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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