iOS7的UIScrollView中奇怪的contentSize

Question

I add a scrollview as a subview by using the storyboard.

here is my code

[self.bottomScrollView setBackgroundColor:[UIColor greenColor]];
UIView* v = [[UIView alloc] initWithFrame:self.bottomScrollView.bounds];
[v setBackgroundColor:[UIColor redColor]];
[self.bottomScrollView addSubview:v];
[self.bottomScrollView setContentSize:v.frame.size];

in which self.bottomScrollView is the subview which is added by storyboard. I think because the contentsize is equal to the view v and the frame of v start from (0,0), the scrollview should not be able to be moved either horizontally or vertically.

However, the result is quite strange, the bottomScrollView still can be scrolled viertically as the following image shows.(this is not the bounce)

Acutally, I tried add a scrollview programly and it works correct. Why this happens? Any bugs of storyboard?

Answer 1

将NO设置为self.automaticallyAdjustsScrollViewInsets属性，则滚动视图将不会显示这种“奇怪的”偏移量

Answer 2

contentSize of your bottomScrollView should have been changed after you set it with code. Try to move the code setting contentSize of bottomScrollView to viewWillAppear: