iPhone-SDK：在iOS 4中向UIAlertview添加文本框无法工作？

Question

我正在尝试将uitextfield添加到我的alterview中。当用户尝试输入文本时，alterview应该向上移动一点，以免键盘重叠，并且在按下完成键时，键盘应该消失，alertview应该恢复原位。

当我在iOS 3.1.2（和3.2）中运行它时，所有功能都正常工作，但是一旦我尝试在iOS 4下运行它，alertview显示在错误的位置，键盘无法消失。有什么建议吗？这是我的代码：

- (void)addItemAction{

workoutName = [[UIAlertView alloc] initWithTitle:@"New Workout" message:@"Insert the name of your new workout:\n                " delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Done", nil];
workoutName.cancelButtonIndex = 0;
UITextField *titleField = [[UITextField alloc] initWithFrame:CGRectMake(12.0, 90.0, 260.0, 25.0)];
titleField.delegate = self;
titleField.borderStyle = UITextBorderStyleRoundedRect;
titleField.returnKeyType = UIReturnKeyDone;
[workoutName addSubview:titleField];
[workoutName show];


}
- (BOOL)textFieldShouldReturn:(UITextField *)textField {


[textField resignFirstResponder];
return YES;

}

- (void)textFieldDidBeginEditing:(UITextField *)textField {

[UIView beginAnimations:nil context:NULL];
CGAffineTransform myTransform = CGAffineTransformMakeTranslation(0.0, -70.0);
[workoutName setTransform:myTransform];
[UIView commitAnimations];

}

- (void)textFieldDidEndEditing:(UITextField *)textField {

[UIView beginAnimations:nil context:NULL];
CGAffineTransform myTransform = CGAffineTransformMakeTranslation(0.0, 0.0);
[workoutName setTransform:myTransform];
[UIView commitAnimations];
self.newWorkout = textField.text;

}

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{

if (buttonIndex == 1) {
    if (self.newWorkout != @"TestWorkout"){
    [self.workoutPlanArray insertObject:[NSDictionary dictionaryWithObjectsAndKeys:self.newWorkout, @"titleValue", @"04.08.10", @"dateValue", nil] atIndex:counter];
    counter++;
    [self.tableView reloadData];
    }
}


}

- Christoph v

Answer 1

我在我的应用程序中还使用了带有文本字段的alertview，而且是在iOS 4.0上。 它正常工作。

这里是示例代码:_

-(void)showAlert{

showAlert=YES; //boolean variable

createNewAlert =[[UIAlertView alloc] initWithTitle:@"ADD item" message:@"Put it blank textfield will cover this" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil];

UITextField *txtName = [[UITextField alloc] initWithFrame:CGRectMake(12.0, 45.0, 260.0, 25.0)];
txtName.text=@"";
[txtName setBackgroundColor:[UIColor whiteColor]];
[txtName setKeyboardAppearance:UIKeyboardAppearanceAlert];
[txtName setAutocorrectionType:UITextAutocorrectionTypeNo];

[txtName setTextAlignment:UITextAlignmentCenter];
[createNewAlert addSubview:txtName];


[createNewAlert show];
}

您可以参考以下两种方法，它们被称为键盘通知。

-(void)keyboardWillShow: (id) notification {

if(showAlert==YES)
{

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3];
    [createNewAlert setTransform:CGAffineTransformMakeTranslation(0,-60)];
    [createNewAlert show];
    [UIView commitAnimations];
}

}

-(void)keyboardWillHide: (id) notification {

if(showAlert==YES) 
{


        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:0.3];
        [createNewAlert setTransform:CGAffineTransformMakeTranslation(0,+60)];

        [UIView commitAnimations];

}
}

- iPhoneDev

Answer 2

我也遇到了这个问题，它在iOS 4中是新的。我试图对其进行翻译，但意译并不重要，只要调用了翻译就可以。

myAlert = my AlertView
CGAffineTransform rotate = CGAffineTransformMakeTranslation(0.0f, 0.0f);
myAlert.transform = rotate;
[myAlert show];
[myAlert release];

翻译过程中必须触发回调函数，但这可以解决问题。它应该像iOS 4.0之前那样运作。

- Andrew Goodwin

Answer 3

这是一个更简洁的UIAlertView与UITextField结合的实现：DDAlertPrompt或EGOTextFieldAlertView。

- WrightsCS

Answer 4

我还不清楚警告的位置，但你可以尝试在textFieldShouldReturn实现中发送resignFirstResponder到alertView。

此外，这应该会使键盘消失（即使我不知道确切原因）。

- jozi

Answer 5

打开 xib 文件，点击 UIView 并确保 "User Interaction Enabled" 复选框被勾选。

- Mike