fix(ios): custom grabber missing tap-to-cycle-detent behavior (#571)

* feat(ios): tap custom grabber to cycle detents

Closes #568

* chore: update changelog

* chore: fix changelog category

Author: lodev09

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### 🐛 Bug fixes
 
+- **iOS**: Fixed custom grabber missing tap-to-cycle-detent behavior. ([#571](https://github.com/lodev09/react-native-true-sheet/pull/571) by [@lodev09](https://github.com/lodev09))
 - **Android**: Fixed pull to refresh not working for short ScrollViews. ([#570](https://github.com/lodev09/react-native-true-sheet/pull/570) by [@lodev09](https://github.com/lodev09))
 
 ## 3.9.7

ios/TrueSheetViewController.mm

@@ -743,10 +743,33 @@ - (void)setupGrabber {
     [_grabberView applyConfiguration];
     _grabberView.hidden = !showGrabber;
 
+    __weak __typeof(self) weakSelf = self;
+    _grabberView.onTap = ^{
+      [weakSelf handleGrabberTap];
+    };
+
     [self.view bringSubviewToFront:_grabberView];
   } else {
     self.sheet.prefersGrabberVisible = showGrabber;
     _grabberView.hidden = YES;
+    _grabberView.onTap = nil;
+  }
+}
+
+- (void)handleGrabberTap {
+  NSInteger detentCount = _detents.count;
+  if (detentCount == 0) return;
+
+  NSInteger currentIndex = self.currentDetentIndex;
+  if (currentIndex < 0) return;
+
+  NSInteger nextIndex = (currentIndex + 1) % detentCount;
+  if (nextIndex == 0 && detentCount == 1 && self.dismissible) {
+    [self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
+  } else {
+    [self.sheet animateChanges:^{
+      [self resizeToDetentIndex:nextIndex];
+    }];
   }
 }
 

ios/core/TrueSheetGrabberView.h

@@ -34,6 +34,9 @@ NS_ASSUME_NONNULL_BEGIN
 /// Whether the grabber color adapts to the background (default: YES)
 @property (nonatomic, strong, nullable) NSNumber *adaptive;
 
+/// Called when the grabber is tapped
+@property (nonatomic, copy, nullable) void (^onTap)(void);
+
 /// Adds the grabber view to a parent view with proper constraints
 - (void)addToView:(UIView *)parentView;
 

ios/core/TrueSheetGrabberView.mm

@@ -51,9 +51,11 @@ - (BOOL)isAdaptive {
 #pragma mark - Setup
 
 - (void)setupView {
-  self.userInteractionEnabled = NO;
   self.clipsToBounds = YES;
 
+  UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap)];
+  [self addGestureRecognizer:tap];
+
   _vibrancyView = [[UIVisualEffectView alloc] initWithEffect:nil];
   _vibrancyView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
   [self addSubview:_vibrancyView];
@@ -64,6 +66,14 @@ - (void)setupView {
   [_vibrancyView.contentView addSubview:_fillView];
 }
 
+#pragma mark - Actions
+
+- (void)handleTap {
+  if (_onTap) {
+    _onTap();
+  }
+}
+
 #pragma mark - Public
 
 - (void)addToView:(UIView *)parentView {