ios - scrollViewDidScroll 不进入条件

Question

我已经设置了 scrollView 委托(delegate)并将逻辑实现到 scrollViewDidScroll 协议(protocol)方法中，如下所示，它永远不会进入第二种情况。我想知道我错过了什么？

-(void)scrollViewDidScroll: (UIScrollView*)scrollView
{
    float scrollViewHeight = scrollView.frame.size.height;
    float scrollOffset = scrollView.contentOffset.y;

    if (scrollOffset == 0)
    {
        // then we are at the top
    }
    else if (scrollOffset + scrollViewHeight == 700.0)
    {
       // never calls here 
       [self loadSecondFromURL];
    }
}

Answer 1

我认为 scrollOffset 为零，它只进入第一个循环。我这样更改了代码，对我来说效果很好

if (scrollOffset == 0)
{
    // then we are at the top
}

if (scrollOffset + scrollViewHeight == 700.0)
{
   // never calls here 
   [self loadSecondFromURL];
}