ios - 警报 View 内的警报 View

Question

第一个警报中的按钮会执行第二个警报，这基本上是调用某人的确认。我没有收到任何错误，但它不起作用。
当我按下第二个警报的“调用”按钮时，它崩溃了

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

     NSString *buttonString = [alertView buttonTitleAtIndex:buttonIndex];
     if ([buttonString isEqualToString:@"Phone"]) 
     {    
          UIAlertView *alert2 = [[UIAlertView alloc] initWithTitle:@"Notice!" message:@"You are about to call .... Do you wish to continue?" delegate:nil cancelButtonTitle:@"Cancel" otherButtonTitles:@"Call", nil];    
          [alert2 show];

          if ([buttonString isEqualToString:@"Call"]){

              [[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"tel://12345678"]]];

          }

          if([buttonString isEqualToString:@"Website"]){

              [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"website"]];
          }

          if ([buttonString isEqualToString:@"Facebook"]){

             [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://www.facebook.com/groups/..../"]];

          }
     }
}

Answer 1

您在第二个警报 View 中将委托(delegate)指定为 nil。这就是为什么 alertView:clickedButtonAtIndex: 委托(delegate)方法不会在第二次调用。因此，您应该将委托(delegate)指定为 self。

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

                  NSString *buttonString = [alertView buttonTitleAtIndex:buttonIndex];

                  if([buttonString isEqualToString:@"Phone"]) {

                  UIAlertView *alert2 = [[UIAlertView alloc] initWithTitle:@"Notice!" message:@"You are about to call .... Do you wish to continue?" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Call", nil];
                  [alert2 show];
                  }

                  if([buttonString isEqualToString:@"Call"]){

                     [[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"tel://12345678"]]];
                  } 

                  if([buttonString isEqualToString:@"Website"]){

                    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"website"]];
                  }


                  if([buttonString isEqualToString:@"Facebook"]){

                     [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://www.facebook.com/groups/..../"]];
                  }

 }

我想这对你会有帮助。