Iphone 在objective c中为不同的UIAlert分离事件处理程序

好的，假设我有2个uialerts，并且在这两种情况下都将委托设置为self，第一个uialerts包含（ok&download）按钮第二个包含（cancel&upload）按钮现在我们需要单独的事件处理程序知道吗

要在UIView中处理多个UIAlertView，必须为每个UIView设置唯一的标记

    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"title" message:@"szMsg" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:@"download"];
    [alert show];
    [alert release];

    - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
    {
        if (buttonIndex == 0)
        {
            //Code for OK button
        }
        if (buttonIndex == 1)
        {
            //Code for download button
        }
    }

在从委托方法获取响应的同时，使用唯一的标记管理每个方法

    alert.tag = 123;

---

尝试为两个不同的

UIAlertView

实例设置

tag

属性，然后在回调中再次检查这些标记，并在那里执行其余操作，例如：

    - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
    {
        if(alertView.tag == 123)
        {
            if (buttonIndex == 0)
            {
                //Code for OK button
            }
            else if (buttonIndex == 1)
            {
                //Code for download button
            }
       }
       else if(alertView.tag == 456)
       {
            // code to manage another alertview response.
       }
    }

这是委托回调

UIAlertView *alertDownload = [[UIAlertView alloc]initWithTitle:@"title" message:@"szMsg" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:@"download"];
    alertDownload.tag = 1;
    [alertDownload show];
    [alertDownload release];


UIAlertView *alertUpload = [[UIAlertView alloc]initWithTitle:@"title" message:@"szMsg" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:@"upload"];
    alertUpload.tag = 2;
    [alertUpload show];
    [alertUpload release];

---

如果有很多警报视图或委托方法很复杂，则可以创建一个控制器（一个简单的

NSObject

子类）来管理每个警报视图，例如

downloadConfirmationalController

。然后，您的主控制器可以存储对子控制器的引用。

但请使用枚举或#定义标记值。我讨厌看到各种各样的

.tag=1234

和带有tag:1234代码的视图。使用命名常量<代码>如果（alertView.tag==kDownloadAlertView）{…}更具可读性！神奇的数字是个坏主意。不是

123

，而是为每个警报视图声明一个带有值的

enum

。例如，enum ClassNameAlertViews{ClassNameConfirmCancelDownloadAlert=123，ClassNameConfirmOtherUserAction，您可以通过AddingUndoSupportAlert=234}删除它们@迈克·韦勒和本尼迪克特·科恩：当然可以，先生。感谢您的反馈。只需显式地将第一个枚举值设置为1，然后自动分配其余的枚举值。我不知道这件“1234”的事情是从哪里来的，但似乎每个人都这么做了。

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
     if(alertView.tag == 1) {
          //Here you do your stuff for Download
     }
     if(alertView.tag == 2) {
         //Here you do stuff for Upload
     }
}

               my_Alert = [[UIAlertView alloc]initWithTitle:@"Hi" message:@"Hello" delegate:self
                cancelButtonTitle:@"OK" otherButtonTitles:@"Cancel",nil];
             my_Alert.frame = CGRectMake(462, 359, 400, 50);

             my_Alert.tag = 1;

               my_Alert = [[UIAlertView alloc]initWithTitle:@"Hi" message:@"Hello" delegate:self
                cancelButtonTitle:@"OK" otherButtonTitles:@"Cancel",nil];
             my_Alert.frame = CGRectMake(462, 359, 400, 50);

                              my_Alert.tag = 2;

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

   if (buttonIndex==0 && my_Alert.tag == 1)
    {   

      NSLog(@"Perform action on button touch of index 0 of First Alert");
    }
      else
       {
             NSLog(@"Perform action on button touch of index 1 of First Alert");
       }

    if (buttonIndex==0 && my_Alert.tag == 2)
   {  
   NSLog(@"Perform action on button touch of index 0 of Second Alert");         
   }
           else
       {
             NSLog(@"Perform action on button touch of index 1 of Second Alert");
       }
  }