实现UIScrollView从上到下滚动

修改下面功能：

- (void)layoutScrollImages
{
UIImageView *view= nil;  
NSArray *subviews= [scrollView1 subviews];  

CGFloat curXLoc= 0;  
for (view in subviews) 
{  
  if ([view isKindOfClass:[UIImageView class]] && view.tag> 0)   
  {  
      CGRect frame= view.frame;        
     frame.origin= CGPointMake(0,curXLoc);    
      view.frame= frame;       
    curXLoc+= (kScrollObjHeight);       
 } 
  }  
  [scrollView1 setContentSize:CGSizeMake(([scrollView1 bounds].size.width),kNumImages* kScrollObjHeight)];
 }