Post notifications for top view positions

- Removed performing selectors on child views. Notifications can happen asynchronously.

Author: Mike Enriquez + Leon Gersing

ECSlidingViewController/ThirdTopViewController.m

@@ -10,6 +10,32 @@
 
 @implementation ThirdTopViewController
 
+- (void)awakeFromNib
+{
+  [[NSNotificationCenter defaultCenter] addObserver:self 
+                                           selector:@selector(underLeftWillAppear:)
+                                               name:ECSlidingViewUnderLeftWillAppear 
+                                             object:self.slidingViewController];
+  [[NSNotificationCenter defaultCenter] addObserver:self
+                                           selector:@selector(topDidAnchorRight:) 
+                                               name:ECSlidingViewTopDidAnchorRight 
+                                             object:self.slidingViewController];
+  
+  [[NSNotificationCenter defaultCenter] addObserver:self
+                                           selector:@selector(underRightWillAppear:) 
+                                               name:ECSlidingViewUnderRightWillAppear 
+                                             object:self.slidingViewController];
+  [[NSNotificationCenter defaultCenter] addObserver:self
+                                           selector:@selector(topDidAnchorLeft:) 
+                                               name:ECSlidingViewTopDidAnchorLeft 
+                                             object:self.slidingViewController];
+  
+  [[NSNotificationCenter defaultCenter] addObserver:self
+                                           selector:@selector(topDidReset:) 
+                                               name:ECSlidingViewTopDidReset 
+                                             object:self.slidingViewController];
+}
+
 - (void)viewWillAppear:(BOOL)animated
 {
   [super viewWillAppear:animated];
@@ -30,18 +56,28 @@ - (IBAction)revealMenu:(id)sender
   [self.slidingViewController anchorTopViewTo:ECRight animations:nil onComplete:nil];
 }
 
-// callbacks from slidingViewController
-- (void)underLeftWillAppear
+// slidingViewController notification
+- (void)underLeftWillAppear:(NSNotification *)notification
 {
   NSLog(@"under left will appear");
 }
 
-- (void)underRightWillAppear
+- (void)topDidAnchorRight:(NSNotification *)notification
+{
+  NSLog(@"top did anchor right");
+}
+
+- (void)underRightWillAppear:(NSNotification *)notification
 {
   NSLog(@"under right will appear");
 }
 
-- (void)topDidReset
+- (void)topDidAnchorLeft:(NSNotification *)notification
+{
+  NSLog(@"top did anchor left");
+}
+
+- (void)topDidReset:(NSNotification *)notification
 {
   NSLog(@"top did reset");
 }

ECSlidingViewController/Vendor/ECSlidingViewController/ECSlidingViewController.h

@@ -9,6 +9,21 @@
 #import <UIKit/UIKit.h>
 #import "UIImage+ImageWithUIView.h"
 
+/** Notification that gets posted when the underRight view will appear */
+extern NSString *const ECSlidingViewUnderRightWillAppear;
+
+/** Notification that gets posted when the underLeft view will appear */
+extern NSString *const ECSlidingViewUnderLeftWillAppear;
+
+/** Notification that gets posted when the top view is anchored to the left side of the screen */
+extern NSString *const ECSlidingViewTopDidAnchorLeft;
+
+/** Notification that gets posted when the top view is anchored to the right side of the screen */
+extern NSString *const ECSlidingViewTopDidAnchorRight;
+
+/** Notification that gets posted when the top view is centered on the screen */
+extern NSString *const ECSlidingViewTopDidReset;
+
 /** @constant ECSide side of screen */
 typedef enum {
   /** Left side of screen */

ECSlidingViewController/Vendor/ECSlidingViewController/ECSlidingViewController.m

@@ -8,6 +8,12 @@
 
 #import "ECSlidingViewController.h"
 
+NSString *const ECSlidingViewUnderRightWillAppear = @"ECSlidingViewUnderRightWillAppear";
+NSString *const ECSlidingViewUnderLeftWillAppear  = @"ECSlidingViewUnderLeftWillAppear";
+NSString *const ECSlidingViewTopDidAnchorLeft     = @"ECSlidingViewTopDidAnchorLeft";
+NSString *const ECSlidingViewTopDidAnchorRight    = @"ECSlidingViewTopDidAnchorRight";
+NSString *const ECSlidingViewTopDidReset          = @"ECSlidingViewTopDidReset";
+
 @interface ECSlidingViewController()
 
 @property (nonatomic, strong) UIView *topViewSnapshot;
@@ -35,7 +41,6 @@ - (void)underLeftWillAppear;
 - (void)underRightWillAppear;
 - (void)topDidReset;
 - (BOOL)topViewHasFocus;
-- (void)performSelectorOnChildViewControllers:(SEL)selector;
 
 @end
 
@@ -222,6 +227,10 @@ - (void)anchorTopViewTo:(ECSide)side animations:(void (^)())animations onComplet
     }
 
     [self addTopViewSnapshot];
+    dispatch_async(dispatch_get_main_queue(), ^{
+      NSString *key = (side == ECLeft) ? ECSlidingViewTopDidAnchorLeft : ECSlidingViewTopDidAnchorRight;
+      [[NSNotificationCenter defaultCenter] postNotificationName:key object:self userInfo:nil];
+    });
   }];
 }
 
@@ -247,6 +256,10 @@ - (void)anchorTopViewOffScreenTo:(ECSide)side animations:(void(^)())animations o
       complete();
     }
     [self addTopViewSnapshot];
+    dispatch_async(dispatch_get_main_queue(), ^{
+      NSString *key = (side == ECLeft) ? ECSlidingViewTopDidAnchorLeft : ECSlidingViewTopDidAnchorRight;
+      [[NSNotificationCenter defaultCenter] postNotificationName:key object:self userInfo:nil];
+    });
   }];
 }
 
@@ -391,23 +404,29 @@ - (CGFloat)screenWidthForOrientation:(UIInterfaceOrientation)orientation
 
 - (void)underLeftWillAppear
 {
-  [self performSelectorOnChildViewControllers:@selector(underLeftWillAppear)];
+  dispatch_async(dispatch_get_main_queue(), ^{
+    [[NSNotificationCenter defaultCenter] postNotificationName:ECSlidingViewUnderLeftWillAppear object:self userInfo:nil];
+  });
   self.underRightView.hidden = YES;
   [self.underLeftViewController viewWillAppear:NO];
   self.underLeftView.hidden = NO;
 }
 
 - (void)underRightWillAppear
 {
-  [self performSelectorOnChildViewControllers:@selector(underRightWillAppear)];
+  dispatch_async(dispatch_get_main_queue(), ^{
+    [[NSNotificationCenter defaultCenter] postNotificationName:ECSlidingViewUnderRightWillAppear object:self userInfo:nil];
+  });
   self.underLeftView.hidden = YES;
   [self.underRightViewController viewWillAppear:NO];
   self.underRightView.hidden = NO;
 }
 
 - (void)topDidReset
 {
-  [self performSelectorOnChildViewControllers:@selector(topDidReset)];
+  dispatch_async(dispatch_get_main_queue(), ^{
+    [[NSNotificationCenter defaultCenter] postNotificationName:ECSlidingViewTopDidReset object:self userInfo:nil];
+  });
   [self.topView removeGestureRecognizer:self.resetTapGesture];
   [self removeTopViewSnapshot];
   self.panGesture.enabled = YES;
@@ -418,14 +437,4 @@ - (BOOL)topViewHasFocus
   return self.topView.center.x == self.resettedCenter;
 }
 
-- (void)performSelectorOnChildViewControllers:(SEL)selector
-{
-  NSArray *childViewControllers = [self childViewControllers];
-  for (UIViewController *childViewController in childViewControllers) {
-    if ([childViewController respondsToSelector:selector]) {
-      [childViewController performSelector:selector];
-    }
-  }
-}
-
 @end