使用iOS SDK：
我有一个带UITextFields的UIView，可以启动键盘。我需要它能够：
启动键盘后，允许滚动UIScrollView的内容以查看其他文本字段自动“跳转”（通过向上滚动）或缩短
我知道我需要一个UIScrollView。我已经尝试将UIView的类更改为UIScrollView，但仍然无法上下滚动文本框。
我需要UIView和UIScrollView吗？一个在另一个里面吗？
要自动滚动到活动文本字段，需要执行哪些操作？
理想情况下，尽可能多的组件设置将在Interface Builder中完成。我只想编写需要的代码。
注意：我使用的UIView（或UIScrollView）是由一个选项卡（UITabBar）启动的，它需要正常工作。
我正在添加滚动条，只为键盘出现时使用。尽管不需要它，但我觉得它提供了一个更好的界面，例如，用户可以滚动和更改文本框。
当键盘上下移动时，我可以改变UIScrollView的框架大小。我只是在使用：
-(void)textFieldDidBeginEditing:(UITextField *)textField {
//Keyboard becomes visible
scrollView.frame = CGRectMake(scrollView.frame.origin.x,
scrollView.frame.origin.y,
scrollView.frame.size.width,
scrollView.frame.size.height - 215 + 50); // Resize
}
-(void)textFieldDidEndEditing:(UITextField *)textField {
// Keyboard will hide
scrollView.frame = CGRectMake(scrollView.frame.origin.x,
scrollView.frame.origin.y,
scrollView.frame.size.width,
scrollView.frame.size.height + 215 - 50); // Resize
}
然而，这不会自动“向上移动”或将可见区域中的下部文本字段居中，这是我真正想要的。
试试这个，效果很好：
if Firstnametxt.text == "" || Passwordtxt.text == "" || emailtxt.text == ""
{
if Firstnametxt.text == ""
{
Firstnametxt!.shake(10, withDelta: 5, speed: 0.05, shakeDirection: ShakeDirection.Horizontal)
Firstnametxt.becomeFirstResponder()
}
else if Passwordtxt.text == ""
{
Passwordtxt!.shake(10, withDelta: 5, speed: 0.05, shakeDirection: ShakeDirection.Horizontal)
Passwordtxt.becomeFirstResponder()
}
else if emailtxt.text == ""
{
emailtxt!.shake(10, withDelta: 5, speed: 0.05, shakeDirection: ShakeDirection.Horizontal)
emailtxt.becomeFirstResponder()
}
}
else
{
let isValidEmail:Bool = self.isValidEmail(emailtxt.text!)
if isValidEmail == true
{
}
else
{
emailtxt!.shake(10, withDelta: 5, speed: 0.05, shakeDirection: ShakeDirection.Horizontal)
emailtxt.becomeFirstResponder()
}
}
这是我的“仅UITextView扩展”解决方案，基于Paul Hudson@twostraws的解决方案（向他和这里所有类似答案的作者致敬）。
import UIKit
extension UITextView {
func adjustableForKeyboard() {
let notificationCenter = NotificationCenter.default
notificationCenter.addObserver(self, selector: #selector(adjustForKeyboard), name: UIResponder.keyboardWillHideNotification, object: nil)
notificationCenter.addObserver(self, selector: #selector(adjustForKeyboard), name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
}
@objc private func adjustForKeyboard(notification: Notification) {
guard let keyboardValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else {
return
}
let keyboardScreenEndFrame = keyboardValue.cgRectValue
let keyboardViewEndFrame = convert(keyboardScreenEndFrame, from: window)
if notification.name == UIResponder.keyboardWillHideNotification {
contentInset = .zero
} else {
contentInset = UIEdgeInsets(top: 0, left: 0, bottom: keyboardViewEndFrame.height - safeAreaInsets.bottom, right: 0)
}
scrollIndicatorInsets = contentInset
scrollRangeToVisible(selectedRange)
}
}
用法：
override func viewDidLoad() {
super.viewDidLoad()
textView.adjustableForKeyboard()
}
斯威夫特4。
您可以使用带有动画的UIKeyBoard轻松上下移动UITextField或UIView
import UIKit
class ViewController: UIViewController, UITextFieldDelegate {
@IBOutlet var textField: UITextField!
@IBOutlet var chatView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange), name: .UIKeyboardWillChangeFrame, object: nil)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
textField.resignFirstResponder()
}
@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
print("deltaY",deltaY)
UIView.animateKeyframes(withDuration: duration, delay: 0.0, options: UIViewKeyframeAnimationOptions(rawValue: curve), animations: {
self.chatView.frame.origin.y+=deltaY // Here You Can Change UIView To UITextField
},completion: nil)
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
}
