垂直 UISlider 以編程方式約束左下視圖 (Swift 4.2)

Question

我需要將垂直滑塊錨定在視圖的左下角。

這是我的代碼：

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

您需要添加一個前導/左約束

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