func keyboarDWillShow(notification: Notification) {//Code moving vIEw when keyboard appears}
我正在尝试创建一个这样的选择器:
let selector = Selector(("keyboarDWillShow")NotificationCenter.default.addobserver(vIEw,selector: selector,name: .UIKeyboarDWillShow,object: anyVIEw.vIEw.window)
它正在编译,但是当键盘出现时,它会崩溃.
因为它是独立的类我不能使用这种结构:
#selector(keyboarDWillShow)
因为它将Swift函数转换为Objective-C函数(添加@objc).
所以问题是:如何用参数字符串创建一个Selector表单?
P. S.我可以将整个代码放在那里,但我不希望问题非常大,所以我会编辑问题,如果有人问…
解决方法Here is what you want,Selector with string type and Notification parameter argument
斯威夫特4
NotificationCenter.default.addobserver(self,selector: Selector(("showKeyboard:")),name:NSNotification.name.UIKeyboarDWillShow,object: nil)var keyboardHeight = 0.0//-------------------@objc func showKeyboard(_ sender: Notification) { keyboarDWillShow(sender: sender as NSNotification,adjustHeight: 150) print("sender - \(sender)")}//-------------------func keyboarDWillShow(sender: NSNotification,adjustHeight: CGfloat) { if let keyboardSize = (sender.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue { keyboardHeight = Double(keyboardSize.height) // do your calculations }}
斯威夫特3
NotificationCenter.default.addobserver(vIEw,selector: Selector(("keyboarDWillShow:")),object: anyVIEw.vIEw.window)func keyboarDWillShow(_ notification: Notification) { keyboarDWillShow(sender: sender as NSNotification,adjustHeight: 150) print("sender - \(sender)")}
根据语言支持,这是普通的选择器
斯威夫特4
NotificationCenter.default.addobserver(self,selector: #selector(self.showKeyboard(sender:)),object: nil)var keyboardHeight = 0.0 //------------------- @objc func showKeyboard(sender: NSNotification) { keyboarDWillShow(sender: sender,adjustHeight: 150) } //------------------- func keyboarDWillShow(sender: NSNotification,adjustHeight: CGfloat) { if let keyboardSize = (sender.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue { keyboardHeight = Double(keyboardSize.height) // your operations here } }
斯威夫特3
NotificationCenter.default.addobserver(self,object: nil)var keyboardHeight = 0.0 //------------------- func showKeyboard(sender: NSNotification) { keyboarDWillShow(sender: sender,adjustHeight: 150) } //------------------- func keyboarDWillShow(sender: NSNotification,adjustHeight: CGfloat) { if let keyboardSize = (sender.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue { keyboardHeight = Double(keyboardSize.height) // your operations here } }总结
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