Question

第一个警报的按钮执行第二个警报，这基本上是给某人打电话的确认。我没有收到任何错误，但它不起作用当我按下第二个警报时，呼叫按钮会崩溃

-(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

您已分配在第二个警报视图中委派为nil。这就是第二次不调用alertView:clickedButtonAtIndex:委托方法的原因。因此，您应该将委托分配为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/..../"]];
                  }

 }

我认为这会对你有所帮助。

Answer 2

延迟启动第二个警报。问题是 - 警报需要一些时间来隐藏自己，在任何新警报出现之前，因此直接调用第二个警报将无效。

试试这个例子：

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

    NSString *buttonString = [alertView buttonTitleAtIndex:buttonIndex];
    if ([buttonString isEqualToString:@"Phone"]) 
    {
        [self performSelector:@selector(callSecondAlertView) withObject:nil afterDelay:1];
    }
}

- (void)callSecondAlertView
{
    //show new alert view
    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];

    [alert2 release];
}

如果不起作用或延迟时间过长 - 请使用afterDelay:值。

Answer 3

得到了它！出于某种原因，[[[alertView subviews] objectAtIndex：6] setBackgroundColor ...对于fisrt alertView按钮我干扰了第二个alertView功能。虽然直到我将xcode更新为4.4.1

，但xcode并没有直接指出问题

Answer 4

使用alertView:didDismissWithButtonIndex:委托方法代替alertView:clickedButtonAtIndex:委托方法。警报消失后调用前者。当您想要根据第一个警报视图的点按按钮显示秒时，这会更有意义。

还为UIAlertview对象提供标记。

AlertView里面的AlertView

4 个答案: