59 lines
1.8 KiB
Swift
59 lines
1.8 KiB
Swift
//
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// CombineExt.swift
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// Crush
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//
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// Created by Leon on 2025/8/7.
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//
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import Combine
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import UIKit
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extension UITextField {
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var textPublisher: AnyPublisher<String?, Never> {
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NotificationCenter.default.publisher(for: UITextField.textDidChangeNotification, object: self)
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.map { ($0.object as? UITextField)?.text }
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.eraseToAnyPublisher()
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}
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}
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extension UITextView {
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var textPublisher: AnyPublisher<String?, Never> {
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NotificationCenter.default
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.publisher(for: UITextView.textDidChangeNotification, object: self)
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.map { ($0.object as? UITextView)?.text }
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.eraseToAnyPublisher()
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}
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}
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extension Publishers {
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/*
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使用：
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Publishers.eitherLatest(container.$whoIm, container.$birthdayDate)
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.sink { whoIm, birthday in
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// whoIm: String?
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// birthday: Date?
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print("更新 -> whoIm=\(whoIm ?? "nil"), birthday=\(birthday?.description ?? "nil")")
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}
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.store(in: &cancellables)
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*/
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/// 当任一上游（输出为 Optional）更新时触发，输出为两者的“最新快照”
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static func eitherLatest<A, B, P1: Publisher, P2: Publisher>(
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_ p1: P1,
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_ p2: P2
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) -> AnyPublisher<(A?, B?), Never>
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where P1.Output == A?, P2.Output == B?, P1.Failure == Never, P2.Failure == Never {
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let left = p1.map { value -> (A?, B?) in (value, nil as B?) }
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let right = p2.map { value -> (A?, B?) in (nil as A?, value) }
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return Publishers.Merge(left, right)
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// 记住历史最新值：新的非 nil 覆盖对应位；nil 则沿用旧值
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.scan((nil as A?, nil as B?)) { last, new in
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(new.0 ?? last.0, new.1 ?? last.1)
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}
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.eraseToAnyPublisher()
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}
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}
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