ios 将 UILabel 高度调整为文本

Adjust UILabel height to text

提问by TheBurgerShot

I have some labels which I want to adjust their height to the text, this is the code I wrote for this now

我有一些标签，我想将它们的高度调整为文本，这是我现在为此编写的代码

func heightForView(text:String, font:UIFont, width:CGFloat) -> CGFloat{
    let label:UILabel = UILabel(frame: CGRectMake(0, 0, width, CGFloat.max))
    label.numberOfLines = 0
    label.lineBreakMode = NSLineBreakMode.ByWordWrapping
    label.font = font
    label.text = text

    label.sizeToFit()
    return label.frame.height
}

EDIT:

编辑：

The issue was not in this piece of code, so my fix is in the question itself. It might still be useful for others!

问题不在这段代码中，所以我的解决方法是问题本身。它可能对其他人仍然有用！

回答by Anorak

I've just put this in a playground and it works for me.

我刚刚把它放在操场上，它对我有用。

Updated for Swift 4.0

为 Swift 4.0 更新

import UIKit

 func heightForView(text:String, font:UIFont, width:CGFloat) -> CGFloat{
    let label:UILabel = UILabel(frame: CGRectMake(0, 0, width, CGFloat.greatestFiniteMagnitude))
    label.numberOfLines = 0
    label.lineBreakMode = NSLineBreakMode.byWordWrapping
    label.font = font
    label.text = text

    label.sizeToFit()
    return label.frame.height
}

let font = UIFont(name: "Helvetica", size: 20.0)

var height = heightForView("This is just a load of text", font: font, width: 100.0)

Swift 3:

斯威夫特 3：

func heightForView(text:String, font:UIFont, width:CGFloat) -> CGFloat{
    let label:UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: width, height: CGFloat.greatestFiniteMagnitude))
    label.numberOfLines = 0
    label.lineBreakMode = NSLineBreakMode.byWordWrapping
    label.font = font
    label.text = text
    label.sizeToFit()

    return label.frame.height
}

回答by Phan Van Linh

If you are using AutoLayout, you can adjust UILabelheight by config UI only.

如果您使用 AutoLayout，则UILabel只能通过配置 UI调整高度。

For iOS8 or above

iOS8 或以上

• Set constraint leading/trailing for your UILabel
• And change the lines of UILabelfrom 1 to 0

• 为您设置约束前导/尾随 UILabel
• 并将行UILabel从 1更改为 0

For iOS7

对于iOS7

• First, you need to add contains height for UILabel
• Then, modify the Relation from Equalto Greater than or Equal

• 首先，您需要添加包含高度UILabel
• 然后，将 Relation 从 修改Equal为Greater than or Equal

• Finally, change the lines of UILabelfrom 1 to 0

• 最后，将行UILabel从 1更改为 0

Your UILabelwill automatically increase height depending on the text

您UILabel将根据文本自动增加高度

回答by YannSteph

I create this extension if you want

如果你愿意，我会创建这个扩展

extension UILabel {
    func setSizeFont (sizeFont: CGFloat) {
        self.font =  UIFont(name: self.font.fontName, size: sizeFont)!
        self.sizeToFit()
    }
}

回答by dimpiax

I have strong working solution.

我有强大的工作解决方案。

in layoutSubviews:

在布局子视图中：

    _title.frame = CGRect(x: 0, y: 0, width: bounds.width, height: 0)
    _title.sizeToFit()
    _title.frame.size = _title.bounds.size

in text setter:

在文本设置器中：

    _title.text = newValue
    setNeedsLayout()

UPD.of course with this UILabel settings:

更新。当然有了这个 UILabel 设置：

    _title.lineBreakMode = .ByWordWrapping
    _title.numberOfLines = 0

回答by Jordan Amman

Just by setting:

只需通过设置：

label.numberOfLines = 0

The label automatically adjusts its height based upon the amount of text entered.

标签根据输入的文本量自动调整其高度。

回答by LeftyT

based on Anorak's answer, I also agree with Zorayr's concern, so I added a couple of lines to remove the UILabel and return only the CGFloat, I don't know if it helps since the original code doesn't add the UIabel, but it doesn't throw error, so I'm using the code below:

基于 Anorak 的回答，我也同意 Zorayr 的担忧，所以我添加了几行来删除 UILabel 并仅返回 CGFloat，我不知道它是否有帮助，因为原始代码没有添加 UIabel，但是它不会抛出错误，所以我使用下面的代码：

func heightForView(text:String, font:UIFont, width:CGFloat) -> CGFloat{

    var currHeight:CGFloat!

    let label:UILabel = UILabel(frame: CGRectMake(0, 0, width, CGFloat.max))
    label.numberOfLines = 0
    label.lineBreakMode = NSLineBreakMode.ByWordWrapping
    label.font = font
    label.text = text
    label.sizeToFit()

    currHeight = label.frame.height
    label.removeFromSuperview()

    return currHeight
}

回答by Philipp Otto

The solution suggested by Anorak as a computed property in an extension for UILabel:

Anorak 建议作为 UILabel 扩展中的计算属性的解决方案：

extension UILabel
{
var optimalHeight : CGFloat
    {
        get
        {
            let label = UILabel(frame: CGRectMake(0, 0, self.frame.width, CGFloat.max))
            label.numberOfLines = 0
            label.lineBreakMode = self.lineBreakMode
            label.font = self.font
            label.text = self.text

            label.sizeToFit()

            return label.frame.height
         }
    }
}

Usage:

用法：

self.brandModelLabel.frame.size.height = self.brandModelLabel.optimalHeight

回答by iOS

In swift 4.1 and Xcode 9.4.1

在 swift 4.1 和 Xcode 9.4.1 中

Only 3 steps

只需3步

Step 1)

第1步）

//To calculate height for label based on text size and width
func heightForView(text:String, font:UIFont, width:CGFloat) -> CGFloat {
    let label:UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: width, height: CGFloat.greatestFiniteMagnitude))
    label.numberOfLines = 0
    label.lineBreakMode = NSLineBreakMode.byWordWrapping
    label.font = font
    label.text = text

    label.sizeToFit()
    return label.frame.height
}

Step 2)

第2步）

//Call this function
let height = heightForView(text: "This is your text", font: UIFont.systemFont(ofSize: 17), width: 300)
print(height)//Output : 41.0

Step 3)

步骤 3)

//This is your label
let proNameLbl = UILabel(frame: CGRect(x: 0, y: 20, width: 300, height: height))
proNameLbl.text = "This is your text"
proNameLbl.font = UIFont.systemFont(ofSize: 17)
proNameLbl.numberOfLines = 0
proNameLbl.lineBreakMode = .byWordWrapping
infoView.addSubview(proNameLbl)

回答by Lirik

Following on @Anorak answer, i added this extension to String and sent an inset as a parameter, because a lot of times you will need a padding to your text. Anyway, maybe some you will find this usefull.

在@Anorak 回答之后，我将此扩展名添加到 String 并发送了一个插图作为参数，因为很多时候您需要对文本进行填充。无论如何，也许有些你会发现这很有用。

extension String {

    func heightForWithFont(font: UIFont, width: CGFloat, insets: UIEdgeInsets) -> CGFloat {

        let label:UILabel = UILabel(frame: CGRectMake(0, 0, width + insets.left + insets.right, CGFloat.max))
        label.numberOfLines = 0
        label.lineBreakMode = NSLineBreakMode.ByWordWrapping
        label.font = font
        label.text = self

        label.sizeToFit()
        return label.frame.height + insets.top + insets.bottom
    }
}

回答by Shubham bairagi

just call this method where you need dynamic Height for label

只需在需要动态标签高度的地方调用此方法

func getHeightforController(view: AnyObject) -> CGFloat {
    let tempView: UILabel = view as! UILabel
    var context: NSStringDrawingContext = NSStringDrawingContext()
    context.minimumScaleFactor = 0.8

    var width: CGFloat = tempView.frame.size.width

    width = ((UIScreen.mainScreen().bounds.width)/320)*width

    let size: CGSize = tempView.text!.boundingRectWithSize(CGSizeMake(width, 2000), options:NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: tempView.font], context: context).size as CGSize

    return size.height
}