如何解决#selector(delete(_:)) 在 uitextfield swift 中崩溃
每当我在 uitextfield
中输入任何文本并长按该文本并选择 delete
时,它就会崩溃。崩溃时,它显示“由于未捕获的异常'NSInvalidArgumentException'而终止应用程序,原因:'-[App_Name.HomeVC delete:]: unrecognized selector sent to instance 0x14e18ba00'”。我如何解决这个崩溃问题。下面是快速代码。
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)
}
}
解决方法
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)
}
}
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