Question

我有两个div标签，只有一个标签有input个标签;为什么输出是这样的？

div.logo, div.form { 
  display: inline-block;
  height: 200px;
  width: 200px;
  border: 1px dotted;
}

<div class="logo">
  <input type="text">
</div>

<div class="form">
</div>

输出：

任何人都能解释一下吗？这是小提琴：https://jsfiddle.net/ag487L5m/

Answer 1

这是因为内联元素的垂直对齐默认为基线。将其更改为顶部：

import UIKit
import PlaygroundSupport

class TestViewController : UIViewController {

    let labelOne: UILabel = {
        let label = UILabel()
        label.text = "Scroll Top"
        label.backgroundColor = .red
        label.translatesAutoresizingMaskIntoConstraints = false
        return label
    }()

    let labelTwo: UILabel = {
        let label = UILabel()
        label.text = "Scroll Bottom"
        label.backgroundColor = .green
        label.translatesAutoresizingMaskIntoConstraints = false
        return label
    }()

    let scrollView: UIScrollView = {
        let v = UIScrollView()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.backgroundColor = .cyan
        return v
    }()


    override func viewDidLoad() {
        super.viewDidLoad()

        // add the scroll view to self.view
        self.view.addSubview(scrollView)

        // constrain the scroll view to 8-pts on each side
        scrollView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 8.0).isActive = true
        scrollView.topAnchor.constraint(equalTo: view.topAnchor, constant: 8.0).isActive = true
        scrollView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -8.0).isActive = true
        scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -8.0).isActive = true

        // add labelOne to the scroll view
        scrollView.addSubview(labelOne)

        // constrain labelOne to left & top with 16-pts padding
        // this also defines the left & top of the scroll content
        labelOne.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: 16.0).isActive = true
        labelOne.topAnchor.constraint(equalTo: scrollView.topAnchor, constant: 16.0).isActive = true

        // add labelTwo to the scroll view
        scrollView.addSubview(labelTwo)

        // constrain labelTwo at 400-pts from the left
        labelTwo.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor, constant: 400.0).isActive = true

        // constrain labelTwo at 1000-pts from the top
        labelTwo.topAnchor.constraint(equalTo: scrollView.topAnchor, constant: 1000).isActive = true

        // constrain labelTwo to right & bottom with 16-pts padding
        labelTwo.rightAnchor.constraint(equalTo: scrollView.rightAnchor, constant: -16.0).isActive = true
        labelTwo.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor, constant: -16.0).isActive = true

    }

}


let vc = TestViewController()
vc.view.backgroundColor = .yellow
PlaygroundPage.current.liveView = vc

div.logo, div.form { 
  display: inline-block;
  height: 200px;
  width: 200px;
  border: 1px dotted;
  vertical-align:top;
}

div.logo, div.form { 
  display: inline-block;
  height: 200px;
  width: 200px;
  border: 1px dotted;
  vertical-align:top;
}

Answer 2

默认情况下，inline和inline-block元素设置为vertical-align: baseline。

由于您的div.logo有一个文字输入，div.form现在是inline-block元素，因此会在input的基线上对齐。

将vertical-align: top添加到CSS应修复它。如：

div.logo, div.form { 
    display: inline-block;
    height: 200px;
    width: 200px;
    border: 1px dotted;
    vertical-align: top;
}

div.logo, div.form { 
    display: inline-block;
    height: 200px;
    width: 200px;
    border: 1px dotted;
    vertical-align:top;
}

<div class="logo">
  <input type="text">
</div>

<div class="form">

</div>

内联块样式的两个div未对齐

输出：

2 个答案: