Question

我的需求：

根据键盘覆盖的textField以及覆盖的内容来移动UIView。
不想使用scrollView重建它。

实现1.我必须知道我选择的textField的坐标Y.很多使用NSNotificationCenter构建侦听器的答案。有什么我不明白，为什么设置为对象？是不是触发下面功能的对象？我试图获得对象的位置但失败了。因为我将nil设置为object。尝试将textField设置为对象仍无法正常工作。

NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ViewController.keyboardWillShow), name: UIKeyboardWillShowNotification, object: UITextField())

NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ViewController.keyboardWillHide), name: UIKeyboardWillHideNotification, object: UITextField())

如何获取所选textField的位置？如果不宣布这样的事情：

@IBOutlet var textField: UITextField!

通知中是否有隐藏信息？也许在userInfo？因为键盘的高度就在其中。

let keyboardFrame = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue()

这是我的代码：

import UIKit

class VC_Base: UIViewController, UITextFieldDelegate{

    var keyBoardShow:Bool = false

    override func viewDidLoad() {
        super.viewDidLoad()

        NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(VC_Base.keyboardWillShow), name: UIKeyboardWillShowNotification, object: self)

        NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(VC_Base.keyboardWillHide), name: UIKeyboardWillHideNotification, object: self)
        // Do any additional setup after loading the view.
    }
    func keyboardWillShow(notification: NSNotification) {
        guard keyBoardShow else{
            adjustingHightLight(true, notification: notification)
            keyBoardShow = true
            return
        }
        keyBoardShow = true
    }

    func keyboardWillHide(notification: NSNotification) {
        adjustingHightLight(false, notification: notification)
        keyBoardShow = false
    }

    func adjustingHightLight(show: Bool, notification: NSNotification) {
        var userInfo = notification.userInfo!
        if let object = notification.object as! UITextField!{
            print("there is object")
            let textFieldCoverByKeyBoard = self.view.frame.maxY - object.frame.maxY
            let keyboardFrame: CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue()
            let differenceOfTextFieldAndKeyBoard = textFieldCoverByKeyBoard - keyboardFrame.height
            let animationDuration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as! NSTimeInterval
            let changeInHeight = differenceOfTextFieldAndKeyBoard * (show ? 1 : -1)
            if differenceOfTextFieldAndKeyBoard < 5{
                UIView.animateWithDuration(animationDuration, delay: 0, usingSpringWithDamping: 0, initialSpringVelocity: 0, options: UIViewAnimationOptions.CurveLinear, animations: { () -> Void in
                    self.view.frame.offsetInPlace(dx: 0, dy: changeInHeight)}, completion: nil)
            }
        }
    }

    func textFieldShouldReturn(textField: UITextField) -> Bool {
        self.view.endEditing(true)
        return true
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        self.view.endEditing(true)
    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

    }
}

1.键盘是否覆盖textField？

如果为true，它覆盖多少并向上移动UIView值，键盘将无法覆盖它。如果是假，不做任何事情并显示键盘。

2.如果我已选择一个textField，然后选择另一个。它不会再次上升（这将在某些答案中发生）。

但似乎除了使用scrollView（我不想重建......）之外没有太多的答案实现它。

请帮助!! THX。

如何在键盘存在时使UITextField向上移动而不使用滚动视图而不是以恒定值移动？

0 个答案: