From e9fcbc43cdecb1fd16c43d89b96f50155796aedf Mon Sep 17 00:00:00 2001
From: luomy <ozonelmy@163.com>
Date: Thu, 5 Jan 2023 15:53:58 +0800
Subject: [PATCH] feat(ios): add method to create custom scrollview (#2839)

---
 .../component/scrollview/HippyScrollView.h    | 14 ++++++++++-
 .../component/scrollview/HippyScrollView.m    | 23 +++++++++++--------
 2 files changed, 26 insertions(+), 11 deletions(-)

diff --git a/ios/sdk/component/scrollview/HippyScrollView.h b/ios/sdk/component/scrollview/HippyScrollView.h
index b841fb01c5e..faf9ffecabb 100644
--- a/ios/sdk/component/scrollview/HippyScrollView.h
+++ b/ios/sdk/component/scrollview/HippyScrollView.h
@@ -29,10 +29,22 @@
 
 @protocol UIScrollViewDelegate;
 
+@interface HippyCustomScrollView : UIScrollView <UIGestureRecognizerDelegate>
+
+@property (nonatomic, assign) BOOL centerContent;
+
+@end
+
 @interface HippyScrollView : HippyView <UIScrollViewDelegate, HippyScrollableProtocol, HippyAutoInsetsProtocol, HippyInvalidating>
 
 - (instancetype)initWithEventDispatcher:(HippyEventDispatcher *)eventDispatcher NS_DESIGNATED_INITIALIZER;
 
+/**
+ * This is where subclasses should create their custom scroll view hierarchy if they dont want to use default scroll view.
+ * Should never be called directly.
+ */
+- (HippyCustomScrollView *)loadScrollView;
+
 /**
  * The `HippyScrollView` may have at most one single subview. This will ensure
  * that the scroll view's `contentSize` will be efficiently set to the size of
@@ -49,7 +61,7 @@
 @property (nonatomic, assign) CGSize contentSize;
 
 /**
- * The underlying scrollView (TODO: can we remove this?)
+ * Get the underlying scrollview.
  */
 @property (nonatomic, readonly) UIScrollView *scrollView;
 
diff --git a/ios/sdk/component/scrollview/HippyScrollView.m b/ios/sdk/component/scrollview/HippyScrollView.m
index 0770a9ae7b8..aff1cb9678a 100644
--- a/ios/sdk/component/scrollview/HippyScrollView.m
+++ b/ios/sdk/component/scrollview/HippyScrollView.m
@@ -33,12 +33,6 @@
 #import "HippyI18nUtils.h"
 #import "objc/runtime.h"
 
-@interface HippyCustomScrollView : UIScrollView <UIGestureRecognizerDelegate>
-
-@property (nonatomic, assign) BOOL centerContent;
-
-@end
-
 @implementation HippyCustomScrollView
 
 - (instancetype)initWithFrame:(CGRect)frame {
@@ -168,7 +162,7 @@ - (void)setContentOffset:(CGPoint)contentOffset {
 
 @end
 
-@implementation HippyScrollView {
+@interface HippyScrollView() {
     HippyCustomScrollView *_scrollView;
     UIView *_contentView;
     NSTimeInterval _lastScrollDispatchTime;
@@ -184,13 +178,14 @@ @implementation HippyScrollView {
     __weak HippyRootView *_rootView;
 }
 
+@end
+
+@implementation HippyScrollView
+
 - (instancetype)initWithEventDispatcher:(HippyEventDispatcher *)eventDispatcher {
     HippyAssertParam(eventDispatcher);
 
     if ((self = [super initWithFrame:CGRectZero])) {
-        _scrollView = [[HippyCustomScrollView alloc] initWithFrame:CGRectZero];
-        _scrollView.delegate = self;
-        _scrollView.delaysContentTouches = NO;
         _automaticallyAdjustContentInsets = YES;
         _contentInset = UIEdgeInsetsZero;
         _contentSize = CGSizeZero;
@@ -202,6 +197,7 @@ - (instancetype)initWithEventDispatcher:(HippyEventDispatcher *)eventDispatcher
         _scrollListeners = [NSHashTable weakObjectsHashTable];
         _contentOffsetCache = [NSMutableDictionary dictionaryWithCapacity:32];
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveMemoryWarning) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
+        _scrollView = [self loadScrollView];
         [self addSubview:_scrollView];
         if ([self needsLayoutForRTL]) {
             _scrollView.transform = CGAffineTransformMakeRotation(M_PI);
@@ -210,6 +206,13 @@ - (instancetype)initWithEventDispatcher:(HippyEventDispatcher *)eventDispatcher
     return self;
 }
 
+- (HippyCustomScrollView *)loadScrollView {
+    HippyCustomScrollView *scrollview = [[HippyCustomScrollView alloc] initWithFrame:CGRectZero];
+    scrollview.delegate = self;
+    scrollview.delaysContentTouches = NO;
+    return scrollview;
+}
+
 - (void)didReceiveMemoryWarning {
     [_contentOffsetCache removeAllObjects];
 }