不兼容的指针类型使用'UITextField *'类型的表达式初始化'NSString *'

我的应用程序有问题。目前，我正在尝试将数据推送到我的PHP脚本中。但是，当我按下按钮时，整个应用程序将冻结。这是我的代码。

GuestlistViewControler.m文件

//
//  GuestlistViewControler.m
//  Club La Boom
//
//  Created by Kevin Archambault on 2014-04-21.
//  Copyright (c) 2014 Club La Boom. All rights reserved.
//

#import "GuestlistViewControler.h"

@implementation GuestlistViewControler

-(IBAction)addData:(id)sender{

    NSString *name = self.NameText;
    NSString *invite = self.InviteText;
    NSString *email = self.EmailText;
    NSString *phone = self.CellText;
    NSString *date = self.DateText;

    NSString *rawStr = [NSString stringWithFormat:@"name=%@&invite=%@&&email=%@&phone=%@&date=%@", name,
                        invite,
                        email,
                        phone,
                        date];

    NSData *data = [rawStr dataUsingEncoding:NSUTF8StringEncoding];

    NSURL *url = [NSURL URLWithString:@"http://www.clublaboom.com/guestlist_iphone.php"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:data];
    NSURLResponse *response;
    NSError *err;
    NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err];

    NSString *responseString = [NSString stringWithUTF8String:[responseData bytes]];
    NSLog(@"%@", responseString);

    NSString *success = @"success";
    [success dataUsingEncoding:NSUTF8StringEncoding];

    NSLog(@"%lu", (unsigned long)responseString.length);
    NSLog(@"%lu", (unsigned long)success.length);



    [self dismissViewControllerAnimated:YES completion:nil]; // Dismiss the viewController upon success

}

@end

GuestlistViewControler.h文件

//
//  GuestlistViewControler.h
//  Club La Boom
//
//  Created by Kevin Archambault on 2014-04-21.
//  Copyright (c) 2014 Club La Boom. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#import <CoreGraphics/CoreGraphics.h>


@interface GuestlistViewControler :
UITableViewController {
    UITextField *_NameText;
    UITextField *_InviteText;
    UITextField *_EmailText;
    UITextField *_CellText;
    UITextField *_DateText;
    UIButton *_SubmitButton;
}
@property (strong, nonatomic) IBOutlet UITableViewController *GuestlistViewControler;

@property (nonatomic, retain) IBOutlet UITextField * NameText;
@property (nonatomic, retain) IBOutlet UITextField * InviteText;
@property (nonatomic, retain) IBOutlet UITextField * EmailText;
@property (nonatomic, retain) IBOutlet UITextField * CellText;
@property (nonatomic, retain) IBOutlet UITextField * DateText;
@property (nonatomic, retain) IBOutlet UIButton * SubmitButton;

@end

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