如何将文本字段值带入 xcode Obj c 中的其他视图控制器?

问题描述

我在 PHP MySQL 数据库和 PHP 代码中有这个 email = 'abc' 和 pw = '123' 值，如下所示.

I have this email = 'abc' and pw = '123' value in PHP MySQL database and PHP code as below.

login2.php

<?php
$connect = mysqli_connect("localhost","","","");
if(isset($_POST['email'])) {
    $email = $_POST['email'];
    $pw    = $_POST['pw'];
    $sql   = "SELECT * FROM table WHERE email='$email' AND pw=md5('$pw')";
    $get   = mysqli_query($connect,$sql);

    if($get && mysqli_num_rows($get) > 0) {
        while($row = mysqli_fetch_assoc($get)) {
            $email_db = $row['email'];
            $pw_db    = $row['pw'];
            echo '{"success":1}';
            exit();
        }
        mysqli_free_result($get);
    } else {
        echo '{"success":0}';
        echo mysqli_error($connect);
        exit();
    }
}
?>

我想在 xcode 中实现的是将 success 值带入其他名为 HomepageVC 的 ViewController 中，并在单击登录按钮操作时显示该值.

What I want to achieve in xcode is to bring the success value into other ViewController called HomepageVC and display the value when loginbutton action is clicked.

现在我只能在同一个 ViewController 页面上查看文本字段值.我不知道如何将输入值传输到另一个 ViewController.Obj c 代码如下.

Right now i can only view the textfield value on the same ViewController page. I don't know how to transfer the input value into another ViewController. Obj c code as below.

ViewController.m

@synthesize displayL,passL,email,pw;

- (IBAction)loginbutton:(id)sender
{
    @try {

        if([[email text] isEqualToString:@""] || [[pw text] isEqualToString:@""] ) {
            [self alertFailed:@"Please enter both Username and Password" :@"Login Failed!"];
        }
        else {
            NSString *post =[[NSString alloc] initWithFormat:@"email=%@&pw=%@",[email text],[pw text]];
            NSLog(@"PostData: %@",post);
            NSURL *url=[NSURL URLWithString:@"http://localhost/login2.php"];
            NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
            NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];

            NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
            [request setURL:url];
            [request setHTTPMethod:@"POST"];
            [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
            [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
            [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
            [request setHTTPBody:postData];

            NSError *error = [[NSError alloc] init];
            NSHTTPURLResponse *response = nil;
            NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
            NSLog(@"Response code: %d", [response statusCode]);
            if ([response statusCode] >=200 && [response statusCode] <300)
            {
                NSString *responseData = [[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding];
                NSLog(@"Response ==> %@", responseData);
                SBJsonParser *jsonParser = [SBJsonParser new];
                NSDictionary *jsonData = (NSDictionary *) [jsonParser objectWithString:responseData error:nil];
                NSLog(@"%@",jsonData);
                NSInteger success = [(NSNumber *) [jsonData objectForKey:@"success"] integerValue];
                NSLog(@"%d",success);
                if(success == 1)
                {
                    NSLog(@"Login SUCCESS");
                    [self alertStatus:@"Logged in Successfully." :@"Login Success!"];
                    NSString * input  = email.text;
                    NSString * input2 = pw.text;
                    displayL.text = input;
                    passL.text = input2;

                } else {
                    NSString *error_msg = (NSString *) [jsonData objectForKey:@"error_message"];
                    [self alertFailed:error_msg :@"Login failed"];
                }
            } else {
                if (error) NSLog(@"Error: %@", error);
                [self alertFailed:@"Connection Failed" :@"Login Failed!"];
            }
        }
    }
    @catch (NSException * e) {
        NSLog(@"Exception: %@", e);
        [self alertStatus:@"Login Failed." :@"Login Failed!"];
    }
}

推荐答案

如果你想使用从 currentViewController 到 nextViewController 的 textfield 的值，你可以使用 NSUserDefaults.

If you want to use values of textfield from currentViewController to nextViewController, you can use NSUserDefaults.

将您的文本字段值存储在一个字符串中.例如 Txtfldstring

store your textfield value in one string. for example Txtfldstring

Txtfldstring= [NSString stringWithFormat:@"%@",_yourTextField.text];

然后按照以下方式存储该文本字段值:

Then store that textfield value like following way:

NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
// saving an NSString

[prefs setObject:Txtfldstring forKey:@"abc"];

在 nextViewController 或任何其他控制器中使用此值，如下所示；

Use this value in nextViewController or any other Controller like following way;

NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
// getting an NSString
NSString *s = [prefs stringForKey:@"abc"];
NSLog(@"%@",s);

这篇关于如何将文本字段值带入 xcode Obj c 中的其他视图控制器?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！