Merge branch 'feature/navigation_listeners' into 'develop'

Feature/navigation listeners

See merge request BPHV_MIPS/mvm_core!86

MVMCore/MVMCore/PresentationHandling/MVMCoreNavigationHandler.h

@@ -14,7 +14,7 @@
 @class MVMCoreNavigationObject;
 @class MVMCoreLoadObject;
 
-@interface MVMCoreNavigationHandler : NSObject
+@interface MVMCoreNavigationHandler : NSObject <UINavigationControllerDelegate>
 
 // Returns the shared instance of this singleton
 + (nullable instancetype)sharedNavigationHandler;
@@ -25,6 +25,8 @@
 // reference to main navigation controller
 @property (nullable, weak, nonatomic) UINavigationController *navigationController;
 
+/// A list of possible delegates looking for information.
+@property (nonnull, strong, nonatomic) NSHashTable<MVMCorePresentationDelegateProtocol> *delegates;
 
 // Will navigate appropriately based on the load style
 - (void)navigateWithLoadObject:(nullable MVMCoreLoadObject *)loadObject viewController:(nonnull UIViewController *)viewController delegate:(nullable NSObject<MVMCorePresentationDelegateProtocol>*)delegate completionHandler:(nullable void (^)(void))completionBlock;
@@ -35,6 +37,14 @@
 // pops or dimisses as needed
 - (void)removeCurrentViewController;
 
+#pragma mark - Delegate Handling
+
+/// Adds a listener for navigation delegate functions
+- (void)addDelegate:(nonnull id <MVMCorePresentationDelegateProtocol>)delegate;
+
+/// Removes a listener for navigation delegate functions
+- (void)removeDelegate:(nullable id <MVMCorePresentationDelegateProtocol>)delegate;
+
 #pragma mark - Navigation Simple
 // Uses the default navigation controller in app delegate
 

MVMCore/MVMCore/PresentationHandling/MVMCoreNavigationHandler.m

@@ -47,10 +47,24 @@
         
         self.presentationQueue = [[NSOperationQueue alloc] init];
         self.presentationQueue.maxConcurrentOperationCount = 1;
+        
+        self.delegates = (NSHashTable <MVMCorePresentationDelegateProtocol>*)[NSHashTable weakObjectsHashTable];
     }
     return self;
 }
 
+#pragma mark - Delegate Handling
+
+- (void)addDelegate:(nonnull id <MVMCorePresentationDelegateProtocol>)delegate {
+    [self.delegates addObject:delegate];
+}
+
+- (void)removeDelegate:(nullable id <MVMCorePresentationDelegateProtocol>)delegate {
+    [self.delegates removeObject:delegate];
+}
+
+#pragma mark - Navigation Helpers
+
 - (void)navigateWithLoadObject:(nullable MVMCoreLoadObject *)loadObject viewController:(nonnull UIViewController *)viewController delegate:(nullable NSObject<MVMCorePresentationDelegateProtocol>*)delegate completionHandler:(nullable void (^)(void))completionBlock {
     
     BOOL shouldAnimate = !loadObject.requestParameters.shouldNotAnimatePush;

MVMCore/MVMCore/PresentationHandling/MVMCoreNavigationOperation.m

@@ -13,6 +13,7 @@
 #import "MVMCoreLoggingHandler.h"
 #import "MVMCoreLoadingOverlayHandler.h"
 #import "MVMCoreViewControllerAnimatedTransitioning.h"
+#import "MVMCoreNavigationHandler.h"
 
 @interface MVMCoreNavigationOperation ()
 
@@ -225,6 +226,8 @@
     [super markAsFinished];
 }
 
+#pragma mark - Delegate
+
 - (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
     if (self.navigationObject.stopLoadingOverlay) {
         [[MVMCoreLoadingOverlayHandler sharedLoadingOverlay] stopLoading:YES];
@@ -234,6 +237,11 @@
     if (self.delegate && [self.delegate respondsToSelector:@selector(navigationController:willDisplayViewController:)]) {
         [self.delegate navigationController:navigationController willDisplayViewController:viewController];
     }
+    for (NSObject<MVMCorePresentationDelegateProtocol> *delegate in [MVMCoreNavigationHandler sharedNavigationHandler].delegates.allObjects) {
+        if (delegate && [delegate respondsToSelector:@selector(navigationController:willDisplayViewController:)]) {
+            [delegate navigationController:navigationController willDisplayViewController:viewController];
+        }
+    }
 }
 
 - (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
@@ -241,8 +249,13 @@
     if (self.delegate && [self.delegate respondsToSelector:@selector(navigationController:displayedViewController:)]) {
         [self.delegate navigationController:navigationController displayedViewController:viewController];
     }
+    for (NSObject<MVMCorePresentationDelegateProtocol> *delegate in [MVMCoreNavigationHandler sharedNavigationHandler].delegates.allObjects) {
+        if (delegate && [delegate respondsToSelector:@selector(navigationController:displayedViewController:)]) {
+            [delegate navigationController:navigationController displayedViewController:viewController];
+        }
+    }
     [self markAsFinished];
-    // Notify that page has changed
+    // Legacy notify that page has changed
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
         [[NSNotificationCenter defaultCenter] postNotificationName:MVMCoreNotificationViewControllerChanged object:nil];
     });

MVMCore/MVMCore/PresentationHandling/MVMCorePresentAnimationOperation.m

@@ -7,6 +7,7 @@
 //
 
 #import "MVMCorePresentAnimationOperation.h"
+#import "MVMCoreNavigationHandler.h"
 
 @interface MVMCorePresentAnimationOperation ()
 
@@ -39,12 +40,22 @@
     if (self.delegate && [self.delegate respondsToSelector:@selector(viewController:willPresentViewController:)]) {
         [self.delegate viewController:self.presentingViewController willPresentViewController:self.presentedViewController];
     }
+    for (NSObject<MVMCorePresentationDelegateProtocol> *delegate in [MVMCoreNavigationHandler sharedNavigationHandler].delegates.allObjects) {
+        if (delegate && [delegate respondsToSelector:@selector(viewController:willPresentViewController:)]) {
+            [delegate viewController:self.presentingViewController willPresentViewController:self.presentedViewController];
+        }
+    }
     
     [self.presentingViewController presentViewController:self.presentedViewController animated:self.animate completion:^{
         
         if (self.delegate && [self.delegate respondsToSelector:@selector(viewController:didPresentViewController:)]) {
             [self.delegate viewController:self.presentingViewController didPresentViewController:self.presentedViewController];
         }
+        for (NSObject<MVMCorePresentationDelegateProtocol> *delegate in [MVMCoreNavigationHandler sharedNavigationHandler].delegates.allObjects) {
+            if (delegate && [delegate respondsToSelector:@selector(viewController:didPresentViewController:)]) {
+                [delegate viewController:self.presentingViewController didPresentViewController:self.presentedViewController];
+            }
+        }
         [self markAsFinished];
     }];
 }