[寒江孤叶丶的CrossApp之旅_08][入门系列]CASegmentedControl的简单介绍

来源：互联网发布：进口数据编辑：程序博客网时间：2024/06/13 23:09

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博客地址：http://blog.csdn.net/qq446569365

CASegmentedControl相当于Android中的TabView。在开发过程中十分常用。

CASegmentedControl使用起来并不负责，寥寥几行代码便可搞定。

    segment = CASegmentedControl::createWithCenter(CADipRect(size.width*0.5,size.height*0.3, size.width*0.8, size.height*0.1), 3);    segment->setTitleAtIndex("Page0", 0, CAControlStateAll);//根据index设置标题文字    segment->setTitleAtIndex("Page1", 1, CAControlStateAll);    segment->setTitleAtIndex("Page2", 2, CAControlStateAll);    segment->setTitleColorAtIndex(CAColor_white, 0, CAControlStateAll);    //根据index设置颜色    segment->setTitleColorAtIndex(CAColor_gray, 1, CAControlStateAll);    segment->setTitleColorAtIndex(CAColor_yellow, 2, CAControlStateAll);    segment->setSelectedAtIndex(1);    //设置当前选中项    segment->addTarget(this, CAControl_selector(MainMenuViewController::segmentCallback));//设置点击回调函数    this->getView()->addSubview(segment);

并设置一个回调函数

void MainMenuViewController::segmentCallback(CAControl* btn, CCPoint point){    switch (segment->getselectedIndex())    {        case 0:        {            label->setText("The first page");//替换为相关操作即可            break;        }        case 1:        {            label->setText("The second page");            break;        }        case 2:        {            label->setText("The third page");            break;        }        default:            break;    }}

其中有一点需要说明，如果在会掉函数中通过setTag 和getSubViewByTag的方式获得 View，会出现空指针的问题，（不知道是不是我的方法不对，希望高手解答），所以在此我的方法是将segment和label都设置为类的成员函数。

CASegmentedControl可以设置背景图案，方法如下：

    char segNormal[50] = "";    char segHighlighted[50] = "";    char segSelected[50] = "";    char pages[10] = "";    segment = CASegmentedControl::createWithCenter(CADipRect(size.width*0.5,size.height*0.3, size.width*0.8, size.height*0.1), 3);    for (int i = 0; i < 3; i++)    {                sprintf(segNormal,"source_material/seg_normal%d.png",i+1);        sprintf(segHighlighted,"source_material/seg_highlighted%d.png",i+1);        sprintf(segSelected,"source_material/seg_selected%d.png",i+1);        sprintf(pages, "Number%d", i + 1);        segment->setTitleAtIndex(pages, i, CAControlStateAll);        segment->setBackgroundImageAtIndex(CAImage::create(segNormal), i, CAControlStateNormal);        segment->setBackgroundImageAtIndex(CAImage::create(segHighlighted), i, CAControlStateHighlighted);        segment->setBackgroundImageAtIndex(CAImage::create(segSelected), i, CAControlStateSelected);    }    segment->setTitleColorAtIndex(CAColor_white, 0, CAControlStateAll);    //根据index设置颜色    segment->setTitleColorAtIndex(CAColor_gray, 1, CAControlStateAll);    segment->setTitleColorAtIndex(CAColor_yellow, 2, CAControlStateAll);    segment->setSelectedAtIndex(1);    //设置当前选中项    segment->addTarget(this, CAControl_selector(MainMenuViewController::segmentCallback));//设置点击回调函数    this->getView()->addSubview(segment);

在CASegmentedControl的类中有两个有关开始点击，和取消点击的虚函数，如果需要设置相关监听，则需要对CASegmentedControl类进行集成，然后重写这两个函数，这两个函数分别是：

    virtual void onExitTransitionDidStart();    virtual void onEnterTransitionDidFinish();

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