Question

我正在使用此代码在swift中创建我的按钮。它工作得很好，除了我不知道如何从代码中添加约束。

    let button   = UIButton.buttonWithType(UIButtonType.System) as UIButton
button.frame = CGRectMake(100, 100, 100, 50)
button.backgroundColor = UIColor.greenColor()
button.setTitle("Test Button", forState: UIControlState.Normal)
button.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)

self.view.addSubview(button)

我想将按钮放置在50左右，从顶部放置100。任何帮助将不胜感激。

Answer 1

试试：

    ....
    self.view.addSubview(button)

    button.setTranslatesAutoresizingMaskIntoConstraints(false)

    let views = ["button": button]

    var constraintHorizontal = NSLayoutConstraint.constraintsWithVisualFormat("H:|-50-[button]", options: NSLayoutFormatOptions(0), metrics: nil, views: views)
    view.addConstraints(constraintHorizontal)
    var constraintWertical = NSLayoutConstraint.constraintsWithVisualFormat("V:|-100-[button]", options: NSLayoutFormatOptions(0), metrics: nil, views: views)
    view.addConstraints(constraintWertical)

在swift 1.2中为编程创建的按钮添加约束

1 个答案: