目前正在学习教程,但是,某些语法已过时。基本上代码应该显示和隐藏用户键盘。我在 addObserver
方法中遇到了一些语法错误,Swift 希望我改用键路径,但是,如果我使用自动“修复它”,我会收到更多错误。谁能帮我解决这个问题?谢谢!
NSNotification.addObserver(self, selector: #selector(keyboardwillShow), name: .UIKeyboardWillShow, nil)
NSNotification.addObserver(self, selector: #selector(keyboardwillHide), name: .UIKeyboardWillHide, nil)
func keyboardwillShow(_notification:NSNotification) {
keyboard = (_notification.userInfo![UIKeyboardFrameEndUserInfoKey]! as AnyObject).cgRectValue
UIView.animate(withDuration: 0.4) {
self.scrolledView.frame.size.height = self.scrollViewHeight - self.keyboard.height
}
}
func keyboardwillHide(_notification:NSNotification) {
UIView.animate(withDuration: 0.5) {
self.scrolledView.frame.size.height = self.view.frame.height
}
}
我收到调试消息:“调用中的参数标签不正确(有 _selector:name,需要 _forKeyPath:options:context”
最佳答案
你的函数有参数,当你在观察者中添加它时缺少参数
而且你必须使用 NotificationCenter.default.addObserver
而不是 NotificationCenter.addObserver
let selectorForKeyBoardWillShow: Selector = #selector(ViewController.keyboardWillShow(_:))
let selectorForKeyBoardWillHide: Selector = #selector(ViewController.keyboardWillHide(_:))
// MARK: - Functions
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: selectorForKeyBoardWillShow, name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: selectorForKeyBoardWillHide, name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
// MARK: Keyboard Observer
func keyboardWillShow(_ notification: Notification) {
}
func keyboardWillHide(_ notification: Notification) {
}
关于ios - NSNotfication.addObserver - 更新到当前的 Swift 语法?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45285054/