Swift:仅在键盘隐藏TextField或Button时滚动查看 [英] Swift: Scroll View only when a TextField or Button is hidden by the Keyboard
问题描述
下面是我试图使用的代码,只有在键盘隐藏了聚焦的textField或UIButton时才能滚动视图:
import UIKit
class ViewController:UIViewController,UITextFieldDelegate {
@IBOutlet weak var buttonToBottomConstraint:NSLayoutConstraint!
@IBOutlet weak var textFieldUsername:UITextField!
@IBOutlet weak var textFieldPassword:UITextField!
@IBOutlet弱var scrollView:UIScrollView!
覆盖func viewDidLoad(){
super.viewDidLoad()
NSNotificationCenter.defaultCenter()。addObserver(self,selector:keyboardWillBeHidden: ,name:UIKeyboardWillHideNotification,object:nil)
NSNotificationCenter.defaultCenter()。addObserver(self,selector:keyboardWillBeShown:,name:UIKeyboardWillShowNotification,object:nil)
}
func textFieldDidBeginEditing(textField:UITextField){
}
func textFieldShouldReturn(textField:UITextField) - > Bool {textField.resignFirstResponder()
返回true
}
func keyboardWillBeHidden(通知:NSNotification){
self.scrollView。 setContentOffset(CGPointMake(0,0),animated:true)
}
func keyboardWillBeShown(通知:NSNotification){
let userInfo = notification.userInfo!
如果让kbsize = userInfo [UIKeyboardFrameBeginUserInfoKey] ?. CGRectValue()。size {
self.scrollView .setContentOffset(CGPointMake(0,kbsize.or),animated:true )
}
}
}
问题:视图滚动即使键盘没有隐藏任何东西。
启动时查看:
点击TextField时查看:
问题:如何检查键盘是否隐藏了聚焦区域,如果是,请将其推到上方?
项目:
var currentTextField:UITextField?
@IBOutlet weak var textFieldUsername:UITextField!
@IBOutlet weak var textFieldPassword:UITextField!
@IBOutlet弱var scrollView:UIScrollView!
覆盖func viewDidLoad()
{
super.viewDidLoad()
NSNotificationCenter.defaultCenter()。addObserver(self,selector :keyboardWillBeHidden:,name:UIKeyboardWillHideNotification,object:nil)
NSNotificationCenter.defaultCenter()。addObserver(self,selector:keyboardWillBeShown:,name:UIKeyboardWillShowNotification,object:nil)
}
func textFieldDidBeginEditing(textField:UITextField)
{
currentTextField = textField;
}
func textFieldShouldReturn(textField:UITextField) - > Bool {
textField.resignFirstResponder()
返回true
}
func keyboardWillBeHidden(通知:NSNotification){
currentTextField = nil;
self.scrollView.setContentOffset(CGPointMake(0,0),animated:true)
}
func keyboardWillBeShown(通知:NSNotification){
让userInfo = notification.userInfo!
如果让kbsize = userInfo [UIKeyboardFrameBeginUserInfoKey] ?. CGRectValue()。size
{
let contentInsets = UIEdgeInsets(top:0,left:0,bottom:kbsize.height ,右:0)
让screenSize:CGRect = UIScreen.mainScreen()。bounds
让screenHeight = screenSize.height
let height:CGFloat = screenHeight-(kbsize.height) - (currentTextField !.frame.size.width)
if(currentTextField!.frame.origin.y> = height)
{
var scrollPoint:CGPoint = CGPointMake(0.0,currentTextField! .frame.origin.y - (kbsize.height));
self.scrollView .setContentOffset(scrollPoint,animated:true)
}
}
}
func textFieldDidEndEditing(textField:UITextField) {
currentTextField = nil;
}
Below is the code that I'm trying to use to have the view scroll only when the focused textField or UIButton is hidden by the keyboard:
import UIKit
class ViewController: UIViewController, UITextFieldDelegate {
@IBOutlet weak var buttonToBottomConstraint: NSLayoutConstraint!
@IBOutlet weak var textFieldUsername: UITextField!
@IBOutlet weak var textFieldPassword: UITextField!
@IBOutlet weak var scrollView: UIScrollView!
override func viewDidLoad() {
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self, selector:"keyboardWillBeHidden:", name: UIKeyboardWillHideNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector:"keyboardWillBeShown:", name: UIKeyboardWillShowNotification, object: nil)
}
func textFieldDidBeginEditing(textField: UITextField) {
}
func textFieldShouldReturn(textField: UITextField) -> Bool {textField.resignFirstResponder()
return true
}
func keyboardWillBeHidden(notification: NSNotification){
self.scrollView.setContentOffset(CGPointMake(0, 0), animated: true)
}
func keyboardWillBeShown(notification: NSNotification){
let userInfo = notification.userInfo!
if let kbsize = userInfo[UIKeyboardFrameBeginUserInfoKey]?.CGRectValue().size{
self.scrollView .setContentOffset(CGPointMake(0, kbsize.or), animated: true)
}
}
}
Problem: The View scrolls even when the keyboard is not hiding anything.
View at Launch:
View Upon Tapping on a TextField:
Question: How do I check to see if the focused field is hidden by the keyboard, and ONLY if it is, push it above it?
Project: TextFieldScroll
EDIT
App works fine in Portrait mode, however, not in landscape mode. Also in landscape mode, when the Username textField keyboard is up and I tap the Password textField, it remains hidden behind the keyboard. I updated the project on Github and fixed the link. Thanks
Screen shot in landscape:
var currentTextField:UITextField?
@IBOutlet weak var textFieldUsername: UITextField!
@IBOutlet weak var textFieldPassword: UITextField!
@IBOutlet weak var scrollView: UIScrollView!
override func viewDidLoad()
{
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self, selector:"keyboardWillBeHidden:", name: UIKeyboardWillHideNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector:"keyboardWillBeShown:", name: UIKeyboardWillShowNotification, object: nil)
}
func textFieldDidBeginEditing(textField: UITextField)
{
currentTextField=textField;
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
func keyboardWillBeHidden(notification: NSNotification){
currentTextField=nil;
self.scrollView.setContentOffset(CGPointMake(0, 0), animated: true)
}
func keyboardWillBeShown(notification: NSNotification){
let userInfo = notification.userInfo!
if let kbsize = userInfo[UIKeyboardFrameBeginUserInfoKey]?.CGRectValue().size
{
let contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: kbsize.height, right: 0)
let screenSize: CGRect = UIScreen.mainScreen().bounds
let screenHeight = screenSize.height
let height:CGFloat=screenHeight-(kbsize.height)-(currentTextField!.frame.size.width)
if(currentTextField!.frame.origin.y>=height )
{
var scrollPoint: CGPoint = CGPointMake(0.0, currentTextField!.frame.origin.y - (kbsize.height));
self.scrollView .setContentOffset(scrollPoint, animated: true)
}
}
}
func textFieldDidEndEditing(textField: UITextField) {
currentTextField=nil;
}
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