UIAlertView带textField

UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"校验登录密码" message:@"" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];

    alert.alertViewStyle = UIAlertViewStyleSecureTextInput;

    alert.tag = 33;

    UITextField *t = [alert textFieldAtIndex:0];

    t.placeholder = @"请输入登录密码";

[alert show];