[英]How to disable an NSTextField and make it uneditable? [isEditable property not working]
我正在NSTextField中輸入促銷代碼,然后單擊“應用”就應用了促銷代碼。
此時,在按下刪除促銷代碼之前,我的文本字段應該不可編輯。 如果按下刪除促銷代碼按鈕,則文本字段將變為可編輯狀態。 就像Zomato優惠券代碼適用並刪除一樣。
我嘗試過isEditable = false,但是不起作用
@IBOutlet weak var promoCodeValidity: NSTextField!
@IBOutlet weak var promoCode: NSTextField!
func applyCoupon(){
let couponCode = promoCode.stringValue
if let offer = bookingView!.applyOffer(offerCode:couponCode){
promoCodeValidity.stringValue="Offer Applied "+String(offer)+"% Off"
promoCode.isEditable=false
}
else{
promoCodeValidity.stringValue="Offer Code Invalid"
}
}
為什么isEditable不起作用
嘗試切換文本字段的isEnabled屬性,然后更改文本字段的isEnabled屬性。 即,首先禁用文本字段,然后更改文本字段的editable屬性,然后再次啟用文本字段。 希望這能解決您的問題。 我還附了一個小代碼示例:)
class ViewController: NSViewController {
let textField = NSTextField()
let button = NSButton()
override func viewDidLoad() {
textField.translatesAutoresizingMaskIntoConstraints=false
textField.placeholderString = "ENTER PROMO CODE"
button.translatesAutoresizingMaskIntoConstraints=false
super.viewDidLoad()
textField.isEditable = true
button.action = #selector(buttonClicked(_:))
view.addSubview(textField)
view.addSubview(button)
NSLayoutConstraint(item: textField, attribute: .centerY, relatedBy: .equal, toItem: view, attribute: .centerY, multiplier: 1.0, constant: 0).isActive = true
NSLayoutConstraint(item: textField, attribute: .centerX, relatedBy: .equal, toItem: view, attribute: .centerX, multiplier: 1.0, constant: 0).isActive = true
NSLayoutConstraint(item: textField, attribute: .width, relatedBy: .equal, toItem: nil , attribute: .notAnAttribute, multiplier: 1.0, constant: 100).isActive = true
NSLayoutConstraint(item: button, attribute: .centerY, relatedBy: .equal, toItem: view, attribute: .centerY, multiplier: 1.0, constant: 0).isActive = true
NSLayoutConstraint(item: button, attribute: .leading, relatedBy: .equal, toItem: textField, attribute: .trailing, multiplier: 1.0, constant: 20).isActive = true
NSLayoutConstraint(item: button, attribute: .width, relatedBy: .equal, toItem: nil , attribute: .notAnAttribute, multiplier: 1.0, constant: 50).isActive = true
// Do any additional setup after loading the view.
}
override var representedObject: Any? {
didSet {
// Update the view, if already loaded.
}
}
@objc func buttonClicked(_ sender: Any) {
textField.isEnabled = false
textField.isEditable = false
textField.isEnabled = true
}
}
add extention:
extension UITextField
{
open override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
if action == #selector(UIResponderStandardEditActions.paste(_:)) || action == #selector(UIResponderStandardEditActions.cut(_:)) || action == #selector(UIResponderStandardEditActions.copy(_:)) || action == #selector(UIResponderStandardEditActions.select(_:)) || action == #selector(UIResponderStandardEditActions.selectAll(_:)) {
return false
}
return false
}
}
and:
textFiled.isEditable = false
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