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fix(ios): default contentInsetAdjustmentBehavior to scrollableAxes on iOS 26+ #57300

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fix(ios): default contentInsetAdjustmentBehavior to scrollableAxes on iOS 26+ #57300

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14 changes: 10 additions & 4 deletions ...ges/react-native/React/Fabric/Mounting/ComponentViews/ScrollView/RCTEnhancedScrollView.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -31,10 +31,16 @@ + (BOOL)automaticallyNotifiesObserversForKey:(NSString *)key
- (instancetype)initWithFrame:(CGRect)frame
{
if (self = [super initWithFrame:frame]) {
// We set the default behavior to "never" so that iOS
// doesn't do weird things to UIScrollView insets automatically
// and keeps it as an opt-in behavior.
self.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
if (@available(iOS 26, *)) {
NSNumber *compat = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"UIDesignRequiresCompatibility"];
if (!compat.boolValue) {
self.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentScrollableAxes;
} else {
self.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
}
} else {
self.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
}

// We intentionally force `UIScrollView`s `semanticContentAttribute` to `LTR` here
// because this attribute affects a position of vertical scrollbar; we don't want this
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22 changes: 17 additions & 5 deletions ...eact-native/React/Fabric/Mounting/ComponentViews/ScrollView/RCTScrollViewComponentView.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -436,7 +436,13 @@ - (void)updateProps:(const Props::Shared &)props oldProps:(const Props::Shared &

if ((oldScrollViewProps.contentInsetAdjustmentBehavior != newScrollViewProps.contentInsetAdjustmentBehavior) ||
_shouldUpdateContentInsetAdjustmentBehavior) {
const auto contentInsetAdjustmentBehavior = newScrollViewProps.contentInsetAdjustmentBehavior;
auto contentInsetAdjustmentBehavior = newScrollViewProps.contentInsetAdjustmentBehavior;
if (@available(iOS 26, *)) {
NSNumber *compat = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"UIDesignRequiresCompatibility"];
if (!compat.boolValue && contentInsetAdjustmentBehavior == ContentInsetAdjustmentBehavior::Never) {

@fabriziocucci fabriziocucci Jun 22, 2026

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On iOS 26 without UIDesignRequiresCompatibility, this upgrades Never to ScrollableAxes whenever the value is Never. The prop arrives as Never both for the RN default and when a developer explicitly sets contentInsetAdjustmentBehavior="never", so this overrides an explicit "never" too.

The effect is that there is no per-view way to keep never on iOS 26 now, just the app-wide UIDesignRequiresCompatibility opt-out.

Is overriding an explicit "never" intended? If someone wants no inset adjustment on a specific scroll view on iOS 26, how would they express it? The prop does not seem to carry whether the value was explicit, so maybe there is no clean per-view fix. Wanted to check the intent.

contentInsetAdjustmentBehavior = ContentInsetAdjustmentBehavior::ScrollableAxes;
}
}
if (contentInsetAdjustmentBehavior == ContentInsetAdjustmentBehavior::Never) {
scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
} else if (contentInsetAdjustmentBehavior == ContentInsetAdjustmentBehavior::Automatic) {
Expand Down Expand Up @@ -698,10 +704,16 @@ - (void)prepareForRecycle
_contentSize = CGSizeZero;
// Reset contentInset to prevent stale insets leaking into recycled scroll views.
_scrollView.contentInset = UIEdgeInsetsZero;
// We set the default behavior to "never" so that iOS
// doesn't do weird things to UIScrollView insets automatically
// and keeps it as an opt-in behavior.
_scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
if (@available(iOS 26, *)) {
NSNumber *compat = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"UIDesignRequiresCompatibility"];
if (!compat.boolValue) {
_scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentScrollableAxes;
} else {
_scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
}
} else {
_scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
}
_shouldUpdateContentInsetAdjustmentBehavior = YES;
_isUserTriggeredScrolling = NO;
CGRect oldFrame = self.frame;
Expand Down
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