iOS get lauchImage

GetLaunchImage.m

    NSDictionary *launchImageNames = @{
                                       @"320x480" : @"[email protected]",
                                       @"320x568" : @"[email protected]",
                                       @"375x667" : @"[email protected]",
                                       @"414x736" : @"[email protected]"
                                      };
    NSString *aspect = [NSString stringWithFormat:@"%@x%@",@([UIScreen mainScreen].bounds.size.width),@([UIScreen mainScreen].bounds.size.height)];
    UIImage *launchImage = [UIImage imageNamed:launchImageNames[aspect]];