsername.text isEqualToString:@""] || [CustomerPassword.text     isEqualToString:@""]) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"alert" message:@"Please Fill     all the field" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];

        return;
    }
    // i will use a code from connect to DB tutorial
    NSString *strURL = [NSString stringWithFormat:@"http://localhost:8888/Staff.php?userName=%@&password=%@",CustomerUsername.text, CustomerPassword.text];

    // to execute php code
    NSData *dataURL = [NSData dataWithContentsOfURL:[NSURL URLWithString:strURL]];

    // to receive the returend value
    NSString *strResult = [[NSString alloc] initWithData:dataURL encoding:NSUTF8StringEncoding];

    if ([strResult isEqualToString:@"1"]) {
        //MainTabViewController *main = [[MainTabViewController alloc] initWithNibName:nil bundle:nil];
        //UITabBarItem *tabBarItem = [[main.MainTabBar items] objectAtIndex:1];
        //[tabBarItem setEnabled:TRUE];

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Success" message:@"You are now Logged In" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];

        [[[[self.tabBarController tabBar]items]objectAtIndex:1]setEnabled:TRUE];
        [[[[self.tabBarController tabBar]items]objectAtIndex:2]setEnabled:TRUE];
        [[[[self.tabBarController tabBar]items]objectAtIndex:3]setEnabled:TRUE];

        return;
    }
    else {
        // invalid information
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"alert" message:@"Invalide Information" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];

        return;
    }
}

我希望它能有所帮助:D

ChavirA 10 年前

我从@RonzyFonzy更新了解决方案,以使用N个选项卡栏项目:

 for (UITabBarItem *tmpTabBarItem in [[self.tabBarController tabBar] items])
           [tmpTabBarItem setEnabled:NO];