我正在尝试让UIView courseView自动布局。我想让 UIView 的比例保持不变并填满,直到最外层的边缘距离超级视图的边缘 15 点。出于某种原因,courseView 会填充整个超级视图(减去 15 个点),并且不会调整大小以适合。所以其中一些没有显示并被切断。
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!
只需在添加约束之前禁用 translatesAutoressizeMaskIntoConstraint,它应该可以正常工作。
courseView.translatesAutoresizingMaskIntoConstraints = false;
顺便说一下,你不需要 aspectConstraint,因为这很可能会破坏 constratints(当我尝试时,它对我确实如此)。