使用Swift使用鍵盤移動視圖我有一個應用程序，在視圖的下半部分有一個文本字段。這意味著當我輸入文本字段時鍵盤覆蓋文本字段。如何在打字時向上移動視圖以便我可以看到我正在鍵入的內容，然后在鍵盤消失時將其移回原來的位置？我到處都看，但所有解決方案似乎都在Obj-C中，我還沒有完全轉換。任何幫助將不勝感激。
3 回答
慕少森
TA貢獻2019條經驗 獲得超9個贊
這是一個解決方案，無需處理從一個textField到另一個textField的切換：
override func viewDidLoad() {
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil)
} func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
self.view.frame.origin.y -= keyboardSize.height } }func keyboardWillHide(notification: NSNotification) {
self.view.frame.origin.y = 0}要解決此問題，請keyboardWillShow/Hide使用以下代碼替換這兩個函數：
func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
if view.frame.origin.y == 0 {
self.view.frame.origin.y -= keyboardSize.height }
} }func keyboardWillHide(notification: NSNotification) {
if view.frame.origin.y != 0 {
self.view.frame.origin.y = 0
}}編輯SWIFT 3.0：
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil) }@objc func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
if self.view.frame.origin.y == 0 {
self.view.frame.origin.y -= keyboardSize.height }
} }@objc func keyboardWillHide(notification: NSNotification) {
if self.view.frame.origin.y != 0 {
self.view.frame.origin.y = 0
}}編輯SWIFT 4.0：
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil) }@objc func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
if self.view.frame.origin.y == 0 {
self.view.frame.origin.y -= keyboardSize.height }
} }@objc func keyboardWillHide(notification: NSNotification) {
if self.view.frame.origin.y != 0 {
self.view.frame.origin.y = 0
}}編輯SWIFT 4.2：
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)}@objc func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
if self.view.frame.origin.y == 0 {
self.view.frame.origin.y -= keyboardSize.height }
}}@objc func keyboardWillHide(notification: NSNotification) {
if self.view.frame.origin.y != 0 {
self.view.frame.origin.y = 0
}}
藍山帝景
TA貢獻1843條經驗 獲得超7個贊
最簡單的方法，甚至不需要任何代碼：
如果您還沒有使用Spring動畫框架，請下載KeyboardLayoutConstraint.swift并將文件添加（拖放）到您的項目中。
在故事板中，為視圖或文本字段創建底部約束，選擇約束（雙擊它），然后在Identity Inspector中，將其類從NSLayoutConstraint更改為KeyboardLayoutConstraint。
完成！
該對象將與鍵盤同步自動向上移動。
動漫人物
TA貢獻1815條經驗 獲得超10個贊
此線程上的一個流行答案使用以下代碼：
func keyboardWillShow(sender: NSNotification) {
self.view.frame.origin.y -= 150}func keyboardWillHide(sender: NSNotification) {
self.view.frame.origin.y += 150}將靜態量偏移視圖存在明顯問題。它在一臺設備上看起來不錯，但在任何其他尺寸配置上看起來都很糟糕。您需要獲得鍵盤高度并將其用作偏移值。
這是一個適用于所有設備的解決方案，可以處理用戶在鍵入時隱藏預測文本字段的邊緣情況。
解
需要注意的是，我們將self.view.window作為對象參數傳遞。這將為我們提供鍵盤數據，例如它的高度！
@IBOutlet weak var messageField: UITextField!override func viewDidLoad() {
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name:UIKeyboardWillShowNotification, object: self.view.window)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name:UIKeyboardWillHideNotification, object: self.view.window)}func keyboardWillHide(sender: NSNotification) {
let userInfo: [NSObject : AnyObject] = sender.userInfo!
let keyboardSize: CGSize = userInfo[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue.size self.view.frame.origin.y += keyboardSize.height}我們將使它在所有設備上看起來都很漂亮，并處理用戶添加或刪除預測文本字段的情況。
func keyboardWillShow(sender: NSNotification) {
let userInfo: [NSObject : AnyObject] = sender.userInfo!
let keyboardSize: CGSize = userInfo[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue.size let offset: CGSize = userInfo[UIKeyboardFrameEndUserInfoKey]!.CGRectValue.size if keyboardSize.height == offset.height {
UIView.animateWithDuration(0.1, animations: { () -> Void in
self.view.frame.origin.y -= keyboardSize.height })
} else {
UIView.animateWithDuration(0.1, animations: { () -> Void in
self.view.frame.origin.y += keyboardSize.height - offset.height })
}}刪除觀察員
在離開視圖之前不要忘記刪除觀察者，以防止傳輸不必要的消息。
override func viewWillDisappear(animated: Bool) {
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: self.view.window)
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: self.view.window)}根據評論中的問題進行更新：
如果您有兩個或更多文本字段，則可以檢查view.frame.origin.y是否為零。
func keyboardWillShow(sender: NSNotification) {
let userInfo: [NSObject : AnyObject] = sender.userInfo!
let keyboardSize: CGSize = userInfo[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue.size let offset: CGSize = userInfo[UIKeyboardFrameEndUserInfoKey]!.CGRectValue.size if keyboardSize.height == offset.height {
if self.view.frame.origin.y == 0 {
UIView.animateWithDuration(0.1, animations: { () -> Void in
self.view.frame.origin.y -= keyboardSize.height })
}
} else {
UIView.animateWithDuration(0.1, animations: { () -> Void in
self.view.frame.origin.y += keyboardSize.height - offset.height })
}
print(self.view.frame.origin.y)}- 3 回答
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