[英]How to make scrollView scrolling only if keyboard appears in swift
I am using scrolview for view with height 1000, initially i don't want my scrolView to scroll.我正在使用 scrollview 来查看高度为 1000 的视图,最初我不希望我的 scrollView 滚动。 if i tap on any textField then i want my scrolview to scroll and if i return keyboard then i don't want my scrollview to scroll.
如果我点击任何文本字段,那么我希望我的滚动视图滚动,如果我返回键盘,那么我不希望滚动视图滚动。
Here i am able to textfield up when when keyboard appears but i am unable to return textfield to its orginal position when i return keyboard and when i return keyboard i dont want my view to scroll,在这里,当键盘出现时,我可以向上显示文本字段,但是当我返回键盘时,我无法将文本字段返回到其原始 position 并且当我返回键盘时,我不希望我的视图滚动,
Please help me in the code.请在代码中帮助我。
class ViewController: UIViewController, UITextFieldDelegate {
@IBOutlet weak var scrolView: UIScrollView!
@IBOutlet weak var upTFLD: UITextField!
var activeTextField = UITextField()
@IBOutlet weak var downTFLD: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
upTFLD.delegate = self
downTFLD.delegate = self
NotificationCenter.default.addObserver(self, selector: #selector(onKeyboardAppear(_:)), name: UIResponder.keyboardDidShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(onKeyboardDisappear(_:)), name: UIResponder.keyboardDidHideNotification, object: nil)
}
@objc func onKeyboardAppear(_ notification: NSNotification) {
let info = notification.userInfo!
let rect: CGRect = info[UIResponder.keyboardFrameBeginUserInfoKey] as! CGRect
let kbSize = rect.size
let insets = UIEdgeInsets(top: 0, left: 0, bottom: kbSize.height+20, right: 0)
self.scrolView.contentInset = insets
self.scrolView.scrollIndicatorInsets = insets
var visibleRect: CGRect = self.scrolView.convert(self.scrolView.bounds, to: self.view)
visibleRect.size.height -= rect.size.height;
let inputRect: CGRect = self.activeTextField.convert(self.activeTextField.bounds, to: self.scrolView)
if (visibleRect.contains(inputRect)) {
self.scrolView.scrollRectToVisible(inputRect, animated: true)
}
}
@objc func onKeyboardDisappear(_ notification: NSNotification) {
self.scrolView.contentInset = UIEdgeInsets.zero
self.scrolView.scrollIndicatorInsets = UIEdgeInsets.zero
}
public func textFieldDidBeginEditing(_ textField: UITextField) {
activeTextField = textField
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
activeTextField.resignFirstResponder()
return true
}
}
initially i dont want scrolling, and if i return keyboard i need textfield come to its original position and no scrolling again.最初我不想滚动,如果我返回键盘,我需要文本字段来到它原来的 position 并且不再滚动。
Only keyboard appears then only i need scrolling.只有键盘出现然后只有我需要滚动。 please help me in the code.
请在代码中帮助我。
In viewWillAppear在视图中会出现
yourScrollview.isScrollEnabled = false
After Keyboard appears make it true
键盘出现后使它成为
true
yourScrollview.isScrollEnabled = true
Alternatively you can use IQKeyboard manager to take care of textfields.Checkout: IQKeyboardManager或者,您可以使用 IQKeyboard 管理器来处理 textfields.Checkout: IQKeyboardManager
You just need to set the contentOffset of your ScrollView right after the keyboard is hidden.您只需要在键盘隐藏后立即设置 ScrollView 的 contentOffset。
Create a variable to store offsetBeforeShowKeyboard
创建一个变量来存储
offsetBeforeShowKeyboard
var offsetBeforeShowKeyboard: CGFloat?
When view is initially loaded:最初加载视图时:
self.scrollView.isScrollEnabled = false
When select any TextField:当 select 任何 TextField:
public func textFieldDidBeginEditing(_ textField: UITextField) {
self.scrollView.isScrollEnabled = true
if (self.offsetBeforeShowKeyboard == nil) {
self.offsetBeforeShowKeyboard = self.scrollView.contentOffset
}
}
When keyboard is hidden键盘隐藏时
@objc func onKeyboardDisappear(_ notification: NSNotification) {
self.scrollView.isScrollEnabled = false
if let offset = self.offsetBeforeShowKeyboard {
self.scrolView.setContentOffset(offset, animated: true)
}
self.offsetBeforeShowKeyboard = nil
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.