Alertview for textfile 适用于 ios7，但不适用于 ios6.1

Question

    if ([district.text isEqualToString:@""])
    {
        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Alert" message:@"Please fill the fields" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
    }
    else if([myTextField.text isEqualToString:@""])
    {
        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Alert" message:@"Please fill the fields" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
    }
    else if ([catname.text isEqualToString:@""])
    {
        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Alert" message:@"Please fill the fields" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
    }
    else if([msg.text isEqualToString:@""])
    {
        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Alert" message:@"Please fill the fields" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
    }

这是我的代码，它在ios7中完美运行，但在ios6中则不然。 我应该进行哪些更改才能在iOS 6.1上运行

Answer 1

您无法在 iOS 7 中轻松更改 UIAlertView 的视图层次结构。（你也不应该;文档特别告诉你不要这样做。前往开发人员论坛查看有关它的长时间讨论。

在您的情况下，一种替代方法是设置 alert.alertViewStyle = UIAlertViewStylePlainTextInput;这将为您添加一个文本字段。您可以使用 UITextField *textField = [alertView textFieldAtIndex：0]; 在 UIAlertView 委托回调中访问它。

例：

UIAlertView *alertView = [[UIAlertView alloc]
                              initWithTitle:@"Alert"
                              message:@"enter your details:"
                              delegate:self
                              cancelButtonTitle:@"Cancel"
                              otherButtonTitles:@"Ok", nil];
    [alertView setAlertViewStyle:UIAlertViewStylePlainTextInput];
    /* Display a numerical keypad for this text field */
    UITextField *textField = [alertView textFieldAtIndex:0];
    textField.keyboardType = UIKeyboardTypeNumberPad;
[alertView show];