Question

我正在尝试解决此问题，但我不知道该怎么做。我有一个视图控制器，其中有一个视图（CanvasView）和三个按钮。每个按钮绘制一种形状。我希望用户单击按钮时仅在单击按钮时才在CanvasView的特定点上单击添加形状。

是否只有在单击按钮时才允许tapGesture？

这是代码：

@IBOutlet weak var CanvasView: CanvasView!

override func viewDidLoad() {
    super.viewDidLoad()

    let tapGR = UITapGestureRecognizer(target: self, action: #selector(tap(_:)))
    tapGR.numberOfTapsRequired = 2
    CanvasView.isUserInteractionEnabled = true
    CanvasView.addGestureRecognizer(tapGR)
}

@IBAction func tap(_ sender: UITapGestureRecognizer) {
    let tapPoint = sender.location(in: CanvasView)
    let shapeView = ShapeSquare(origin: tapPoint)
    CanvasView.addSubview(shapeView)
}

@IBAction func DrawSquare(_ sender: UIButton) {
    CanvasView.setNeedsDisplay()
}

Answer 1

保持禁用手势，直到轻击按钮。

首先将手势设为属性：

var tapGR: UITapGestureRecognizer!

然后更新viewDidLoad：

tapGR = UITapGestureRecognizer(target: self, action: #selector(tap(_:)))
tapGR.isEnabled = false

然后在您的按钮处理程序中：

tapGR.isEnabled = true

Swift UIButton动作和GestureRecognizer

1 个答案: