原文
iOS刘海手机屏幕的适配
判断是不是iphone x齐刘海屏幕
iOS开发 iPhoneX以上机型适配判断
判断iPhone X之后带刘海的机型

iOS11之后新增了一个safeAreaInsets属性

可以利用 CGFloat a = [[UIApplication sharedApplication] delegate].window.safeAreaInsets.bottom；

当a大于0时即是iPhone X ，XR，XS ，XS Max等。

if (@available(iOS 11.0, *)) {
        CGFloat a =  [[UIApplication sharedApplication] delegate].window.safeAreaInsets.bottom;
        NSLog(@"%f",a);
    } else {
        // Fallback on earlier versions
    }

#define IPHONE_X \
({BOOL isPhoneX = NO;\
if (@available(iOS 11.0, *)) {\
isPhoneX = [[UIApplication sharedApplication] delegate].window.safeAreaInsets.bottom > 0.0;\
}\
(isPhoneX);})

#define isIphoneX ({\
BOOL isPhoneX = NO;\
if (@available(iOS 11.0, *)) {\
    if (!UIEdgeInsetsEqualToEdgeInsets([UIApplication sharedApplication].delegate.window.safeAreaInsets, UIEdgeInsetsZero)) {\
    isPhoneX = YES;\
    }\
}\
isPhoneX;\
})

swift

func isiPhoneXScreen() -> Bool {
        guard #available(iOS 11.0, *) else {
            return false
        }
 
        return UIApplication.shared.windows[0].safeAreaInsets != UIEdgeInsets.zero
}