Question

怎么读取picker view的行数或数据

按了button没有反应，应该是数据根本没读到element1和element2里面去，怎么改啊？我想点一下按钮把行数或者数据读进去。

import UIKit

class ViewController: UIViewController {

override func viewDidLoad() {
super.viewDidLoad()

// Do any additional setup after loading the view, typically from a nib.
}

@IBOutlet weak var pickerView: UIView!

let myDataA=NSArray(objects: "Fe","Al","Si","Cu","C")
let myDataB=NSArray(objects: "Fe","Al","Si","Cu","C")

func numberOfComponentsInPickerView(pickerview: UIPickerView) -> Int{
return 2
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if component==0 {
return myDataA.count
}else{
return myDataB.count
}
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String!{
if component==0 {
return "\(myDataA.objectAtIndex(row))"
}else{
return "\(myDataB.objectAtIndex(row))"
}
}

@IBAction func click(sender: AnyObject) {
func pickerView(pickerView:UIPickerView,didSelectedRow row:Int,inComponent component:Int){
let element1=pickerView.selectedRowInComponent(0)
let element2=pickerView.selectedRowInComponent(1)

let alertController = UIAlertController(title: "提示", message: String(element1)+String(element2), preferredStyle: UIAlertControllerStyle.Alert)
let action = UIAlertAction(title: "确定", style: UIAlertActionStyle.Cancel, handler: nil)
alertController.addAction(action)
self.presentViewController(alertController, animated: true, completion: nil)

}
}

override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}

}

Answer 1

import UIKit

class ViewController: UIViewController {

override func viewDidLoad() {
super.viewDidLoad()

// Do any additional setup after loading the view, typically from a nib.
}

@IBOutlet weak var pickerView: UIView!

let myDataA=NSArray(objects: "Fe","Al","Si","Cu","C")
let myDataB=NSArray(objects: "Fe","Al","Si","Cu","C")

func numberOfComponentsInPickerView(pickerview: UIPickerView) -> Int{
return 2
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if component==0 {
return myDataA.count
}else{
return myDataB.count
}
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String!{
if component==0 {
return "\(myDataA.objectAtIndex(row))"
}else{
return "\(myDataB.objectAtIndex(row))"
}
}

@IBAction func click(sender: AnyObject) {
func pickerView(pickerView:UIPickerView,didSelectedRow row:Int,inComponent component:Int){
let element1=pickerView.selectedRowInComponent(0)
let element2=pickerView.selectedRowInComponent(1)

let alertController = UIAlertController(title: "提示", message: String(element1)+String(element2), preferredStyle: UIAlertControllerStyle.Alert)
let action = UIAlertAction(title: "确定", style: UIAlertActionStyle.Cancel, handler: nil)
alertController.addAction(action)
self.presentViewController(alertController, animated: true, completion: nil)

}
}

override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}

}