xcode 从特定时间限制 UIDatePicker 日期。例如输入 DOB 到受限制的年龄限制
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Limiting UIDatePicker dates from a particular time. Such as Input DOB to a restricted age limit
提问by Martin Q
In my code, I have a UITextField that when the user taps on opens a UIDatePicker to enable the user to easily and efficiently scroll through to their Date Of Birth. Obviously, we wouldn't want the UIDatePicker to scroll up to 2015 and over as it currently does. As it's a Date Of Birth entry field, i would also need to be able to limit entries to 16years+. How do i do this?
在我的代码中，我有一个 UITextField，当用户点击它时会打开一个 UIDatePicker，使用户能够轻松有效地滚动到他们的出生日期。显然，我们不希望 UIDatePicker 像目前那样滚动到 2015 年及以上。由于它是出生日期输入字段，因此我还需要能够将输入限制为 16 年以上。我该怎么做呢？
class SignUpViewController: UIViewController, UITextFieldDelegate {
var datePicker:UIDatePicker!
@IBOutlet weak var dateTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// UI DATE PICKER SETUP
var customView:UIView = UIView(frame: CGRectMake(0, 100, 320, 160))
customView.backgroundColor = UIColor.clearColor()
datePicker = UIDatePicker(frame: CGRectMake(0, 0, 320, 160))
datePicker.datePickerMode = UIDatePickerMode.Date
customView.addSubview(datePicker)
dateTextField.inputView = customView
var doneButton:UIButton = UIButton (frame: CGRectMake(100, 100, 100, 44))
doneButton.setTitle("Done", forState: UIControlState.Normal)
doneButton.addTarget(self, action: "datePickerSelected", forControlEvents: UIControlEvents.TouchUpInside)
doneButton.backgroundColor = UIColor .grayColor()
dateTextField.inputAccessoryView = doneButton
回答by Leo Dabus
You can use dateByAddingUnit and subtract 16 years from current date to set the maximum date for your datePicker as follow:
您可以使用 dateByAddingUnit 并从当前日期减去 16 年来设置 datePicker 的最大日期，如下所示：
datePicker.maximumDate = NSCalendar.currentCalendar().dateByAddingUnit(.Year, value: -16, toDate: NSDate(), options: [])
Xcode 10.2.1 ? Swift 5
Xcode 10.2.1 ? 斯威夫特 5
datePicker.maximumDate = Calendar.current.date(byAdding: .year, value: -16, to: Date())
回答by SentientBacon
UIDatePickerhas a maximumDatethat you can set. Simply set the mode to "Date" in IB and add:
datePicker.maximumDate = NSDate(timeIntervalSinceNow: -504911232)
UIDatePicker有一个maximumDate你可以设置。只需在 IB 中将模式设置为“日期”并添加：
datePicker.maximumDate = NSDate(timeIntervalSinceNow: -504911232)
-504911232 means 16 before today(accounting leap years)
-504911232 表示今天之前的 16（会计闰年）
