import UIKit
class KeyboardViewController: UIInputViewController {
// MARK: - Properties
private var keyboardView: KeyboardView!
private var heightConstraint: NSLayoutConstraint!
private var hasInitialLayout = false
// 存储系统键盘高度和动画参数
private var systemKeyboardHeight: CGFloat = 300
private var keyboardAnimationDuration: Double = 0.25
private var keyboardAnimationCurve: UIView.AnimationOptions = .curveEaseInOut
// MARK: - Lifecycle
override func viewDidLoad() {
super.viewDidLoad()
setupKeyboard()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// 在视图显示前更新键盘高度，避免闪动
if !hasInitialLayout {
hasInitialLayout = true
}
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
}
// MARK: - Setup
private func setupKeyboard() {
// 创建键盘视图
keyboardView = KeyboardView()
keyboardView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(keyboardView)
// 设置约束 - 确保键盘贴紧屏幕底部
NSLayoutConstraint.activate([
keyboardView.leftAnchor.constraint(equalTo: view.leftAnchor),
keyboardView.rightAnchor.constraint(equalTo: view.rightAnchor),
keyboardView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
])
// 设置初始高度约束（使用系统键盘高度或默认值）
let initialHeight = systemKeyboardHeight
heightConstraint = keyboardView.heightAnchor.constraint(equalToConstant: initialHeight)
heightConstraint.isActive = true
}
// MARK: - Layout Events
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
}
override func viewSafeAreaInsetsDidChange() {
super.viewSafeAreaInsetsDidChange()
}
// MARK: - 键盘高度请求
// 这个方法可以确保键盘扩展报告正确的高度给系统
override func updateViewConstraints() {
super.updateViewConstraints()
// 确保我们的高度约束是最新的
if heightConstraint == nil {
let height = systemKeyboardHeight > 0 ? systemKeyboardHeight : 216
heightConstraint = NSLayoutConstraint(
item: self.view!,
attribute: .height,
relatedBy: .equal,
toItem: nil,
attribute: .notAnAttribute,
multiplier: 0.0,
constant: height
)
heightConstraint.priority = UILayoutPriority(999)
view.addConstraint(heightConstraint)
} else {
let height = systemKeyboardHeight > 0 ? systemKeyboardHeight : 216
heightConstraint.constant = height
}
}
}
// MARK: - Keyboard View Implementation
class KeyboardView: UIView {
private var keysContainer: UIStackView!
override init(frame: CGRect) {
super.init(frame: frame)
setupView()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
setupView()
}
private func setupView() {
backgroundColor = UIColor(red: 0.82, green: 0.84, blue: 0.86, alpha: 1.0)
// 创建按键容器
keysContainer = UIStackView()
keysContainer.axis = .vertical
keysContainer.distribution = .fillEqually
keysContainer.spacing = 8
keysContainer.translatesAutoresizingMaskIntoConstraints = false
addSubview(keysContainer)
// 添加约束 - 确保内容在安全区域内
NSLayoutConstraint.activate([
keysContainer.topAnchor.constraint(equalTo: safeAreaLayoutGuide.topAnchor, constant: 8),
keysContainer.leftAnchor.constraint(equalTo: safeAreaLayoutGuide.leftAnchor, constant: 8),
keysContainer.rightAnchor.constraint(equalTo: safeAreaLayoutGuide.rightAnchor, constant: -8),
keysContainer.bottomAnchor.constraint(equalTo: safeAreaLayoutGuide.bottomAnchor, constant: -8)
])
// 添加键盘行
}
}
