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June 5, 2018 08:12
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FourthPickerRow (未完成
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// | |
// Quadruple.swift | |
// PingBa | |
// | |
// Created by Anson on 2018/6/5. | |
// Copyright © 2018年 Zoeker.Inc. All rights reserved. | |
// | |
import Foundation | |
import Eureka | |
public struct Tuple4<A: Equatable, B: Equatable, C: Equatable, D:Equatable> { | |
public let a: A | |
public let b: B | |
public let c: C | |
public let d: D | |
public init(a: A, b: B, c: C, d:D) { | |
self.a = a | |
self.b = b | |
self.c = c | |
self.d = d | |
} | |
} | |
extension Tuple4: Equatable {} | |
public func == <A: Equatable, B: Equatable, C: Equatable, D:Equatable>(lhs: Tuple4<A, B, C, D>, rhs: Tuple4<A, B, C, D>) -> Bool { | |
return lhs.a == rhs.a && lhs.b == rhs.b && lhs.c == rhs.c && lhs.d == rhs.d | |
} | |
open class QuadruplePickerInputCell<A, B, C, D> : _PickerInputCell<Tuple4<A, B, C, D>> where A: Equatable, B: Equatable, C: Equatable, D:Equatable { | |
private var pickerRow: _QuadruplePickerInputRow<A, B, C, D>! { return row as? _QuadruplePickerInputRow<A, B, C, D> } | |
public required init(style: UITableViewCellStyle, reuseIdentifier: String?) { | |
super.init(style: style, reuseIdentifier: reuseIdentifier) | |
} | |
required public init?(coder aDecoder: NSCoder) { | |
super.init(coder: aDecoder) | |
} | |
open override func update() { | |
super.update() | |
if let selectedValue = pickerRow.value, let indexA = pickerRow.firstOptions().index(of: selectedValue.a), | |
let indexB = pickerRow.secondOptions(selectedValue.a).index(of: selectedValue.b), | |
let indexC = pickerRow.thirdOptions(selectedValue.a, selectedValue.b).index(of: selectedValue.c){ | |
picker.selectRow(indexA, inComponent: 0, animated: true) | |
picker.selectRow(indexB, inComponent: 1, animated: true) | |
picker.selectRow(indexC, inComponent: 2, animated: true) | |
} | |
} | |
open override func numberOfComponents(in pickerView: UIPickerView) -> Int { | |
return 3 | |
} | |
open override func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { | |
if component == 0 { | |
return pickerRow.firstOptions().count | |
} else if component == 1 { | |
return pickerRow.secondOptions(pickerRow.selectedFirst()).count | |
} else { | |
return pickerRow.thirdOptions(pickerRow.selectedFirst(), pickerRow.selectedSecond()).count | |
} | |
} | |
open override func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? { | |
if component == 0 { | |
return pickerRow.displayValueForFirstRow(pickerRow.firstOptions()[row]) | |
} else if component == 1 { | |
return pickerRow.displayValueForSecondRow(pickerRow.secondOptions(pickerRow.selectedFirst())[row]) | |
} else { | |
return pickerRow.displayValueForThirdRow(pickerRow.thirdOptions(pickerRow.selectedFirst(), pickerRow.selectedSecond())[row]) | |
} | |
} | |
open override func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { | |
if component == 0 { | |
let a = pickerRow.firstOptions()[row] | |
if let value = pickerRow.value { | |
guard value.a != a else { | |
return | |
} | |
let b: B = pickerRow.secondOptions(a).contains(value.b) ? value.b : pickerRow.secondOptions(a)[0] | |
let c: C = pickerRow.thirdOptions(a, b).contains(value.c) ? value.c : pickerRow.thirdOptions(a, b)[0] | |
let d: D = pickerRow.forthOptions(a, b, c).contains(value.d) ? value.d : pickerRow.forthOptions(a, b, c)[0] | |
pickerView.reloadComponent(1) | |
pickerView.reloadComponent(2) | |
pickerRow.value = Tuple4(a: a, b: b, c: c, d:d) | |
if b != value.b { | |
pickerView.selectRow(0, inComponent: 1, animated: true) | |
} | |
if c != value.c { | |
pickerView.selectRow(0, inComponent: 2, animated: true) | |
} | |
} else { | |
let b = pickerRow.secondOptions(a)[0] | |
let c = pickerRow.thirdOptions(a,b)[0] | |
pickerRow.value = Tuple4(a: a, b: b, c: pickerRow.thirdOptions(a, b)[0],d:pickerRow.forthOptions(a, b,c)[0]) | |
pickerView.reloadComponent(1) | |
pickerView.reloadComponent(2) | |
pickerView.selectRow(0, inComponent: 1, animated: true) | |
pickerView.selectRow(0, inComponent: 2, animated: true) | |
} | |
} else if component == 1 { | |
let a = pickerRow.selectedFirst() | |
let b = pickerRow.secondOptions(a)[row] | |
if let value = pickerRow.value { | |
guard value.b != b else { | |
return | |
} | |
if pickerRow.thirdOptions(a, b).contains(value.c) { | |
pickerRow.value = Tuple4(a: a, b: b, c: value.c, d: <#D#>) | |
pickerView.reloadComponent(2) | |
update() | |
return | |
} else { | |
pickerRow.value = Tuple4(a: a, b: b, c: pickerRow.thirdOptions(a, b)[0]) | |
} | |
} else { | |
pickerRow.value = Tuple4(a: a, b: b, c: pickerRow.thirdOptions(a, b)[0]) | |
} | |
pickerView.reloadComponent(2) | |
pickerView.selectRow(0, inComponent: 2, animated: true) | |
} else { | |
let a = pickerRow.selectedFirst() | |
let b = pickerRow.selectedSecond() | |
pickerRow.value = Tuple4(a: a, b: b, c: pickerRow.thirdOptions(a, b)[row]) | |
} | |
update() | |
} | |
} | |
open class _QuadruplePickerInputRow<A: Equatable, B: Equatable, C: Equatable, D:Equatable> : Row<QuadruplePickerInputCell<A, B, C, D>>, NoValueDisplayTextConformance { | |
open var noValueDisplayText: String? = nil | |
/// Options for first component. Will be called often so should be O(1) | |
public var firstOptions: (() -> [A]) = {[]} | |
/// Options for second component given the selected value from the first component. Will be called often so should be O(1) | |
public var secondOptions: ((A) -> [B]) = {_ in []} | |
/// Options for third component given the selected value from the first and second components. Will be called often so should be O(1) | |
public var thirdOptions: ((A, B) -> [C]) = {_, _ in []} | |
public var forthOptions:((A, B, C) -> [D]) = {_,_,_ in []} | |
/// Modify the displayed values for the first picker row. | |
public var displayValueForFirstRow: ((A) -> (String)) = { a in return String(describing: a) } | |
/// Modify the displayed values for the second picker row. | |
public var displayValueForSecondRow: ((B) -> (String)) = { b in return String(describing: b) } | |
/// Modify the displayed values for the third picker row. | |
public var displayValueForThirdRow: ((C) -> (String)) = { c in return String(describing: c) } | |
required public init(tag: String?) { | |
super.init(tag: tag) | |
} | |
func selectedFirst() -> A { | |
return value?.a ?? firstOptions()[0] | |
} | |
func selectedSecond() -> B { | |
return value?.b ?? secondOptions(selectedFirst())[0] | |
} | |
} | |
/// A generic row where the user can pick an option from a picker view displayed in the keyboard area | |
public final class QuadruplePickerInputRow<A, B, C, D>: _QuadruplePickerInputRow<A, B, C, D>, RowType where A: Equatable, B: Equatable, C: Equatable, D:Equatable{ | |
required public init(tag: String?) { | |
super.init(tag: tag) | |
self.displayValueFor = { [weak self] tuple in | |
guard let tuple = tuple else { | |
return self?.noValueDisplayText | |
} | |
return String(describing: tuple.a) + ", " + String(describing: tuple.b) + ", " + String(describing: tuple.c) | |
} | |
} | |
} |
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