宏定義一下：

//判斷是否是ipad
#define isPad ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad)
//判斷iPhone4系列
#define kiPhone4 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) && !isPad : NO)
//判斷iPhone5系列
#define kiPhone5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 1136), [[UIScreen mainScreen] currentMode].size) && !isPad : NO)
//判斷iPhone6 6s 7系列
#define kiPhone6 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(750, 1334), [[UIScreen mainScreen] currentMode].size) && !isPad : NO)
//判斷iPhone6p 6sp 7p系列
#define kiPhone6Plus ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(1242, 2208), [[UIScreen mainScreen] currentMode].size) && !isPad : NO)
//判斷iPhoneX，Xs（iPhoneX，iPhoneXs）
#define IS_IPHONE_X ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(1125, 2436), [[UIScreen mainScreen] currentMode].size) && !isPad : NO)
//判斷iPhoneXr
#define IS_IPHONE_Xr ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(828, 1792), [[UIScreen mainScreen] currentMode].size) && !isPad : NO)
//判斷iPhoneXsMax
#define IS_IPHONE_Xs_Max ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(1242, 2688), [[UIScreen mainScreen] currentMode].size)&& !isPad : NO)

//判斷iPhoneX所有系列
#define IS_PhoneXAll (IS_IPHONE_X || IS_IPHONE_Xr || IS_IPHONE_Xs_Max)
#define k_Height_NavContentBar 44.0f
#define k_Height_StatusBar (IS_PhoneXAll? 44.0 : 20.0)
#define k_Height_NavBar (IS_PhoneXAll ? 88.0 : 64.0)
#define k_Height_TabBar (IS_PhoneXAll ? 83.0 : 49.0)