在UIScrollView上浮动UIButton

Question

我想实现我的应用程序的以下行为:我有一个UIScrollView对我与定制的视图contentSize,我想提出一个UIButton在其左下角呆在那里,当我滚动我想按钮留它的确切位置是视图,滚动视图的内容同时滚动.

最好的方法是什么？谢谢!

Answer 1

你使用Interface Builder/Storyboard吗？如果是这样,那么只需添加滚动视图.然后添加Button但不要将该按钮添加为滚动视图的子视图.只需将其添加为兄弟姐妹.但请确保首先显示滚动视图.层次结构应如下所示:

\--View  (The underlaying UIView
    \--scrollView (The UIScrollView)
        \-- anyView (Any subviews of the scroll view come here
    \--button (The UIButton)

通过这样做,按钮独立于滚动视图,滚动或内容大小.它可能放在滚动视图上.

编辑:快速编程(不是语法检查等)作为编程解决方案的示例.

UIScrollView *myScroller = [[UIScrollView alloc] initWith...];
UIImageView *someImage = [[UIImageView alloc] initWith...]; //Just a sample subivew. 
UILabel *someLabel = [[UILabel alloc] initWith...]; //Another sample.
UIButton *myButton [[UIButton alloc] initWith...]; 

[self.view addSubView:myScroller];
[myScroller addSubView:someImage];
[self.view addSubView:myButton]; //it is important, that myScroller was added first
[myScroller addSubView:someLable]; //the sequence of addding subviews to the content does not matter much.

(您可能希望在滚动条视图中有一个单独的内容视图,然后是所有子驱动程序的容器.但这不会影响我尝试解释的内容.)