1

keyBoard/Class/Pay/VC/KBVipPay.m

@@ -20,6 +20,9 @@ static NSString * const kKBVipReviewListCellId = @"kKBVipReviewListCellId";
 @property (nonatomic, assign) NSInteger selectedIndex;            // 当前选中的方案索引
 @property (nonatomic, strong) UIButton *closeButton;            // 当前选中的方案索引
 @property (nonatomic, strong) UIImageView *bgImageView;  // 全屏背景图
+// Header 自适应测量
+@property (nonatomic, strong) KBVipPayHeaderView *sizingHeader;
+@property (nonatomic, assign) CGFloat headerHeight;
 
 @end
 
@@ -60,6 +63,8 @@ static NSString * const kKBVipReviewListCellId = @"kKBVipReviewListCellId";
         make.width.height.mas_equalTo(36);
     }];
     
+    // 预计算 Header 高度（由内部约束决定）
+    self.headerHeight = [self kb_calcHeaderHeightForWidth:KB_SCREEN_WIDTH];
     [self.collectionView reloadData];
 }
 
@@ -75,6 +80,22 @@ static NSString * const kKBVipReviewListCellId = @"kKBVipReviewListCellId";
     if (cell) { [cell applySelected:YES animated:NO]; }
 }
 
+#pragma mark - Header Height Calc
+- (CGFloat)kb_calcHeaderHeightForWidth:(CGFloat)width {
+    if (width <= 0) { width = KB_SCREEN_WIDTH; }
+    if (!self.sizingHeader) {
+        self.sizingHeader = [[KBVipPayHeaderView alloc] initWithFrame:CGRectMake(0, 0, width, 1)];
+    }
+    // 更新目标宽度并触发布局
+    self.sizingHeader.bounds = CGRectMake(0, 0, width, self.sizingHeader.bounds.size.height);
+    [self.sizingHeader setNeedsLayout];
+    [self.sizingHeader layoutIfNeeded];
+    CGSize size = [self.sizingHeader systemLayoutSizeFittingSize:CGSizeMake(width, UILayoutFittingCompressedSize.height)
+                                  withHorizontalFittingPriority:UILayoutPriorityRequired
+                                        verticalFittingPriority:UILayoutPriorityFittingSizeLevel];
+    return MAX(1, ceil(size.height));
+}
+
 #pragma mark - Action
 - (void)onTapClose{
     [self.navigationController popViewControllerAnimated:true];
@@ -154,8 +175,10 @@ static NSString * const kKBVipReviewListCellId = @"kKBVipReviewListCellId";
 
 - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section {
     if (section == 0) {
-        // 头部高度 = 484 + 导航栏高度
-        return CGSizeMake(KB_SCREEN_WIDTH, 474 + KB_NAV_TOTAL_HEIGHT);
+        // 动态返回测量好的 Header 高度
+        CGFloat w = collectionView.bounds.size.width ?: KB_SCREEN_WIDTH;
+        if (self.headerHeight <= 1) { self.headerHeight = [self kb_calcHeaderHeightForWidth:w]; }
+        return CGSizeMake(w, self.headerHeight);
     }
     return CGSizeZero;
 }
@@ -180,6 +203,8 @@ static NSString * const kKBVipReviewListCellId = @"kKBVipReviewListCellId";
     if (!_collectionView) {
         UICollectionViewFlowLayout *layout = [UICollectionViewFlowLayout new];
         layout.scrollDirection = UICollectionViewScrollDirectionVertical;
+        // 每次宽度变化时让布局失效，便于 header 重算高度
+        layout.sectionHeadersPinToVisibleBounds = NO;
         _collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
         _collectionView.backgroundColor = [UIColor clearColor];
         _collectionView.dataSource = self;
@@ -204,4 +229,16 @@ static NSString * const kKBVipReviewListCellId = @"kKBVipReviewListCellId";
     }
     return _closeButton;
 }
+
+- (void)viewDidLayoutSubviews {
+    [super viewDidLayoutSubviews];
+    // 宽度变化时重算 Header 高度并刷新布局
+    CGFloat w = self.collectionView.bounds.size.width ?: KB_SCREEN_WIDTH;
+    CGFloat newH = [self kb_calcHeaderHeightForWidth:w];
+    if (fabs(newH - self.headerHeight) > 0.5) {
+        self.headerHeight = newH;
+        UICollectionViewFlowLayout *layout = (UICollectionViewFlowLayout *)self.collectionView.collectionViewLayout;
+        [layout invalidateLayout];
+    }
+}
 @end