Hello world with UI

time to start a quick hello world with UI elements:

// include ZFUIKit.h for UI module of ZFFramework
// you may need to setup your project's include path first
#include "ZFUIKit.h"
 
ZFMAIN_ENTRY() {
    // typically we will start UI by creating a ZFUIWindow
    zfobj<ZFUIWindow> window;
    // show the window
    window->windowShow();
 
    // create a text view and set text content
    zfobj<ZFUITextView> textView;
    textView->text("hello world");
 
    // add to window
    window->childAdd(textView);
 
    // make it center in window
    textView->layoutParam()->layoutAlign(ZFUIAlign::e_Center);
}