53 lines
1.6 KiB
Plaintext
53 lines
1.6 KiB
Plaintext
import { NotificationCenter, OperationQueue, Notification } from "Foundation";
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import { UIResponder } from "UIKit";
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import { CGRect } from "CoreFoundation";
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// 监听键盘高度变化
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@UTSJS.keepAlive
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export function keyboardHeightChange(callback : (h : number) => void):()=>void {
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let lastHeight = 0
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const showObserver = NotificationCenter.default.addObserver(
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forName = UIResponder.keyboardWillShowNotification,
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object= null,
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queue= OperationQueue.main,
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using = (notification:Notification)=>{
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if(notification==null) return;
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let keyboardFrame = notification.userInfo?.get(UIResponder.keyboardFrameEndUserInfoKey) as CGRect|null
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if(keyboardFrame==null) return;
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const keyGrect = keyboardFrame! as CGRect;
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let keyboardheight = keyGrect.height
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// 计算实际键盘高度（减去安全区域）
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let actualKeyboardHeight = Math.max(0, Number(keyboardheight) - uni.getWindowInfo().safeAreaInsets.bottom)
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// 只有当高度变化时才回调
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if(actualKeyboardHeight != lastHeight) {
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lastHeight = actualKeyboardHeight
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DispatchQueue.main.async(execute = () : void => {
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callback(actualKeyboardHeight)
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})
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}
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}
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)
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const hideObserver = NotificationCenter.default.addObserver(
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forName = UIResponder.keyboardWillHideNotification,
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object= null,
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queue= OperationQueue.main,
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using = (_:Foundation.Notification)=>{
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if(lastHeight != 0) {
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lastHeight = 0
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DispatchQueue.main.async(execute = () : void => {
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callback(0)
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})
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}
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}
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)
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const cancel = ()=>{
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NotificationCenter.default.removeObserver(showObserver)
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NotificationCenter.default.removeObserver(hideObserver)
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};
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return cancel
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} |