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 = self
pickerview.delegate = self
// 设置选择框的默认值
pickerview.selectRow(0,inComponent:0,animated:true)
pickerview.selectRow(0,inComponent:1,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: UIPickerViewDataSource
func 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: UIPickerViewDelegate
func 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,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,forComponent component: Int) -> String? { }"设置与自定义视图"func pickerView(pickerView: UIPickerView,reusingView view: UIView?) -> UIView { }"不能同时设置，否则只有自定义视图有效。
