...

// set the button 50 points to the left (-) of the horizontal center

var dotCenterXConstraint = NSLayoutConstraint(item: dotButton, attribute: .CenterX, relatedBy: .Equal, toItem: view, attribute: .CenterX, multiplier: 1.0, constant: -50)

view.addConstraints([dashCenterXConstraint, dashCenterYConstraint])

回删
当被按下时，这个删除按钮会通过，使用删除字符 。这个布局约束会和对称(.Left -> .Right, .->.Top)

1. func addDelete() {
2. deleteButton = UIButton.buttonWithType(.System) as UIButton
3. deleteButton.setTitle(" Delete ", forState: .Normal)
4. deleteButton.sizeToFit()
5. deleteButton.setTranslatesAutoresizingMaskIntoConstraints(false)
6. deleteButton.addTarget(self, action: "didTapDelete", forControlEvents: .TouchUpInside)
8. deleteButton.backgroundColor = UIColor(white: 0.9, alpha: 1)
9. deleteButton.layer.cornerRadius = 5
11. view.addSubview(deleteButton)
13. var rightSideConstraint = NSLayoutConstraint(item: deleteButton, attribute: .Right, relatedBy: .Equal, toItem: view, attribute: .Right, multiplier: 1.0, constant: -10.0)
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