Question

用户名旁边的关注按钮似乎是垂直居中的，而我想对齐两个标题的基线。

我希望以编程方式对齐。

Answer 1

假设您的标签和按钮都没有固定的宽度和高度。

然后你的代码看起来就像这样。只是提到我使用LayoutAnchor很容易。

func autolayoutTitle() {
    let label = UILabel()
    label.backgroundColor = UIColor.red
    label.textColor = UIColor.white
    label.text = "Nafeez Zawahir"
    label.textAlignment = .right
    view.addSubview(label)
    label.translatesAutoresizingMaskIntoConstraints = false
    //label.widthAnchor.constraint(equalToConstant: 150).isActive = true
   // label.heightAnchor.constraint(equalToConstant: 40).isActive = true
    label.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 40).isActive = true
    label.topAnchor.constraint(equalTo: view.topAnchor, constant: 100).isActive = true

    let button = UIButton()
    //button.titleLabel?.text = "Follow"
    button.setTitle("Follow", for: .normal)
    button.setTitleColor(UIColor.white, for: .normal)
    button.backgroundColor = UIColor.darkGray
    view.addSubview(button)
    button.translatesAutoresizingMaskIntoConstraints = false
   // button.widthAnchor.constraint(equalToConstant: 100).isActive = true
   // button.heightAnchor.constraint(equalToConstant: 50).isActive = true
    button.leftAnchor.constraint(equalTo: label.rightAnchor, constant: 2).isActive = true


    button.lastBaselineAnchor.constraint(equalTo: label.lastBaselineAnchor).isActive = true
   // button.lastBaselineAnchor.constraint(equalTo: label.lastBaselineAnchor, constant: -10).isActive = true


}

输出是：

但是，如果您的标签以及按钮也固定了宽度和高度，那么您必须调整按钮的基线锚定使用标签的基线锚点，这取决于标签的高度。

假设你有这样的标签高度40。

label.heightAnchor.constraint(equalToConstant: 40).isActive = true

然后你的按钮的基线锚定应该是这样的。

button.lastBaselineAnchor.constraint(equalTo: label.lastBaselineAnchor, constant: -10).isActive = true

以下是代码：

func autolayoutTitle() {
        let label = UILabel()
        label.backgroundColor = UIColor.red
        label.textColor = UIColor.white
        label.text = "Nafeez Zawahir"
        label.textAlignment = .right
        view.addSubview(label)
        label.translatesAutoresizingMaskIntoConstraints = false
        label.widthAnchor.constraint(equalToConstant: 150).isActive = true
        label.heightAnchor.constraint(equalToConstant: 40).isActive = true
        label.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 40).isActive = true
        label.topAnchor.constraint(equalTo: view.topAnchor, constant: 100).isActive = true

        let button = UIButton()
        //button.titleLabel?.text = "Follow"
        button.setTitle("Follow", for: .normal)
        button.setTitleColor(UIColor.white, for: .normal)
        button.backgroundColor = UIColor.darkGray
        view.addSubview(button)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.widthAnchor.constraint(equalToConstant: 100).isActive = true
        button.heightAnchor.constraint(equalToConstant: 50).isActive = true
        button.leftAnchor.constraint(equalTo: label.rightAnchor, constant: 2).isActive = true


       // button.lastBaselineAnchor.constraint(equalTo: label.lastBaselineAnchor).isActive = true
        button.lastBaselineAnchor.constraint(equalTo: label.lastBaselineAnchor, constant: -10).isActive = true


    }

这是输出：

如何垂直对齐具有不同标题大小的两个不同按钮的标题？

1 个答案: