我有一个应用,它在视图的下半部分有一个文本框。 这意味着当我在文本框中输入时,键盘会覆盖文本框。
我如何在打字时向上移动视图,这样我就可以看到我键入的内容,然后在键盘消失时将它移回原来的位置?
我到处都看了,但所有的解似乎都在Obj-C中,我还不能完全转换。
任何帮助都将不胜感激。
我有一个应用,它在视图的下半部分有一个文本框。 这意味着当我在文本框中输入时,键盘会覆盖文本框。
我如何在打字时向上移动视图,这样我就可以看到我键入的内容,然后在键盘消失时将它移回原来的位置?
我到处都看了,但所有的解似乎都在Obj-C中,我还不能完全转换。
任何帮助都将不胜感激。
当前回答
验证的答案没有考虑到文本字段的位置,并有一些错误(双位移,永远不会回到主位置,位移即使文本字段是在视图的顶部…)
这个想法是:
获取焦点TextField的Y的绝对位置 来获取键盘高度 来获取屏幕高度 然后计算键盘位置和文本框之间的距离(如果< 0 ->向上移动视图) 使用UIView。而不是UIView.frame.origin.y -= ..,因为用UIView更容易回到原来的位置。变换= .identity
然后,我们将能够移动视图,只有在必要和特定的位移,以便有聚焦texField刚刚超过键盘
代码如下:
斯威夫特4
class ViewController: UIViewController, UITextFieldDelegate {
var textFieldRealYPosition: CGFloat = 0.0
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(VehiculeViewController.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(VehiculeViewController.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
// Delegate all textfields
}
@objc func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
let distanceBetweenTextfielAndKeyboard = self.view.frame.height - textFieldRealYPosition - keyboardSize.height
if distanceBetweenTextfielAndKeyboard < 0 {
UIView.animate(withDuration: 0.4) {
self.view.transform = CGAffineTransform(translationX: 0.0, y: distanceBetweenTextfielAndKeyboard)
}
}
}
}
@objc func keyboardWillHide(notification: NSNotification) {
UIView.animate(withDuration: 0.4) {
self.view.transform = .identity
}
}
func textFieldDidBeginEditing(_ textField: UITextField) {
textFieldRealYPosition = textField.frame.origin.y + textField.frame.height
//take in account all superviews from textfield and potential contentOffset if you are using tableview to calculate the real position
}
}
其他回答
将这个添加到你的视图控制器中。效果非常好。只是调整数值。
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name:NSNotification.Name.UIKeyboardWillShow, object: nil);
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name:NSNotification.Name.UIKeyboardWillHide, object: nil);
}
@objc func keyboardWillShow(sender: NSNotification) {
self.view.frame.origin.y -= 150
}
@objc func keyboardWillHide(sender: NSNotification) {
self.view.frame.origin.y += 150
}
func registerForKeyboardNotifications()
{
//Keyboard
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(keyboardWasShown), name: UIKeyboardDidShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(keyboardWillBeHidden), name: UIKeyboardDidHideNotification, object: nil)
}
func deregisterFromKeyboardNotifications(){
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
}
func keyboardWasShown(notification: NSNotification){
let userInfo: NSDictionary = notification.userInfo!
let keyboardInfoFrame = userInfo.objectForKey(UIKeyboardFrameEndUserInfoKey)?.CGRectValue()
let windowFrame:CGRect = (UIApplication.sharedApplication().keyWindow!.convertRect(self.view.frame, fromView:self.view))
let keyboardFrame = CGRectIntersection(windowFrame, keyboardInfoFrame!)
let coveredFrame = UIApplication.sharedApplication().keyWindow!.convertRect(keyboardFrame, toView:self.view)
let contentInsets = UIEdgeInsetsMake(0, 0, (coveredFrame.size.height), 0.0)
self.scrollViewInAddCase .contentInset = contentInsets;
self.scrollViewInAddCase.scrollIndicatorInsets = contentInsets;
self.scrollViewInAddCase.contentSize = CGSizeMake((self.scrollViewInAddCase.contentSize.width), (self.scrollViewInAddCase.contentSize.height))
}
/**
this method will fire when keyboard was hidden
- parameter notification: contains keyboard details
*/
func keyboardWillBeHidden (notification: NSNotification) {
self.scrollViewInAddCase.contentInset = UIEdgeInsetsZero
self.scrollViewInAddCase.scrollIndicatorInsets = UIEdgeInsetsZero
}
这个视频教程是最好的。7分钟长,会很有意义。这样一个简单的解决方案,当你有多个文本字段,并希望滚动视图移动“x”数量的像素时,特定的文本字段被点击。
https://youtu.be/VuiPGJOEBH4
就这些步骤:
-把你所有的文本字段放在一个滚动视图中,约束到视图的边缘。
-连接所有的文本字段和滚动视图作为视图控制器的委托。
-用IBOutlet连接所有文本字段和滚动视图。
class ViewController: UIViewController, UITextFieldDelegate {
添加UITextFieldDelegate协议到你的类中
@IBOutlet var stateAddress: UITextField!
@IBOutlet var zipAddress: UITextField!
@IBOutlet var phoneNumber: UITextField!
@IBOutlet var vetEmailAddress: UITextField!
@IBOutlet weak var scrollView: UIScrollView!
-在swift文件中添加UITextFieldDelegate方法:
func textFieldShouldReturn(textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
func textFieldDidBeginEditing(textField: UITextField) {
if (textField == self.stateAddress) {
scrollView.setContentOffset(CGPointMake(0, 25), animated: true)
}
else if (textField == self.zipAddress) {
scrollView.setContentOffset(CGPointMake(0, 57), animated: true)
}
else if (textField == self.phoneNumber) {
scrollView.setContentOffset(CGPointMake(0, 112), animated: true)
}
else if (textField == self.vetEmailAddress) {
scrollView.setContentOffset(CGPointMake(0, 142), animated: true)
}
}
func textFieldDidEndEditing(textField: UITextField) {
scrollView.setContentOffset(CGPointMake(0, 0), animated: true)
}
第一种方法只是激活键盘上的返回按钮来关闭键盘。第二个是当你点击到任何特定的文本域,然后设置你的滚动视图滚动的距离的y偏移(我的是基于我的视图控制器上的y位置25,57,112,142)。最后一个说,当你从键盘上点击时,滚动视图会回到原来的位置。
我使我的视图像素完美的这种方式!
Swift 4中的Simpelst方法
import UIKit
class ViewController: UIViewController, UITextFieldDelegate {
@IBOutlet var myTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
myTextField.resignFirstResponder()
}
func keyboardWillShow(notification: NSNotification) {
// let duration = notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey]
// print("duration",duration)
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
let keyboardHeight : Int = Int(keyboardSize.height)
print("keyboardWillShow",keyboardHeight)
if let height = UserDefaults.standard.value(forKey: "keyboardHeight") as? (Int) {
moveTextField(myTextField, moveDistance: -height as Int, moveDuration: 0.43, up: true)
}else{
UserDefaults.standard.set(keyboardHeight, forKey: "keyboardHeight")
moveTextField(myTextField, moveDistance: -keyboardHeight, moveDuration: 0.43, up: true)
}
}
}
func keyboardWillHide(notification: NSNotification){
if let height = UserDefaults.standard.value(forKey: "keyboardHeight") as? (Int) {
moveTextField(myTextField, moveDistance: -height as Int, moveDuration: 0.25, up: false)
}
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
func moveTextField(_ textField: UITextField, moveDistance: Int, moveDuration: Double, up: Bool) {
let movement: CGFloat = CGFloat(up ? moveDistance : -moveDistance)
UIView.beginAnimations("animateTextField", context: nil)
UIView.setAnimationBeginsFromCurrentState(true)
UIView.setAnimationDuration(moveDuration)
self.view.frame = self.view.frame.offsetBy(dx: 0, dy: movement)
UIView.commitAnimations()
}
}
你也可以上下移动只有UITextFiled而不是整个屏幕(UIView)。 用这种方法。
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange), name: .UIKeyboardWillChangeFrame, object: nil)
And
@objc func keyboardWillChange(notification: NSNotification) {
let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
let curve = notification.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! UInt
let curFrame = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
let targetFrame = (notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
let deltaY = targetFrame.origin.y - curFrame.origin.y
UIView.animateKeyframes(withDuration: duration, delay: 0.0, options: UIViewKeyframeAnimationOptions(rawValue: curve), animations: {
self.textField.frame.origin.y+=deltaY
},completion: nil)
}
我对初学者的两点建议: 在上面的例子中,有人改变坐标,其他人使用“自动调整蒙版”和其他约束:
正如苹果所说,不要将这三种逻辑混合在一起。 如果你在故事板中有约束,不要尝试改变x/y。这绝对行不通。