From 1d8bfa6064fe05f2435c5d7b2593f566c11be7c6 Mon Sep 17 00:00:00 2001
From: limbo-lab <xian.tuxoid@qq.com>
Date: Tue, 18 Feb 2014 15:30:14 +0800
Subject: [PATCH] added clearDiskOnCompletion

---
 SDWebImage/SDImageCache.h |  1 +
 SDWebImage/SDImageCache.m | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/SDWebImage/SDImageCache.h b/SDWebImage/SDImageCache.h
index 0eab5d61..84812ed0 100644
--- a/SDWebImage/SDImageCache.h
+++ b/SDWebImage/SDImageCache.h
@@ -142,6 +142,7 @@ typedef NS_ENUM(NSInteger, SDImageCacheType) {
  * Clear all disk cached images
  */
 - (void)clearDisk;
+- (void)clearDiskOnCompletion:(void (^)())completion;
 
 /**
  * Remove all expired cached image from disk
diff --git a/SDWebImage/SDImageCache.m b/SDWebImage/SDImageCache.m
index d1f44c59..57778cf5 100644
--- a/SDWebImage/SDImageCache.m
+++ b/SDWebImage/SDImageCache.m
@@ -336,12 +336,23 @@ BOOL ImageDataHasPNGPreffix(NSData *data) {
 }
 
 - (void)clearDisk {
+    [self clearDiskOnCompletion:nil];
+}
+
+- (void)clearDiskOnCompletion:(void (^)())completion
+{
     dispatch_async(self.ioQueue, ^{
         [[NSFileManager defaultManager] removeItemAtPath:self.diskCachePath error:nil];
         [[NSFileManager defaultManager] createDirectoryAtPath:self.diskCachePath
                                   withIntermediateDirectories:YES
                                                    attributes:nil
                                                         error:NULL];
+
+        if (completion) {
+            dispatch_main_sync_safe(^{
+                completion();
+            });
+        }
     });
 }