106 lines
3.7 KiB
Swift
106 lines
3.7 KiB
Swift
//
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// KeyboardAvoidingDialogView.swift
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// suixinkan
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//
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import SnapKit
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import UIKit
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/// 自定义居中弹窗的键盘避让基类，负责在键盘弹出时同步移动内容卡片。
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class KeyboardAvoidingDialogView: UIView {
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/// 需要避让键盘的弹窗内容视图，通常是白色卡片容器。
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var keyboardAvoidingContentView: UIView?
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/// 内容视图相对父视图的 centerY 约束，用于随键盘动画更新偏移。
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var keyboardAvoidingCenterYConstraint: Constraint?
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/// 内容视图与屏幕顶部、键盘顶部之间保留的最小距离。
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var keyboardAvoidingMinimumSpacing: CGFloat = AppSpacing.md
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private var keyboardObservers: [NSObjectProtocol] = []
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override init(frame: CGRect) {
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super.init(frame: frame)
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}
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@available(*, unavailable)
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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deinit {
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unregisterKeyboardObservers()
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}
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override func didMoveToSuperview() {
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super.didMoveToSuperview()
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if superview == nil {
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unregisterKeyboardObservers()
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} else {
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registerKeyboardObservers()
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}
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}
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private func registerKeyboardObservers() {
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unregisterKeyboardObservers()
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let center = NotificationCenter.default
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keyboardObservers = [
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center.addObserver(
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forName: UIResponder.keyboardWillChangeFrameNotification,
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object: nil,
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queue: .main
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) { [weak self] notification in
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self?.handleKeyboardNotification(notification)
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},
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center.addObserver(
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forName: UIResponder.keyboardWillHideNotification,
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object: nil,
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queue: .main
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) { [weak self] notification in
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self?.handleKeyboardNotification(notification)
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}
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]
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}
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private func unregisterKeyboardObservers() {
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keyboardObservers.forEach(NotificationCenter.default.removeObserver)
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keyboardObservers.removeAll()
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}
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private func handleKeyboardNotification(_ notification: Notification) {
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layoutIfNeeded()
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guard let userInfo = notification.userInfo else { return }
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let duration = (userInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0.25
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let curveRaw = (userInfo[UIResponder.keyboardAnimationCurveUserInfoKey] as? NSNumber)?.uintValue
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?? UInt(UIView.AnimationCurve.easeInOut.rawValue)
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let options = UIView.AnimationOptions(rawValue: curveRaw << 16)
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keyboardAvoidingCenterYConstraint?.update(offset: keyboardAvoidanceOffset(from: userInfo))
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UIView.animate(withDuration: duration, delay: 0, options: options) {
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self.layoutIfNeeded()
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}
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}
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private func keyboardAvoidanceOffset(from userInfo: [AnyHashable: Any]) -> CGFloat {
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guard
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let contentView = keyboardAvoidingContentView,
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let keyboardFrameValue = userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue
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else {
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return 0
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}
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let keyboardFrame = convert(keyboardFrameValue.cgRectValue, from: nil)
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guard keyboardFrame.minY < bounds.height else { return 0 }
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let contentHeight = contentView.bounds.height
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let baseMinY = bounds.midY - contentHeight / 2
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let baseMaxY = bounds.midY + contentHeight / 2
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let desiredBottom = keyboardFrame.minY - keyboardAvoidingMinimumSpacing
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let neededShift = max(0, baseMaxY - desiredBottom)
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let maxShift = max(0, baseMinY - keyboardAvoidingMinimumSpacing)
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return -min(neededShift, maxShift)
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}
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}
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