各个

另外 要准备的启动图大小：

iPhone X : 1125 x 2436

iPhone XR：828px x 1792px

iPhone XS Max: 1242px x 2688px

判断X系列：

static inline BOOL isIPhoneXSeries() { 

BOOL iPhoneXSeries = NO; 

if (UIDevice.currentDevice.userInterfaceIdiom != UIUserInterfaceIdiomPhone) { 

return iPhoneXSeries; }

 if (@available(iOS 11.0, *)) {

 UIWindow *mainWindow = [[[UIApplication sharedApplication] delegate] window]; 

       iPhoneXSeries = YES; if (mainWindow.safeAreaInsets.bottom > 0.0) { 

    } 

  } 

return iPhoneXSeries;

 }