swift中UIPickerView的使用

https://github.com/potato512/SYSwiftLearning

示例代码如下：

1、参数定义

let width:CGFloat = (UIScreen.mainScreen().bounds.size.width / 3.0)var label:UILabel?var addressArray:Array<AnyObject>?var cityArray:Array<AnyObject>?var areaArray:Array<AnyObject>?    var textSelected1:String!var textSelected2:String!var textSelected3:String!

2、数据源模拟

// 数据self.loadAddress()// MARK: - 数据func loadAddress(){        // 广西        let cityArea011 = ["cityName":"南宁市","cityArea":["南宁市","隆安县","武鸣县","马山县","宾阳县","横县","芭乐县","上林县"]]        let cityArea012 = ["cityName":"百色市","cityArea":["百色市","隆林各族自治县","西林县","田林县","乐业县","凌云县","田阳县","田东县","平果县","德宝县","靖西县","那坡县"]]        let cityArea013 = ["cityName":"桂林市","cityArea":["桂林市","龙胜各簇自治县","资源县","全州县","兴安县","灵川县","灌阳县","恭城瑶族自治县","平乐县","荔浦县","阳朔县","临桂县","永福县"]]        let provinceCity01 = ["provinceName":"广西省","provinceCity":[cityArea011,cityArea012,cityArea013]]        // 广东        let cityArea021 = ["cityName":"梅州市","cityArea":["梅江区","梅县","蕉岭县","大埔县","丰顺县","平远县","兴宁市"]]        let cityArea022 = ["cityName":"广州市","cityArea":["越秀","海珠","荔湾","天河","白云","黄埔","南沙","萝岗"]]        let cityArea023 = ["cityName":"深圳市","cityArea":["龙岗区","宝安区","光明新区","坪山新区","罗湖区","福田区","盐田区","南山区"]]        let cityArea024 = ["cityName":"惠州市","cityArea":["惠城区","惠东县","惠阳市","龙门县","博罗县"]]        let provinceCity02 = ["provinceName":"广东省","provinceCity":[cityArea021,cityArea022,cityArea023,cityArea024]]                self.addressArray = [provinceCity01, provinceCity02]                self.cityArray = []        self.areaArray = []}

3、picker view使用

3-1、初始化定义

// 实例化（注：UIPickerView的宽高默认分别是屏幕宽度、216的高度）let pickerview = UIPickerView()print(pickerview)self.view.addSubview(pickerview)pickerview.backgroundColor = UIColor.greenColor()        // 设置代理（注意添加代理协议，实现代理方法）pickerview.dataSource = selfpickerview.delegate = self        // 设置选择框的默认值pickerview.selectRow(0,inComponent:0,animated:true)pickerview.selectRow(0,inComponent:1,animated:true)pickerview.selectRow(0,inComponent:2,animated:true)        // 刷新数据// 刷新全部数据pickerview.reloadAllComponents()// 刷新某列数据// pickerview.reloadComponent(1)

3-2、添加协议

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {....}

3-3、代理方法实现

// MARK: - UIPickerViewDataSource, UIPickerViewDelegate// MARK: UIPickerViewDataSourcefunc numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int{        // 选择框列数        return 3}    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{        // 每个选择框的行数        if 0 == component        {            // 第一列            let count = self.addressArray!.count            return count        }        else if 1 == component        {            // 第二列            let count = self.cityArray!.count            return count        }        else if 2 == component        {            // 第三列            let count = self.areaArray!.count            return count        }                return 0}    // MARK: UIPickerViewDelegatefunc pickerView(pickerView: UIPickerView, widthForComponent component: Int) -> CGFloat{        // 每个选择框的行宽        return width}    func pickerView(pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat{        // 每个选择框的行高        return 40.0}    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String?{        // 每个选择框每行的显示内容        if 0 == component        {            // 第一列            let dictProvince = self.addressArray![row]            let province:String! = dictProvince.objectForKey("provinceName") as! String            return province        }        else if 1 == component        {            // 第二列            let dict = self.cityArray![row]            let city:String! = dict.objectForKey("cityName") as! String            return city        }        else if 2 == component        {            // 第三列            let area:String! = self.areaArray![row] as! String            return area        }                return nil}    func pickerView(pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString?{        // 每个选择框每行的显示副文本内容        return nil}    func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView{        // 每个选择框每行自定义视图        let label = UILabel(frame: CGRectMake(0.0, 0.0, width, 40.0))        label.backgroundColor = UIColor.orangeColor()        label.textAlignment = NSTextAlignment.Center                if 0 == component        {            // 第一列            let dict = self.addressArray![row]            let province:String! = dict.objectForKey("provinceName") as! String            label.text = province        }        else if 1 == component        {            // 第二列            let dict = self.cityArray![row]            let city:String! = dict.objectForKey("cityName") as! String            label.text = city        }        else if 2 == component        {            // 第三列            let area:String! = self.areaArray![row] as! String            label.text = area        }                return label}    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int){        // 每个选择框每行被选中的值        print(component, row)          if 0 == component        {            // 第一列时的行数//            textSelected1 = String("1列 \(row) 行")                        let dict = self.addressArray![row]            textSelected1 = dict.objectForKey("provinceName") as? String                        // 第二、三列关联改变            self.cityArray! = dict["provinceCity"] as! Array            pickerView.reloadComponent(1)            pickerView.selectRow(0, inComponent: 1, animated: true)            let dict2 = self.cityArray![0]            textSelected2 = dict2.objectForKey("cityName") as! String                        let dict3 = self.cityArray![0]            self.areaArray! = dict3["cityArea"] as! Array            pickerView.reloadComponent(2)            pickerView.selectRow(0, inComponent: 2, animated: true)            textSelected3 = self.areaArray![0] as! String        }        else if 1 == component        {            // 第二列时的行数//            textSelected2 = String("2列 \(row) 行")                        let dict = self.cityArray![row]            textSelected2 = dict.objectForKey("cityName") as! String                        // 第三列关联改变            self.areaArray! = dict["cityArea"] as! Array            pickerView.reloadComponent(2)            pickerView.selectRow(0, inComponent: 2, animated: true)            textSelected3 = self.areaArray![0] as! String        }        else if 2 == component        {            // 第三列时的行数//            textSelected3 = String("3列 \(row) 行。")                        textSelected3 = self.areaArray![row] as! String        }        let text = String("你选择了：\(textSelected1),\(textSelected2),\(textSelected3)")        self.label!.text = text}

4、显示选择结果

self.label = UILabel(frame: CGRectMake(10.0, (CGRectGetHeight(self.view.bounds) - 10.0 - 40.0), (CGRectGetWidth(self.view.bounds) - 10.0 * 2), 40.0))self.view.addSubview(self.label!)self.label!.backgroundColor = UIColor.yellowColor()self.label!.textColor = UIColor.redColor()self.label!.autoresizingMask = UIViewAutoresizing.FlexibleTopMargin

5、注意事项

（1）标题内容"func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? { }"设置与自定义视图"func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView { }"不能同时设置，否则只有自定义视图有效。