我正在创建XIB / datePicker类,当用户点击按钮时,将通过调用viewController以编程方式对其进行调用。如何使用自动约束将该视图直接放置在调用按钮的下方并与之对齐。我的代码可以纵向运行,但是在旋转设备时会失败(datePicker不会重新居中)。可能是因为我将CGRect传递为视图init的参数,但旋转时并没有改变。我看不到任何其他替代CGRect传递的方法。添加自动约束代码时,会出现运行时自动格式化错误。
ViewController:
@IBAction func showMyDatePicker(_ sender: Any) {
showMyDatePicker.isEnabled = false
let today = Date()
let minDate = Calendar.current.date(byAdding: .month, value: -3, to: today)
let maxDate = Calendar.current.date(byAdding: .month, value: 3, to: today)
let datePickerWidth = 300
let datePickerHeight = 200
let datePickerX = Int(showMyDatePicker.center.x - CGFloat(datePickerWidth / 2))
let datePickerY = Int(showMyDatePicker.center.y + CGFloat(showMyDatePicker.bounds.height / 2))
let frame = CGRect(x: datePickerX, y: datePickerY, width: datePickerWidth, height: datePickerHeight)
myDatePicker = MyDatePicker(frame: frame)
myDatePicker?.setMyDatePicker(date: today, minimumDate: minDate!, maximumDate: maxDate!)
myDatePicker?.delegate = self
self.view.addSubview(myDatePicker!)
}
datePickerClass:
class MyDatePicker: UIView {
var delegate: MyDatePickerDelegate?
@IBOutlet var contentView: UIView!
@IBOutlet weak var datePicker: UIDatePicker!
@IBOutlet weak var returnButton: UIButton!
@IBAction func datePickerChanged(_ sender: Any) {
delegate?.dateFromDatePicker(date: datePicker.date, closeDatePickerView: false)
}
@IBAction func returnButtonTapped(_ sender: Any) {
delegate?.dateFromDatePicker(date: datePicker.date, closeDatePickerView: true)
}
override init(frame: CGRect) {
super.init(frame: frame)
initView()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
initView()
}
private func initView() {//QUESTION: how can I set the datepicker initial values within here
// Instantiate the view from xib file
let contentView = Bundle.main.loadNibNamed("MyDatePicker", owner: self, options: nil)?.first as? UIView
// Check that it's not nil
guard contentView != nil else {
return
}
// Add the view and set its frame
addSubview(contentView!)
contentView?.frame = self.bounds
contentView?.autoresizingMask = [.flexibleHeight, .flexibleWidth]
}
func setMyDatePicker(date: Date, minimumDate: Date, maximumDate: Date) {
datePicker.date = date
datePicker.minimumDate = minimumDate
datePicker.maximumDate = maximumDate
}
}
答案 0 :(得分:1)
只需在addSubview
之后添加所需的约束并将TAMIC
设置为false,如下所示:
@IBAction func showMyDatePicker(_ sender: UIButton) {
// ...
view.addSubview(myDatePicker!)
myDatePicker.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
myDatePicker.topAnchor.constraint(equalTo: sender.bottomAnchor),
myDatePicker.centerXAnchor.constraint(equalTo: sender.centerXAnchor)])
}