45 lines
1.3 KiB
Plaintext
45 lines
1.3 KiB
Plaintext
#import "RNSScrollViewFinder.h"
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@implementation RNSScrollViewFinder
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+ (UIScrollView *)findScrollViewInFirstDescendantChainFrom:(UIView *)view
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{
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UIView *currentView = view;
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while (currentView != nil) {
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if ([currentView isKindOfClass:UIScrollView.class]) {
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return static_cast<UIScrollView *>(currentView);
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} else if ([currentView.subviews count] > 0) {
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currentView = currentView.subviews[0];
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} else {
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break;
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}
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}
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return nil;
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}
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+ (nullable UIScrollView *)findContentScrollViewWithDelegatingToProvider:(nullable UIView *)view
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{
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UIView *currentView = view;
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while (currentView != nil) {
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if ([currentView isKindOfClass:UIScrollView.class]) {
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return static_cast<UIScrollView *>(currentView);
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} else if ([currentView respondsToSelector:@selector(findContentScrollView)]) {
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// When traversing the hierarchy, we don't check for conformance to protocol,
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// but whether the view responds to `RNSContentScrollViewProviding.findContentScrollView`.
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// This doesn't place locks and is faster.
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return [static_cast<id<RNSContentScrollViewProviding>>(currentView) findContentScrollView];
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} else if ([currentView.subviews count] > 0) {
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currentView = currentView.subviews[0];
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} else {
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break;
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}
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}
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return nil;
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}
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@end
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