获取UISlider

Question

我试图在UISlider轨道上获得特定值的X，Y位置，以便在甚至用拇指移动滑块之前就可以在该位置放置文本字段。我希望能够在轨道上放置多个文本字段，以显示该位置的值。

有人可以帮助我实现这一目标吗？

谢谢

Answer 1

let values: [Float] = [15, 30, 50, 70, 85]

for value in values {
    guard (slider.minimumValue...slider.maximumValue).contains(value) else { continue }

    let label = UILabel()
    label.text = "\(value)"

    view.addSubview(label)
    label.translatesAutoresizingMaskIntoConstraints = false

    let thumbRect = slider.thumbRect(forBounds: slider.bounds,
                                     trackRect: slider.trackRect(forBounds: slider.bounds),
                                     value: value)

    let convertedThumbRect = slider.convert(thumbRect, to: view)

    NSLayoutConstraint.activate([
        label.centerXAnchor.constraint(equalTo: view.leadingAnchor, constant: convertedThumbRect.midX),
        slider.topAnchor.constraintEqualToSystemSpacingBelow(label.bottomAnchor, multiplier: 1)
    ])
}

Answer 2

首先，您将找到UISlide拇指图像的框架。

对于UISlide缩略图图像的查找框架，请使用以下方法：-

@IBAction func sliderAction(_ sender: UISlider) {

        let _thumbRect: CGRect = sender.thumbRect(forBounds: sender.bounds, trackRect: sender.trackRect(forBounds: sender.bounds), value: sender.value)

        let thumbRect: CGRect = view.convert(_thumbRect, from: sender)

        print("thumbRect \(thumbRect)")


    }