Keyboard Events for IOs in NativeScript

gistfile1.txt

// Keyboard up event on ios
if (application.ios) {
    // First Event is Catched before the Keyboard Jumps Up
    // We Save the Height of the Keyboard for the Positioning of the LayoutElement
    application.ios.addNotificationObserver(UIKeyboardWillShowNotification, (event) => {
        // console.log('WillShow', typeof event.userInfo, event.userInfo.valueForKey(UIKeyboardFrameEndUserInfoKey).CGRectValue.size.height);
        // console.log(this.textView.ios.contentSize);
        this.contentSizeStartValue = event.userInfo.valueForKey(UIKeyboardFrameEndUserInfoKey).CGRectValue.size.height + 10;
    });
    // Second Event is Catched when the Keyboard is Up to Reposition our Element
    application.ios.addNotificationObserver(UIKeyboardDidShowNotification, (event) => {
        if (this.textView) {
            this.ngZone.run(() => {
                if (this.textView.ios.contentSize.height > 100) {
                    this.textHeight = this.contentSizeStartValue + 100;
                    this.textViewHeight = 90;
                } else {
                    this.textHeight = this.textViewHeight = this.contentSizeStartValue;
                }
                this.textChanged();
                // console.log('HEIGHT ON KEYBOARD UP', this.textHeight, this.textView.ios.contentSize.height);
            });
        }
    });

    // Keyboard down event on ios to reposition our element again
    application.ios.addNotificationObserver(UIKeyboardWillHideNotification, () => {
        if (this.textView) {
            this.ngZone.run(() => {
                if (this.textView.ios.contentSize.height > 100) {
                    this.textHeight = this.textViewHeight = 100;
                } else {
                    this.textHeight = this.textViewHeight = this.textView.ios.contentSize.height - this.contentSizeStartValue;
                }
            });
        }
    });
}