iOS 滚动视图不会使用自动布局滚动，并以编程方式添加视图

Question

I have a ViewController with a scrollView and a content View inside. Some labels and stuff inside the Content View as well.

Now after that, when the view load i have to pass in data from other places to this view controller , and then load some other views by code.

The scrollview Content height and height did get updated, and i did place the loading and adding of the views at ViewWillAppear . But even if the content size is bigger than the height of the scrollview , i just can't scroll it.

Scroll View Height: 667 . Scroll View Content Height : 1632 ContentView Height : 1632

Answer 1

Your scrollview did not scrolled because you gave fixed size to content view.

Don't worry, just make the outlet of height constraint.

Check below image , how to crete outlet of constrain,

Note :- You need to create out let of Height Constrain.

From your image.

And now set in your viewDidLayoutSubviews

-(void)viewDidLayoutSubviews
{
    NSInteger screenheight=[ [ UIScreen mainScreen ] bounds ].size.height;

    if (screenheight > 504 + 64)
    {
        _contentviewHeight.constant = screenheight-64;
    }

}

And last but not the least , Don't forget to remove Tick from Adjust Scrollview insects ,

Answer 2

In case of Autolayout, whatever view you are adding to scrollview. You have to add constraint (basically top constraint) so that Scrollview would calculate contentsize automatically.

refer below to add constraints programatically.

iOS create NSLayoutConstraint programmatically for table view cell content

Edit :-

Like you said SView is in storyboard. So create the constraint from storyboard itself on SView.

And E,R and H View will be added constraint programatically

And the link is just an example

You will use [self addConstraint] instead of [self.ContentView addConstraint]

Moreover refer this one too :-

iOS Autolayout Vertically equal space to fill parent view

Answer 3

OKAY, Finally.

After trying and retrying and to no avail. I just gave up on putting auto layout on the ViewController which have the scroll view itself.

So I untick the auto layout, and then VOILA.

Apparently, the view controller which have the scroll view don't need autolayout. Just the views that i put in via code need auto layout in their storyboard. After i adjust all the constraints in the view properly and never giving them aspect ratio constraints but just fixed their width and height. Done.

So I hope anybody who have the same frustration as me see this and heed my advice. Don't bother putting auto layout on the scroll view or its content View. Just Untick it altogether. Do the autolayout for the views you want to put in. You just have to specify the views' width and height properly and it will work.