xcode 有没有办法在 Swift 上隐藏 UIDatePicker？
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Is there a way to hide the UIDatePicker on Swift?
提问by SwaggyMcMuffins
I am trying to hide my datepicker until my textField is selected. I did this simply for a pickerView I have. However, I have not been able to find a solution using Swift to show then hide the datePicker on a textField.
我试图隐藏我的日期选择器，直到我的 textField 被选中。我这样做只是为了我拥有的pickerView。但是，我无法找到使用 Swift 显示然后隐藏 textField 上的 datePicker 的解决方案。
import UIKit
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource, UITextFieldDelegate {
@IBOutlet weak var TeeTimes: UILabel!
@IBOutlet weak var textFieldDate: UITextField!
@IBOutlet weak var datePicker: UIDatePicker!
@IBOutlet weak var picker: UIPickerView! = UIPickerView()
@IBOutlet weak var textfieldCourse: UITextField!
var pickerData = ["Norman Course", "Riding Golf", "Dmob Course"]
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
picker.hidden = true;
self.textfieldCourse.delegate = self
self.picker.delegate = self
self.picker.dataSource = self
textfieldCourse.text = pickerData[0]
//Inputs the data into the array
datePicker.hidden = true;
datePicker.addTarget(self, action: Selector("datePickerChanged:"), forControlEvents: UIControlEvents.ValueChanged)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) ->Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) ->Int {
return pickerData.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return pickerData[row]
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int){
textfieldCourse.text = pickerData[row]
picker.hidden = true
}
func textFieldShouldBeginEditing(textfield: UITextField) ->Bool {
picker.hidden = false
return false
}
func datePickerChanged(dataPicker: UIDatePicker) {
datePicker.hidden = false
let dateFormatter = NSDateFormatter()
dateFormatter.dateStyle = NSDateFormatterStyle.ShortStyle
let strDate = dateFormatter.stringFromDate(datePicker.date)
textFieldDate.text = strDate
}
}
}
采纳答案by Dennis G.
I can't see why you wouldn't be able to use the same principle, seeing as both UIDatePickerand UIPickerVieware subclasses of UIView. Simply set the delegate of textFieldDateto selfand apply the same logic within textFieldShouldBeginEditing. Only you will have to check which text field is being edited in order to show the correct picker.
我不明白为什么你不能使用相同的原则，因为UIDatePicker和UIPickerView都是UIView 的子类。只需将textFieldDate的委托设置为self并在textFieldShouldBeginEditing 中应用相同的逻辑。只有您必须检查正在编辑哪个文本字段才能显示正确的选择器。
Additionally, you should set datePicker.hiddento truein your datePickerChangedfunction assuming you want the date picker to hide after a date has been selected.
此外，假设您希望在选择日期后隐藏日期选择器，您应该在datePickerChanged函数中将datePicker.hidden设置为true。
回答by hacker_1989
We can definitely use auto layout and set constraints to hide the space and collapse different views. You can set auto layout for different objects and set the height of date picker. Drag and drop the height constraint in your controller and provide a name:
我们绝对可以使用自动布局并设置约束来隐藏空间和折叠不同的视图。您可以为不同的对象设置自动布局并设置日期选择器的高度。在控制器中拖放高度约束并提供名称：
.
.
It will look something like this:
它看起来像这样：
Next set the constraint to 0 in your viewDidLoad()like this: datePickerHeight.constant = 0
接下来将约束设置为 0，viewDidLoad()如下所示：datePickerHeight.constant = 0
Now where you are hiding your datePicker set the height to 0 and when you are showing the datePicker set the height to the desired height. You can use:
现在您隐藏 datePicker 的位置将高度设置为 0，当您显示 datePicker 时，将高度设置为所需的高度。您可以使用：
if dateTimePicker.hidden {
dateTimePicker.hidden = false
datePickerHeight.constant = 135
} else {
dateTimePicker.hidden = true
datePickerHeight.constant = 0
}
