Merge pull request #6 from airbnb/dfed--ci-swift-4.0-and-4.2

Support both Swift 4.0 and Swift 4.2

Author: dfed

.travis.yml

@@ -1,11 +1,13 @@
 language: objective-c
 osx_image: xcode10
-xcode_project: AloeStackView.xcodeproj
-xcode_scheme: AloeStackView
-xcode_destination: platform=iOS Simulator,OS=9.0,name=iPhone 6s
+env:
+  - SWIFT_VERSION=4.0
+  - SWIFT_VERSION=4.2
+install:
+  - bundle install
+  - brew outdated carthage || brew upgrade carthage
 before_script:
-    - bundle install
-    - brew outdated carthage || brew upgrade carthage
+  - bundle exec pod lib lint --verbose --fail-fast
+  - carthage build --verbose --no-skip-current
 script:
-    - bundle exec pod lib lint --verbose --fail-fast
-    - carthage build --verbose --no-skip-current
+  - xcodebuild -project AloeStackView.xcodeproj -scheme AloeStackView -sdk iphonesimulator -destination "platform=iOS Simulator,OS=9.0,name=iPhone 6s" -configuration Debug -PBXBuildsContinueAfterErrors=0 SWIFT_VERSION=$SWIFT_VERSION build test

AloeStackView.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name     = 'AloeStackView'
-  s.version  = '1.0.0'
+  s.version  = '1.0.1'
   s.license  = 'Apache License, Version 2.0'
   s.summary  = 'A simple class for laying out a collection of views with a convenient API, while leveraging the power of Auto Layout.'
   s.homepage = 'https://github.com/airbnb/AloeStackView'

README.md

@@ -8,8 +8,6 @@ A simple class for laying out a collection of views with a convenient API, while
 [![Platform](https://img.shields.io/cocoapods/p/AloeStackView.svg)](https://cocoapods.org/pods/AloeStackView)
 [![Build status](https://travis-ci.com/airbnb/AloeStackView.svg?branch=master)](https://travis-ci.com/airbnb/AloeStackView)
 
-#### Supports Swift 4.2
-
 ## Introduction
 
 `AloeStackView` is a class that allows a collection of views to be laid out in a vertical list. In a broad sense, it is similar
@@ -72,7 +70,7 @@ increase to a minimum and makes code contributions and debugging painless.
 
 * Deployment target iOS 9.0+
 * Xcode 10.0+
-* Swift 4.2+
+* Swift 4.0+
 
 ## Example App
 

Sources/AloeStackView/Views/SeparatorView.swift

@@ -31,7 +31,11 @@ internal final class SeparatorView: UIView {
   // MARK: Internal
 
   internal override var intrinsicContentSize: CGSize {
+    #if swift(>=4.2)
     return CGSize(width: UIView.noIntrinsicMetric, height: height)
+    #else
+    return CGSize(width: UIViewNoIntrinsicMetric, height: height)
+    #endif
   }
 
   internal var color: UIColor {