【发布时间】：2015-03-08 14:27:24
【问题描述】：
刚刚得到了一些很大的帮助，这使得 UIPickerView 轮子可以完美地工作，但是我一直在尝试让第二个和第三个组件中的数据根据第一个组件的位置而改变。
我可以通过一些 println 行来确定我提取 whatConversion 的变量具有正确的值，但我不知道如何更改数组并使用新值更新 UIPickerView。
请帮助我保持清醒，而且我将不得不在工作上花费额外的时间，因为我花了几乎一整天的时间在这些代码上。
提前致谢
莫蒂
import UIKit
class ViewController: UIViewController, UIPickerViewDelegate {
@IBOutlet weak var picker1Label: UILabel!
@IBOutlet weak var picker2Label: UILabel!
@IBOutlet weak var bigPicker: UIPickerView!
var wheelContents:[[String]] = []
var length = ["metres","feet","yards","inches","mm","cm","miles"]
var volume = ["m3","US Gall","Imp Gall","Barrels", "cubic FT","litres"]
var conType = ["length","volume"]
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
bigPicker.delegate = self
wheelContents = [conType, length, length]
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//For main selection of type of conversion
// returns the number of 'columns' to display.
func numberOfComponentsInPickerView(bigPicker: UIPickerView) -> Int{
return wheelContents.count
}
// returns the # of rows in each component..
func pickerView(bigPicker: UIPickerView, numberOfRowsInComponent component: Int) -> Int{
return wheelContents[component].count
}
func pickerView(bigPicker: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String!{
return wheelContents[component][row]
}
func pickerView(bigPicker: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
var whatConversion = wheelContents[0][bigPicker.selectedRowInComponent(0)]
switch(whatConversion){
case "length":
wheelContents = [conType, length, length]
bigPicker.numberOfRowsInComponent(wheelContents[component].count)
break
case "volume":
wheelContents = [conType, volume, volume]
break
default:
break
}
}
}
【问题讨论】：
标签： ios swift components uipickerview