Merge pull request #17 from andreyoshev/master

Hard support for old iOS versions

Author: subdan

Sources/XcodeExport/XcodeColorExporter.swift

@@ -87,12 +87,16 @@ final public class XcodeColorExporter {
                 if let darkComponents = colorPair.dark?.toRgbComponents() {
                     contents.append("""
                         static var \(colorPair.light.name): UIColor {
-                            UIColor { traitCollection -> UIColor in
-                                if traitCollection.userInterfaceStyle == .dark {
-                                    return UIColor(red: \(darkComponents.red), green: \(darkComponents.green), blue: \(darkComponents.blue), alpha: \(darkComponents.alpha))
-                                } else {
-                                    return UIColor(red: \(lightComponents.red), green: \(lightComponents.green), blue: \(lightComponents.blue), alpha: \(lightComponents.alpha))
+                            if #available(iOS 13.0, *) {
+                                UIColor { traitCollection -> UIColor in
+                                    if traitCollection.userInterfaceStyle == .dark {
+                                        return UIColor(red: \(darkComponents.red), green: \(darkComponents.green), blue: \(darkComponents.blue), alpha: \(darkComponents.alpha))
+                                    } else {
+                                        return UIColor(red: \(lightComponents.red), green: \(lightComponents.green), blue: \(lightComponents.blue), alpha: \(lightComponents.alpha))
+                                    }
                                 }
+                            } else {
+                                return UIColor(red: \(lightComponents.red), green: \(lightComponents.green), blue: \(lightComponents.blue), alpha: \(lightComponents.alpha))
                             }
                         }\n
                     """)

Tests/XcodeExportTests/XcodeColorExporterTests.swift

@@ -44,12 +44,16 @@ final class XcodeColorExporterTests: XCTestCase {
 
         extension UIColor {
             static var colorPair1: UIColor {
-                UIColor { traitCollection -> UIColor in
-                    if traitCollection.userInterfaceStyle == .dark {
-                        return UIColor(red: 0.000, green: 0.000, blue: 0.000, alpha: 1.000)
-                    } else {
-                        return UIColor(red: 1.000, green: 1.000, blue: 1.000, alpha: 1.000)
+                if #available(iOS 13.0, *) {
+                    UIColor { traitCollection -> UIColor in
+                        if traitCollection.userInterfaceStyle == .dark {
+                            return UIColor(red: 0.000, green: 0.000, blue: 0.000, alpha: 1.000)
+                        } else {
+                            return UIColor(red: 1.000, green: 1.000, blue: 1.000, alpha: 1.000)
+                        }
                     }
+                } else {
+                    return UIColor(red: 1.000, green: 1.000, blue: 1.000, alpha: 1.000)
                 }
             }
             static var colorPair2: UIColor {