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Pods/MJRefresh/MJRefresh/UICollectionViewLayout+MJRefresh.m

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+//
+//  UICollectionViewLayout+MJRefresh.m
+//
+//  该类是用来解决 Footer 在底端加载完成后, 仍停留在原处的 bug.
+//  此问题出现在 iOS 14 及以下系统上.
+//  Reference: https://github.com/CoderMJLee/MJRefresh/issues/1552
+//
+//  Created by jiasong on 2021/11/15.
+//  Copyright © 2021 小码哥. All rights reserved.
+//
+
+#import "UICollectionViewLayout+MJRefresh.h"
+#import "MJRefreshConst.h"
+#import "MJRefreshFooter.h"
+#import "UIScrollView+MJRefresh.h"
+
+@implementation UICollectionViewLayout (MJRefresh)
+
++ (void)load {
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        MJRefreshExchangeImplementations(self.class, @selector(finalizeCollectionViewUpdates),
+                                         self.class, @selector(mj_finalizeCollectionViewUpdates));
+    });
+}
+
+- (void)mj_finalizeCollectionViewUpdates {
+    [self mj_finalizeCollectionViewUpdates];
+    
+    __kindof MJRefreshFooter *footer = self.collectionView.mj_footer;
+    CGSize newSize = self.collectionViewContentSize;
+    CGSize oldSize = self.collectionView.contentSize;
+    if (footer != nil && !CGSizeEqualToSize(newSize, oldSize)) {
+        NSDictionary *changed = @{
+            NSKeyValueChangeNewKey: [NSValue valueWithCGSize:newSize],
+            NSKeyValueChangeOldKey: [NSValue valueWithCGSize:oldSize],
+        };
+        [CATransaction begin];
+        [CATransaction setDisableActions:YES];
+        [footer scrollViewContentSizeDidChange:changed];
+        [CATransaction commit];
+    }
+}
+
+@end