IOS开发，autolayout中uiscrollview的由于contentsize的引起的问题

通过翻阅众多资料，虽然有不少的解决方案，但是当实际操作过程中，发现只有一个方法有用，参考网址:http://stackoverflow.com/questions/19036228/uiscrollview-scrollable-content-size-ambiguity-xcode-5-ios-7-interface-builder

解决方案为：

So I just sorted out in this way:

1. Add in the UIScrollView a UIView (we can call that contentView);

2. In this contentView, set top, bottom, left and right margin to 0 (of course from the scrollView which is the superView); Set also align center horizontally and vertically;

Finished.

Now you can add all your view in that contentView, and the contentSize of the scrollView will be automatically resized according with the contentView.

一个外国网友对于该问题的回答。亲测可行，并且将 Set also align center horizontally and vertically;改成equal width 和 equal height也可行，

具体其他参考网页如:http://stackoverflow.com/questions/15773815/storyboard-uiscrollview-contentsize

http://segmentfault.com/blog/lingchen/1190000002462033

http://grayluo.github.io/WeiFocusIo/autolayout/2015/01/27/autolayout3/

http://stackoverflow.com/questions/19036228/uiscrollview-scrollable-content-size-ambiguity-xcode-5-ios-7-interface-builder