斯威夫特：ScrollRectToVisible不工作

Question

尝试了最贴在这里的解决方案后，我仍然有麻烦移动文本框来显示键盘上方的滚动视图。

这是我的链接从解决方案＃1如下：Link 1 Link 2 Link 3

我工作具有键盘落后1场，当它显示了一个注册屏幕上。

这里是我的代码：

class SignUpViewController: UIViewController, UITextFieldDelegate, UIScrollViewDelegate, UIPopoverPresentationControllerDelegate {

@IBOutlet var firstNameTextField: UITextField!
@IBOutlet var lastNameTextField: UITextField!
@IBOutlet var phoneNumberTextField: UITextField!
@IBOutlet var emailTextField: UITextField!
@IBOutlet var submitButton: UIButton!
@IBOutlet var professionButton: UIButton!

var scrollView: UIScrollView?
var activeTextField:UITextField? = UITextField()

override func viewDidLoad() {
    super.viewDidLoad()

    let notificationCenter = NSNotificationCenter.defaultCenter()

    notificationCenter.addObserver(self, selector: #selector(SignUpViewController.keyboardWasShown(_:)), name: UIKeyboardWillShowNotification, object: nil)
    notificationCenter.addObserver(self, selector: #selector(SignUpViewController.keyboardWillBeHidden(_:)), name: UIKeyboardWillHideNotification, object: nil)
    scrollView = UIScrollView(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height))
    scrollView!.contentSize = CGSizeMake(self.view.frame.width, self.view.frame.height)

    defaultSettings()
}

func defaultSettings() {
    self.firstNameTextField.delegate = self
    self.lastNameTextField.delegate = self
    self.emailTextField.delegate = self
    self.phoneNumberTextField.delegate = self
}

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)
{
    //Need to calculate keyboard exact size due to Apple suggestions
    //self.scrollView!.scrollEnabled = true
    var info : NSDictionary = notification.userInfo!
    var keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue().size
    var 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 (!CGRectContainsPoint(aRect, activeTextField!.frame.origin))
    {
//            print(activeTextField?.frame)
//            var scrollPoint = CGPointMake(0.0, activeTextField!.frame.origin.y - (keyboardSize!.height-15))
        self.scrollView!.scrollRectToVisible((activeTextField?.frame)!, animated: true)
        //self.scrollView?.setContentOffset(scrollPoint, animated: true)
    }
}


func keyboardWillBeHidden(notification: NSNotification)
{
    //Once keyboard disappears, restore original positions
    //var info : NSDictionary = notification.userInfo!
    //var keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue().size
    var contentInsets : UIEdgeInsets = UIEdgeInsetsZero
    self.scrollView!.contentInset = contentInsets
    self.scrollView!.scrollIndicatorInsets = contentInsets
//        self.view.endEditing(true)
//        self.scrollView!.scrollEnabled = false

}

func textFieldDidBeginEditing(textField: UITextField)
{
    activeTextField = textField
}

func textFieldDidEndEditing(textField: UITextField)
{
    activeTextField = nil
}

正如你所看到的，我已经试过scrollRectToVisible与框架和setContentOffset与点。两人都没有工作。尽管代码在emailTextField挑选权作为隐藏文本框。

Answer 1

我也用同样的问题做斗争，你这样做，我不知道，如果你是成功的，找到解决办法，但我终于用setContentOffset函数，而不是scrollRectToVisible和它的工作。

斯威夫特3.X例如：

if (!aRect.contains(activeTextView!.frame.origin)) {
                self.scrollView.setContentOffset(CGPoint(x:0, y:self.activeTextView!.frame.origin.y), animated: true)
}

Answer 2

你也应该设置了滚动委托为：

self.scrollView.delegate = self as! UIScrollViewDelegate

滚动型的委托方法有这方面的工作。

Answer 3

SWIFT 4试试这个

scrollView.scrollRectToVisible(myElementView.frame, animated: true)

其中myElementView可以是任何元件