// .pch 文件中寫(xiě)
// 判斷是iPhone機(jī)型
/*

• 4s 960 * 640

• 5/5s 1136 x 640

• 6/6s/7/8 4.7英寸 1334 x 750

• 6p/6sp/7p/8p 5.5英寸 1920 x 1080

• X 5.8英寸 2436 x 1125
  }
  */

   #define IS_IPHONE_4s [UIScreen instancesRespondToSelector:@selector(currentMode)] ? \
     CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : \ 
     NO
  
   #define IS_IPHONE_5s [UIScreen instancesRespondToSelector:@selector(currentMode)] ? \
     CGSizeEqualToSize(CGSizeMake(640, 1136), [[UIScreen mainScreen] currentMode].size) : \
     NO
  
   #define IS_IPHONE_6s [UIScreen instancesRespondToSelector:@selector(currentMode)] ? \
     CGSizeEqualToSize(CGSizeMake(750, 1334), [[UIScreen mainScreen] currentMode].size) : \
      NO
  
   #define IS_IPHONE_6sp [UIScreen instancesRespondToSelector:@selector(currentMode)] ? \
     CGSizeEqualToSize(CGSizeMake(1080, 1920), [[UIScreen mainScreen] currentMode].size) : \
     NO
  
   #define IS_IPHONE_X [UIScreen instancesRespondToSelector:@selector(currentMode)] ? \
     CGSizeEqualToSize(CGSizeMake(1125, 2436), [[UIScreen mainScreen] currentMode].size) : \
     NO
  
   #define IS_IPHONE_X [UIScreen instancesRespondToSelector:@selector(currentMode)] ? \
     CGSizeEqualToSize(CGSizeMake(1125, 2436), [[UIScreen mainScreen] currentMode].size) : \
     NO
  

// 上面的表達(dá)方式和下面的一樣，都是用的三目運(yùn)算符，只是沒(méi)有加行尾的“\”

   #define IS_IPHONE_X [UIScreen instancesRespondToSelector:@selector(currentMode)] ?      CGSizeEqualToSize(CGSizeMake(1125, 2436), [[UIScreen mainScreen] currentMode].size) : NO