forked from zelo72/mastodon-ios
94 lines
2.6 KiB
Swift
94 lines
2.6 KiB
Swift
//
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// UIView+Gesture.swift
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// Mastodon
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//
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// Created by sxiaojian on 2021/4/14.
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//
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import Combine
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import Foundation
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import UIKit
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struct GesturePublisher: Publisher {
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typealias Output = GestureType
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typealias Failure = Never
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private let view: UIView
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private let gestureType: GestureType
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init(view: UIView, gestureType: GestureType) {
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self.view = view
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self.gestureType = gestureType
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}
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func receive<S>(subscriber: S) where S: Subscriber,
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GesturePublisher.Failure == S.Failure, GesturePublisher.Output
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== S.Input
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{
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let subscription = GestureSubscription(
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subscriber: subscriber,
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view: view,
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gestureType: gestureType
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)
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subscriber.receive(subscription: subscription)
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}
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}
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enum GestureType {
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case tap(UITapGestureRecognizer = .init())
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case swipe(UISwipeGestureRecognizer = .init())
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case longPress(UILongPressGestureRecognizer = .init())
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case pan(UIPanGestureRecognizer = .init())
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case pinch(UIPinchGestureRecognizer = .init())
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case edge(UIScreenEdgePanGestureRecognizer = .init())
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func get() -> UIGestureRecognizer {
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switch self {
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case let .tap(tapGesture):
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return tapGesture
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case let .swipe(swipeGesture):
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return swipeGesture
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case let .longPress(longPressGesture):
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return longPressGesture
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case let .pan(panGesture):
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return panGesture
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case let .pinch(pinchGesture):
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return pinchGesture
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case let .edge(edgePanGesture):
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return edgePanGesture
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}
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}
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}
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class GestureSubscription<S: Subscriber>: Subscription where S.Input == GestureType, S.Failure == Never {
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private var subscriber: S?
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private var gestureType: GestureType
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private var view: UIView
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init(subscriber: S, view: UIView, gestureType: GestureType) {
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self.subscriber = subscriber
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self.view = view
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self.gestureType = gestureType
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configureGesture(gestureType)
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}
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private func configureGesture(_ gestureType: GestureType) {
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let gesture = gestureType.get()
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gesture.addTarget(self, action: #selector(handler))
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view.addGestureRecognizer(gesture)
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}
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func request(_ demand: Subscribers.Demand) {}
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func cancel() {
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subscriber = nil
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}
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@objc
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private func handler() {
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_ = subscriber?.receive(gestureType)
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}
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}
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extension UIView {
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func gesture(_ gestureType: GestureType = .tap()) -> GesturePublisher {
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isUserInteractionEnabled = true
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return GesturePublisher(view: self, gestureType: gestureType)
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}
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}
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