UISCrollView无法看到底部部分，因为它返回顶部

Question

我使用UIScrollView进行测试并将UILabel放入其中。 重点是我想滚动到底部阅读整个UIlabel，但只要我停止拖动滚动视图返回下来（橡皮筋效果），我不能读取最后三行文本。

scrollView.backgroundColor = [UIColor redColor]; 
scrollView.contentSize = CGSizeMake(320, 600); 



UILabel *lbltestScroll = [[UILabel alloc]initWithFrame:CGRectMake(0,100,320,600)]; 

lbltestScroll.text =@"Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged."; 

lbltestScroll.lineBreakMode = UILineBreakModeWordWrap; 
lbltestScroll.numberOfLines = 0; 

[scrollView addSubview:lbltestScroll]; 

问题在哪里？

由于 卢卡

Answer 1

滚动视图的contentSize太小。

由于标签的大小与滚动视图的内容大小相同，但定位在0,100处，它不适合滚动视图内的可用空间。 contentSize属性与滚动视图的实际大小（您正在浏览的“窗口”）无关，而是设置可用于显示内容的“画布”的大小，并且或多或少有多远你可以滚动。