我试图从int
中读取UIPickerView
s,我已经这样做了,但这只是UILabel
上的打印。这一次我需要数据,这样我可以为每个数字放声音,这样我就可以做一个队列播音器(它是一个3位数的UIPickerView
,从“001”到“999”开始)。看,我不知道代码给每个组件的选定数字一个声音。(我已经通过AVFoundation
导入了声音,但我不会将其粘贴到代码中)。正如我在评论中提到的,转换不是我的问题。所以这个问题是新的。
以下是我目前掌握的情况:
import UIKit
import AVFoundation
class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
//Picker View Settings
@IBOutlet weak var label: UILabel!
@IBOutlet weak var pickerView: UIPickerView!
let numbers = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 3
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return numbers[row]
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return numbers.count
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
let val1 = numbers[pickerView.selectedRow(inComponent: 0)]
let val2 = numbers[pickerView.selectedRow(inComponent: 1)]
let val3 = numbers[pickerView.selectedRow(inComponent: 2)]
label.text = "\(val1) \(val2) \(val3)"
}
//"Next" Button Setting
fileprivate func num(_ i: Int) -> Int {
return pickerView.selectedRow(inComponent: i)
}
@IBAction func buttonPressed() {
let currentNum = num(0) * 100 + num(1) * 10 + num(2)
let nextNum = currentNum + 1
pickerView.selectRow(nextNum % 1000 / 100, inComponent: 0, animated: true)
pickerView.selectRow(nextNum % 100 / 10, inComponent: 1, animated: true)
pickerView.selectRow(nextNum % 10, inComponent: 2, animated: true)
changeLabelText()
}
fileprivate func changeLabelText() {
label.text = "\(num(0)) \(num(1)) \(num(2))"
}
//Announcer Button
@IBAction func soundPlayed(_ sender: Any) {
//Don't have any function yet, because of my question.
}
最佳答案
有一种更好的方法来处理您要处理的代码。不要用绳子。使用数字。
下面的代码以Int
的形式跟踪当前值。它会随着选择器值的更改而更新。在任何需要知道选择器当前值的方法中使用currentValue
。
其思想是不使用视图来保存数据。视图只显示数据。把数据分开存放。
class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
@IBOutlet weak var label: UILabel!
@IBOutlet weak var pickerView: UIPickerView!
var currentValue = 0
func updateCurrentValue() {
// Use max(0, xxx) since `selectedRow` can return -1 if the component has no selection
let hundreds = max(0, pickerView.selectedRow(inComponent: 0))
let tens = max(0, pickerView.selectedRow(inComponent: 1))
let ones = max(0, pickerView.selectedRow(inComponent: 2))
currentValue = hundreds * 100 + tens * 10 + ones
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 3
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return String(row)
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return 10 // digits 0 - 9
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
updateCurrentValue()
changeLabelText()
}
@IBAction func buttonPressed() {
currentValue = (currentValue + 1) % 1000
pickerView.selectRow(currentValue / 100, inComponent: 0, animated: true)
pickerView.selectRow(currentValue / 10 % 10, inComponent: 1, animated: true)
pickerView.selectRow(currentValue % 10, inComponent: 2, animated: true)
changeLabelText()
}
fileprivate func changeLabelText() {
label.text = String(currentValue)
}
@IBAction func soundPlayed(_ sender: Any) {
// Do something with currentValue
}
关于ios - Swift:从UIPickerView读取,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/46289608/