添加功能组件

CustomKeyboard/View/KBFunctionView.m

@@ -13,7 +13,7 @@
 
 static NSString * const kKBFunctionTagCellId = @"KBFunctionTagCellId";
 
-@interface KBFunctionView () <UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>
+@interface KBFunctionView () <UICollectionViewDataSource, UICollectionViewDelegateFlowLayout, KBFunctionBarViewDelegate>
 // UI
 @property (nonatomic, strong) KBFunctionBarView *barViewInternal;
 @property (nonatomic, strong) KBFunctionPasteView *pasteViewInternal;
@@ -161,10 +161,24 @@ static NSString * const kKBFunctionTagCellId = @"KBFunctionTagCellId";
 - (KBFunctionBarView *)barViewInternal {
     if (!_barViewInternal) {
         _barViewInternal = [[KBFunctionBarView alloc] init];
+        _barViewInternal.delegate = self; // 顶部功能Bar事件下发到本View
     }
     return _barViewInternal;
 }
 
+#pragma mark - KBFunctionBarViewDelegate
+
+- (void)functionBarView:(KBFunctionBarView *)bar didTapLeftAtIndex:(NSInteger)index {
+    // 将事件继续透传给上层（如键盘控制器），用于切换界面或其它业务
+    if ([self.delegate respondsToSelector:@selector(functionView:didTapToolActionAtIndex:)]) {
+        [self.delegate functionView:self didTapToolActionAtIndex:index];
+    }
+}
+
+- (void)functionBarView:(KBFunctionBarView *)bar didTapRightAtIndex:(NSInteger)index {
+    // 右侧按钮点击，如收藏/宫格等，按需继续向外抛出（这里暂不定义单独协议方法，可在此内部处理或扩展）
+}
+
 - (KBFunctionPasteView *)pasteViewInternal {
     if (!_pasteViewInternal) {
         _pasteViewInternal = [[KBFunctionPasteView alloc] init];