Support for UILayoutSupports (topLayoutGuide & bottomLayoutGuide)

[raylillywhite]

Support for building constraints with topLayoutGuide and bottomLayoutGuide would be great. From what I understand, using the length property of the guide to build the constraint would require us to also monitor for status bar frame changes, and reconfigure our constraints.

This looks like it would be difficult to support without a big refactor, but if you have ideas for how you'd like this implemented, I'd be happy to work on it.

[cloudkite]

It was on the todo list, thanks for reminding me! I'll have a think and come back with some suggestions. In meantime I need to fix the tests as they no longer run due to the travis upgrade.

[cloudkite]

So I started looking into this and surprisingly it already works without any changes!
As topLayoutGuide and bottomLayoutGuides are UIView subclasses. However I might make some changes to Masonry in order to support layout guide in a cleaner way.

If you look at the latest examples project it now has a example for using top and bottom layout guides

[raylillywhite]

Oh, awesome. Nice find! Even with the casting, that's much cleaner than having to step outside masonry to create the constraint :)

In case someone finds this issue via search, here's the relevant part of the example:

[topView makeConstraints:^(MASConstraintMaker *make) {
    UIView *topLayoutGuide = (id)self.topLayoutGuide;
    make.top.equalTo(topLayoutGuide.bottom);
    make.left.equalTo(self.view);
    make.right.equalTo(self.view);
    make.height.equalTo(@40);
}];

Thanks @cloudkite! Feel free to close this issue. (I'm just leaving it open in case you wanted to track any additional changes you might make)

[huyz]

That topLayoutGuide.bottom should be topLayoutGuide.mas_bottom, right? The example doesn't look updated.

[cloudkite]

@huyz If you add #define MAS_SHORTHAND before importing Masonry.h then you can use the shorthand expressions ie view.bottom instead of view.mas_bottom

[lluisgerard]

Just in case, if someone wants to do the same on Swift, just cast topLayoutGuide to AnyObject:

topView.makeConstraints({ (make: MASConstraintMaker!) -> Void in
    let topLayoutGuide : AnyObject = self.topLayoutGuide
    make.top.equalTo()(topLayoutGuide.mas_bottom)
...

[dlahyani]

With iOS9 they replaced the layout guides from _UILayoutGuide (internal class which is a subclass of UIView) to UILayoutGuide which is not a UIView anymore. Do you guys intend to support the new layout guides in the Masonry?

I opened an issue for that: Issue #207 .

[hjue]

The length of topLayoutGuide is difference between viewDidLoad and viewWillAppear