iOS 获取当前手机屏幕的分辨率，不是屏幕的宽高

以下拿IphoneX为例

    #define APP_SCREEN_WIDTH   (APP_SCREEN_BOUNDS.size.width)
    #define APP_SCREEN_HEIGHT  (APP_SCREEN_BOUNDS.size.height)

    CGFloat screenScale = [UIScreen mainScreen].scale;
    // 横向分辨率
    CGFloat screenX = APP_SCREEN_WIDTH * screenScale;
    // 竖直分辨率
    CGFloat screenY = APP_SCREEN_HEIGHT * screenScale;
    NSLog(@"横向分辨率%lf 竖直分辨率%lf",screenX,screenY);

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