iOS获取LaunchImage图片，解决iPhone XS Max取图不正确的问题

Swift版本

  func getLaunchImage() -> UIImage {
        var lauchImg        : UIImage!
        var viewOrientation : String!
        let viewSize        = UIScreen.main.bounds.size
        let scale           = UIScreen.main.scale  
        let orientation     = UIApplication.shared.statusBarOrientation
        if orientation == .landscapeLeft || orientation == .landscapeRight {
            viewOrientation = "Landscape"
        } else {
            viewOrientation = "Portrait"
        }
        let imgsInfoArray = Bundle.main.infoDictionary!["UILaunchImages"]
        for dict : Dictionary  in imgsInfoArray as! Array {
            let imageSize = NSCoder.cgSize(for: dict["UILaunchImageSize"]!)
            if __CGSizeEqualToSize(imageSize, viewSize) && viewOrientation == dict["UILaunchImageOrientation"]! as String {
                let img = UIImage(named: dict["UILaunchImageName"]!)
                /*打印上面的启动页图片数组可以看到：
                {
                    UILaunchImageMinimumOSVersion = "12.0";
                    UILaunchImageName = "LaunchImage-1200-Portrait-2688h";
                    UILaunchImageOrientation = Portrait;
                    UILaunchImageSize = "{414, 896}";
                },
                {
                    UILaunchImageMinimumOSVersion = "12.0";
                    UILaunchImageName = "LaunchImage-1200-Portrait-1792h";
                    UILaunchImageOrientation = Portrait;
                    UILaunchImageSize = "{414, 896}";
                },
                iPhone XS Max会取到iPhone XR的启动页，所以造成显示不正确，需加入下面的判断，oc代码一样，就不添加了
                */
                if img.scale == scale {
                    launchImg = img
                    break
                }
            }
        }
        return lauchImg
    }

Object-C版本，需加入上面注释部分的逻辑

- (UIImage *)getLaunchImage {
    UIImage *launchImg = [[UIImage alloc] init];
    NSString *orientation = @"";
    CGSize screenSize = [UIScreen mainScreen].bounds.size;
    UIInterfaceOrientation statusBarOrientation = [[UIApplication sharedApplication] statusBarOrientation];
    if (statusBarOrientation == UIInterfaceOrientationLandscapeLeft || statusBarOrientation == UIInterfaceOrientationLandscapeRight) {
        orientation = @"Landscape";
    } else {
        orientation = @"Portrait";
    }
    NSArray *imgsInfoArr = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"UILaunchImages"];
    for (NSDictionary *info in imgsInfoArr) {
        CGSize imgSize = CGSizeFromString(info[@"UILaunchImageSize"]);
        if (CGSizeEqualToSize(imgSize, screenSize) && [orientation isEqualToString:info[@"UILaunchImageOrientation"]] ) {
            launchImg = [UIImage imageNamed:info[@"UILaunchImageName"]];
        }
    }
    return launchImg;
}