EUI ViewStack实现选项卡组件 （封装了一个UI类）

/**
 * 选项卡UI
 * @author chenkai 2018/8/3
 */
class TabView{
	private radioGroup:eui.Group;    //单选按钮
	private viewStack:eui.ViewStack; //层叠容器

	public constructor() {

	}

	public init(radioGroup:eui.Group, viewStack:eui.ViewStack){
		//保存
		this.radioGroup = radioGroup;
		this.viewStack = viewStack;

		//判断是否存在按钮
		let radioBtn:eui.RadioButton = radioGroup.getChildAt(0) as eui.RadioButton;
		if(radioBtn){
			//给radioBtn赋值
			let len = radioGroup.numChildren;
			for(let i=0;i<len;i++){
				(radioGroup.getChildAt(i) as eui.RadioButton).value = i;
			}
			//监听radioBtn切换
			radioBtn.group.addEventListener(eui.UIEvent.CHANGE, this.onChange ,this);
			//默认选择第一项
			radioBtn.selected = true;
		}
	}	

	//radioBtn切换时，切换viewStack
	private onChange(e:eui.UIEvent){
		let radioGroup:eui.RadioButtonGroup = e.target;
        this.viewStack.selectedIndex = radioGroup.selectedValue;
	}
}

class HomeScene extends eui.Component{
	private radioGroup:eui.Group;
	private viewStack:eui.ViewStack;

	private tabView:TabView;

	public constructor() {
		super();
		this.skinName = "HomeSceneSkin";
	}

	protected childrenCreated(){
　　　　　　　　  //创建TabView
		this.tabView = new TabView();
               //将HomeScene里的单选按钮和层叠容器，赋值给TabView进行初始化
		this.tabView.init(this.radioGroup, this.viewStack);
	}

}