iOS 适配iPhone X的方法

因为iPhone X奇特的刘海存在，iOS11之后系统深化了“安全区域”概念，安全区域就是从屏幕上切除最大的矩形之外的区域。

iOS11后UIScrollView新增contentInsetAdjustmentBehavior属性，默认配置UIScrollViewContentInsetAdjustmentAutomatic，效果上就是没使用安全区域。若针对具体页面需要使用安全区域，可以查看API中新增加的那些属性。

/**
 * 适配iPhone X的安全区域
 * isUse = 1 表示使用安全区域
 * isUse = 0 表示不使用安全区域
 */
+ (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)); 

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