now we can dynamic update allowsTouchEventsPassingThroughTransitionView api.

Author: HeathWang

HWPanModal.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'HWPanModal'
-  s.version          = '0.8.5'
+  s.version          = '0.8.6'
   s.summary          = 'HWPanModal is used to present controller and drag to dismiss.'
 
 # This description is used to generate tags and improve search results.

Sources/Controller/HWPanModalPresentationController.h

@@ -15,9 +15,12 @@ NS_ASSUME_NONNULL_BEGIN
 @interface HWPanModalPresentationController : UIPresentationController
 
 @property (nonatomic, readonly) HWDimmedView *backgroundView;
+@property (nonatomic, readonly) PresentationState currentPresentationState;
 
 - (void)setNeedsLayoutUpdate;
 
+- (void)updateUserHitBehavior;
+
 - (void)transitionToState:(PresentationState)state animated:(BOOL)animated;
 
 - (void)setScrollableContentOffset:(CGPoint)offset animated:(BOOL)animated;

Sources/Controller/HWPanModalPresentationController.m

@@ -194,6 +194,11 @@ - (void)setScrollableContentOffset:(CGPoint)offset animated:(BOOL)animated {
 	[self.handler setScrollableContentOffset:offset animated:animated];
 }
 
+- (void)updateUserHitBehavior {
+    [self checkVCContainerEventPass];
+    [self checkBackgroundViewEventPass];
+}
+
 #pragma mark - layout
 
 - (void)adjustPresentedViewFrame {
@@ -327,6 +332,29 @@ - (void)configureViewLayout {
     self.containerView.userInteractionEnabled = [[self presentable] isUserInteractionEnabled];
 }
 
+#pragma mark - event passing through
+
+- (void)checkVCContainerEventPass {
+    BOOL eventPassValue = [[self presentable] allowsTouchEventsPassingThroughTransitionView];
+    // hack TransitionView
+    [self.containerView setValue:@(eventPassValue) forKey:@"ignoreDirectTouchEvents"];
+}
+
+- (void)checkBackgroundViewEventPass {
+    if ([[self presentable] allowsTouchEventsPassingThroughTransitionView]) {
+        self.backgroundView.userInteractionEnabled = NO;
+        self.backgroundView.tapBlock = nil;
+    } else {
+        self.backgroundView.userInteractionEnabled = YES;
+        __weak typeof(self) wkSelf = self;
+        self.backgroundView.tapBlock = ^(UITapGestureRecognizer *recognizer) {
+            if ([[wkSelf presentable] allowsTapBackgroundToDismiss]) {
+                [wkSelf dismiss:NO mode:PanModalInteractiveModeNone];
+            }
+        };
+    }
+}
+
 #pragma mark - y position update
 
 - (void)snapToYPos:(CGFloat)yPos animated:(BOOL)animated {

Sources/Presentable/HWPanModalPresentable.h

@@ -199,14 +199,10 @@ typedef NS_ENUM(NSInteger, PresentingViewControllerAnimationStyle) {
 
 /**
  * 是否允许触摸事件透传到presenting ViewController/View。如果你有特殊需求的话(比如弹出一个底部视图，但是你想操作弹出视图下面的view，即presenting VC/View)，可开启此功能
- * 注意开启此功能，拖拽指示器会默认隐藏，背景色alpha默认为0.
  *
  * Whether allows touch events passing through the transition container view.
  * In some situations, you present the bottom VC/View, and you want to operate the presenting VC/View(mapView, scrollView and etc), enable this func.
  *
- * Note: When allows, the background view alpha = 0, and the drag indicator will be hidden.
- * @return Default is NO.
- *
  * Note: You SHOULD MUST dismiss the presented VC in the right time.
  */
 - (BOOL)allowsTouchEventsPassingThroughTransitionView;

Sources/Presentable/HWPanModalPresentationUpdateProtocol.h

@@ -15,6 +15,8 @@
 @property (nonatomic, readonly) UIView *hw_rootContainerView;
 /// which view that your presented viewController's view has been added.
 @property (nonatomic, readonly) UIView *hw_contentView;
+/// current presentation State
+@property (nonatomic, readonly) PresentationState hw_presentationState;
 /**
  * force update pan modal State, short/long
  */
@@ -47,4 +49,9 @@
  */
 - (void)hw_panModalSetNeedsLayoutUpdate NS_SWIFT_NAME(panModalSetNeedsLayoutUpdate());
 
+/**
+ * 更新用户行为，比如事件穿透
+ */
+- (void)hw_panModalUpdateUserHitBehavior NS_SWIFT_NAME(panModalUpdateUserHitBehavior());
+
 @end

Sources/Presentable/UIViewController+PanModalDefault.m

@@ -56,10 +56,6 @@ - (UIViewAnimationOptions)transitionAnimationOptions {
 }
 
 - (CGFloat)backgroundAlpha {
-    // set the background alpha = 0 when allows touch events passing through
-    if ([self allowsTouchEventsPassingThroughTransitionView]) {
-        return 0;
-    }
 	return 0.7;
 }
 
@@ -72,13 +68,6 @@ - (nonnull UIColor *)backgroundBlurColor {
 }
 
 - (HWBackgroundConfig *)backgroundConfig {
-    // set the background alpha = 0 when allows touch events passing through
-    if ([self allowsTouchEventsPassingThroughTransitionView]) {
-        HWBackgroundConfig *config = [HWBackgroundConfig configWithBehavior:HWBackgroundBehaviorDefault];
-        config.backgroundAlpha = 0;
-        return config;
-    }
-    
     return [HWBackgroundConfig configWithBehavior:HWBackgroundBehaviorDefault];
 }
 

Sources/Presentable/UIViewController+Presentation.m

@@ -41,6 +41,11 @@ - (void)hw_panModalSetNeedsLayoutUpdate {
     [self.hw_presentedVC setNeedsLayoutUpdate];
 }
 
+- (void)hw_panModalUpdateUserHitBehavior {
+    if (!self.hw_presentedVC) return;
+    [self.hw_presentedVC updateUserHitBehavior];
+}
+
 - (HWDimmedView *)hw_dimmedView {
     return self.hw_presentedVC.backgroundView;
 }
@@ -53,4 +58,8 @@ - (UIView *)hw_contentView {
     return self.hw_presentedVC.presentedView;
 }
 
+- (PresentationState)hw_presentationState {
+    return self.hw_presentedVC.currentPresentationState;
+}
+
 @end

Sources/View/PanModal/HWPanModalContainerView.h

@@ -18,6 +18,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 @property (nonatomic, readonly) HWDimmedView *backgroundView;
 @property (readonly) HWPanContainerView *panContainerView;
+@property (nonatomic, readonly) PresentationState currentPresentationState;
 
 - (instancetype)initWithPresentingView:(UIView *)presentingView contentView:(HWPanModalContentView<HWPanModalPresentable> *)contentView;
 
@@ -27,6 +28,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)setNeedsLayoutUpdate;
 
+- (void)updateUserHitBehavior;
+
 - (void)transitionToState:(PresentationState)state animated:(BOOL)animated;
 
 - (void)setScrollableContentOffset:(CGPoint)offset animated:(BOOL)animated;

Sources/View/PanModal/HWPanModalContainerView.m

@@ -158,6 +158,11 @@ - (void)setNeedsLayoutUpdate {
     [self updateRoundedCorners];
 }
 
+- (void)updateUserHitBehavior {
+    [self checkBackgroundViewEventPass];
+    [self checkPanGestureRecognizer];
+}
+
 - (void)transitionToState:(PresentationState)state animated:(BOOL)animated {
 
     if (![self.presentable shouldTransitionToState:state]) return;
@@ -428,6 +433,31 @@ - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
     }
 }
 
+- (void)checkBackgroundViewEventPass {
+    if ([[self presentable] allowsTouchEventsPassingThroughTransitionView]) {
+        self.backgroundView.userInteractionEnabled = NO;
+        self.backgroundView.tapBlock = nil;
+    } else {
+        self.backgroundView.userInteractionEnabled = YES;
+        __weak typeof(self) wkSelf = self;
+        self.backgroundView.tapBlock = ^(UITapGestureRecognizer *recognizer) {
+            if ([[wkSelf presentable] allowsTapBackgroundToDismiss]) {
+                [wkSelf dismiss:NO mode:PanModalInteractiveModeNone];
+            }
+        };
+    }
+}
+
+- (void)checkPanGestureRecognizer {
+    if ([[self presentable] allowsTouchEventsPassingThroughTransitionView]) {
+        [self removeGestureRecognizer:self.handler.panGestureRecognizer];
+        [self.panContainerView addGestureRecognizer:self.handler.panGestureRecognizer];
+    } else {
+        [self.panContainerView removeGestureRecognizer:self.handler.panGestureRecognizer];
+        [self addGestureRecognizer:self.handler.panGestureRecognizer];
+    }
+}
+
 #pragma mark - getter
 
 - (id<HWPanModalPresentable>)presentable {

Sources/View/PanModal/HWPanModalContentView.m

@@ -44,6 +44,10 @@ - (void)hw_panModalSetNeedsLayoutUpdate {
     [self.containerView setNeedsLayoutUpdate];
 }
 
+- (void)hw_panModalUpdateUserHitBehavior {
+    [self.containerView updateUserHitBehavior];
+}
+
 - (void)hw_panModalTransitionTo:(PresentationState)state animated:(BOOL)animated {
     [self.containerView transitionToState:state animated:animated];
 }
@@ -64,6 +68,10 @@ - (UIView *)hw_contentView {
     return (UIView *)self.containerView.panContainerView;
 }
 
+- (PresentationState)hw_presentationState {
+    return self.containerView.currentPresentationState;
+}
+
 #pragma mark - HWPanModalPresentable
 
 - (UIScrollView *)panScrollable {
@@ -112,9 +120,6 @@ - (UIViewAnimationOptions)transitionAnimationOptions {
 }
 
 - (CGFloat)backgroundAlpha {
-    if ([self allowsTouchEventsPassingThroughTransitionView]) {
-        return 0;
-    }
     return 0.7;
 }