Question

我使用以下代码进行撤消重做操作。我正在更改标签的背景颜色，我的撤消/重做操作工作正常，但现在我添加了标签的文本颜色，所以每当我单独更改背景颜色或文本颜色时，它工作正常，但如果我改变背景颜色和文本颜色时间那么它将无法正常工作。我该怎么办？请帮忙。！

@IBOutlet var myObject: UILabel!

//  MARK: - View Life Cycle
override func viewDidLoad() {
    super.viewDidLoad()
    myObject.backgroundColor = UIColor.yellow
}

func setMyObjectColor(_ color: UIColor) {
        (undoManager?.prepare(withInvocationTarget: self) as AnyObject).setMyObjectColor(myObject.backgroundColor!)
        myObject.backgroundColor = color
}

func setMyObjectTextColor(_ color: UIColor) {
        (undoManager?.prepare(withInvocationTarget: self) as AnyObject).setMyObjectTextColor(myObject.textColor!)
        myObject.textColor = color
}

@IBAction func changeColor(_ sender: Any){
    setMyObjectColor(UIColor.blue)
}

@IBAction func changeTextColor(_ sender: Any){
    setMyObjectTextColor(UIColor.white)
}

@IBAction func undo(_ sender: Any) {
    undoManager?.undo()
}

@IBAction func redo(_ sender: Any) {
    undoManager?.redo()
}}

Answer 1

@IBOutlet var myObject: UILabel!

//  MARK: - View Life Cycle
override func viewDidLoad() {
    super.viewDidLoad()
    myObject.backgroundColor = UIColor.yellow
}

func setMyObjectColor(_ Backcolor: UIColor) {
        (undoManager?.prepare(withInvocationTarget: self) as AnyObject).setMyObjectColor(myObject.backgroundColor!)
        myObject.backgroundColor = Backcolor
}

func setMyObjectTextColor(_ Textcolor: UIColor) {
        (undoManager?.prepare(withInvocationTarget: self) as AnyObject).setMyObjectTextColor(myObject.textColor!)
        myObject.textColor = Textcolor
}

func setMyObjectText(_ Text: String) {
    (undoManager?.prepare(withInvocationTarget: self) as AnyObject).setMyObjectText((myObject.text! as AnyObject) as! String)
    myObject.text = Text
}

@IBAction func changeColor(_ sender: Any){
    setMyObjectColor(UIColor.blue)
}

@IBAction func changeTextColor(_ sender: Any){
    setMyObjectTextColor(UIColor.white)
}

@IBAction func changeText(_ sender: Any) {
    setMyObjectText("Khush")
}

@IBAction func undo(_ sender: Any) {
    undoManager?.undo()
}

@IBAction func redo(_ sender: Any) {
    undoManager?.redo()
}

使用此代码解决了我的问题。

撤消重做操作

1 个答案: