Merge pull request #86 from tumblr/feature/add-back-notification-obse…

…rvation

Add back notification observation that was stupidly removed in 2.0.0

CHANGELOG.md

@@ -1,3 +1,9 @@
+### 2.1 -- 2015 May 8 ###
+
+Removes the need for the explicit memory warning and application background handling, which was an ill-advised change in 2.0.
+
+The other part of the 2.0 release still applies; you need to explicitly provide an object that knows how to vend background tasks in order for operations to continue after your application has been backgrounded.
+
 ### 2.0.0 -- 2015 April 27 ###
 
 2.0.0 removes all references to `UIApplication sharedApplication`. As of iOS 8, this method is annotated with `NS_EXTENSION_UNAVAILABLE_IOS`, meaning that it won’t compile as part of an iOS 8 extension. In order to facilitate `TMCache` usage inside extensions.

TMCache.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name          = 'TMCache'
-  s.version       = '2.0.0'
+  s.version       = '2.1.0'
   s.source_files  = 'TMCache/*.{h,m}'
   s.homepage      = 'https://github.com/tumblr/TMCache'
   s.summary       = 'Fast parallel object cache for iOS and OS X.'

TMCache/TMMemoryCache.h

@@ -297,8 +297,14 @@ typedef void (^TMMemoryCacheObjectBlock)(TMMemoryCache *cache, NSString *key, id
  */
 - (void)enumerateObjectsWithBlock:(TMMemoryCacheObjectBlock)block;
 
-- (void)handleMemoryWarning;
+/**
+ Handle a memory warning.
+ */
+- (void)handleMemoryWarning __deprecated_msg("This happens automatically in TMCache 2.1. There’s no longer a need to call it directly.");
 
-- (void)handleApplicationBackgrounding;
+/**
+ Handle the application having been backgrounded.
+ */
+- (void)handleApplicationBackgrounding __deprecated_msg("This happens automatically in TMCache 2.1. There’s no longer a need to call it directly.");
 
 @end

TMCache/TMMemoryCache.m

@@ -70,6 +70,18 @@ - (id)init
 
         _removeAllObjectsOnMemoryWarning = YES;
         _removeAllObjectsOnEnteringBackground = YES;
+
+#if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_4_0
+        [[NSNotificationCenter defaultCenter] addObserver:self
+                                                 selector:@selector(handleMemoryWarning)
+                                                     name:UIApplicationDidReceiveMemoryWarningNotification
+                                                   object:nil];
+
+        [[NSNotificationCenter defaultCenter] addObserver:self
+                                                 selector:@selector(handleApplicationBackgrounding)
+                                                     name:UIApplicationDidEnterBackgroundNotification
+                                                   object:nil];
+#endif
     }
     return self;
 }
@@ -88,9 +100,10 @@ + (instancetype)sharedCache
 
 #pragma mark - Private Methods -
 
-- (void)handleMemoryWarning {
-    #if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_4_0
-
+- (void)handleMemoryWarning
+{
+#if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_4_0
+
     if (self.removeAllObjectsOnMemoryWarning)
         [self removeAllObjects:nil];
 
@@ -105,11 +118,12 @@ - (void)handleMemoryWarning {
             strongSelf->_didReceiveMemoryWarningBlock(strongSelf);
     });
 
-    #endif
+#endif
 }
 
-- (void)handleApplicationBackgrounding {
-    #if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_4_0
+- (void)handleApplicationBackgrounding
+{
+#if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_4_0
 
     if (self.removeAllObjectsOnEnteringBackground)
         [self removeAllObjects:nil];
@@ -125,7 +139,7 @@ - (void)handleApplicationBackgrounding {
             strongSelf->_didEnterBackgroundBlock(strongSelf);
     });
 
-    #endif
+#endif
 }
 
 - (void)removeObjectAndExecuteBlocksForKey:(NSString *)key