键盘不适用于 uiactionsheet 中的文本字段

我在 uiactionsheet 中添加了 textfeld 作为

-(void)showAction {
 printf("getting action ready \n");
 UIActionSheet *asheet = [[UIActionSheet alloc] initWithTitle:@"New Sheet Name" delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles: nil];
       [asheet showInView:self.view];  
       [asheet setFrame:CGRectMake(0, 70, 320,200)];
       UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(0, 100,200, 25)];
 textField.borderStyle= UITextBorderStyleRoundedRect;
 [textField becomeFirstResponder];
 [textField setKeyboardType:UIKeyboardTypeAlphabet];
 [textField setKeyboardAppearance:UIKeyboardAppearanceAlert];
 textField.text=@"test" ;
 textField.delegate=self;
 [asheet insertSubview:textField atIndex:0];
 [textField release];
 [asheet release];
}

但键盘不适用于此文本字段，但退格键可以使用。 以前，当我使用 ios 3 时，它工作正常，但使用 ios 3.2 iphone 模拟器 4.0 不接受来自键盘的任何输入

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
 printf("\n textFieldShouldBeginEditing\n ");
 return YES;
}

只需使用这种对我有用的方式

首先在类 .h 文件中设置 UITextFieldDelegate,UIActionSheetDelegate

#定义TEXT_FIELD_TAG 9999

#定义 ACTION_SHEET_TAG 8888

-(IBAction)ForgotPassword:(id)sender{


     UIActionsheet  *actFollowUp = [[UIActionSheet alloc] initWithTitle:@"Please Enter Email"
                                                      delegate:self
                                                              cancelButtonTitle:@"Cancel"
                                                                      destructiveButtonTitle:@"OK"
                                                              otherButtonTitles:nil];

actFollowUp.tag=ACTION_SHEET_TAG;

textFieldTime = [[UITextField alloc] initWithFrame:CGRectMake(60.f,320.f, 200.f, 30.f)];
[textFieldTime setBackgroundColor:[UIColor whiteColor]];
textFieldTime.delegate= self;
[textFieldTime setKeyboardType:UIKeyboardTypeAlphabet];
textFieldTime.keyboardAppearance= UIKeyboardAppearanceAlert;
textFieldTime.tag=TEXT_FIELD_TAG;

[actFollowUp addSubview:textFieldTime];

UIWindow*   appWindow = [UIApplication sharedApplication].keyWindow;

[actFollowUp showInView:appWindow];
[actFollowUp setFrame:CGRectMake(0.0,200.0, 320.0, 200.0)];

[self performSelector: @selector(acceptInput:) withObject: actFollowUp];

}

 -(void)acceptInput: (UIActionSheet*)actionSheet
{

 UITextField*    textField = (UITextField*)[actionSheet viewWithTag:TEXT_FIELD_TAG];

UIWindow*       appWindow = [UIApplication sharedApplication].keyWindow;

CGRect          frame     = textField.frame;

[appWindow insertSubview:textField aboveSubview:actionSheet];

frame.origin.y += 60.0; // move text field to same position as on action sheet

textField.frame = frame;

}