3

CustomKeyboard/View/Function/KBFunctionTagListView.h

@@ -21,7 +21,9 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)setItems:(NSArray<NSString *> *)items;
 
+/// 在指定 index 上显示/隐藏加载指示（若 cell 不可见，内部会记录状态，待出现时应用）
+- (void)setLoading:(BOOL)loading atIndex:(NSInteger)index;
+
 @end
 
 NS_ASSUME_NONNULL_END
-

CustomKeyboard/View/Function/KBFunctionTagListView.m

@@ -10,6 +10,7 @@ static NSString * const kKBFunctionTagCellId2 = @"KBFunctionTagCellId2";
 @interface KBFunctionTagListView () <UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>
 @property (nonatomic, strong) UICollectionView *collectionViewInternal;
 @property (nonatomic, copy) NSArray<NSString *> *items;
+@property (nonatomic, strong) NSMutableSet<NSNumber *> *loadingIndexes; // 记录需要展示loading的index
 @end
 
 @implementation KBFunctionTagListView
@@ -31,6 +32,7 @@ static NSString * const kKBFunctionTagCellId2 = @"KBFunctionTagCellId2";
             [_collectionViewInternal.trailingAnchor constraintEqualToAnchor:self.trailingAnchor],
         ]];
         _items = @[];
+        _loadingIndexes = [NSMutableSet set];
     }
     return self;
 }
@@ -46,6 +48,8 @@ static NSString * const kKBFunctionTagCellId2 = @"KBFunctionTagCellId2";
 - (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
     KBFunctionTagCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kKBFunctionTagCellId2 forIndexPath:indexPath];
     cell.titleLabel.text = (indexPath.item < self.items.count) ? self.items[indexPath.item] : @"";
+    BOOL loading = [self.loadingIndexes containsObject:@(indexPath.item)];
+    [cell setLoading:loading];
     return cell;
 }
 
@@ -65,4 +69,15 @@ static NSString * const kKBFunctionTagCellId2 = @"KBFunctionTagCellId2";
     }
 }
 
+- (void)setLoading:(BOOL)loading atIndex:(NSInteger)index {
+    NSNumber *key = @(index);
+    if (loading) { [self.loadingIndexes addObject:key]; }
+    else { [self.loadingIndexes removeObject:key]; }
+    NSIndexPath *ip = [NSIndexPath indexPathForItem:index inSection:0];
+    if (ip && ip.item < [self.collectionViewInternal numberOfItemsInSection:0]) {
+        KBFunctionTagCell *cell = (KBFunctionTagCell *)[self.collectionViewInternal cellForItemAtIndexPath:ip];
+        if ([cell isKindOfClass:[KBFunctionTagCell class]]) { [cell setLoading:loading]; }
+    }
+}
+
 @end