/**  * 適配iPhone X的安全區域  * isUse = 1 表示使用安全區域  * isUse = 0 表示不使用安全區域  */ + (void)adaptationSafeAreaWith:(UIScrollView *)sv useArea:(NSInteger)isUse {   if ([[sv class] isSubclassOfClass:[UIWebView class]]) {     UIWebView *webView = (UIWebView *)sv;     for (UIView *aView in [webView subviews]) {       if ([aView isKindOfClass:[UIScrollView class]]) {         sv = (UIScrollView *)aView;         break;       }     }   } #ifdef __IPHONE_11_0   if ([sv respondsToSelector:@selector(setContentInsetAdjustmentBehavior:)]) {     if (isUse) {       if (@available(iOS 11.0, *)) {         sv.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;         if ([[sv class] isSubclassOfClass:[UITableView class]]) {           UITableView *tv = (UITableView *)sv;           [tv setInsetsContentViewsToSafeArea:NO];         }       } else {         // Fallback on earlier versions       }     } else {       if (@available(iOS 11.0, *)) {         sv.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentAlways;       } else {         // Fallback on earlier versions       }     }   } #endif } 

typedef NS_ENUM(NSInteger, UIScrollViewContentInsetAdjustmentBehavior) {   UIScrollViewContentInsetAdjustmentAutomatic,   // Similar to .scrollableAxes, but for backward compatibility will also adjust the top & bottom contentInset when the scroll view is owned by a view controller with automaticallyAdjustsScrollViewInsets = YES inside a navigation controller, regardless of whether the scroll view is scrollable   UIScrollViewContentInsetAdjustmentScrollableAxes, // Edges for scrollable axes are adjusted (i.e., contentSize.width/height > frame.size.width/height or alwaysBounceHorizontal/Vertical = YES)   UIScrollViewContentInsetAdjustmentNever,     // contentInset is not adjusted   UIScrollViewContentInsetAdjustmentAlways,     // contentInset is always adjusted by the scroll view's safeAreaInsets } API_AVAILABLE(ios(11.0),tvos(11.0));