Initial commit

Add SizeClasser that detects devices specific orientation and split
view size classes.
Add example
Add readme
Add podspec
Add license

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LICENSE

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+Copyright (C) 2017, Cem Olcay 
+
+Permission is hereby granted, free of charge, to any person obtaining a 
+copy of this software and associated documentation files (the "Software"), 
+to deal in the Software without restriction, including without limitation 
+the rights to use, copy, modify, merge, publish, distribute, sublicense, 
+and/or sell copies of the Software, and to permit persons to whom the 
+Software is furnished to do so, subject to the following conditions: 
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+The above copyright notice and this permission notice shall be included in 
+all copies or substantial portions of the Software. 
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+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL 
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
+DEALINGS IN THE SOFTWARE. 
+

README.md

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+SizeClasser
+===
+
+Device specific `UITraitCollection` helper with split view detection for iOS.
+
+Demo
+----
+
+![alt tag](https://github.com/cemolcay/SizeClasser/blob/master/demo.gif?raw=true)
+
+Requirements
+----
+
+- Swift 3.0+
+- iOS 8.0+
+
+Install
+----
+
+```
+use_frameworks!
+pod 'SizeClasser'
+```
+
+Usage
+----
+
+[`SizeClasser`](https://github.com/cemolcay/SizeClasser/blob/master/SizeClasser/SizeClasser.swift) is an `OptionSet` type struct.  
+You can initilize it with your viewController's `traitCollection` property to identify your current device specific orientation and split view status.
+
+``` swift
+let sizeClasser = SizeClasser(traitCollection: traitCollection)
+```
+
+Options:
+
+``` swift
+/// Screen height is bigger than width. Portrait mode in all devices.
+public static let portrait = SizeClasser(rawValue: 1 << 0)
+/// Screen width is bigger than height. Landscape mode in all devices.
+public static let landscape = SizeClasser(rawValue: 1 << 1)
+/// Portrait mode for iPhone devices.
+public static let iPhonePortrait = SizeClasser(rawValue: 1 << 2)
+/// Landscape mode for iPhone devices.
+public static let iPhoneLandscape = SizeClasser(rawValue: 1 << 3)
+/// Portrait mode for iPad devices.
+public static let iPadPortrait = SizeClasser(rawValue: 1 << 4)
+/// Landscape mode for iPad devices.
+public static let iPadLandscape = SizeClasser(rawValue: 1 << 5)
+/// Split mode 1/3 of visible area in iPad devices.
+public static let iPadSplitOneThird = SizeClasser(rawValue: 1 << 8)
+/// Split mode 1/2 of visible area in iPad devices.
+public static let iPadSplitHalf = SizeClasser(rawValue: 1 << 9)
+/// Split mode 2/3 of visible area in iPad devices.
+public static let iPadSplitTwoThird = SizeClasser(rawValue: 1 << 10)
+```
+
+For example, if you want to detect iPad split view 1/3 on landscape orientation, simply:
+
+``` swift
+guard let trait = SizeClasser(traitCollection: traitCollection) else { return }
+if trait.contains([.iPadLandscape, .iPadSplitOneThird]) {
+  // You are on iPad, landscape and 1/3 split view mode
+  if SizeClasser.isiPadPro {
+    // You are on 12.9" iPad
+  } else {
+    // You are on regular iPad / iPad mini
+  }
+}
+```
+
+Also you can use `SizeClasser.isiPadPro` to detect 12.9" iPad Pro if you want to layout your views more specificly.  
+
+#### Note on `traitCollectionDidChange:previousTraitCollection` function:
+This function only get called if `traitCollection` changes.  
+If you are on iPad, either portrait or landscape mode, it won't change 1/3 split view to 2/3 split view transitions.  
+iOS calculates them both `compact width regular height` mode.  
+So, I recommend to use `viewDidLayoutSubviews:` function to detect split view changes specificly.  
+![alt tag](https://github.com/cemolcay/SizeClasser/blob/master/split.png?raw=true)