我实现了一些代码，以在显示键盘时滚动屏幕，以防止覆盖字段。
这对于Text字段工作正常，但是不适用于UITextView字段。
这是我实现的代码：
func textFieldDidBeginEditing(textField: UITextField)
{
//print("textfieldDidBeginEditing")
activeField = textField
}
func textFieldDidEndEditing(textField: UITextField)
{
//print("textfieldDidEndEditing")
activeField = nil
}
func textViewDidBeginEditing(textView: UITextView) {
print("textViewDidBeginEditing")
//print(textView)
activeTextView = textView
print("1activeTextView:\(activeTextView)")
}
func textViewDidEndEditing(textView: UITextView) {
print("textViewDidEndEditing")
//print(textView)
//print("2activeTextView:\(activeTextView)")
activeTextView = nil
}
func registerForKeyboardNotifications()
{
//Adding notifies on keyboard appearing
NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWasShown:", name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillBeHidden:", name: UIKeyboardWillHideNotification, object: nil)
}
func deregisterFromKeyboardNotifications()
{
//Removing notifies on keyboard appearing
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
}
func keyboardWasShown(notification: NSNotification)
{
print("yes")
//Need to calculate keyboard exact size due to Apple suggestions
self.scrollView.scrollEnabled = true
let info : NSDictionary = notification.userInfo!
let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue().size
let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize!.height, 0.0)
self.scrollView.contentInset = contentInsets
self.scrollView.scrollIndicatorInsets = contentInsets
var aRect : CGRect = self.view.frame
aRect.size.height = keyboardSize!.height
if (activeField != nil) {
print("KWSactivfield:\(activeField)")
if (!CGRectContainsPoint(aRect, activeField!.frame.origin))
{
print("!CGRectContainsPoint")
self.scrollView.scrollRectToVisible(activeField!.frame, animated: true)
}
}
if (activeTextView != nil) {
print("KWSactiveTextView:\(activeTextView)")
if (!CGRectContainsPoint(aRect, activeTextView!.frame.origin))
{
print("true4")
self.scrollView.scrollRectToVisible(activeTextView!.frame, animated: true)
}
}
}
func keyboardWillBeHidden(notification: NSNotification)
{
//Once keyboard disappears, restore original positions
let info : NSDictionary = notification.userInfo!
let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue().size
let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, -2*keyboardSize!.height, 0.0)
print("insets")
self.scrollView.contentInset = contentInsets
self.scrollView.scrollIndicatorInsets = contentInsets
self.view.endEditing(true)
self.scrollView.scrollEnabled = false
}
我注意到，一旦在keyboardWasShown函数中，activeTextView始终为“ nil”。
任何帮助将不胜感激，因为我似乎无法弄清楚。
谢谢！
最佳答案
我知道这是一篇旧文章，但我遇到了同样的问题，我用了一些小技巧解决了它。我在这里发布我的解决方案，这可能会对其他人有所帮助。
诀窍是为所有textviews的tag属性分配一个值，然后在我的keyboardWasShown方法中读取它，并根据此值，我知道选择了哪个textview。一些代码将帮助您了解我的所作所为：
我声明了我的textviews和一个int变量来存储所选textview的标记值：
var myTextViewField: UITextView! = nil
var anotherTextViewField: UITextView! = nil
var activeTextViewTag: Int = 0
在viewDidLoad与所有其他属性，我已经设置了我的textviews的tag属性：
myTextViewField.tag = 1
anotherTextViewField.tag = 2
现在是时候读取标签值了，我是在textViewDidBeginEditing方法中完成的
func textViewDidBeginEditing(_ textView: UITextView) {
activeTextViewTag = textView.tag
}
最后，在keyboardWasShown方法中读取activeTextViewTag值并移动scrollview
func keyboardWasShown(notification: NSNotification){
print("keyboardWasShown")
if let userInfo = notification.userInfo {
if let keyboardSize = (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
let contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: keyboardSize.height, right: 0)
scrollView.contentInset = contentInsets;
scrollView.scrollIndicatorInsets = contentInsets;
// If active text field is hidden by keyboard, scroll it so it's visible
var aRect: CGRect = self.view.frame
aRect.size.height = aRect.size.height - keyboardSize.height
var activeField: UITextView! = nil
if(activeTextViewTag == 1){
activeField = myTextViewField
} else {
activeField = anotherTextViewField
}
if(!aRect.contains(activeField.frame.origin)){
self.scrollView.scrollRectToVisible(activeField.frame, animated: true)
}
} else {
// no UIKeyboardFrameBeginUserInfoKey entry in userInfo
print("no UIKeyboardFrameBeginUserInfoKey entry in userInfo")
}
} else {
// no userInfo dictionary in notification
print("no userInfo dictionary in notification")
}
}
我直接在keyboardWasShown中检查了活动字段，但是可以用单独的方法来完成。
就这样！该解决方案非常适合我，希望对您有所帮助！
关于ios - 显示键盘时UITextView不会滚动，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/37394636/