每当我在UITextField中键入任何文本并长按该文本并选择Delete时，它就会崩溃。崩溃时显示“由于未捕获异常'NSInvalidArgumentException'而终止应用程序，原因：'-[App_Name.HomeVC Delete:]:无法识别的选择器发送到实例0x14E18BA00'”。我如何解决这个崩溃问题。下面是swift代码。
class HomeVC: UIViewController{
@IBOutlet weak var txtSearch: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
self.txtSearch.addTarget(self, action: #selector(self.txtChanged(_:)), for: .editingChanged)
@objc func txtChanged(_ sender : UITextField){
print(txtSearch.text!)}
}
override public func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
if action == #selector(copy(_:)) || action == #selector(paste(_:)) || action == #selector(delete(_:)) || action == #selector(cut(_:))
{
return true
} else if action == Selector(("_lookup:")) || action == Selector(("_share:")) || action == Selector(("_define:")) {
return false
}
return super.canPerformAction(action, withSender: sender)
}
}
添加删除功能：
class HomeVC: UIViewController{
@IBOutlet weak var txtSearch: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
self.txtSearch.addTarget(self, action: #selector(self.txtChanged(_:)), for: .editingChanged)
}
@objc func txtChanged(_ sender : UITextField){
print(txtSearch.text!)
}
override func delete(_ sender: Any?) {
txtSearch.text = ""
}
override public func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
if action == #selector(copy(_:)) || action == #selector(paste(_:)) || action == #selector(delete(_:)) || action == #selector(cut(_:))
{
return true
} else if action == Selector(("_lookup:")) || action == Selector(("_share:")) || action == Selector(("_define:")) {
return false
}
return super.canPerformAction(action, withSender: sender)
}
}
