DatePickerAlert + DateFormat

main/Common Classes/DatePickerAlert.swift

@@ -0,0 +1,91 @@
+import UIKit
+
+class DatePickerAlert: UIViewController {
+	
+	private var callback: (Date) -> Void
+	private let picker: UIDatePicker = {
+		let x = UIDatePicker()
+		let h = x.sizeThatFits(.zero).height
+		x.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: h)
+		return x
+	}()
+	
+	required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }
+	
+	@discardableResult required init(presentIn viewController: UIViewController, configure: ((UIDatePicker) -> Void)? = nil, onSuccess: @escaping (Date) -> Void) {
+		callback = onSuccess
+		super.init(nibName: nil, bundle: nil)
+		modalPresentationStyle = .custom
+		if #available(iOS 13.0, *) {
+			isModalInPresentation = true
+		}
+		presentIn(viewController, configure)
+	}
+	
+	internal override func loadView() {
+		let cancel = QuickUI.button("Cancel", target: self, action: #selector(didTapCancel))
+		let save = QuickUI.button("Save", target: self, action: #selector(didTapSave))
+		save.titleLabel?.font = save.titleLabel?.font.bold()
+		//cancel.setTitleColor(.systemRed, for: .normal)
+		
+		let buttons = UIStackView(arrangedSubviews: [cancel, save])
+		buttons.axis = .horizontal
+		buttons.distribution = .fillEqually
+		
+		let bg = UIView(frame: picker.frame)
+		bg.frame.size.height += buttons.frame.height + 15
+		bg.frame.origin.y = UIScreen.main.bounds.height - bg.frame.height - 15
+		bg.backgroundColor = .sysBg
+		bg.addSubview(picker)
+		bg.addSubview(buttons)
+		
+		let clearBg = UIView()
+		clearBg.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+		clearBg.addSubview(bg)
+		
+		picker.anchor([.leading, .trailing, .top], to: bg)
+		picker.bottomAnchor =&= buttons.topAnchor
+		buttons.anchor([.leading, .trailing], to: bg)
+		buttons.bottomAnchor =&= bg.bottomAnchor - 15
+		bg.anchor([.leading, .trailing, .bottom], to: clearBg)
+		
+		view = clearBg
+		view.isHidden = true // otherwise picker will flash on present
+	}
+	
+	@objc private func didTapSave() {
+		dismiss(animated: true) {
+			self.callback(self.picker.date)
+		}
+	}
+	
+	@objc private func didTapCancel() {
+		dismiss(animated: true)
+	}
+	
+	private func presentIn(_ viewController: UIViewController, _ configure: ((UIDatePicker) -> Void)? = nil) {
+		viewController.present(self, animated: false) {
+			let control = self.view.subviews.first!
+			let prev = control.frame.origin.y
+			control.frame.origin.y += control.frame.height
+			self.view.isHidden = false
+			
+			configure?(self.picker)
+			
+			UIView.animate(withDuration: 0.3) {
+				self.view.backgroundColor = UIColor.black.withAlphaComponent(0.5)
+				control.frame.origin.y = prev
+			}
+		}
+	}
+	
+	override func dismiss(animated flag: Bool, completion: (() -> Void)? = nil) {
+		UIView.animate(withDuration: 0.3, animations: {
+			let control = self.view.subviews.first!
+			self.view.backgroundColor = .clear
+			control.frame.origin.y += control.frame.height
+		}) { _ in
+			super.dismiss(animated: false, completion: completion)
+		}
+	}
+}