From 7cf2c02ad78863d7f6f72c5710e647a7cbeafaac Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=A8=8B=E6=80=9D=E6=BA=90?= <chengsiyuan@social-touch.com>
Date: Fri, 17 Feb 2017 16:59:59 +0800
Subject: [PATCH] * add support custom CIContextFactory.use it fix crash in
 iOS8

---
 QRCode/CIImageExtension.swift | 8 +++++++-
 QRCode/QRCode.swift           | 2 ++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/QRCode/CIImageExtension.swift b/QRCode/CIImageExtension.swift
index f096069..537855a 100644
--- a/QRCode/CIImageExtension.swift
+++ b/QRCode/CIImageExtension.swift
@@ -18,7 +18,13 @@ internal extension CIImage {
     ///
     /// - returns: an non-interpolated UIImage
     internal func nonInterpolatedImage(withScale scale: Scale = Scale(dx: 1, dy: 1)) -> UIImage? {
-        guard let cgImage = CIContext(options: nil).createCGImage(self, from: self.extent) else { return nil }
+        var ciContext:CIContext?
+        if QRCode.CIContextFactory != nil {
+            ciContext = QRCode.CIContextFactory!()
+        }else{
+            ciContext = CIContext(options: nil)
+        }
+        guard let cgImage = ciContext?.createCGImage(self, from: self.extent) else { return nil }
         let size = CGSize(width: self.extent.size.width * scale.dx, height: self.extent.size.height * scale.dy)
         
         UIGraphicsBeginImageContextWithOptions(size, true, 0)
diff --git a/QRCode/QRCode.swift b/QRCode/QRCode.swift
index 826ee94..e7b6fdb 100644
--- a/QRCode/QRCode.swift
+++ b/QRCode/QRCode.swift
@@ -13,6 +13,8 @@ public typealias 🔳 = QRCode
 /// QRCode generator
 public struct QRCode {
     
+    public static var CIContextFactory:(()->CIContext)?
+    
     /**
     The level of error correction.