在 UIScrollView 中关闭 UITextField 小数点键盘

Question

我正在寻找问题的解决方案，但我发现的所有建议都不起作用。

我从一个基于两个 TextField 和小数位的工作解决方案开始。要在任何地方点击时关闭键盘，考虑到我没有 return 键，我成功使用了：

view.endEditing(true)

当我决定添加 UIScrollView 以便向上移动屏幕底部的 UITextField 时，我的问题就出现了。

view.endEditing(true) 不起作用，因为滚动视图覆盖了视图。我添加了一个 TapGestureRecognizer，除键盘关闭外，一切正常。

在 TapGestureReconizer 函数下，如果我在 activeTextFiled 上使用 resignFirstResponder，应用程序崩溃将转到 AppDelegate，错误为：

Thread 1: signal SIGABRT.

class ViewController: UIViewController, UITextFieldDelegate {

    var activeField: UITextField?

    @IBOutlet weak var textFieldTop: UITextField!
    @IBOutlet weak var textFieldBottom: UITextField!
    @IBOutlet weak var scrollView: UIScrollView!

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

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

    func registerForKeyboardNotifications() {
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWasShown:", name: UIKeyboardWillShowNotification, object: nil)
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillBeHidden", name: UIKeyboardWillHideNotification, object: nil)
    }

    func deregisterFromKeyBoardNotification() {
        NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
        NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
    }

    func keyboardWasShown(notification: NSNotification) {
        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 + 20, 0.0)

        self.scrollView.contentInset = contentInsets
        self.scrollView.scrollIndicatorInsets = contentInsets

        var aRect : CGRect = self.view.frame
        aRect.size.height -= keyboardSize!.height
        if let _ = activeField
        {
            if (!CGRectContainsPoint(aRect, activeField!.frame.origin))
            {
                self.scrollView.scrollRectToVisible(activeField!.frame, animated: true)
            }
        }
        self.scrollView.scrollEnabled = false
    }

    func keyboardWillBeHidden(notification: NSNotification)
    {
        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
        self.scrollView.scrollEnabled = false
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        registerForKeyboardNotifications()
        self.textFieldBottom.delegate = self
        self.textFieldTop.delegate = self

        scrollView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: "closeKeyboard"))

    }

    func closeKeyboard() {
        activeField?.resignFirstResponder()

    }
}

我尝试了不同的解决方案，但 none 的解决方案有效。

Answer 1

我仍在寻找 code/storyboard 中的某些代表或其他可能遗漏的部分，但花了额外的时间检查我发现了问题。

NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillBeHidden:", name: UIKeyboardWillHideNotification, object: nil)

我在原代码中忘记了 "keyboardWillBeHidden:" 末尾的“：”。这是抛出一个异常，因为这个函数有一个参数。

现在一切正常

在 UIScrollView 中关闭 UITextField 小数点键盘

Dismiss UITextField decimal pad keyboard in UIScrollView

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