angular2-nativescript - 键盘上方的 Nativescript 移动按钮

Question

如何在键盘上方移动被打开的键盘覆盖的按钮并在键盘关闭时将其带回来？

标签： angular2-nativescriptnativescript-angular

Answer 1

你可以试试：https ://gist.github.com/elvticc/0c789d08d57b1f4d9273f7d93a7083ec

// Also use IQKeyboardManager to customize the iOS keyboard
// See https://github.com/tjvantoll/nativescript-IQKeyboardManager

// let iqKeyboard: IQKeyboardManager = IQKeyboardManager.sharedManager();
// iqKeyboard.toolbarDoneBarButtonItemText             = "OK";
// iqKeyboard.canAdjustAdditionalSafeAreaInsets        = true;
// iqKeyboard.shouldFixInteractivePopGestureRecognizer = true;

// Angular
[...]
import { OnInit, OnDestroy, ElementRef, ViewChild } from "@angular/core";
[...]

// NativeScript
[...]
import { ios as iosApp } from "tns-core-modules/application/application";
[...]

@ViewChild("element") private _element: ElementRef<StackLayout>; // FlexboxLayout, GridLayout, etc.

private _keyboardHeight: number = 0;
private _elementHeight:  number = 0;
private _observerIDs:    Array<object> = new Array();

// Start events when the component is ready
ngOnInit(): void {

    // iOS keyboard events
    if (iosApp) {

        let eventNames: Array<string> = [
                UIKeyboardWillShowNotification,
                UIKeyboardDidShowNotification,
                UIKeyboardWillHideNotification
            ];

        // Catch the keyboard height before it appears
        this._observerIDs.push({
            event: eventNames[0],
            id: iosApp.addNotificationObserver(eventNames[0], (event) => {

                    let currHeight: number = this._keyboardHeight,
                        newHeight:  number = event.userInfo.valueForKey(UIKeyboardFrameEndUserInfoKey).CGRectValue.size.height;

                    if (currHeight != newHeight) {

                        this._keyboardHeight = newHeight;

                    }

                })
        });

        // Position the element according to the height of the keyboard
        this._observerIDs.push({
            event: eventNames[1],
            id: iosApp.addNotificationObserver(eventNames[1], (event) => {

                    if (this._elementHeight == 0) {

                        this._elementHeight = this._element.nativeElement.getActualSize().height;

                    }

                    this._element.nativeElement.height = this._keyboardHeight + this._elementHeight;

                })
        });

        // Reposition the element according to its starting height
        this._observerIDs.push({
            event: eventNames[2],
            id: iosApp.addNotificationObserver(eventNames[2], () => {

                    this._element.nativeElement.height = this._elementHeight; // or "auto";

                })
        });

    }

}

// Stop events to avoid a memory leak
ngOnDestroy(): void {

    if (iosApp) {

        let index: number = 0;

        for (index; index < this._observerIDs.length; index++) {

            let observerId: number = this._observerIDs[index]['id'],
                eventName:  string = this._observerIDs[index]['event'];

            iosApp.removeNotificationObserver(observerId, eventName);

        }

    }

}

Marcel Ploch 的原文：https ://gist.github.com/marcel-ploch/bf914dd62355049a0e5efb4885ca4c6e