我的 pickerView
上有 3 列,它代表一个 3 位数。是否有任何功能可以添加到 UIButton
来使轮子转动?例如,当它显示“119”时,按下 UIButton
,它应该转到“120”。这是我到目前为止所拥有的:
class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
@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)"
}
最佳答案
这是您的代码,已简化。 buttonPressed
将导致 pickerView
转到下一个数字。当它达到 999 时,它又变回 000。
class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
@IBOutlet weak var label: UILabel!
@IBOutlet weak var pickerView: UIPickerView!
override func viewDidLoad() {
super.viewDidLoad()
changeLabelText()
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 3
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return "\(row)"
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return 10
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
changeLabelText()
}
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))"
}
}
关于ios - 将按钮添加到 UIPickerView 以转到下一个数字,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46183030/