获取当前尺寸启动图

- (UIImage *)getTheLaunchImage
 {
    CGSize viewSize = [UIScreen mainScreen].bounds.size;

  NSString *viewOrientation = nil;
  if (([[UIApplication sharedApplication] statusBarOrientation] ==     UIInterfaceOrientationPortraitUpsideDown) || ([[UIApplication   sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortrait)) {
      viewOrientation = @"Portrait";
  } else {
      viewOrientation = @"Landscape";
  }


  NSString *launchImage = nil;

  NSArray* imagesDict = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"UILaunchImages"];
  for (NSDictionary* dict in imagesDict)
  {
      CGSize imageSize = CGSizeFromString(dict[@"UILaunchImageSize"]);
    
      if (CGSizeEqualToSize(imageSize, viewSize) && [viewOrientation   isEqualToString:dict[@"UILaunchImageOrientation"]])
      {
          launchImage = dict[@"UILaunchImageName"];
      }
  }

  return [UIImage imageNamed:launchImage];

}
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