最初，我想在选择UITableViewCell或UILabel时实现选择器。
最好的方法是1.子类化UItextfield并将其inputView设置为选择器。2.使该文本字段成为didSelectRowAtIndexPath中的FirstResponder
在下面回答
最好的做法是将UITextfield子类化，并执行以下操作：
class PickerTextField: UITextField, UIPickerViewDataSource, UIPickerViewDelegate {
var picker:UIPickerView = CustomUIPickerView()
var pickerHours: Int = 0
var pickerMinutes: Int = 0
var pickerSeconds: Int = 0
var pickerTotal: Int = 0
override func awakeFromNib() {
super.awakeFromNib()
picker.delegate = self
picker.dataSource = self
}
override func layoutSubviews() {
super.layoutSubviews()
(pickerHours,pickerMinutes,pickerSeconds) = MakeTimeFromString(self.text!)
self.inputView = configurePicker()
self.inputAccessoryView = configureAccessoryView()
}
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
// Prevent textfield from editing
return false
}
func configurePicker() -> UIView {
picker.selectRow(pickerHours, inComponent: 0, animated: true)
picker.selectRow(pickerMinutes, inComponent: 1, animated: true)
picker.selectRow(pickerSeconds, inComponent: 2, animated: true)
return picker
}
func configureAccessoryView() -> UIView {
let inputAccessoryView = UIToolbar(frame: CGRectMake(0.0, 0.0, UIScreen.mainScreen().bounds.size.width, 44))
inputAccessoryView.barStyle = UIBarStyle.BlackTranslucent
let flex = UIBarButtonItem(barButtonSystemItem: .FlexibleSpace, target: self, action: nil)
// Configure done button
let doneButton = UIBarButtonItem()
doneButton.title = "Done"
doneButton.tintColor = UIColor.greenColor()
doneButton.action = Selector("dismissPicker")
inputAccessoryView.items = NSArray(array: [flex, doneButton]) as? [UIBarButtonItem]
return inputAccessoryView
}
// Disallow selection or editing and remove caret
override func caretRectForPosition(position: UITextPosition) -> CGRect {
return CGRectZero
}
override func selectionRectsForRange(range: UITextRange) -> [AnyObject] {
return []
}
override func canPerformAction(action: Selector, withSender sender: AnyObject?) -> Bool {
UIMenuController.sharedMenuController().menuVisible = false
if action == "copy:" || action == "selectAll:" || action == "paste:" {
return false
}
return super.canPerformAction(action, withSender:sender)
}
func dismissPicker () {
self.resignFirstResponder()
}
//MARK: - UIPickerView Functions
// returns the number of 'columns' to display.
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 3
}
// returns the # of rows in each component..
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if component == 0 {
return 24
}
return 60
}
func pickerView(pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {
let title = String(row)
let attributedString = NSAttributedString(string: title, attributes: [NSForegroundColorAttributeName: UIColor.whiteColor()])
pickerView.backgroundColor = UIColor.clearColor()
return attributedString
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if component == 0 {
pickerHours = row
} else if component == 1 {
pickerMinutes = row
} else if component == 2 {
pickerSeconds = row
}
pickerTotal = AssembleTimeFromComponents(pickerHours, minutesComponent: pickerMinutes, secondsComponent: pickerSeconds)
UpdateLabel()
}
func UpdateLabel() {
self.text = MakeTimeLabel(pickerTotal, type: "Routine")
self.sizeToFit()
}
}
对于更通用的库，请尝试：https : //github.com/gtsif21/UIKeyboardLikePickerTextField
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