iphone - iphone sdk 4.3 中按钮点击的警报消息

Question

我是xcode编程初学者，请告诉我如何在xcode-iphone-4.3中单击按钮时显示警报消息

我的代码如下，

- (IBAction)buttonPressed:(id)sender{

    UIAlertView* mes=[[UIAlertView alloc] initWithTitle:@"Hello World!!!!!!" 
                                                    message:@"This is the Iphone app" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles: nil];

    [mes show];

    [mes release];

请帮我解决这个问题。

Answer 1

-(IBAction)buttonOnePressed:(id)sender
 {
     UIAlertView *alert = [[UIAlertView alloc]initWithTitle: @"Clicked button 1"
                  message: @"Alert Message here"
                  delegate: self
                  cancelButtonTitle:@"Cancel"
                  otherButtonTitles:@"OK",nil];

     [alert setTag:1];
     [alert show];
 }

-(IBAction)buttonTwoPressed:(id)sender
 {
     UIAlertView *alert = [[UIAlertView alloc]initWithTitle: @"Clicked button 2"
                  message: @"Alert Message here"
                  delegate: self
                  cancelButtonTitle:@"Cancel"
                  otherButtonTitles:@"OK",nil];

     [alert setTag:2];
     [alert show];
 }

下面是跟踪 Alertview 上哪个按钮被点击的委托(delegate)方法。

  -(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex   
   {
     if (alertView.tag == 1) { // UIAlertView with tag 1 detected
       if (buttonIndex == 0) 
       {
            NSLog(@"user pressed Button Indexed 0");
            // Any action can be performed here
       }
       else 
       {
            NSLog(@"user pressed Button Indexed 1");
            // Any action can be performed here
       }
     }

    else if (alertView.tag == 2) { // UIAlertView with tag 2 detected
       if (buttonIndex == 0) 
       {
            NSLog(@"user pressed Button Indexed 0");
            // Any action can be performed here
       }
       else 
       {
            NSLog(@"user pressed Button Indexed 1");
            // Any action can be performed here
       }
     }
   }

如果您有多个 UIAlertView，并且可以确定在其委托(delegate)中单击了哪个 UIAlertView 按钮，您可以将标记设置为 UIAlertView方法 clickedButtonAtIndex 使用其各自的标签。