如何通过iphone中的“下一步”按钮在滚动视图中显示下一幅图像

我在滚动视图中有图像它正在从阵列加载图像我还想这样，当我按下下一个按钮时，下一个图像应该出现我已经完成了在滚动视图中加载图像的以下代码我想转到上一个和下一个图像按按钮单击当我单击下一个按钮时，它不会显示下一个图像

-(void) loadNews{

 NSURL*myurl=url; 

  myurl = [myurl stringByReplacingOccurrencesOfString:@"\n" withString:@""];
  myurl = [myurl stringByTrimmingCharactersInSet:[NSCharacterSet   whitespaceCharacterSet]]; 



  NSURL*urlloaded= [[NSURL alloc]initWithString:myurl];
 //NSURL*url= [[NSURL alloc]initWithString:@"http://localhost:8888/RowOne.xml"];
  NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithContentsOfURL:urlloaded];

  //Initialize the delegate.

   RowTwoParser *parser = [[RowTwoParser alloc] initXMLParser];

  //Set delegate

   [xmlParser setDelegate:parser];   
   BOOL success = [xmlParser parse];

  if(success)

   NSLog(@"No Errors");

   else

  NSLog(@"Error Error Error!!!");



  int k=0;
  for (int  i=0; i < [appDelegate.articles count]; i++) {



   CGRect frame;
   frame.origin.x = self.scrollView.frame.size.width * i;
   frame.origin.y = 0;
   frame.size = self.scrollView.frame.size;
   UIView*subView=[[UIView alloc ]initWithFrame:frame];
   [self.scrollView addSubview:subView];
   RowTwo*aRowTwo=[appDelegate.articles objectAtIndex:i];



   CGRect mywebframe=CGRectMake(20, 60, 728, 800);

   UIImageView*imageView=[[UIImageView alloc] initWithFrame:mywebframe];  


   NSString*thumb2=aRowTwo.image;

   thumb2 = [thumb2 stringByReplacingOccurrencesOfString:@"\n" withString:@""];
   thumb2 = [thumb2 stringByTrimmingCharactersInSet:[NSCharacterSet   whitespaceCharacterSet]];



   NSURL *url = [NSURL URLWithString:thumb2];
   NSData *data = [[NSData alloc] initWithContentsOfURL:url];
   UIImage *image2 = [[UIImage alloc] initWithData:data];
   imageView.image =image2 ; 

   [subView addSubview:imageView];
   k++;
    }  

    //NSInteger numberofPages=10-j;
    NSInteger numberofPages=[appDelegate.articles count];
   self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width *   numberofPages, self.scrollView.frame.size.height);
  CGRect frame;
  //frame.origin.x = self.scrollView.frame.size.width * self.pageControl.currentPage;
  frame.origin.x = self.scrollView.frame.size.width * myindex;
  frame.origin.y = 0;
  frame.size = self.scrollView.frame.size;
  [self.scrollView scrollRectToVisible:frame animated:YES];



  [pageControl setNumberOfPages:numberofPages];
  [pageControl setActivePageColor:[UIColor clearColor]];
  [pageControl setInactivePageColor:[UIColor clearColor]];  

   }

---

如果它们在滚动视图中，则使用

CGPoint offset = CGPointMake(xPositionToScroll, yPositionToScroll);
[self.scrollView setContentOffset:topOffset animated:YES];

---

到某个特定的点。

您没有发布现在发生的事情-我假设它失败了，但是在编译时？运行时间？你看到了什么消息？现在它显示了所有即将出现的图像并可以滚动它们我想要的意思是加载时我有3个图像我应该通过按钮单击移动到下一个图像我添加了下一个按钮代码，你现在可以检查

  //NSInteger numberofPages=10-j;
  NSInteger numberofPages=[appDelegate.articles count];
  self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * numberofPages, self.scrollView.frame.size.height);
 CGRect frame;
 //frame.origin.x = self.scrollView.frame.size.width * self.pageControl.currentPage;
 frame.origin.x = self.scrollView.frame.size.width * myindex;
 frame.origin.y = 0;
  frame.size = self.scrollView.frame.size;
 [self.scrollView scrollRectToVisible:frame animated:YES];



  [pageControl setNumberOfPages:numberofPages];
  [pageControl setActivePageColor:[UIColor clearColor]];
  [pageControl setInactivePageColor:[UIColor clearColor]];  


 }

CGPoint offset = CGPointMake(xPositionToScroll, yPositionToScroll);
[self.scrollView setContentOffset:topOffset animated:YES];