iOS 12 iPhoneXr、iPhoneXs、iPhoneXs Max 适配

分辨率：

iPhoneX ：2436 * 1125 || pt: 812 * 375
iPhoneXr：1792 * 828 || pt: 896 * 414
iPhoneXs：2436 * 1125 || pt: 812 * 375
iPhoneXs Max：2688 * 1242 || pt: 896 * 414

适配：

iPhoneXs 的屏幕尺寸和iPhoneX是一样的，所以不需要做特殊处理，只需要处理适配iPhoneXr和iPhoneXs Max。
由于navBar和tabBar的高度和iPhoneX是一样的，所以适配只需要在原来判断iPhoneX的基础上加上iPhoneXr和iPhoneXs Max的机型判断就好了。

//判断iPhoneX
#define IS_IPHONE_X ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(1125, 2436), [[UIScreen mainScreen] currentMode].size) && !isPad : NO)
//判断iPHoneXr
#define IS_IPHONE_Xr ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(828, 1792), [[UIScreen mainScreen] currentMode].size) && !isPad : NO)
//判断iPhoneXs
#define IS_IPHONE_Xs ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(1125, 2436), [[UIScreen mainScreen] currentMode].size) && !isPad : NO)
//判断iPhoneXs Max
#define IS_IPHONE_Xs_Max ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(1242, 2688), [[UIScreen mainScreen] currentMode].size) && !isPad : NO)

//iPhoneX系列
#define Height_StatusBar ((IS_IPHONE_X==YES || IS_IPHONE_Xr ==YES || IS_IPHONE_Xs== YES || IS_IPHONE_Xs_Max== YES) ? 44.0 : 20.0)
#define Height_NavBar ((IS_IPHONE_X==YES || IS_IPHONE_Xr ==YES || IS_IPHONE_Xs== YES || IS_IPHONE_Xs_Max== YES) ? 88.0 : 64.0)
#define Height_TabBar ((IS_IPHONE_X==YES || IS_IPHONE_Xr ==YES || IS_IPHONE_Xs== YES || IS_IPHONE_Xs_Max== YES) ? 83.0 : 49.0)

一些三方库里面判断iPhoneX基础上添加iPhoneXr、iPhoneXs、iPhoneXs Max的判断：

+ (BOOL)isIphoneX {
    struct utsname systemInfo;
    uname(&systemInfo);
    NSString *platform = [NSString stringWithCString:systemInfo.machine encoding:NSASCIIStringEncoding];
    if ([platform isEqualToString:@"i386"] || [platform isEqualToString:@"x86_64"]) {
        // judgment by height when in simulators
        return ((CGSizeEqualToSize([UIScreen mainScreen].bounds.size, CGSizeMake(375, 812)) ||
                 CGSizeEqualToSize([UIScreen mainScreen].bounds.size, CGSizeMake(812, 375))) || CGSizeEqualToSize([UIScreen mainScreen].bounds.size, CGSizeMake(414, 896)) ||
                CGSizeEqualToSize([UIScreen mainScreen].bounds.size, CGSizeMake(896, 414)));
    }
    BOOL isIPhoneX = [platform isEqualToString:@"iPhone10,3"] || [platform isEqualToString:@"iPhone10,6"] || [platform isEqualToString:@"iPhone11,2"] || [platform isEqualToString:@"iPhone11,4"] || [platform isEqualToString:@"iPhone11,6"] || [platform isEqualToString:@"iPhone11,8"];
    return isIPhoneX;
}