Swift，添加带约束的按钮以编程方式查看

Question

我在tableviewCell中有一个视图，我想添加按钮并为视图添加此按钮的约束
喜欢facebook的问题

Answer 1

因为你的问题不是很明确，我只能放弃这个：

YOURVIEW.addSubview(YOURBUTTON)

iOS 9 +

YOURVIEW.addSubview(YOURBUTTON)

YOURBUTTON.translatesAutoresizingMaskIntoConstraints = false
YOURBUTTON.topAnchor.constraintEqualToAnchor(YOURVIEW.topAnchor).active = true
YOURBUTTON.bottomAnchor.constraintEqualToAnchor(YOURVIEW.bottomAnchor).active = true
YOURBUTTON.leadingAnchor.constraintEqualToAnchor(YOURVIEW.leadingAnchor).active = true       
YOURBUTTON.trailingAnchor.constraintEqualToAnchor(YOURVIEW.trailingAnchor).active = true

iOS 6 +

let view = ["yourButotn": YOURBUTTON]
addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[yourButotn]-|", options: [], metrics: nil, views: views))
addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-[yourButotn]-|", options: [], metrics: nil, views: views))

这将添加约束