From 1f3d83784cac857899cce09c759b19ef180268d4 Mon Sep 17 00:00:00 2001
From: zhongwuzw <zhongwuzw@qq.com>
Date: Fri, 24 Aug 2018 16:03:50 +0800
Subject: [PATCH] Fix resource key invalid when clean cached disk file

---
 SDWebImage/SDDiskCache.m | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/SDWebImage/SDDiskCache.m b/SDWebImage/SDDiskCache.m
index 539cd68b..bac439f7 100644
--- a/SDWebImage/SDDiskCache.m
+++ b/SDWebImage/SDDiskCache.m
@@ -177,10 +177,10 @@
         // Target half of our maximum cache size for this cleanup pass.
         const NSUInteger desiredCacheSize = maxCacheSize / 2;
         
-        // Sort the remaining cache files by their last modification time (oldest first).
+        // Sort the remaining cache files by their last modification time or last access time (oldest first).
         NSArray<NSURL *> *sortedFiles = [cacheFiles keysSortedByValueWithOptions:NSSortConcurrent
                                                                  usingComparator:^NSComparisonResult(id obj1, id obj2) {
-                                                                     return [obj1[NSURLContentModificationDateKey] compare:obj2[NSURLContentModificationDateKey]];
+                                                                     return [obj1[cacheContentDateKey] compare:obj2[cacheContentDateKey]];
                                                                  }];
         
         // Delete files until we fall below our desired cache size.