swift - 以编程方式在左下 View 上垂直 UISlider 约束 (Swift 4.2)

Question

我需要将垂直 slider 锚定在 View 的左下角。

这是我的代码:

let slider  = UISlider()
var constraints = [NSLayoutConstraint]()

slider.transform = CGAffineTransform(rotationAngle: CGFloat(-(Double.pi/2)))
slider.translatesAutoresizingMaskIntoConstraints = false
constraints.append(slider.widthAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.3))
constraints.append(slider.centerYAnchor.constraint(equalTo: view.centerYAnchor))
NSLayoutConstraint.activate(constraints)

Answer 1

您需要添加前导/左约束

slider.leadingAnchor.constraint(equalTo: view.leadingAnchor)