UIAlertView内部的UIAlertView

Question

我是iOS编程的新手，我有一个关于UIAlertViews的问题，正如主题所建议的那样。

我有一个删除SQLite DB中记录的按钮。这些按钮调用一个UIAlertview，在删除记录时为用户提供几个不同的选项。

- (IBAction)deleteFunction:(id)sender {
UIAlertView *delChoice = [[UIAlertView alloc] initWithTitle:@"Select from below." message:@"WARNING!:You are about to remove records. This is irreversible." delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Delete Completed jobs",@"Delete All records",@"Select items to delete.", nil];
[delChoice show];
}

下面是下一个方法

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
NSString *title =[alertView buttonTitleAtIndex:buttonIndex];
if([title isEqualToString:@"Delete All records"]){
    [database executeUpdate:@"delete from issues"];

    if([database lastErrorCode]!=NULL){
        UIAlertView *unconfirm = [[UIAlertView alloc]initWithTitle:@"Failure!" message:@"Something went wrong. Try one more time." delegate:self cancelButtonTitle:@"ok" otherButtonTitles:nil];
        [unconfirm show];
    }else {
        UIAlertView *confirm = [[UIAlertView alloc]initWithTitle:@"Success!" message:@"All records have been removed." delegate:self cancelButtonTitle:@"ok" otherButtonTitles:nil];
        [confirm show];
    }
}

这不是完整的方法。我的问题是，在嵌套的uialertview视图中(取消确认和确认)，如果我决定添加"otherButtonTitles“，我该如何响应它们？我是不是在同一个main方法中做了同样的事情？

另外，如果有更好的方法，我将不胜感激！

Answer 1

我能想到的最好的方法就是

- (IBAction)deleteFunction:(id)sender 
{
    UIAlertView *delChoice = [[UIAlertView alloc] initWithTitle:@"Select from below." 
                                                        message:@"WARNING!:You are about to remove records. This is irreversible." 
                                                       delegate:self 
                                              cancelButtonTitle:@"Cancel" 
                                              otherButtonTitles:@"Delete Completed jobs",@"Delete All records",@"Select items to delete.", nil];

    [delChoice setTag:1]; // Setting the tag can help determine which view has come into a method call.
    [delChoice show];

}

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

    switch([alertView tag]) {
        case 1:
              NSString *title =[alertView buttonTitleAtIndex:buttonIndex];
              if([title isEqualToString:@"Delete All records"]){
                  [database executeUpdate:@"delete from issues"];

                  if([database lastErrorCode]!=NULL){
                      UIAlertView *unconfirm = [[UIAlertView alloc] initWithTitle:@"Failure!" 
                                                                     message:@"Something went wrong. Try one more time." 
                                                                    delegate:self 
                                                           cancelButtonTitle:@"ok" 
                                                           otherButtonTitles:nil];
                      [unconfirm setTag:2];
                      [unconfirm show];
                   } else {
                      UIAlertView *confirm = [[UIAlertView alloc] initWithTitle:@"Success!" 
                                                                     message:@"All records have been removed." 
                                                                    delegate:self 
                                                           cancelButtonTitle:@"ok" 
                                                           otherButtonTitles:nil];
                     [confirm setTag:3];
                     [confirm show];
                   }
             }
         break;
         case 2:
                // Do what you wish here for if UIAlertView has tag 2
                break;
         case 3:
                // Do what you wish here for if UIAlertView has tag 3
                break;
         default:
                // If you have any other UIAlertViews that have some basic default functionality you can do that here.
                break;
     }
}

那么这里到底发生了什么呢？我们为每个UIAlertViews设置一个标签，当我们在任何UIAlertViews上按下一个按钮时，我们就会进入这个alertView: clickedButtonAtIndex:方法。因此，我们使用已设置的UIAlertViews标记在switch statement中选择正确的大小写。我们使用UIAlertViews标签并选择正确的大小写，因此如果是([alertView tag] == 1)，那么我们将对另一个UIAlertViews执行case 1，依此类推。然后我们有一个默认的用例，所以如果你决定需要另一个UIAlertView，你可以添加另一个用例，这样case 3或者你可以用默认的用例来处理默认的功能。不要忘记每个案例结束时的空格，如果你错过了最后的break;，则语句将继续执行，无论哪个案例低于那个案例。希望对您有所帮助，如果您有任何问题，请留言。

Answer 2

您可以在UIAlertview中添加更多按钮，但使用tag属性来区分每个警报视图。就像-

UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"FlurtR" message:ERROR_INTERNET delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
alert.tag=11;
[alert show];

当你必须评估的时候，你已经按下了OK或cancel按钮，使用这个

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (alertView.tag==11 && buttonIndex==0)
    {
        [self hideIndicator];
        checkForAlertView=0;
    }
}

您还可以在任何UIAlertView中的- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex方法中定义tag属性，您可以在其中检查警报标记和按钮索引，而不会出现任何问题。

希望这能有所帮助。

Answer 3

 // Yes you can do with this same thing but i suggest you to compare with ButtonIndex instead of string value like

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
   if (buttonIndex == 0) {
       NSLog(@"Clicked button index 0");
      // Add the action here
   } else {
       NSLog(@"Clicked button index other than 0");
      // Add another action here
   }
}