[iOS]适配iPhone X

[iOS]适配iPhone X

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));