BottomKeyboardConstraint

示例

要运行示例项目，请克隆仓库，并先从 Example 目录运行 pod install

安装

BottomKeyboardConstraint 可以通过 CocoaPods 来使用。为了安装它，只需将以下行添加到您的 Podfile 中

pod 'BottomKeyboardConstraint'

描述

BottomKeyboardConstraint 是一个库，它使处理键盘事件、动画和消失变得简单和透明。

总是建议将配合键盘的视图控制器与 UIScrollView 配对。此库使用您设置的底部键盘来维持从底部到所选 UI 元素的距离。

只需将 bottomKeyboardConstraint 设置为连接底部布局指南/顶部父视图底部和定义的最底部的元素，库将完成其余工作。

整个库都作为 NSLayoutConstraint 的扩展来设置，通过简单的方法 registerAsBottomKeyboardConstraint(in: <KeyboardDelegate 对象>) 激活。

KeyboardDelegate 定义如下：

public protocol KeyboardDelegate {
    var bottomKeyboardConstraint: NSLayoutConstraint? { get set }

    var view: UIView! { get set }

    // Optional methods 
    func keyboardUpdated(withState state: KeyboardState)
    func keyboardShouldDismissAtTap() -> Bool // Default implementation returns true
}

可选地，您可以定义 keyboardUpdated(withState state: KeyboardState) 方法并监听以下键盘事件

public enum KeyboardState {
    case willUpdateHeight(from: CGFloat, to: CGFloat)
    case didShow
    case didSwitch
    case willHide
    case didHide
}

用法

//.. Import the library
import BottomKeyboardConstraint

//.. Make UIViewController or any other object a delegate for the keyboard
class ViewController: UIViewController, KeyboardDelegate {

//.. Declare a bottomKeyboardConstraint variable either as a @IBOutlet or create it in code and return it
@IBOutlet weak var bottomKeyboardConstraint: NSLayoutConstraint?
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //.. Setup the bottomKeyboardConstraint as the keyboard constraint to have it update as the keyboard shows/updates/hides.
        bottomKeyboardConstraint?.registerAsBottomKeyboardConstraint(in: self)
}

//.. Optionally you can also subscribe to the keyboard events
func keyboardUpdated(withState state: KeyboardState) {
    print(state)
}

//.. Optionally you can disable the tap to dismiss functionality when the keyboard is visible
func keyboardShouldDismissAtTap() -> Bool {
    return false
}

作者

Stefan Brighiu, [email protected]

许可证

BottomKeyboardConstraint 在 MIT 许可证下可用。有关更多信息，请参阅 LICENSE 文件。