ios - 自动布局调整 UIView 大小不起作用

Question

我正在尝试将 UIView courseView 设置为自动布局。我想让 UIView 的比例保持并填充，直到最外层边缘距 super View 边缘 15 点。由于某种原因，courseView 填充了整个 super View (减去 15 个点)并且不会调整大小以适应。所以有些内容没有显示并被切断。

    self.view.addSubview(courseView!)

    let aspectConstraint = NSLayoutConstraint(item: courseView,
        attribute: .Height,
        relatedBy: .Equal,
        toItem: courseView,
        attribute: .Width,
        multiplier: courseView.frame.size.height / courseView.frame.size.width,
        constant: 0.0)
    aspectConstraint.active = true

    let topConstraint = courseView.topAnchor.constraintGreaterThanOrEqualToAnchor(topLayoutGuide.bottomAnchor, constant: 15)
    topConstraint.active = true
    let leadingConstraint = courseView.leadingAnchor.constraintLessThanOrEqualToAnchor(view.leadingAnchor, constant: 15)
    leadingConstraint.active = true
    let trailingConstraint = courseView.trailingAnchor.constraintGreaterThanOrEqualToAnchor(view.trailingAnchor, constant: -15)
    trailingConstraint.active = true
    let bottomConstraint = courseView.bottomAnchor.constraintLessThanOrEqualToAnchor(view.bottomAnchor, constant: -15)
    bottomConstraint.active = true

有什么想法吗？谢谢!

Answer 1

只需在添加约束之前禁用translatesAutoresizingMaskIntoConstraints，它应该可以正常工作。

courseView.translatesAutoresizingMaskIntoConstraints = false;

顺便说一句，你不需要aspectConstraint，因为这很可能会打破约束(当我尝试时，它对我来说是这样)。