Problem with UIView in UIScrollView

[fab-jul]

Hi there

First of all, thanks for Masonry, it looks really awesome! Unfortunately though, I have the following problem: I created a UIScrollView inside the UIView of my UIViewController and added some constraints to keep the scroll view the size of the view:

self.scrollView = [[UIScrollView alloc] initWithFrame:CGRectZero];
_scrollView.backgroundColor = [UIColor redColor];
[self.view addSubview:_scrollView];

[_scrollView makeConstraints:^(MASConstraintMaker *make) {
    make.edges.equalTo(self.view);
}];

This seems to work, but then I added a UIView inside the scroll view and tried to make it stick to the top:

UIView *view = [[UIView alloc] initWithFrame:CGRectZero];
view.backgroundColor = [UIColor blueColor];
[_scrollView addSubview:view];

[view makeConstraints:^(MASConstraintMaker *make) {
    make.top.equalTo(@0);
    make.left.equalTo(@0);
    make.right.equalTo(@0);
    make.height.equalTo(@100);
}]; 

However, this second view never shows up! Any idea on what I'm doing wrong?

[fab-jul]

Ok got it! I had to replace

 make.right.equalTo(@0);

with

make.width.equalTo(_scrollView.width);

Not sure why though, I guess I'll have to look into Auto Layout some more

[cloudkite]

UIScrollView has a few quirks when used with Auto Layout. See https://developer.apple.com/library/ios/technotes/tn2154/_index.html

[frkd-dev]

I think this case should be noted in docs, since it's non obvious. I spent several hours to figure out what's wrong with scrollview...