Question

如何将数字字符串替换为数组中相应的字母字符。

virtualenv

Answer 1

您可以使用Dictionary替换规则：

let array = ["1", "2", "3", "3", "2", "3"]

let replacementRules = ["1": "A", "2": "B", "3": "C"]

let result = array.map{replacementRules[$0] ?? $0}
print(result)
//["A", "B", "C", "C", "B", "C"]

Answer 2

如果您的数组包含字符串值直到1-26，您可以尝试这样

public class HueWheel : Control
{
    static HueWheel()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(HueWheel), new FrameworkPropertyMetadata(typeof(HueWheel)));
    }
    private bool _isPressed = false;
    //private Canvas _templateCanvas = null;
    private Canvas _PART_FirstCanvas;
    private Canvas _PART_SecondCanvas;
    private Slider _PART_Slider;

    public override void OnApplyTemplate()
    {
        base.OnApplyTemplate();
        _PART_FirstCanvas = (Canvas)GetTemplateChild("PART_FirstCanvas");
        _PART_SecondCanvas = (Canvas)GetTemplateChild("PART_SecondCanvas");
        _PART_Slider = (Slider)GetTemplateChild("PART_Slider");
    }

    protected override void OnMouseMove(MouseEventArgs e)
    {
        if (_isPressed)
        {
            const double RADIUS = 150;
            Point newPos = e.GetPosition(_PART_SecondCanvas);
            double angle = MyHelper.GetAngleR(newPos, RADIUS);
            _PART_Slider.Value = (_PART_Slider.Maximum - _PART_Slider.Minimum) * angle  / (2 * Math.PI);
        }
    }

    protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
    {
        _isPressed = true;
    }

    protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
    {
        _isPressed = false;
    }
}

Answer 3

var arr = ["1","2","3","3","2","3"]
for i in 0..<arr.count {
    switch(arr[i]) {
        case "1":
            arr[i] = "A"
            break
        case "2":
            arr[i] = "B"
            break
        case "3":
            arr[i] = "C"
            break
    default: break
    }

}

替换数组根据其出现次数包含

3 个答案: