[英]How to resize ScrollView when keyboard appears?
我正在嘗試創建此發布功能,該功能將允許您插入文本和圖像(類似於iOS設備上的Note應用)。 但是,當我在淺灰色區域(這是一個文本視圖字段)上按鍵盤時,我不知道如何移動或調整ScrollView的大小,因此灰色區域將調整大小,並且添加按鈕將移動到鍵盤出現時。
// PostViewController.swift
//
// Created by Martynas on 09/12/2016.
// Copyright © 2016 Martynas. All rights reserved.
//
import UIKit
import Firebase
class PostViewController: UIViewController, UITextFieldDelegate {
@IBOutlet var ScrollView: UIScrollView!
@IBOutlet var titleTextField: UITextField!
@IBOutlet var contentTextField: UITextView!
@IBOutlet var Menu: UIView!
@IBAction func hideKeyboardWhenSwippedDown(_ sender: Any) {
contentTextField.endEditing(true)
}
override func viewDidLoad() {
super.viewDidLoad()
// Hide keyboard when...
self.hideKeyboardWhenTappedAround() // ...press anywhere outside the keyboard
self.titleTextField.delegate = self
self.contentTextField.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func sendTapped(_ sender: Any) {
if let uid = FIRAuth.auth()?.currentUser?.uid {
if let title = titleTextField.text {
if let content = contentTextField.text {
let postObject: Dictionary<String, Any> = [
"uid": uid,
"title": title,
"content": content
]
FIRDatabase.database().reference().child("posts").childByAutoId().setValue(postObject)
}
}
}
}
@IBAction func addTapped(_ sender: Any) {
}
func textFieldDidBeginEditing(_ textField: UITextField) {
if textField == contentTextField {
ScrollView.setContentOffset(CGPoint(x: 0, y: 0), animated: true)
} else {
return
}
}
func textFieldDidEndEditing(_ textField: UITextField) {
if textField == contentTextField {
ScrollView.setContentOffset(CGPoint(x: 0, y: 250), animated: true)
} else {
return
}
}
// Hide keyboard when user presses 'return' key on the keyboard...
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
titleTextField.resignFirstResponder()
return true
}
}
這是控制器視圖:
您需要收聽keyboardDidShow/Hide
通知並相應地調整滾動視圖的高度。 keyboardDidShow
通知userInfo
包含鍵盤的框架以及高度。
假設滾動視圖在超級視圖的底部具有約束,則可以使其成為IBOutlet
並對其進行動畫處理,使其恆定於鍵盤的高度,並在分別觸發鍵盤顯示和隱藏通知時使其返回0。
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