swift3-省、市、区地址选择器，plist格式数据（UIPickerView）

【Summary】

This article mainly introduces the basic usage of UIPickerView, we can obtain address information by selecting the provinces ,cities and districts.

【Explanation and Effect Picture】

The cities and districts will change when you switch the province
Districts will change when you switch the city
Click the confirm button,then the information label will show the address you choose

【Preparation】

Before we start ,we need a plist which contains all address information.
The data format is as follows:

swift3-省、市、区地址选择器，plist格式数据（UIPickerView）_第2张图片

This is part of the source code:

【Function Realization】

Get data from address.plist,and save it as NSDictionary in the local
2.The addressPickView will load all provinces, we choose the first city and the first district of the city as default
Realize the func of UIPickerViewDelegate and UIPickerViewDataSource,refresh the addressPickView by reloadComponent()
Realize the click action of the confirm button


import UIKit
class ViewController: UIViewController,UIPickerViewDelegate,UIPickerViewDataSource{
    
    //pickerview 视图
    @IBOutlet weak var addressPickView: UIPickerView!
    
     //用于显示地址的label
    @IBOutlet weak var addressLabel: UILabel!
    
    //省 数组
    var provincesData:NSArray!
    //市 数组
    var citiesData:NSArray!
    //区 数组
    var districtsData:NSArray!
    
    //省 字典
    var provincesList:NSDictionary!
    //市 字典
    var citiesList:NSDictionary!
    
    //选择的省
    var selectedProvince:String!
    //选择的市
    var selectedCity:String!
    //选择的区
    var selectedDistrict:String!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        
        //得到本地文件路径
        let addressPath = Bundle.main.path(forResource: "address", ofType: "plist")
        //得到字典类型数据
        let dicPList = NSDictionary(contentsOfFile: addressPath!)!
        
        self.provincesList = dicPList
        self.provincesData = self.provincesList.allKeys as NSArray!
        
        //初始化
        //默认取出第一个省、市、区的数据
        self.selectedProvince = self.provincesData[0] as! String
        self.citiesList = self.provincesList[selectedProvince] as! NSDictionary
        self.citiesData = self.citiesList.allKeys as NSArray!
        self.selectedCity = self.citiesData[0] as! String
        self.districtsData = self.citiesList[selectedCity] as! NSArray
        self.selectedDistrict = self.districtsData[0] as! String
        
        self.addressPickView.delegate = self
        self.addressPickView.dataSource = self
        
        
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
   //确认按钮，显示最新地址
    @IBAction func commitTapped(_ sender: Any) {
        self.addressLabel.text = "\(self.selectedProvince!)"+"\(self.selectedCity!)"+"\(self.selectedDistrict!)"
    }
    
    //UIPickerViewDataSource
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 3
    }
    
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if component  == 0 {
            return self.provincesData.count
        }else if component == 1 {
            return self.citiesData.count
        }else{
            return self.districtsData.count
        }
    }
    
    //UIPickerViewDelegate
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        if component  == 0 {
            return self.provincesData[row] as? String
        }else if component == 1 {
            return self.citiesData[row] as? String
        }else{
            return self.districtsData[row] as? String
        }
    }
    
    
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        if component  == 0 {
            self.selectedProvince = self.provincesData[row] as! String
            self.citiesList = self.provincesList[selectedProvince] as! NSDictionary
            self.citiesData = citiesList.allKeys as NSArray
            self.selectedCity = self.citiesData[0] as! String
            self.districtsData = self.citiesList[selectedCity] as! NSArray
            self.selectedDistrict = self.districtsData[0] as! String
            self.addressPickView.reloadComponent(1)
            self.addressPickView.reloadComponent(2)
            NSLog("选择的省"+selectedProvince)
        }else if component == 1 {
            self.selectedCity = self.citiesData[row] as! String
            self.districtsData = self.citiesList[selectedCity] as! NSArray
            self.selectedDistrict = self.districtsData[0] as! String
            self.addressPickView.reloadComponent(2)
            
            NSLog("选择的市"+selectedCity)
        }else{
            self.selectedDistrict = self.districtsData[row] as! String
            NSLog("选择的区"+selectedDistrict)
        }
    }
    
}

【Download Source Code】

http://download.csdn.net/detail/nc_jingjing/9788521

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