Vertical UISlider constraints programmatically on bottom left view (Swift 4.2)

Question

I need to anchor my vertical slider in the bottom left corner of my view.

This is my code:

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

您需要添加一个前导/左约束

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