On the introduction of Swift development: selector (Uipickerview)

reprint Please declare source: http://blog.csdn.net/jinnchang/article/details/44487269
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1, Summary
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2. Code

viewcontroller.swift//uipickerviewsample////Created by Jinnchang on 15/3/18.//Copyright (c) 2015 Jinn Chang. All rights Reserved.//import Uikitclass Viewcontroller:uiviewcontroller, Uipickerviewdelegate,        Uipickerviewdatasource {var mypickerview:uipickerview?        var provinces = [string: [string]] () var cities = [String] () override Func Viewdidload () {//Load data Provinces = ["Zhejiang Province": ["Hangzhou City", "Ningbo"], "Anhui Province": ["Huangshan", "Hefei"]] cities = provinces.values.array[0]//define a button, Make the data return to the default state let Button1 = Uibutton.buttonwithtype (. System) as? UIButton button1? frame = CGRectMake (SELF.VIEW.FRAME.WIDTH/2-$, +,-) button1? Settitle ("Back to Default state", ForState:UIControlState.Normal) button1?. AddTarget (Self, Action: "Buttonaction:", ForControlEvents:UIControlEvents.TouchUpInside) button1?. Tag = 1//define a button to refresh all data let Button2 = Uibutton.buttonwithtype (. System) as? UIButton Button2?. frame = CGRectMake (SELF.VIEW.FRAME.WIDTH/2-$, button2,.) Settitle ("Refresh all elements", forState:UIControlState.Normal) button2?. AddTarget (Self, Action: "Buttonaction:", ForControlEvents:UIControlEvents.TouchUpInside) button2?. Tag = 2//Define a button that displays the currently selected provinces and cities let Button3 = Uibutton.buttonwithtype (. System) as? UIButton Button3? frame = CGRectMake (SELF.VIEW.FRAME.WIDTH/2-$, +,--) Button3? Settitle ("Show currently selected provinces and cities", ForState:UIControlState.Normal) Button3?. AddTarget (Self, Action: "Buttonaction:", ForControlEvents:UIControlEvents.TouchUpInside) Button3?. Tag = 3//Initialize Mypickerview Mypickerview = Uipickerview (Frame:cgrectmake (0, Self.view.frame.height -Mypickerview, Self.view.frame.width, ())? delegate = Self Mypickerview?. DataSource = self//show check box, IOS7 will not work after Mypickerview?  Showsselectionindicator = False Self.view.addSubview (button1!)      Self.view.addSubview (button2!)        Self.view.addSubview (button3!)    Self.view.addSubview (mypickerview!)        }//Set number of columns Func Numberofcomponentsinpickerview (pickerview:uipickerview), Int {return 2} Set number of rows func pickerview (Pickerview:uipickerview, Numberofrowsincomponent component:int), Int {if (compone NT = = 0) {return provinces.keys.array.count} if (component = = 1) {return Provinces.cou NT} return 0}//Set the specific contents of each line (Titleforrow and Viewforrow both implement one) Func Pickerview (Pickerview:uipi Ckerview, Titleforrow row:int, Forcomponent component:int), string! {if (component = = 0) {return Provinces.keys.array[row]} if (component = = 1) {RE Turn Cities[row]} return nil}//The operation of the selected row func Pickerview (Pickerview:uipickerview, Didselectro    W row:int, Incomponent component:int) {if (component = = 0) {        Cities = provinces[provinces.keys.array[row]]! Reload level two option and reset Mypickerview?. Reloadcomponent (1) mypickerview?        SelectRow (0, Incomponent:1, animated:true)}}///Response button click event func buttonaction (Sender:uibutton) { Let num = sender.tag switch num {Case 1://restore data and reset provinces = ["Zhejiang Province": ["Hangzhou City", "Ning Wave City "]," Anhui Province ": [" Huangshan "," Hefei "]] cities = provinces.values.array[0] Mypickerview?. Reloadallcomponents () Mypickerview? SelectRow (0, incomponent:0, animated:true) Mypickerview? SelectRow (0, Incomponent:1, animated:true) Case 2://Load new data and reset provinces = ["Zhejiang": ["Hangzhou", "Ningbo" ], "Anhui": ["Huangshan", "Hefei"]] cities = provinces.values.array[0] Mypickerview? Reloadallcomponents () Mypickerview? SelectRow (0, incomponent:0, animated:true) Mypickerview?   SelectRow (0, Incomponent:1, animated:true) Case 3:         Displays the currently selected provinces and cities let Provincenum = Mypickerview?. Selectedrowincomponent (0) Let Citynum = Mypickerview?. Selectedrowincomponent (1) println ("Province:\ (provinces.keys.array[provincenum!)");        City:\ (cities[citynum!]) Default:break}}}

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3, ResourceProject on Github address: uipickerviewsample

Article last updated:. The resources are as follows:

Uipickerview Class Reference

UIKit User Interface catalog:picker views

On the introduction of Swift development: selector (Uipickerview)