iOS - 如果有條件，轉到頁面

Question

我想在用戶插入正確的用戶名和密碼後轉到其他頁面。怎麼做 ？ 第一個菜單是ViewController。第二種觀點是Utama。用戶名是從用戶名NSString和密碼獲取從密碼NSString。

正確的用戶名是 「Andika」 和正確的密碼是1234

故事板

ViewController.h

#import <UIKit/UIKit.h> 

@interface ViewController : UIViewController 
@property (weak, nonatomic) IBOutlet UILabel *appTittle; 
@property (weak, nonatomic) IBOutlet UITextField *usernameTextField; 
@property (weak, nonatomic) IBOutlet UITextField *passwordTextField; 
- (IBAction)okPressed:(id)sender; 

ViewController.m

#import "ViewController.h" 

@interface ViewController() 

@end 

@implementation ViewController 

    - (void)viewDidLoad { 
     [super viewDidLoad]; 
    } 

    - (void)didReceiveMemoryWarning { 
     [super didReceiveMemoryWarning]; 
    } 

    - (IBAction)okPressed:(id)sender { 

     NSString *username = [_usernameTextField text]; 
     NSString *password = [_passwordTextField text]; 

     if([username compare:@"andika"] && [password compare:@"1234"]) { 
       //???? 
     } 

    } 
@end 

Utama.m

#import "Utama.h" 

@interface Utama() 

@end 

@implementation Utama 

- (void)viewDidLoad { 
    [super viewDidLoad]; 
} 

- (void)didReceiveMemoryWarning { 
    [super didReceiveMemoryWarning]; 
} 

/* 
#pragma mark - Navigation 

// In a storyboard-based application, you will often want to do a little preparation before navigation 
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { 
    // Get the new view controller using [segue destinationViewController]. 
    // Pass the selected object to the new view controller. 
} 
*/ 

更新：對不起，我是新手。我仍然不能去另一個頁面。

我給這樣

該標識符修改後的代碼在ViewController.m

Answer 1

萬達是一個的UITabBarController右！？如果你想去上單擊確定第零標籤，給喜歡「DummyTab」到萬達視圖的標識符，並使用下面的代碼：

UITabBarController *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"DummyTab"]; 
[self.navigationController pushViewController:controller animated:YES]; 
[controller setSelectedIndex:0]; 

Answer 2

使用此代碼段來解決你的問題：

Utama *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"Utama"]; 
    [self.navigationController pushViewController:controller animated:YES]; 

Answer 3

您可以像這樣實例化Utama。

Utama *vc = [[UIStoryboard storyboardWithName:@"nameOfStoryboard" bundle:nil] instantiateViewControllerWithIdentifier:@"Utama"]; 

如果ViewController是UINavigationController，您可以使用

[self.navigationController pushViewController:vc animated:YES] 

但是，如果ViewController是窗口的RootViewController的，你可以設置vc爲rootViewController。

[window setRootViewController:vc]; 

確保window是你的應用程序的關鍵窗口的實例。

Answer 4

您需要嵌入i的導航控制器。E添加一個導航控制器，並將其設置爲初始視圖控制器和設置登錄視圖控制器作爲根視圖控制器用於導航控制器，然後在成功的憑證檢查可以推到其他視圖控制器如下

- (IBAction)okPressed:(id)sender { 

    NSString *username = [_usernameTextField text]; 
    NSString *password = [_passwordTextField text]; 

    if([username compare:@"andika"] && [password compare:@"1234"]) { 
[self.navigationController pushViewController:[self.storyboard instantiateViewControllerWithIdentifier:@"Utama storyboard identifier" animated:YES]; 
//also remove login view from stack 
[self removeFromParentViewController]; 
} 
} 

Answer 5

- (IBAction)okPressed:(id)sender 
{ 

    NSString *username = [_usernameTextField text]; 
    NSString *password = [_passwordTextField text]; 

    if ([username isEqualToString:@"andika"] == YES && [password isEqualToString:@"1234"] ==YES) 
    { 
     Utama *NextView = [[Utama alloc]initWithNibName:@"Utama" bundle:nil]; 
     [self.navigationController pushViewController:NextView animated:YES]; 
    } 

}