设置 UIView 大小以适应子视图

问题描述

我有一个 UIView，其中包含两个具有动态高度的 UILabel.我希望 UIView 适合 UILabel 的大小 + 一些填充.现在我正在绘制标签，然后将 UIView 的宽度和高度约束设置为标签的组合大小.

I'm having a UIView that's containing two UILabels, which have dynamic heights. I want the UIView to fit the size of the UILabels + some padding. Right now I'm drawing the labels and then sets the UIView's width and height constraints to the combined size of the labels.

现在我正在这样做:

func populateWithMessage(headline: String?, message: String) {
    // Sets text
    self.headerLabel.text = headline
    self.messageLabel.text = message

    self.headerLabel.sizeToFit()
    self.messageLabel.sizeToFit()

    self.layoutSubviews()

    // Finding the label with the greatest width
    var longestLabel: UILabel!
    if self.headerLabel.frame.width > self.messageLabel.frame.width {
       longestLabel = self.headerLabel
   } else {
       longestLabel = self.messageLabel
   }
   
   let combinedLabelHeight = self.headerLabel.frame.height + self.messageLabel.frame.height
   
   // Update the container view's constraints
   self.containerViewWidtConstraint.constant = longestLabel.frame.width + 10
   self.containerViewHeightConstraint.constant = combinedLabelHeight + 10

   self.updateConstraints()
}

不幸的是，它不起作用.我正在使用 Swift 2.3 和 Autolayout.

Unfortunately it doesn't work. I'm using Swift 2.3 and Autolayout.

推荐答案

您可以使用情节提要本身来完成.

You can do it using the storyboard itself.

将视图的底部约束设置为第二个 UIlabel.所以当label的高度增加时，UIView的高度也会增加.

Set the View's bottom constraint to second UIlabel. So when the height of label increases, UIView's height will also increases.

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