Swift 键盘出现到文本字段移动无法正常工作答案

【问题标题】：Swift keyboard appear to textfield move not working properlySwift 键盘出现到文本字段移动无法正常工作
【发布时间】：2018-08-25 13:26:15
【问题描述】：

我试图在键盘出现时创建相应的文本字段应该移动到键盘顶部，这里有两件事我需要解决，在编辑时间文本字段到起点时，我还需要在子类中使用下面的代码，因为想要得到由多个其他类文本字段引用。

这里，在我的代码下面

extension UIView {

    func bindToKeyboard(){
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
    }

    func unbindFromKeyboard(){
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
    }

    @objc
    func keyboardWillChange(notification: NSNotification) {

        guard let userInfo = notification.userInfo else { return }

        let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as! Double
        let curve = userInfo[UIKeyboardAnimationCurveUserInfoKey] as! UInt
        let curFrame = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
        let targetFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
        let deltaY = targetFrame.origin.y - curFrame.origin.y

        UIView.animateKeyframes(withDuration: duration, delay: 0.0, options: UIViewKeyframeAnimationOptions(rawValue: curve), animations: {
            self.frame.origin.y += deltaY
        })
    }
}

在 Viewdidload 中

baseview.bindToKeyboard()

文本字段应该返回

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

【问题讨论】：

标签： ios swift

【解决方案1】：

你可以考虑使用这个框架，它会帮助你很多努力：
https://github.com/hackiftekhar/IQKeyboardManager

import IQKeyboardManagerSwift

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

      IQKeyboardManager.shared.enable = true

      return true
    }
}

【讨论】：

兄弟，我需要一些代码，这样我才能理解更多......@koingDev

【解决方案2】：

完美运行。试试这个

// Start Editing The Text Field
func textFieldDidBeginEditing(_ textField: UITextField) {
    moveTextField(textField, moveDistance: -100, up: true)
}

// Finish Editing The Text Field
func textFieldDidEndEditing(_ textField: UITextField) {
    moveTextField(textField, moveDistance: -100, up: false)
}

// Hide the keyboard when the return key pressed
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    textField.resignFirstResponder()
    return true
}

// Move the text field in a pretty animation!
func moveTextField(_ textField: UITextField, moveDistance: Int, up: Bool) {
    let moveDuration = 0.3
    let movement: CGFloat = CGFloat(up ? moveDistance : -moveDistance)

    UIView.beginAnimations("animateTextField", context: nil)
    UIView.setAnimationBeginsFromCurrentState(true)
    UIView.setAnimationDuration(moveDuration)
    self.view.frame = self.view.frame.offsetBy(dx: 0, dy: movement)
    UIView.commitAnimations()
}

【讨论】：