AlertView内部的alertView

Question

第一个警报中的一个按钮执行第二个警报，这基本上是对呼叫某人的确认。我没有得到任何错误，但它不工作。

当我按下第二个警报时，呼叫按钮就会崩溃

-(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

您在第二个警报视图中将委派分配为nil。这就是第二次不调用alertView:clickedButtonAtIndex:委托方法的原因。所以你应该将委托赋值为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的。

Answer 2

延迟启动第二个警报。问题是- alert需要一段时间来隐藏自己，然后才能出现任何新的警报，因此直接调用第二个警报将不起作用。

例如，请尝试执行以下操作：

- (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];
}

如果不工作，或者延迟太长-使用afterDelay:值播放。

Answer 3

明白了!由于某种原因，[[alertView subviews objectAtIndex:6] setBackgroundColor...对于第一个alertView按钮，我有干扰第二个alertView功能。但是，直到我将xcode更新到4.4.1之后，xcode才直接指向这个问题