如何在 swift 中给 UILabel 添加下划线？
How to underline a UILabel in swift?
如何在Swift中加下划线UILabel？我搜索了 Objective-C 个，但无法完全让它们在 Swift 中工作。
您可以使用 NSAttributedString
示例：
let underlineAttribute = [NSAttributedString.Key.underlineStyle: NSUnderlineStyle.thick.rawValue]
let underlineAttributedString = NSAttributedString(string: "StringWithUnderLine", attributes: underlineAttribute)
myLabel.attributedText = underlineAttributedString
编辑
要使一个 UILabel 的所有文本具有相同的属性，我建议您将 UILabel 子类化并覆盖文本，如下所示：
Swift 5
与 Swift 4.2 相同，但是： 你应该更喜欢 Swift 初始值设定项 NSRange 而不是旧的 NSMakeRange，你可以缩短为 .underlineStyle 并且换行符提高了长方法调用的可读性。
class UnderlinedLabel: UILabel {
override var text: String? {
didSet {
guard let text = text else { return }
let textRange = NSRange(location: 0, length: text.count)
let attributedText = NSMutableAttributedString(string: text)
attributedText.addAttribute(.underlineStyle,
value: NSUnderlineStyle.single.rawValue,
range: textRange)
// Add other attributes if needed
self.attributedText = attributedText
}
}
}
Swift 4.2
class UnderlinedLabel: UILabel {
override var text: String? {
didSet {
guard let text = text else { return }
let textRange = NSMakeRange(0, text.count)
let attributedText = NSMutableAttributedString(string: text)
attributedText.addAttribute(NSAttributedString.Key.underlineStyle , value: NSUnderlineStyle.single.rawValue, range: textRange)
// Add other attributes if needed
self.attributedText = attributedText
}
}
}
Swift 3.0
class UnderlinedLabel: UILabel {
override var text: String? {
didSet {
guard let text = text else { return }
let textRange = NSMakeRange(0, text.characters.count)
let attributedText = NSMutableAttributedString(string: text)
attributedText.addAttribute(NSUnderlineStyleAttributeName , value: NSUnderlineStyle.styleSingle.rawValue, range: textRange)
// Add other attributes if needed
self.attributedText = attributedText
}
}
}
你把你的文字写成这样:
@IBOutlet weak var label: UnderlinedLabel!
override func viewDidLoad() {
super.viewDidLoad()
label.text = "StringWithUnderLine"
}
旧：
Swift（2.0 到 2.3）：
class UnderlinedLabel: UILabel {
override var text: String? {
didSet {
guard let text = text else { return }
let textRange = NSMakeRange(0, text.characters.count)
let attributedText = NSMutableAttributedString(string: text)
attributedText.addAttribute(NSUnderlineStyleAttributeName, value:NSUnderlineStyle.StyleSingle.rawValue, range: textRange)
// Add other attributes if needed
self.attributedText = attributedText
}
}
}
Swift 1.2:
class UnderlinedLabel: UILabel {
override var text: String! {
didSet {
let textRange = NSMakeRange(0, count(text))
let attributedText = NSMutableAttributedString(string: text)
attributedText.addAttribute(NSUnderlineStyleAttributeName, value:NSUnderlineStyle.StyleSingle.rawValue, range: textRange)
// Add other attributes if needed
self.attributedText = attributedText
}
}
}
您可以使用 Interface Builder 为 UILabel 文本添加下划线。
这是我的回答 link：
Swift 5 & 4.2 一班:
label.attributedText = NSAttributedString(string: "Text", attributes:
[.underlineStyle: NSUnderlineStyle.single.rawValue])
Swift 4个一班:
label.attributedText = NSAttributedString(string: "Text", attributes:
[.underlineStyle: NSUnderlineStyle.styleSingle.rawValue])
Swift 3个班轮:
label.attributedText = NSAttributedString(string: "Text", attributes:
[NSUnderlineStyleAttributeName: NSUnderlineStyle.styleSingle.rawValue])
如果您正在寻找一种无需继承的方法：
Swift 5
extension UILabel {
func underline() {
if let textString = self.text {
let attributedString = NSMutableAttributedString(string: textString)
attributedString.addAttribute(NSAttributedString.Key.underlineStyle,
value: NSUnderlineStyle.single.rawValue,
range: NSRange(location: 0, length: attributedString.length))
attributedText = attributedString
}
}
}
Swift 3/4
// in swift 4 - switch NSUnderlineStyleAttributeName with NSAttributedStringKey.underlineStyle
extension UILabel {
func underline() {
if let textString = self.text {
let attributedString = NSMutableAttributedString(string: textString)
attributedString.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.styleSingle.rawValue, range: NSRange(location: 0, length: attributedString.length))
attributedText = attributedString
}
}
}
extension UIButton {
func underline() {
let attributedString = NSMutableAttributedString(string: (self.titleLabel?.text!)!)
attributedString.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.styleSingle.rawValue, range: NSRange(location: 0, length: (self.titleLabel?.text!.characters.count)!))
self.setAttributedTitle(attributedString, for: .normal)
}
}
Swift 4 变化。
请记住使用 NSUnderlineStyle.styleSingle.rawValue 而不是 NSUnderlineStyle.styleSingle。
'let attributedString = NSAttributedString(string: "Testing")
let textRange = NSMakeRange(0, attributedString.length)
let underlinedMessage = NSMutableAttributedString(attributedString: attributedString)
underlinedMessage.addAttribute(NSAttributedStringKey.underlineStyle,
value:NSUnderlineStyle.styleSingle.rawValue,
range: textRange)
label.attributedText = underlinedMessage
`
上面的答案导致我的构建环境出错。
这在 Swift 4.0 中不起作用：
attributedText.addAttribute(NSUnderlineStyleAttributeName,
value: NSUnderlineStyle.styleSingle.rawValue,
range: textRange)
试试这个：
attributedText.addAttribute(NSAttributedStringKey.underlineStyle,
value: NSUnderlineStyle.styleSingle.rawValue,
range: textRange)
希望这对某人有所帮助。
对 Swift 4 和 Xcode 9.[= 中的 Shlome 答案稍作修正11=]
extension UILabel {
func underline() {
if let textString = self.text {
let attributedString = NSMutableAttributedString(string: textString)
attributedString.addAttribute(NSAttributedStringKey.underlineStyle,
value: NSUnderlineStyle.styleSingle.rawValue,
range: NSRange(location: 0, length: attributedString.length - 1))
attributedText = attributedString
}
}
}
extension UIButton {
func underline() {
let attributedString = NSMutableAttributedString(string: (self.titleLabel?.text!)!)
attributedString.addAttribute(NSAttributedStringKey.underlineStyle,
value: NSUnderlineStyle.styleSingle.rawValue,
range: NSRange(location: 0, length: (self.titleLabel?.text!.count)!))
self.setAttributedTitle(attributedString, for: .normal)
}
}
对于Swift 2.3
extension UIButton {
func underline() {
let attributedString = NSMutableAttributedString(string: (self.titleLabel?.text!)!)
attributedString.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.StyleSingle.rawValue, range: NSRange(location: 0, length: (self.titleLabel?.text!.characters.count)!))
self.setAttributedTitle(attributedString, forState: .Normal)
}
}
并在 ViewController
@IBOutlet var yourButton: UIButton!
在 ViewDidLoad 方法中或者在你的函数中只写
yourButton.underline()
它将在您的按钮标题下划线
// Swift 4 版本
let attributedString = NSMutableAttributedString(string: "Your Text Here", attributes: [NSAttributedStringKey.underlineStyle : true])
self.yourlabel.attributedText = attributedString
Swift 5:
1- 创建 字符串扩展以获取 attributedText
extension String {
var underLined: NSAttributedString {
NSMutableAttributedString(string: self, attributes: [.underlineStyle: NSUnderlineStyle.single.rawValue])
}
}
2- 使用它
在按钮上：
<#YourButton#>.setAttributedTitle(<#YourButtonTitle#>.underLined, for: .normal)
在标签上：
<#YourLabel#>.attributedText = <#YourLabelTitle#>.underLined
或
Swift 4.2
中的相同答案
对于UILable
extension UILabel {
func underline() {
if let textString = self.text {
let attributedString = NSMutableAttributedString(string: textString)
attributedString.addAttribute(NSAttributedString.Key.underlineStyle,
value: NSUnderlineStyle.single.rawValue,
range: NSRange(location: 0, length: textString.count))
self.attributedText = attributedString
}
}
}
调用 UILabel 如下所示
myLable.underline()
对于UIButton
extension UIButton {
func underline() {
if let textString = self.titleLabel?.text {
let attributedString = NSMutableAttributedString(string: textString)
attributedString.addAttribute(NSAttributedString.Key.underlineStyle,
value: NSUnderlineStyle.single.rawValue,
range: NSRange(location: 0, length: textString.count))
self.setAttributedTitle(attributedString, for: .normal)
}
}
}
调用 UIButton 如下所示
myButton.underline()
我查看了上面的答案，其中一些是强制展开 text 值。我建议通过安全展开来获得价值。这将避免在 nil 值的情况下崩溃。
希望这有帮助:)
在一个句子中的多个字符串下划线。
extension UILabel {
func underlineMyText(range1:String, range2:String) {
if let textString = self.text {
let str = NSString(string: textString)
let firstRange = str.range(of: range1)
let secRange = str.range(of: range2)
let attributedString = NSMutableAttributedString(string: textString)
attributedString.addAttribute(NSAttributedString.Key.underlineStyle, value: NSUnderlineStyle.single.rawValue, range: firstRange)
attributedString.addAttribute(NSAttributedString.Key.underlineStyle, value: NSUnderlineStyle.single.rawValue, range: secRange)
attributedText = attributedString
}
}
}
这样使用。
lbl.text = "By continuing you agree to our Terms of Service and Privacy Policy."
lbl.underlineMyText(range1: "Terms of Service", range2: "Privacy Policy.")
如果你只想实现标签的一半作为下划线，你也可以使用它：- //For Swift 4.0+
let attributesForUnderLine: [NSAttributedString.Key: Any] = [
.font: UIFont(name: AppFont.sourceSansPro_Regular, size: 12) ?? UIFont.systemFont(ofSize: 11),
.foregroundColor: UIColor.blue,
.underlineStyle: NSUnderlineStyle.single.rawValue]
let attributesForNormalText: [NSAttributedString.Key: Any] = [
.font: UIFont(name: AppFont.sourceSansPro_Regular, size: 12) ?? UIFont.systemFont(ofSize: 11),
.foregroundColor: AppColors.ColorText_787878]
let textToSet = "Want to change your preferences? Edit Now"
let rangeOfUnderLine = (textToSet as NSString).range(of: "Edit Now")
let rangeOfNormalText = (textToSet as NSString).range(of: "Want to change your preferences?")
let attributedText = NSMutableAttributedString(string: textToSet)
attributedText.addAttributes(attributesForUnderLine, range: rangeOfUnderLine)
attributedText.addAttributes(attributesForNormalText, range: rangeOfNormalText)
yourLabel.attributedText = attributedText
Swift 4、4.2 和 5.
@IBOutlet weak var lblUnderLine: UILabel!
我需要在 UILabel 中为特定文本加下划线。因此，找到范围并设置属性。
let strSignup = "Don't have account? SIGNUP NOW."
let rangeSignUp = NSString(string: strSignup).range(of: "SIGNUP NOW.", options: String.CompareOptions.caseInsensitive)
let rangeFull = NSString(string: strSignup).range(of: strSignup, options: String.CompareOptions.caseInsensitive)
let attrStr = NSMutableAttributedString.init(string:strSignup)
attrStr.addAttributes([NSAttributedString.Key.foregroundColor : UIColor.white,
NSAttributedString.Key.font : UIFont.init(name: "Helvetica", size: 17)! as Any],range: rangeFull)
attrStr.addAttributes([NSAttributedString.Key.foregroundColor : UIColor.white,
NSAttributedString.Key.font : UIFont.init(name: "Helvetica", size: 20)!,
NSAttributedString.Key.underlineStyle: NSUnderlineStyle.thick.rawValue as Any],range: rangeSignUp) // for swift 4 -> Change thick to styleThick
lblUnderLine.attributedText = attrStr
输出
A class 为 Swift 5 的 UI 按钮设置和删除下划线。希望这对您有所帮助
import Foundation
import UIKit
class UiUtil {
static let underlineThickness = 2
class func removeUnderlineFromButton( _ button:UIButton ) {
if let str = button.titleLabel?.attributedText {
let attributedString = NSMutableAttributedString( attributedString: str )
attributedString.removeAttribute(.underlineStyle, range:
NSRange.init(location: 0, length: attributedString.length))
button.setAttributedTitle(attributedString, for: .normal)
}
}
class func setUnderlineFromButton( _ button:UIButton ) {
if let str = button.titleLabel?.attributedText {
let attributedStringUnderline = NSMutableAttributedString( attributedString:
str )
attributedStringUnderline.addAttribute(
NSAttributedString.Key.underlineStyle,
value: underlineThickness,
range: NSRange.init(location: 0, length: attributedStringUnderline.length)
)
button.setAttributedTitle(attributedStringUnderline, for: .normal)
}
}
}
我有在我的应用程序中使用的算法。在此算法中，即使在单词
之间具有 space 的子字符串也可以在子字符串下划线
extension NSMutableAttributedString{
static func findSubStringAndUnderlineIt(subStringToBeFound : String,totalString : String)-> NSMutableAttributedString?{
let attributedString = NSMutableAttributedString(string: totalString)
var spaceCount = 0
if subStringToBeFound.contains(" "){
spaceCount = subStringToBeFound.components(separatedBy:" ").count-1
}
if let range = attributedString.string.range(of: subStringToBeFound, options: .caseInsensitive){
attributedString.addAttribute(NSAttributedString.Key.underlineStyle, value: NSUnderlineStyle.single.rawValue, range: NSMakeRange((range.lowerBound.utf16Offset(in: subStringToBeFound)) ,(range.upperBound.utf16Offset(in: subStringToBeFound)) +
spaceCount))
return attributedString
}
return attributedString
}
}
在已使用部分
lblWarning.attributedText = NSMutableAttributedString.findSubStringAndUnderlineIt(subStringToBeFound:"Not: Sadece uygulamanın reklamları kaldırılacaktır.", totalString: lblWarning.text!)
如何在Swift中加下划线UILabel？我搜索了 Objective-C 个，但无法完全让它们在 Swift 中工作。
您可以使用 NSAttributedString
示例：
let underlineAttribute = [NSAttributedString.Key.underlineStyle: NSUnderlineStyle.thick.rawValue]
let underlineAttributedString = NSAttributedString(string: "StringWithUnderLine", attributes: underlineAttribute)
myLabel.attributedText = underlineAttributedString
编辑
要使一个 UILabel 的所有文本具有相同的属性，我建议您将 UILabel 子类化并覆盖文本，如下所示：
Swift 5
与 Swift 4.2 相同，但是： 你应该更喜欢 Swift 初始值设定项 NSRange 而不是旧的 NSMakeRange，你可以缩短为 .underlineStyle 并且换行符提高了长方法调用的可读性。
class UnderlinedLabel: UILabel {
override var text: String? {
didSet {
guard let text = text else { return }
let textRange = NSRange(location: 0, length: text.count)
let attributedText = NSMutableAttributedString(string: text)
attributedText.addAttribute(.underlineStyle,
value: NSUnderlineStyle.single.rawValue,
range: textRange)
// Add other attributes if needed
self.attributedText = attributedText
}
}
}
Swift 4.2
class UnderlinedLabel: UILabel {
override var text: String? {
didSet {
guard let text = text else { return }
let textRange = NSMakeRange(0, text.count)
let attributedText = NSMutableAttributedString(string: text)
attributedText.addAttribute(NSAttributedString.Key.underlineStyle , value: NSUnderlineStyle.single.rawValue, range: textRange)
// Add other attributes if needed
self.attributedText = attributedText
}
}
}
Swift 3.0
class UnderlinedLabel: UILabel {
override var text: String? {
didSet {
guard let text = text else { return }
let textRange = NSMakeRange(0, text.characters.count)
let attributedText = NSMutableAttributedString(string: text)
attributedText.addAttribute(NSUnderlineStyleAttributeName , value: NSUnderlineStyle.styleSingle.rawValue, range: textRange)
// Add other attributes if needed
self.attributedText = attributedText
}
}
}
你把你的文字写成这样:
@IBOutlet weak var label: UnderlinedLabel!
override func viewDidLoad() {
super.viewDidLoad()
label.text = "StringWithUnderLine"
}
旧：
Swift（2.0 到 2.3）：
class UnderlinedLabel: UILabel {
override var text: String? {
didSet {
guard let text = text else { return }
let textRange = NSMakeRange(0, text.characters.count)
let attributedText = NSMutableAttributedString(string: text)
attributedText.addAttribute(NSUnderlineStyleAttributeName, value:NSUnderlineStyle.StyleSingle.rawValue, range: textRange)
// Add other attributes if needed
self.attributedText = attributedText
}
}
}
Swift 1.2:
class UnderlinedLabel: UILabel {
override var text: String! {
didSet {
let textRange = NSMakeRange(0, count(text))
let attributedText = NSMutableAttributedString(string: text)
attributedText.addAttribute(NSUnderlineStyleAttributeName, value:NSUnderlineStyle.StyleSingle.rawValue, range: textRange)
// Add other attributes if needed
self.attributedText = attributedText
}
}
}
您可以使用 Interface Builder 为 UILabel 文本添加下划线。
这是我的回答 link：
Swift 5 & 4.2 一班:
label.attributedText = NSAttributedString(string: "Text", attributes:
[.underlineStyle: NSUnderlineStyle.single.rawValue])
Swift 4个一班:
label.attributedText = NSAttributedString(string: "Text", attributes:
[.underlineStyle: NSUnderlineStyle.styleSingle.rawValue])
Swift 3个班轮:
label.attributedText = NSAttributedString(string: "Text", attributes:
[NSUnderlineStyleAttributeName: NSUnderlineStyle.styleSingle.rawValue])
如果您正在寻找一种无需继承的方法：
Swift 5
extension UILabel {
func underline() {
if let textString = self.text {
let attributedString = NSMutableAttributedString(string: textString)
attributedString.addAttribute(NSAttributedString.Key.underlineStyle,
value: NSUnderlineStyle.single.rawValue,
range: NSRange(location: 0, length: attributedString.length))
attributedText = attributedString
}
}
}
Swift 3/4
// in swift 4 - switch NSUnderlineStyleAttributeName with NSAttributedStringKey.underlineStyle
extension UILabel {
func underline() {
if let textString = self.text {
let attributedString = NSMutableAttributedString(string: textString)
attributedString.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.styleSingle.rawValue, range: NSRange(location: 0, length: attributedString.length))
attributedText = attributedString
}
}
}
extension UIButton {
func underline() {
let attributedString = NSMutableAttributedString(string: (self.titleLabel?.text!)!)
attributedString.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.styleSingle.rawValue, range: NSRange(location: 0, length: (self.titleLabel?.text!.characters.count)!))
self.setAttributedTitle(attributedString, for: .normal)
}
}
Swift 4 变化。 请记住使用 NSUnderlineStyle.styleSingle.rawValue 而不是 NSUnderlineStyle.styleSingle。
'let attributedString = NSAttributedString(string: "Testing")
let textRange = NSMakeRange(0, attributedString.length)
let underlinedMessage = NSMutableAttributedString(attributedString: attributedString)
underlinedMessage.addAttribute(NSAttributedStringKey.underlineStyle,
value:NSUnderlineStyle.styleSingle.rawValue,
range: textRange)
label.attributedText = underlinedMessage
`
上面的答案导致我的构建环境出错。
这在 Swift 4.0 中不起作用：
attributedText.addAttribute(NSUnderlineStyleAttributeName,
value: NSUnderlineStyle.styleSingle.rawValue,
range: textRange)
试试这个：
attributedText.addAttribute(NSAttributedStringKey.underlineStyle,
value: NSUnderlineStyle.styleSingle.rawValue,
range: textRange)
希望这对某人有所帮助。
对 Swift 4 和 Xcode 9.[= 中的 Shlome 答案稍作修正11=]
extension UILabel {
func underline() {
if let textString = self.text {
let attributedString = NSMutableAttributedString(string: textString)
attributedString.addAttribute(NSAttributedStringKey.underlineStyle,
value: NSUnderlineStyle.styleSingle.rawValue,
range: NSRange(location: 0, length: attributedString.length - 1))
attributedText = attributedString
}
}
}
extension UIButton {
func underline() {
let attributedString = NSMutableAttributedString(string: (self.titleLabel?.text!)!)
attributedString.addAttribute(NSAttributedStringKey.underlineStyle,
value: NSUnderlineStyle.styleSingle.rawValue,
range: NSRange(location: 0, length: (self.titleLabel?.text!.count)!))
self.setAttributedTitle(attributedString, for: .normal)
}
}
对于Swift 2.3
extension UIButton {
func underline() {
let attributedString = NSMutableAttributedString(string: (self.titleLabel?.text!)!)
attributedString.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.StyleSingle.rawValue, range: NSRange(location: 0, length: (self.titleLabel?.text!.characters.count)!))
self.setAttributedTitle(attributedString, forState: .Normal)
}
}
并在 ViewController
@IBOutlet var yourButton: UIButton!
在 ViewDidLoad 方法中或者在你的函数中只写
yourButton.underline()
它将在您的按钮标题下划线
// Swift 4 版本
let attributedString = NSMutableAttributedString(string: "Your Text Here", attributes: [NSAttributedStringKey.underlineStyle : true])
self.yourlabel.attributedText = attributedString
Swift 5:
1- 创建 字符串扩展以获取 attributedText
extension String {
var underLined: NSAttributedString {
NSMutableAttributedString(string: self, attributes: [.underlineStyle: NSUnderlineStyle.single.rawValue])
}
}
2- 使用它
在按钮上：
<#YourButton#>.setAttributedTitle(<#YourButtonTitle#>.underLined, for: .normal)
在标签上：
<#YourLabel#>.attributedText = <#YourLabelTitle#>.underLined
或
Swift 4.2
中的相同答案对于UILable
extension UILabel {
func underline() {
if let textString = self.text {
let attributedString = NSMutableAttributedString(string: textString)
attributedString.addAttribute(NSAttributedString.Key.underlineStyle,
value: NSUnderlineStyle.single.rawValue,
range: NSRange(location: 0, length: textString.count))
self.attributedText = attributedString
}
}
}
调用 UILabel 如下所示
myLable.underline()
对于UIButton
extension UIButton {
func underline() {
if let textString = self.titleLabel?.text {
let attributedString = NSMutableAttributedString(string: textString)
attributedString.addAttribute(NSAttributedString.Key.underlineStyle,
value: NSUnderlineStyle.single.rawValue,
range: NSRange(location: 0, length: textString.count))
self.setAttributedTitle(attributedString, for: .normal)
}
}
}
调用 UIButton 如下所示
myButton.underline()
我查看了上面的答案，其中一些是强制展开 text 值。我建议通过安全展开来获得价值。这将避免在 nil 值的情况下崩溃。 希望这有帮助:)
在一个句子中的多个字符串下划线。
extension UILabel {
func underlineMyText(range1:String, range2:String) {
if let textString = self.text {
let str = NSString(string: textString)
let firstRange = str.range(of: range1)
let secRange = str.range(of: range2)
let attributedString = NSMutableAttributedString(string: textString)
attributedString.addAttribute(NSAttributedString.Key.underlineStyle, value: NSUnderlineStyle.single.rawValue, range: firstRange)
attributedString.addAttribute(NSAttributedString.Key.underlineStyle, value: NSUnderlineStyle.single.rawValue, range: secRange)
attributedText = attributedString
}
}
}
这样使用。
lbl.text = "By continuing you agree to our Terms of Service and Privacy Policy."
lbl.underlineMyText(range1: "Terms of Service", range2: "Privacy Policy.")
如果你只想实现标签的一半作为下划线，你也可以使用它：- //For Swift 4.0+
let attributesForUnderLine: [NSAttributedString.Key: Any] = [
.font: UIFont(name: AppFont.sourceSansPro_Regular, size: 12) ?? UIFont.systemFont(ofSize: 11),
.foregroundColor: UIColor.blue,
.underlineStyle: NSUnderlineStyle.single.rawValue]
let attributesForNormalText: [NSAttributedString.Key: Any] = [
.font: UIFont(name: AppFont.sourceSansPro_Regular, size: 12) ?? UIFont.systemFont(ofSize: 11),
.foregroundColor: AppColors.ColorText_787878]
let textToSet = "Want to change your preferences? Edit Now"
let rangeOfUnderLine = (textToSet as NSString).range(of: "Edit Now")
let rangeOfNormalText = (textToSet as NSString).range(of: "Want to change your preferences?")
let attributedText = NSMutableAttributedString(string: textToSet)
attributedText.addAttributes(attributesForUnderLine, range: rangeOfUnderLine)
attributedText.addAttributes(attributesForNormalText, range: rangeOfNormalText)
yourLabel.attributedText = attributedText
Swift 4、4.2 和 5.
@IBOutlet weak var lblUnderLine: UILabel!
我需要在 UILabel 中为特定文本加下划线。因此，找到范围并设置属性。
let strSignup = "Don't have account? SIGNUP NOW."
let rangeSignUp = NSString(string: strSignup).range(of: "SIGNUP NOW.", options: String.CompareOptions.caseInsensitive)
let rangeFull = NSString(string: strSignup).range(of: strSignup, options: String.CompareOptions.caseInsensitive)
let attrStr = NSMutableAttributedString.init(string:strSignup)
attrStr.addAttributes([NSAttributedString.Key.foregroundColor : UIColor.white,
NSAttributedString.Key.font : UIFont.init(name: "Helvetica", size: 17)! as Any],range: rangeFull)
attrStr.addAttributes([NSAttributedString.Key.foregroundColor : UIColor.white,
NSAttributedString.Key.font : UIFont.init(name: "Helvetica", size: 20)!,
NSAttributedString.Key.underlineStyle: NSUnderlineStyle.thick.rawValue as Any],range: rangeSignUp) // for swift 4 -> Change thick to styleThick
lblUnderLine.attributedText = attrStr
输出
A class 为 Swift 5 的 UI 按钮设置和删除下划线。希望这对您有所帮助
import Foundation
import UIKit
class UiUtil {
static let underlineThickness = 2
class func removeUnderlineFromButton( _ button:UIButton ) {
if let str = button.titleLabel?.attributedText {
let attributedString = NSMutableAttributedString( attributedString: str )
attributedString.removeAttribute(.underlineStyle, range:
NSRange.init(location: 0, length: attributedString.length))
button.setAttributedTitle(attributedString, for: .normal)
}
}
class func setUnderlineFromButton( _ button:UIButton ) {
if let str = button.titleLabel?.attributedText {
let attributedStringUnderline = NSMutableAttributedString( attributedString:
str )
attributedStringUnderline.addAttribute(
NSAttributedString.Key.underlineStyle,
value: underlineThickness,
range: NSRange.init(location: 0, length: attributedStringUnderline.length)
)
button.setAttributedTitle(attributedStringUnderline, for: .normal)
}
}
}
我有在我的应用程序中使用的算法。在此算法中，即使在单词
之间具有 space 的子字符串也可以在子字符串下划线extension NSMutableAttributedString{
static func findSubStringAndUnderlineIt(subStringToBeFound : String,totalString : String)-> NSMutableAttributedString?{
let attributedString = NSMutableAttributedString(string: totalString)
var spaceCount = 0
if subStringToBeFound.contains(" "){
spaceCount = subStringToBeFound.components(separatedBy:" ").count-1
}
if let range = attributedString.string.range(of: subStringToBeFound, options: .caseInsensitive){
attributedString.addAttribute(NSAttributedString.Key.underlineStyle, value: NSUnderlineStyle.single.rawValue, range: NSMakeRange((range.lowerBound.utf16Offset(in: subStringToBeFound)) ,(range.upperBound.utf16Offset(in: subStringToBeFound)) +
spaceCount))
return attributedString
}
return attributedString
}
}
在已使用部分
lblWarning.attributedText = NSMutableAttributedString.findSubStringAndUnderlineIt(subStringToBeFound:"Not: Sadece uygulamanın reklamları kaldırılacaktır.", totalString: lblWarning.text!)