/** 
 支持iPhone和iPad, 支持横屏、竖屏，
 获取app的启动图片名称，并设置为本控制器背景图片
 */
- (void)getLaunchImageName{
    
    NSString *launchImageName = @"";  //启动图片名称变量
    CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height; //屏幕高度
    CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width; //屏幕宽度
    
    //设备界面方向
    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    
    BOOL isPortrait = UIInterfaceOrientationIsPortrait(orientation);// 是否竖屏
    BOOL isLandscape = UIInterfaceOrientationIsLandscape(orientation);//是否横屏
    
    //获取与当前设备匹配的启动图片名称
    //4、4S 竖屏，横屏
    if ((isPortrait && screenHeight == 480) || (isLandscape && screenWidth == 480)){
        launchImageName = @"LaunchImage-700";
    }
    //5、5C、5S、iPod 竖屏，横屏
    else if ((isPortrait && screenHeight == 568) || (isLandscape && screenWidth == 568)){
        launchImageName = @"LaunchImage-700-568h";
    }
    //6、6S 竖屏，横屏
    else if ((isPortrait && screenHeight == 667) || (isLandscape && screenWidth == 667)){
        launchImageName = @"LaunchImage-800-667h";
    }
    //6Plus、6SPlus竖屏
    else if (isPortrait && screenHeight == 736){
        launchImageName = @"LaunchImage-800-Portrait-736h";
    }
    //6Plus、6SPlus 横屏
    else if (isLandscape && screenWidth == 736){
        launchImageName = @"LaunchImage-800-Landscape-736h";
    }
    //iPad 竖屏
    else if (isPortrait && screenHeight == 1024){
        launchImageName = @"LaunchImage-700-Portrait";
    }
    //iPad 横屏
    else if (isLandscape && screenWidth == 1024){
        launchImageName = @"LaunchImage-700-Landscape";
    }
    
    if (launchImageName.length < 1) return;
    
    //设备启动图片为控制器的背景图片
    UIImage *img = [UIImage imageNamed:launchImageName];
    self.view.backgroundColor = [UIColor colorWithPatternImage:img];
}