diff --git a/RATreeView.podspec.json b/RATreeView.podspec.json
index 7883013..2193988 100644
--- a/RATreeView.podspec.json
+++ b/RATreeView.podspec.json
@@ -16,7 +16,7 @@
     "tag": "v2.1.5"
   },
   "platforms": {
-    "ios": "7.0",
+    "ios": "11.0",
     "tvos": "9.0"
   },
   "source_files": "RATreeView/RATreeView/**/*.{h,m}",
diff --git a/RATreeView/RATreeView/Private Files/RABatchChangeEntity.h b/RATreeView/RATreeView/Private Files/RABatchChangeEntity.h
index 41b4601..eacc8b8 100644
--- a/RATreeView/RATreeView/Private Files/RABatchChangeEntity.h	
+++ b/RATreeView/RATreeView/Private Files/RABatchChangeEntity.h	
@@ -23,9 +23,9 @@ typedef NS_ENUM(NSInteger, RABatchChangeType) {
 
 @property (nonatomic) RABatchChangeType type;
 @property (nonatomic) NSInteger ranking;
-@property (nonatomic, copy) void(^updatesBlock)();
+@property (nonatomic, copy) void(^updatesBlock)(void);
 
-+ (instancetype)batchChangeEntityWithBlock:(void(^)())updates type:(RABatchChangeType)type ranking:(NSInteger)ranking;
++ (instancetype)batchChangeEntityWithBlock:(void(^)(void))updates type:(RABatchChangeType)type ranking:(NSInteger)ranking;
 
 @end
 
diff --git a/RATreeView/RATreeView/Private Files/RABatchChangeEntity.m b/RATreeView/RATreeView/Private Files/RABatchChangeEntity.m
index 96c6228..d5fbc48 100644
--- a/RATreeView/RATreeView/Private Files/RABatchChangeEntity.m	
+++ b/RATreeView/RATreeView/Private Files/RABatchChangeEntity.m	
@@ -12,7 +12,7 @@
 
 @implementation RABatchChangeEntity
 
-+ (instancetype)batchChangeEntityWithBlock:(void (^)())updates type:(RABatchChangeType)type ranking:(NSInteger)ranking
++ (instancetype)batchChangeEntityWithBlock:(void (^)(void))updates type:(RABatchChangeType)type ranking:(NSInteger)ranking
 {
     NSParameterAssert(updates);
     RABatchChangeEntity *entity = [RABatchChangeEntity new];
diff --git a/RATreeView/RATreeView/Private Files/RABatchChanges.h b/RATreeView/RATreeView/Private Files/RABatchChanges.h
index 495674b..ea42d9f 100644
--- a/RATreeView/RATreeView/Private Files/RABatchChanges.h	
+++ b/RATreeView/RATreeView/Private Files/RABatchChanges.h	
@@ -26,12 +26,12 @@
 - (void)beginUpdates;
 - (void)endUpdates;
 
-- (void)expandItemWithBlock:(void(^)())update atIndex:(NSInteger)index;
-- (void)insertItemWithBlock:(void(^)())update atIndex:(NSInteger)index;
+- (void)expandItemWithBlock:(void(^)(void))update atIndex:(NSInteger)index;
+- (void)insertItemWithBlock:(void(^)(void))update atIndex:(NSInteger)index;
 
-- (void)collapseItemWithBlock:(void(^)())update lastIndex:(NSInteger)index;
-- (void)deleteItemWithBlock:(void(^)())update lastIndex:(NSInteger)index;
+- (void)collapseItemWithBlock:(void(^)(void))update lastIndex:(NSInteger)index;
+- (void)deleteItemWithBlock:(void(^)(void))update lastIndex:(NSInteger)index;
 
-- (void)moveItemWithDeletionBlock:(void (^)())deletionUpdate fromLastIndex:(NSInteger)lastIndex additionBlock:(void (^)())additionUpdate toIndex:(NSInteger)index;
+- (void)moveItemWithDeletionBlock:(void (^)(void))deletionUpdate fromLastIndex:(NSInteger)lastIndex additionBlock:(void (^)(void))additionUpdate toIndex:(NSInteger)index;
 
 @end
diff --git a/RATreeView/RATreeView/Private Files/RABatchChanges.m b/RATreeView/RATreeView/Private Files/RABatchChanges.m
index e2e88ad..09934ee 100644
--- a/RATreeView/RATreeView/Private Files/RABatchChanges.m	
+++ b/RATreeView/RATreeView/Private Files/RABatchChanges.m	
@@ -63,7 +63,7 @@ - (void)endUpdates
   }
 }
 
-- (void)insertItemWithBlock:(void (^)())update atIndex:(NSInteger)index
+- (void)insertItemWithBlock:(void (^)(void))update atIndex:(NSInteger)index
 {
   RABatchChangeEntity *entity = [RABatchChangeEntity batchChangeEntityWithBlock:update
                                                                            type:RABatchChangeTypeItemRowInsertion
@@ -71,7 +71,7 @@ - (void)insertItemWithBlock:(void (^)())update atIndex:(NSInteger)index
   [self addBatchChangeEntity:entity];
 }
 
-- (void)expandItemWithBlock:(void (^)())update atIndex:(NSInteger)index
+- (void)expandItemWithBlock:(void (^)(void))update atIndex:(NSInteger)index
 {
   RABatchChangeEntity *entity= [RABatchChangeEntity batchChangeEntityWithBlock:update
                                                                           type:RABatchChangeTypeItemRowExpansion
@@ -79,7 +79,7 @@ - (void)expandItemWithBlock:(void (^)())update atIndex:(NSInteger)index
   [self addBatchChangeEntity:entity];
 }
 
-- (void)deleteItemWithBlock:(void (^)())update lastIndex:(NSInteger)lastIndex
+- (void)deleteItemWithBlock:(void (^)(void))update lastIndex:(NSInteger)lastIndex
 {
   RABatchChangeEntity *entity = [RABatchChangeEntity batchChangeEntityWithBlock:update
                                                                            type:RABatchChangeTypeItemRowDeletion
@@ -87,7 +87,7 @@ - (void)deleteItemWithBlock:(void (^)())update lastIndex:(NSInteger)lastIndex
   [self addBatchChangeEntity:entity];
 }
 
-- (void)collapseItemWithBlock:(void (^)())update lastIndex:(NSInteger)lastIndex
+- (void)collapseItemWithBlock:(void (^)(void))update lastIndex:(NSInteger)lastIndex
 {
   RABatchChangeEntity *entity = [RABatchChangeEntity batchChangeEntityWithBlock:update
                                                                            type:RABatchChangeTypeItemRowCollapse
@@ -95,7 +95,7 @@ - (void)collapseItemWithBlock:(void (^)())update lastIndex:(NSInteger)lastIndex
   [self addBatchChangeEntity:entity];
 }
 
-- (void)moveItemWithDeletionBlock:(void (^)())deletionUpdate fromLastIndex:(NSInteger)lastIndex additionBlock:(void (^)())additionUpdate toIndex:(NSInteger)index
+- (void)moveItemWithDeletionBlock:(void (^)(void))deletionUpdate fromLastIndex:(NSInteger)lastIndex additionBlock:(void (^)(void))additionUpdate toIndex:(NSInteger)index
 {
   RABatchChangeEntity *firstEntity = [RABatchChangeEntity batchChangeEntityWithBlock:deletionUpdate
                                                                                 type:RABatchChangeTypeItemRowDeletion
diff --git a/RATreeView/RATreeView/Private Files/RATreeView+Enums.m b/RATreeView/RATreeView/Private Files/RATreeView+Enums.m
index 862e919..43d36ca 100644
--- a/RATreeView/RATreeView/Private Files/RATreeView+Enums.m	
+++ b/RATreeView/RATreeView/Private Files/RATreeView+Enums.m	
@@ -60,8 +60,6 @@ + (RATreeViewCellSeparatorStyle)treeViewCellSeparatorStyleForTableViewSeparatorS
       return RATreeViewCellSeparatorStyleNone;
     case UITableViewCellSeparatorStyleSingleLine:
       return RATreeViewCellSeparatorStyleSingleLine;
-    case UITableViewCellSeparatorStyleSingleLineEtched:
-      return RATreeViewCellSeparatorStyleSingleLineEtched;
     default:
       return RATreeViewCellSeparatorStyleNone;
   }
@@ -74,8 +72,6 @@ + (UITableViewCellSeparatorStyle)tableViewCellSeparatorStyleForTreeViewCellSepar
       return UITableViewCellSeparatorStyleNone;
     case RATreeViewCellSeparatorStyleSingleLine:
       return UITableViewCellSeparatorStyleSingleLine;
-    case RATreeViewCellSeparatorStyleSingleLineEtched:
-      return UITableViewCellSeparatorStyleSingleLineEtched;
     default:
       return UITableViewCellSeparatorStyleNone;
   }
diff --git a/RATreeView/RATreeView/RATreeView.h b/RATreeView/RATreeView/RATreeView.h
index 327e639..4ccefc3 100644
--- a/RATreeView/RATreeView/RATreeView.h
+++ b/RATreeView/RATreeView/RATreeView.h
@@ -65,7 +65,6 @@ typedef enum RATreeViewRowAnimation {
  *
  *  @param treeView     The tree-view that sent the message.
  *  @param item         An item identifying a cell in tree view.
- *  @param treeNodeInfo Object including additional information about item.
  *
  *  @return The number of child items encompassed by item. If item is nil, this method should return the number of children for the top-level item.
  */
@@ -105,7 +104,6 @@ typedef enum RATreeViewRowAnimation {
  *  @param treeView     The tree-view object requesting the insertion or deletion.
  *  @param editingStyle The cell editing style corresponding to a insertion or deletion requested for the row specified by item. Possible editing styles are `UITableViewCellEditingStyleInsert` or `UITableViewCellEditingStyleDelete`.
  *  @param item         An item identifying a cell in tree view.
- *  @param treeNodeInfo Object including additional information about item.
  */
 - (void)treeView:(RATreeView *)treeView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowForItem:(id)item;
 
@@ -413,7 +411,6 @@ typedef enum RATreeViewRowAnimation {
  *  Asks the delegate if the row for a specified item should be highlighted.
  *
  *  @param treeView     The tree-view object that is making this request.
- *  @param treeNodeInfo Object including additional information about item.
  *
  *  @return YES if the row should be highlighted or NO if it should not.
  */