Everyone wants to see a smooth scrolling, that tableview or collectionview scrolls without any lags and it's a right choice. But the constraints do not give it for us. Therefore, we have to choose manual calculation frames, but sometimes, when cell has a complex structure, code has not an elegant, beautiful structure.

So, it's library for those, who want to see smooth scrolling with elegant code under the hood!

Enjoy reading! 🎉

Framezilla is the child of Framer (analog of great layout framework which wraps manually calculation frames with a nice-chaining syntax), but only for Swift.

Installation 🔥

CocoaPods

CocoaPods is a dependency manager for Swift and Objective-C Cocoa projects. It has over eighteen thousand libraries and can help you scale your projects elegantly. You can install it with the following command:

$ sudo gem install cocoapods

To integrate Framezilla, simply add the following line to your Podfile:

pod "Framezilla"

Then, run the following command:

$ pod install

Carthage

Carthage is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks.

You can install Carthage with Homebrew using the following command:

$ brew update
$ brew install carthage

To integrate Framezilla into your Xcode project using Carthage, specify it in your Cartfile:

github "Otbivnoe/Framezilla"

Run carthage update to build the framework and drag the built Framezilla.framework into your Xcode project.

Features 💥

• Edges with superview
• Width / Height
• Top / Left / Bottom / Right
• CenterX / CenterY / Center (between views)
• SizeToFit / SizeThatFits / WidthToFit / HeightToFit
• Container
• Stack
• Optional semantic - and
• Side relations: nui_left, nui_bottom, nui_width, nui_centerX and so on.
• States
• Safe area support 😱

Usage 🚀

Size (width, height)

There're a few methods for working with view's size.

You can configure width and height separately:

  view.configureFrame { maker in
      maker.width(200).and.height(200)
  }

or together with the same result:

  view.configureFrame { maker in
      maker.size(width: 200, height: 200)
  }

For simplify configuration use << and >> operators:

  view<<.size(width: 200, height: 200)>>

Also in some cases you want to equate the sides of two views with some multiplier.

For example:

  view.configureFrame { maker in
      maker.width(to: view1.nui_height, multiplier: 0.5)
      maker.height(to: view1.nui_width) // x1 multiplier - default
  }

Edges

Framezilla has two method for comfortable creating edge-relation.

Either you can create edge relation so

  view.configureFrame { maker in
      maker.edges(insets: UIEdgeInsetsMake(5, 5, 5, 5))
  }

or

  view.configureFrame { maker in
      maker.edges(top: 5, left: 5, bottom: 5, right: 5)
  }

the second method has optional parameters, so maker.edges(top: 5, left: 5, bottom: 5) also works correct, but does not create right relation, that in some cases is very useful.

Side relations (Top, left, bottom, right)

You can create edge relation, as shown above, but only use side relations.

  view.configureFrame { maker in
      maker.top(inset: 5).and.bottom(inset: 5)
      maker.left(inset: 5).and.right(inset: 5)
  }

Also possible to create relations with another view, not a superview:

  // Red view
  view.configureFrame { maker in
      maker.size(width: 30, height: 30)
      maker.left(to: self.view1.nui_right, inset: 5)
      maker.bottom(to: self.view1.nui_centerY)
  }

In iOS 11 Apple has introduced the safe area, similar to topLayoutGuide and bottomLayoutGuide. Framezilla supports this new api as well:

content.configureFrame { maker in
    maker.top(to: nui_safeArea)
    maker.bottom(to: nui_safeArea)
    maker.right(to: nui_safeArea, inset: 10)
    maker.left(to: nui_safeArea, inset: 10)
}

Note: In earlier versions of OS than iOS 11, these methods create a relation to a superview, not the safe area.

Center relations

If you just want to center subview relative superview with constant width and height, this approach specially for you:

  view.configureFrame { maker in
      maker.centerY().and.centerX()
      maker.size(width: 100, height: 100)
  }

Also possible to set manually centerX and centerY. Just call setCenterX and setCenterY.

What if you want to join the center point of the view with the top right point of another view?

PFF, OKAY.

  view.configureFrame { maker in
      maker.centerX(to: self.view1.nui_right, offset: 0)
      maker.centerY(to: self.view1.nui_top) //Zero offset - default
      maker.size(width: 50, height: 50)
  }

SizeToFit and SizeThatFits

Very often you should configure labels, so there are some methods for comfortable work with them.

SizeToFit

  label.configureFrame { maker in
      maker.sizeToFit() // Configure width and height by text length no limits
      maker.centerX().and.centerY()
  }

SizeThatFits

But what if you have to specify edges for label?

  label.configureFrame { maker in
      maker.sizeThatFits(size: CGSize(width: 200, height: 100))
      maker.centerX().and.centerY()
  }

Container

Use this method when you want to set width and height by wrapping all subviews.

NOTE:

First, you should configure all subviews and then call this method for container view.

Also important to understand, that it's not correct to call 'left' and 'right' relations together by subview, because container sets width relatively width of subview and here is some ambiguous.

  label1.configureFrame { maker in
      maker.sizeToFit()
      maker.top()
      maker.left(inset: 5)
  }

  label2.configureFrame { maker in
      maker.sizeToFit()
      maker.top(to: label1.nui_bottom, inset: 5)
      maker.left(inset: 5)
  }

  view1.configureFrame { maker in
      maker.centerY().centerX()
      maker.container()
  }

Cool things:

Sometimes you want to configure a few views with the same size, for examlple. There is a convinience method:

  [view1, view2].configureFrames { maker in
      maker.size(width: 200, height: 100)
  }

Stack

Framezilla allows you configure views like stack behaviour. Important to point out correct views order.

  [view3, view2, view1].stack(axis: .horizontal, spacing: 3)

States

It's very convenient use many states for animations, because you can just configure all states in one place and when needed change frame for view - just apply needed state! Awesome, is'n it?

override func viewDidLayoutSubviews() {

    super.viewDidLayoutSubviews()

    // state `DEFAULT_STATE`
    view1.configureFrame { maker in
        maker.centerX().and.centerY()
        maker.width(50).and.height(50)
    }

    view1.configureFrame(state: 1) { maker in
        maker.centerX().and.centerY()
        maker.width(100).and.height(100)
    }
}

set new state and animate it:

/* Next time when viewDidLayoutSubviews will be called, `view1` will configure frame for state 1. */
  view1.nx_state = 1 // Any hashable value
  view.setNeedsLayout()
  UIView.animate(withDuration: 1.0) {
      self.view.layoutIfNeeded()
  }

Also possible to apply many states in a row:

  view1.configureFrame(states: [3, "state"]) { maker in
      maker.size(width: 200, height: 100)
  }

Author 💪

Nikita Ermolenko, [email protected]

Thanks 👍

Thanks Artem Novichkov for the name of the library!

Thanks Evgeny Mikhaylov for 'state' feature!

Thanks Anton Kovalev for improving library!

Contribute 🙏

I would love you to contribute to Framezilla, check the CONTRIBUTING file for more info.

License ❗️

Framezilla is available under the MIT license. See the LICENSE file for more info.