Question

我是swift Xcode的新手，想在UIPickerView上获得一些帮助。

我正在尝试创建两个UIPickerViews，一个名为“From”，一个名为“To”。 “From”包含A，B和“To”包含B，C

基本上，如果“From”是A而“To”是B，则汽车的照片将出现在同一个viewController上。如果“From”是B而“To”是B则会出现草莓照片，依此类推。

任何人都可以给我任何关于如何做到这一点的提示吗？我只设法创建了第一个UIPickerView。

import UIKit

class ViewController: UIViewController,UIPickerViewDelegate, UIPickerViewDataSource {

    @IBOutlet var Picker1:UIPickerView!

    var Array = ["A","B","C"]

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib

        Picker1.delegate = self
        Picker1.dataSource = self
    }

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

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return Array[row]
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return Array.count
    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {   
        return 1
    }
}

Answer 1

var savedVal1 = "" as String
var savedVal2 = "" as String
var array1 = NSArray()
var array2 = NSArray()

override func viewDidLoad() {
    super.viewDidLoad()

    Picker1.delegate = self
    Picker1.dataSource = self
    Picker1.tag = 1

    Picker2.delegate = self
    Picker2.dataSource = self
    Picker2.tag = 2
}


func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    if pickerView.tag == 1 {
        return array1[row]
    }
    else{
       return array2[row]
    }
}


func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    if pickerView.tag == 1 {
       return array1.count
    }
    else{
       return array2.count
    }
}

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int{

    return 1
}

func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, inComponent component: Int){
        if pickerView.tag == 1 {
            savedVal1 = array1[row]
            // compare 2 values here & then take steps which fulfill your criteria.

        }
        else{
            savedVal2 = array2[row]
            //compare 2 values here & then take steps which fulfill your criteria.
        }
    }

希望它有所帮助。

Answer 2

你的PickerView2在哪里？

@IBOutlet var Picker2:UIPickerView!

在viewdidload加载中完成

Picker1.delegate = self
Picker1.dataSource = self

如果您使用相同的数据源或不同，请检查UIPickerViewDelegate中的选择器视图，UIPickerViewDataSource方法，如

 If (Picker1) {

} else if (Picker2) {

}

两个UIPickerViews和不同的组合导致不同的照片

2 个答案: