Question

我是一个xcode noob，但这就是我正在寻找的东西，然后是我所做的。我已经创建了一个登录名，并使用该登录用户名我正在尝试验证用户并打开一个特定于该人的网页。登录在这里是我的所有代码

//LoginViewController.h


    #import <UIKit/UIKit.h>
    @interface LoginViewController : UIViewController
    {
    IBOutlet UITextField *usernameField;
    IBOutlet UITextField *passwordField;
    IBOutlet UIButton *loginButton;   
    IBOutlet UIActivityIndicatorView *loginIndicator;
    }

    @property(nonatomic, strong) UITextField *usernameField;
    @property(nonatomic, strong) UITextField *passwordField;
    @property(nonatomic, strong) UIButton    *loginButton;
    @property(nonatomic, strong) UIActivityIndicatorView *loginIndicator;

    -(IBAction) login: (id) sender;
    @end


//LoginViewController.m


    #import "LoginViewController.h"
    @implementation LoginViewController
    @synthesize usernameField, passwordField, loginButton, loginIndicator;

    -(IBAction) login: (id) sender
    {
    if ([usernameField.text isEqualToString: @"userOne"] && [passwordField.text
    isEqualToString: @"passwordOne"])
    {
    printf("Success")
    //here is where I would like to pass usernameField.text to WebViews
    }
    else if (([usernameField.text isEqualToString: @"userTwo"] && [passwordField.text 
    isEqualToString: @"passwordTwo"])
    {
    printf("Success")
    //here is where I would like to pass usernameField.text to WebViews
    }
    else
    {
    printf("Login Failed")
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Login Failed"
                 message:@"Wrong username and password" delegate:self
                 cancelButtonTitle:@"Done"
                 otherButtonTitles:nil];
    [alert show];
    }
    loginIndicator.hidden=False;
    [loginIndicator startAnimating];
    }
    -(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
    {
    if([[segue identifier] isEqualToString:@"fromLogin"])
    {
        WebViews *wvc = [segue destinationViewController];
        wvc.usernamerField = self.usernameField.text;
    }
    }
    @end

//WebViews.h

    @interface WebViews : UIViewController
    {
    IBOutlet UIWebView *webView;
    NSString *usernameField;
    }
    @property (nonatomic, strong) NSString*usernameField;

    @end

//WebViews.m

 #import "WebViews.h"
    @interface WebViews ()//To be honest I'm not sure what this is for
    @end
    @implementation WebViews
    @synthesize usernameField;

    -(void)viewDidLoad
    {
    [super viewDidLoad];
    NSLog(@"username is = %@", self.usernameField);
    if([T.usernameField.text isEqualToString: @"userOne"])
    {
    [webView loadRequest: [NSURLRequest requestWithURL: [NSURL 
    URLWithString:@"http://www.google.com"]]];
    }
    else if([T.usernameField.text isEqualToString: @"userTwo"])
    {
    [webView loadRequest: [NSURLRequest requestWithURL: [NSURL URLWithString:@"http://www.yahoo.com"]]];
    }
    else
    {
    [webView loadRequest: [NSURLRequest requestWithURL: [NSURL URLWithString:@"http://www.wikipedia.com"]]];
    }

    @end

非常感谢任何帮助

Answer 1

您的问题是，您永远不会向T分配任何内容，因此您的方法中的内容为nil。

在LoginViewController的代码中，您需要将用户名传递给WebViewController。您可以通过实施prepareForSegue方法来完成此操作。

以下是一个取自How to pass prepareForSegue: an object

的示例

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Make sure your segue name in storyboard is the same as this line
    if ([[segue identifier] isEqualToString:@"YOUR_SEGUE_NAME_HERE"])
    {
        // Get reference to the destination view controller
        WebViewController *wvc = [segue destinationViewController];

        // Pass any objects to the view controller here, like...
        wvc.username = self.usernameField.text;
    }
}

检查用户输入后的webview

1 个答案: