Swift －滚动选择器

来源：互联网发布：模糊c均值聚类算法编辑：程序博客网时间：2024/04/26 13:14
先来看看效果
这里写图片描述
滚动选择器博主以前有写过Object－C版本的，地址：http://blog.csdn.net/codingfire/article/details/51684247
这里是用Swift写的，其实核心代码都差不多，也就不再做详细说明了，先看下主要代码：
import UIKitclass LHHScrollView: UIView,UIScrollViewDelegate {    /*    // Only override drawRect: if you perform custom drawing.    // An empty implementation adversely affects performance during animation.    override func drawRect(rect: CGRect) {        // Drawing code    }    */    var mainScrollView = UIScrollView()    var titleScrollView = UIScrollView()    var underLine = UIView()    var _titleArray = NSArray()    var selectIndex:Int = 0    var cacheVC = CacheVC()    /**     初始化方法     - parameter frame:      定义大小范围     - parameter titleArray: 盛放标题     - returns: nil     */    init(frame:CGRect , titleArray:NSArray) {        super.init(frame: frame)        _titleArray = NSArray(array: titleArray)        self.backgroundColor = UIColor.lightGrayColor()        self.creatMainScrollView(UIColor.whiteColor())        self.creatSelectBtn(_titleArray)        self.creatTitleScrollView()    }    /**     创建滚动界面     - parameter bgColor: 设置滚动条背景颜色     */    func creatMainScrollView(bgColor:UIColor) {        mainScrollView.bounces = false        mainScrollView.frame = CGRectMake(0, 0, WIDTH, HEIGHT-64)        mainScrollView.showsHorizontalScrollIndicator = false        mainScrollView.showsVerticalScrollIndicator = false        mainScrollView.userInteractionEnabled = true        mainScrollView.delegate = self        mainScrollView.contentSize = CGSizeMake(CGFloat(_titleArray.count) * WIDTH, HEIGHT - 64)        mainScrollView.scrollEnabled = true        mainScrollView.pagingEnabled = true        mainScrollView.backgroundColor = bgColor        self.addSubview(mainScrollView)    }    /**     创建滚动条     */    func creatTitleScrollView() {        titleScrollView.bounces = false        titleScrollView.frame = CGRectMake(0, 0, WIDTH, 42)        titleScrollView.showsHorizontalScrollIndicator = false        titleScrollView.showsVerticalScrollIndicator = false        titleScrollView.userInteractionEnabled = true        titleScrollView.scrollEnabled = true        titleScrollView.backgroundColor = UIColor.lightGrayColor()        self.addSubview(titleScrollView)    }    /**     创建按钮和滑块     - parameter titleArray: 标题     */    func creatSelectBtn(titleArray:NSArray) {        var width:CGFloat        width = 5        for index in 0..<titleArray.count {            let btn = UIButton(type: .Custom)            btn.frame = CGRectMake(width, 5, self.legthOfTitle(titleArray[index] as! String)+30, 30)            btn.setTitle(titleArray[index] as? String, forState: .Normal)            btn.backgroundColor = UIColor.orangeColor()            btn.layer.cornerRadius = 5            btn.titleLabel?.font = UIFont.systemFontOfSize(13)            btn.setTitleColor(UIColor.blackColor(), forState: .Normal)            btn.tag = index + 50            btn.addTarget(self, action: #selector(self.btnAction(_:)), forControlEvents: .TouchUpInside)            titleScrollView.addSubview(btn)            let lineView = UIView(frame: CGRectMake(width, 39, self.legthOfTitle(titleArray[index] as! String)+30, 3))            lineView.tag = 100 + index            lineView.backgroundColor = UIColor.redColor()            lineView.hidden = true            titleScrollView.addSubview(lineView)            if index == 50 {                btn.setTitleColor(UIColor.redColor(), forState: .Selected)            }            if lineView.tag == 100 {                lineView.hidden = false            }            width = width + self.legthOfTitle(titleArray[index] as! String) + 30 + 10        }        selectIndex = 0        titleScrollView.contentSize = CGSizeMake(width, 40)        let viewVC = ViewController1()        viewVC.contentID =  "\(selectIndex)"        viewVC.view.frame = CGRectMake(0, 42, WIDTH, HEIGHT - 64 - 42)        mainScrollView.addSubview(viewVC.view)        cacheVC.addCurrentVC(selectIndex)    }    /**     计算标题长度     - parameter title: 标题     - returns: 标题长度     */    func legthOfTitle(title:String) -> CGFloat {        let attribute = [NSFontAttributeName: UIFont.systemFontOfSize(13)]//        let text: NSString = NSString(CString: title.cStringUsingEncoding(NSUTF8StringEncoding)!,encoding: NSUTF8StringEncoding)!        let option = NSStringDrawingOptions.UsesFontLeading        let size = title.boundingRectWithSize(CGSizeMake(1000, 30), options:option, attributes: attribute, context: nil)        return size.width    }    /**     点击按钮响应事件     - parameter btn: tag从50开始     */    func btnAction(btn:UIButton) {        selectIndex = btn.tag - 50        print(btn.tag)        /// 按钮和滑块变为未选状态        for var view in titleScrollView.subviews {            if view.isKindOfClass(UIButton) {                let button = view as! UIButton                button.setTitleColor(UIColor.blackColor(), forState: .Normal)            }            else            {                let lineView = view                 lineView.hidden = true            }        }        btn.setTitleColor(UIColor.redColor(), forState: .Normal)        let lineView = titleScrollView.viewWithTag(selectIndex + 100)        lineView?.hidden = false        /**         *  对当前控制器做处理         *         *  @param selectIndex 当前控制器标号         *         *  @return nil         */        if !cacheVC.vcArray.containsObject(selectIndex) {            let viewVC = ViewController1()            viewVC.contentID =  "\(selectIndex)"            viewVC.view.frame = CGRectMake(CGFloat(selectIndex) * WIDTH, 42, WIDTH, HEIGHT - 64 - 42)            mainScrollView.addSubview(viewVC.view)            cacheVC.addCurrentVC(selectIndex)        }        /**         *  设置偏移量         *         *  @param self.selectIndex 当前位置         *         *  @return nil         */        self.mainScrollView.contentOffset = CGPointMake(CGFloat(self.selectIndex) * WIDTH, 0)        /// 获取当前按钮左右按钮        let btnRight = titleScrollView.viewWithTag(btn.tag + 1)        let btnLeft = titleScrollView.viewWithTag(btn.tag - 1)        /**         *  通过位置判断偏移量         */        if (btn.frame.origin.x + btn.frame.size.width) > WIDTH - 10{            if btn.tag - 50 != _titleArray.count - 1 {                UIView.animateWithDuration(0.3, animations: {                    self.titleScrollView.contentOffset = CGPointMake(btnRight!.frame.origin.x + btnRight!.frame.size.width - WIDTH + 10, 0);                })            }        }        else        {            if selectIndex == 0 {                UIView.animateWithDuration(0.3, animations: {                    self.titleScrollView.contentOffset = CGPointMake(0, 0)                })            }            else            {                UIView.animateWithDuration(0.3, animations: {                    self.titleScrollView.contentOffset = CGPointMake(btnLeft!.frame.origin.x, 0)                })            }        }    }    required init?(coder aDecoder: NSCoder) {        fatalError("init(coder:) has not been implemented")    }    /**     scrollView代理方法     - parameter scrollView: 滑动界面相应事件     */    func scrollViewDidEndDecelerating(scrollView: UIScrollView) {        selectIndex = Int(mainScrollView.contentOffset.x / WIDTH)        /// 按钮和滑块变为未选状态        for var view in titleScrollView.subviews {            if view.isKindOfClass(UIButton) {                let button = view as! UIButton                button.setTitleColor(UIColor.blackColor(), forState: .Normal)            }            else            {                let lineView = view                lineView.hidden = true            }        }        let btn = titleScrollView.viewWithTag(selectIndex + 50) as! UIButton        btn.setTitleColor(UIColor.redColor(), forState: .Normal)        let lineView = titleScrollView.viewWithTag(selectIndex + 100)        lineView?.hidden = false        /**         *  对当前控制器做处理         *         *  @param selectIndex 当前控制器标号         *         *  @return nil         */        if !cacheVC.vcArray.containsObject(selectIndex) {            let viewVC = ViewController1()            viewVC.contentID =  "\(selectIndex)"            viewVC.view.frame = CGRectMake(CGFloat(selectIndex) * WIDTH, 42, WIDTH, HEIGHT - 64 - 42)            mainScrollView.addSubview(viewVC.view)            cacheVC.addCurrentVC(selectIndex)        }        /**         *  设置偏移量         *         *  @param self.selectIndex 当前位置         *         *  @return nil         */        self.mainScrollView.contentOffset = CGPointMake(CGFloat(selectIndex) * WIDTH, 0)        /// 获取当前按钮左右按钮        let btnRight = titleScrollView.viewWithTag(selectIndex + 50 + 1)        let btnLeft = titleScrollView.viewWithTag(selectIndex + 50 - 1)        /**         *  通过位置判断偏移量         */        if (btn.frame.origin.x + btn.frame.size.width) > WIDTH - 10{            if btn.tag - 50  != _titleArray.count - 1 {                UIView.animateWithDuration(0.3, animations: {                    self.titleScrollView.contentOffset = CGPointMake(btnRight!.frame.origin.x + btnRight!.frame.size.width - WIDTH + 10, 0);                })            }        }        else        {            if selectIndex == 0 {                UIView.animateWithDuration(0.3, animations: {                    self.titleScrollView.contentOffset = CGPointMake(0, 0)                })            }            else            {                UIView.animateWithDuration(0.3, animations: {                    self.titleScrollView.contentOffset = CGPointMake(btnLeft!.frame.origin.x, 0)                })            }        }    }}
代码中都给出了注释，还有不懂的请留言，下载地址：https://github.com/codeliu6572/Swift_Scroll_Select
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Swift － 滚动选择器

Swift －滚动选择器
