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。
添加我的5美分：）
我总是喜欢使用tableView作为inputTextField或scrollView。结合通知，您可以轻松管理此类行为。（注意，如果您在tableView中使用静态单元格，则这种行为将自动为您管理。）
// MARK: - Notifications
fileprivate func registerNotificaitions() {
NotificationCenter.default.addObserver(self, selector: #selector(AddRemoteControlViewController.keyboardWillAppear(_:)),
name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(AddRemoteControlViewController.keyboardWillDisappear),
name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
fileprivate func unregisterNotifications() {
NotificationCenter.default.removeObserver(self)
}
@objc fileprivate func keyboardWillAppear(_ notification: Notification) {
if let keyboardHeight = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue.height {
view.layoutIfNeeded()
UIView.animate(withDuration: 0.3, animations: {
let heightInset = keyboardHeight - self.addDeviceButton.frame.height
self.tableView.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: heightInset, right: 0)
self.view.layoutIfNeeded()
}, completion: nil)
}
}
@objc fileprivate func keyboardWillDisappear() {
view.layoutIfNeeded()
UIView.animate(withDuration: 0.3, animations: {
self.tableView.contentInset = UIEdgeInsets.zero
self.view.layoutIfNeeded()
}, completion: nil)
}
我们可以为Swift 4.1提供用户给定的代码
let keyBoardSize = 80.0
func keyboardWillShow() {
if view.frame.origin.y >= 0 {
viewMovedUp = true
}
else if view.frame.origin.y < 0 {
viewMovedUp = false
}
}
func keyboardWillHide() {
if view.frame.origin.y >= 0 {
viewMovedUp = true
}
else if view.frame.origin.y < 0 {
viewMovedUp = false
}
}
func textFieldDidBeginEditing(_ textField: UITextField) {
if sender.isEqual(mailTf) {
//move the main view, so that the keyboard does not hide it.
if view.frame.origin.y >= 0 {
viewMovedUp = true
}
}
}
func setViewMovedUp(_ movedUp: Bool) {
UIView.beginAnimations(nil, context: nil)
UIView.setAnimationDuration(0.3)
// if you want to slide up the view
let rect: CGRect = view.frame
if movedUp {
rect.origin.y -= keyBoardSize
rect.size.height += keyBoardSize
}
else {
// revert back to the normal state.
rect.origin.y += keyBoardSize
rect.size.height -= keyBoardSize
}
view.frame = rect
UIView.commitAnimations()
}
func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
NotificationCenter.default.addObserver(self, selector:#selector(self.keyboardWillShow), name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector:#selector(self.keyboardWillHide), name: .UIKeyboardWillHide, object: nil)
}
func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
NotificationCenter.default.removeObserver(self, name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.removeObserver(self, name: .UIKeyboardWillHide, object: nil)
}
实际上，最好只使用苹果的实现，正如文档中所提供的那样。然而，他们提供的代码是错误的。将keyboardWasShow:注释下方的部分替换为以下内容：
NSDictionary* info = [aNotification userInfo];
CGRect keyPadFrame=[[UIApplication sharedApplication].keyWindow convertRect:[[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue] fromView:self.view];
CGSize kbSize =keyPadFrame.size;
CGRect activeRect=[self.view convertRect:activeField.frame fromView:activeField.superview];
CGRect aRect = self.view.bounds;
aRect.size.height -= (kbSize.height);
CGPoint origin = activeRect.origin;
origin.y -= backScrollView.contentOffset.y;
if (!CGRectContainsPoint(aRect, origin)) {
CGPoint scrollPoint = CGPointMake(0.0,CGRectGetMaxY(activeRect)-(aRect.size.height));
[backScrollView setContentOffset:scrollPoint animated:YES];
}
苹果代码存在以下问题：（1） 他们总是计算该点是否在视图的框架内，但它是一个ScrollView，因此它可能已经滚动，您需要考虑该偏移：
origin.y -= scrollView.contentOffset.y
（2） 他们按键盘的高度移动contentOffset，但我们希望相反（我们希望按屏幕上可见的高度而不是不可见的高度移动contentOffset）：
activeField.frame.origin.y-(aRect.size.height)
从以下链接下载TPKeyBoardAvoiding：https://github.com/michaeltyson/TPKeyboardAvoiding. 展开zipped文件夹，找到TPKeyboardAvoiding文件夹。选择所有.h和.m文件，并将其放到项目中。确保选中了复制项（如果需要）。将UIScrollView拖放到StoryBoard并与TPKeyboardAvoidingScrollView关联。现在，您可以在滚动视图的顶部添加UI元素。注意，即使在拖动scrollView之后，这个类也会检测UI元素的触摸。
在ViewController上：
@IBOutlet weak var usernameTextfield: UITextField!
@IBOutlet weak var passwordTextfield: UITextField!
@IBOutlet weak var loginScrollView: UIScrollView!
override func viewWillAppear(animated: Bool) {
loginScrollView.scrollEnabled = false
}
添加TextField委托。
//MARK:- TEXTFIELD METHODS
func textFieldShouldReturn(textField: UITextField) -> Bool
{
if (usernameTextfield.resignFirstResponder())
{
passwordTextfield.becomeFirstResponder()
}
textField.resignFirstResponder();
loginScrollView!.setContentOffset(CGPoint.zero, animated: true);
loginScrollView.scrollEnabled = false
return true
}
func textFieldDidBeginEditing(textField: UITextField)
{
loginScrollView.scrollEnabled = true
if (textField.tag == 1 && (device == "iPhone" || device == "iPhone Simulator" || device == "iPod touch"))
{
let scrollPoint:CGPoint = CGPointMake(0, passwordTextfield.frame.origin.y/6.4);
loginScrollView!.setContentOffset(scrollPoint, animated: true);
}
else if (textField.tag == 2 && (device == "iPhone" || device == "iPhone Simulator" || device == "iPod touch"))
{
let scrollPoint:CGPoint = CGPointMake(0, passwordTextfield.frame.origin.y/6.0);
loginScrollView!.setContentOffset(scrollPoint, animated: true);
}
}
func textFieldDidEndEditing(textField: UITextField)
{
loginScrollView!.setContentOffset(CGPointZero,animated: true);
}
