为什么更改scrollView的contentsize值不会影响结果

Question

while using scrollview i have assigned contentSize (0,508)

if i change it to (-77,508) or (150,508) shows same result.

which result in myView top side doesnot comes down (how ever if i change the value of myView to Y = 250 ) it runs good. But it doesnot look good in storyboard as myView bottom side goes way down the builder.

Any ideas, what i am doing wrong ?

Answer 1

contentSize property is responsible for (literally) the size of your content. Setting it to (150, 508) says "I want my content to be 150pt wide and 508pt tall". It defines how far side-to-side or top-to-bottom your content can scroll. It does not say anything about its actual position. If you want to change the position of the view inside the scroll view, either change the subview's frame or take a look at contentOffset property of the scroll view