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贴一段我很久以前写的小demo，你们就明白了，是把textField套在alertView里的
@interface ViewController : UIViewController <UIAlertViewDelegate, UITextFieldDelegate>{
    UILabel *la;
    UITextField *myTextField;
}

@implementation ViewController
- (void)viewDidLoad
{
    [super viewDidLoad];

la = [[UILabel alloc] init];
    la.Frame = CGRectMake(10, 150,300,30);
    la.backgroundColor = [UIColor clearColor];
    la.font = [UIFont fontWithName:@"Helvetica-Bold" size:20];
    la.text = @"initLabel";
    la.textAlignment = UITextAlignmentCenter;
    la.shadowColor = [UIColor colorWithWhite:0.0f alpha:0.75f];
    la.shadowOffset = CGSizeMake(0.0f, 5.0f);

    la.textColor = [UIColor greenColor];

    [self.view addSubview:la];

UIButton *alartBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    alartBtn.frame = CGRectMake(110, 50, 50, 50);
    alartBtn.backgroundColor = [UIColor clearColor];
    [alartBtn setTitle:@"alart" forState:UIControlStateNormal];
    [alartBtn addTarget:self action:@selector(alartShow:) forControlEvents:UIControlEventTouchUpInside];
    [alartBtn setAlpha:1.0];
    [self.view addSubview:alartBtn];

}
-(void)alartShow:(id)sender{

    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Title" message:@"   " delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:@"OK", nil];
    [alert show];
    [alert release];

myTextField = [[UITextField alloc] initWithFrame:CGRectMake(12.0, 45.0, 260.0, 25.0)];

    [myTextField setBackgroundColor:[UIColor whiteColor]];
    [alert addSubview:myTextField];
    [myTextField setDelegate:self];

    [myTextField addTarget:self action:@selector(onTextFieldChanged:forEvent:) forControlEvents:UIControlEventEditingChanged];

NSLog(@"myTextField.text:%@", myTextField.text); 

}

- (void)alertView: (UIAlertView *)alert clickedButtonAtIndex:(NSInteger)buttonIndex {
    {

        NSLog(@"%@", myTextField.text);
        la.text = myTextField.text;

    }
}

- (void)alertView:(UIAlertView *)alert didDismissWithButtonIndex:(NSInteger)buttonIndex{
    if (buttonIndex == [alert cancelButtonIndex]) {
        close(0);
    }

}

- (void) onTextFieldChanged:(id)sender forEvent:(UIEvent *)event{

    NSLog(@"%@", myTextField.text);
}
摘出来的，大概意思应该已经有了，有用的自己在看下。。。欢迎技术交流，彼此进步。。谢谢。。